Articles | Volume 2, issue 4
https://doi.org/10.5194/wcd-2-1187-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wcd-2-1187-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
07 Dec 2021
Research article |
| 07 Dec 2021
| 07 Dec 2021
Synoptic processes of winter precipitation in the Upper Indus Basin
Jean-Philippe Baudouin
CORRESPONDING AUTHOR
Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
Department of Geography, University of Cambridge, Cambridge, United Kingdom
Michael Herzog
Department of Geography, University of Cambridge, Cambridge, United Kingdom
Cameron A. Petrie
Department of Archaeology, University of Cambridge, Cambridge, United Kingdom
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Aleena M. Jaison, Lesley J. Gray, Scott M. Osprey, Jeff R. Knight, and Martin B. Andrews
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Ting-Yu Cha and Michael M. Bell
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Quentin Nicolas and William R. Boos
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Abu Bakar Siddiqui Thakur and Jai Sukhatme
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Gill M. Martin and José M. Rodríguez
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Clemens Spensberger
Weather Clim. Dynam., 5, 659–669, https://doi.org/10.5194/wcd-5-659-2024, https://doi.org/10.5194/wcd-5-659-2024, 2024
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It is well-established that variations in convection in the tropical Indo-Pacific can influence weather in far-away regions. In this idea, I argue that the main theory used to explain this influence over large distances is incomplete. I propose hypotheses that could lead the way towards a more fundamental explanation and outline a novel approach that could be used to test the hypotheses I raise. The suggested approach might be useful to address also other long-standing questions.
Richard J. Keane, Ankur Srivastava, and Gill M. Martin
Weather Clim. Dynam., 5, 671–702, https://doi.org/10.5194/wcd-5-671-2024, https://doi.org/10.5194/wcd-5-671-2024, 2024
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We evaluate the performance of two widely used models in forecasting the Indian summer monsoon, which is one of the most challenging meteorological phenomena to simulate. The work links previous studies evaluating the use of the models in weather forecasting and climate simulation, as the focus here is on seasonal forecasting, which involves intermediate timescales. As well as being important in itself, this evaluation provides insights into how errors develop in the two modelling systems.
Matthias Fischer, Peter Knippertz, Roderick van der Linden, Alexander Lemburg, Gregor Pante, Carsten Proppe, and John H. Marsham
Weather Clim. Dynam., 5, 511–536, https://doi.org/10.5194/wcd-5-511-2024, https://doi.org/10.5194/wcd-5-511-2024, 2024
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Our research enhances the understanding of the complex dynamics within the West African monsoon system by analyzing the impact of specific model parameters on its characteristics. Employing surrogate models, we identified critical factors such as the entrainment rate and the fall velocity of ice. Precise definition of these parameters in weather models could improve forecast accuracy, thus enabling better strategies to manage and reduce the impact of weather events.
Kieran M. R. Hunt
Weather Clim. Dynam., 5, 345–356, https://doi.org/10.5194/wcd-5-345-2024, https://doi.org/10.5194/wcd-5-345-2024, 2024
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This study investigates changes in weather systems that bring winter precipitation to south Asia. We find that these systems, known as western disturbances, are occurring more frequently and lasting longer into the summer months. This shift is leading to devastating floods, as happened recently in north India. By analysing 70 years of weather data, we trace this change to shifts in major air currents known as the subtropical jet. Due to climate change, such events are becoming more frequent.
William J. Dow, Christine M. McKenna, Manoj M. Joshi, Adam T. Blaker, Richard Rigby, and Amanda C. Maycock
Weather Clim. Dynam., 5, 357–367, https://doi.org/10.5194/wcd-5-357-2024, https://doi.org/10.5194/wcd-5-357-2024, 2024
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Changes to sea surface temperatures in the extratropical North Pacific are driven partly by patterns of local atmospheric circulation, such as the Aleutian Low. We show that an intensification of the Aleutian Low could contribute to small changes in temperatures across the equatorial Pacific via the initiation of two mechanisms. The effect, although significant, is unlikely to explain fully the recently observed multi-year shift of a pattern of climate variability across the wider Pacific.
Franco Molteni, Fred Kucharski, and Riccardo Farneti
Weather Clim. Dynam., 5, 293–322, https://doi.org/10.5194/wcd-5-293-2024, https://doi.org/10.5194/wcd-5-293-2024, 2024
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We describe some new features of an intermediate-complexity coupled model, including a three-layer thermodynamic ocean model suitable to explore the extratropical response to tropical ocean variability. We present results on the model climatology and show that important features of interdecadal and interannual variability are realistically simulated in a
pacemakercoupled ensemble of 70-year runs, where portions of the tropical Indo-Pacific are constrained to follow the observed variability.
Molly E. Menzel, Darryn W. Waugh, Zheng Wu, and Thomas Reichler
Weather Clim. Dynam., 5, 251–261, https://doi.org/10.5194/wcd-5-251-2024, https://doi.org/10.5194/wcd-5-251-2024, 2024
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Recent work exploring the tropical atmospheric circulation response to climate change has revealed a disconnect in the latitudinal location of two features, the subtropical jet and the Hadley cell edge. Here, we investigate if the surprising result from coupled climate model and meteorological reanalysis output is consistent across model complexity.
Julian F. Quinting, Christian M. Grams, Edmund Kar-Man Chang, Stephan Pfahl, and Heini Wernli
Weather Clim. Dynam., 5, 65–85, https://doi.org/10.5194/wcd-5-65-2024, https://doi.org/10.5194/wcd-5-65-2024, 2024
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Research in the last few decades has revealed that rapidly ascending airstreams in extratropical cyclones have an important effect on the evolution of downstream weather and predictability. In this study, we show that the occurrence of these airstreams over the North Pacific is modulated by tropical convection. Depending on the modulation, known atmospheric circulation patterns evolve quite differently, which may affect extended-range predictions in the Atlantic–European region.
Hyunju Jung, Peter Knippertz, Yvonne Ruckstuhl, Robert Redl, Tijana Janjic, and Corinna Hoose
Weather Clim. Dynam., 4, 1111–1134, https://doi.org/10.5194/wcd-4-1111-2023, https://doi.org/10.5194/wcd-4-1111-2023, 2023
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A narrow rainfall belt in the tropics is an important feature for large-scale circulations and the global water cycle. The accurate simulation of this rainfall feature has been a long-standing problem, with the reasons behind that unclear. We present a novel diagnostic tool that allows us to disentangle processes important for rainfall, which changes due to modifications in model. Using our diagnostic tool, one can potentially identify sources of uncertainty in weather and climate models.
Lina Boljka, Nour-Eddine Omrani, and Noel S. Keenlyside
Weather Clim. Dynam., 4, 1087–1109, https://doi.org/10.5194/wcd-4-1087-2023, https://doi.org/10.5194/wcd-4-1087-2023, 2023
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This study examines quasi-periodic variability in the tropical Pacific on interannual timescales and related physics using a recently developed time series analysis tool. We find that wind stress in the west Pacific and recharge–discharge of ocean heat content are likely related to each other on ~1.5–4.5-year timescales (but not on others) and dominate variability in sea surface temperatures on those timescales. This may have further implications for climate models and long-term prediction.
Sam Hardy, John Methven, Juliane Schwendike, Ben Harvey, and Mike Cullen
Weather Clim. Dynam., 4, 1019–1043, https://doi.org/10.5194/wcd-4-1019-2023, https://doi.org/10.5194/wcd-4-1019-2023, 2023
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We examine a Borneo vortex case using computer simulations and satellite observations. The vortex is identified with high humidity through the atmosphere and has heaviest rainfall on its northern flank. Simulations represent circulation and rainfall accumulation well. The low-level Borneo vortex is coupled with a higher-level wave, which moves westwards along a layer with a sharp vertical gradient in moisture. Vortex growth occurs through mechanisms usually considered outside the tropics.
Chiem van Straaten, Dim Coumou, Kirien Whan, Bart van den Hurk, and Maurice Schmeits
Weather Clim. Dynam., 4, 887–903, https://doi.org/10.5194/wcd-4-887-2023, https://doi.org/10.5194/wcd-4-887-2023, 2023
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Variability in the tropics can influence weather over Europe. This study evaluates a summertime connection between the two. It shows that strongly opposing west Pacific sea surface temperature anomalies have occurred more frequently since 1980, likely due to a combination of long-term warming in the west Pacific and the El Niño Southern Oscillation. Three to six weeks later, the distribution of hot and cold airmasses over Europe is affected.
Francis Nkrumah, Cornelia Klein, Kwesi Akumenyi Quagraine, Rebecca Berkoh-Oforiwaa, Nana Ama Browne Klutse, Patrick Essien, Gandomè Mayeul Leger Davy Quenum, and Hubert Azoda Koffi
Weather Clim. Dynam., 4, 773–788, https://doi.org/10.5194/wcd-4-773-2023, https://doi.org/10.5194/wcd-4-773-2023, 2023
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It is not yet clear which variations in broader atmospheric conditions of the West African monsoon may lead to mesoscale convective system (MCS) occurrences in southern West Africa (SWA). In this study, we identified nine different weather patterns and categorized them as dry-, transition-, or monsoon-season types using a method called self-organizing maps (SOMs). It was revealed that a warmer Sahel region can create favourable conditions for MCS formation in SWA.
Giorgia Di Capua, Dim Coumou, Bart van den Hurk, Antje Weisheimer, Andrew G. Turner, and Reik V. Donner
Weather Clim. Dynam., 4, 701–723, https://doi.org/10.5194/wcd-4-701-2023, https://doi.org/10.5194/wcd-4-701-2023, 2023
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Heavy rainfall in tropical regions interacts with mid-latitude circulation patterns, and this interaction can explain weather patterns in the Northern Hemisphere during summer. In this analysis we detect these tropical–extratropical interaction pattern both in observational datasets and data obtained by atmospheric models and assess how well atmospheric models can reproduce the observed patterns. We find a good agreement although these relationships are weaker in model data.
Daniel Baldassare, Thomas Reichler, Piret Plink-Björklund, and Jacob Slawson
Weather Clim. Dynam., 4, 531–541, https://doi.org/10.5194/wcd-4-531-2023, https://doi.org/10.5194/wcd-4-531-2023, 2023
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Using ensemble members from the ERA5 reanalysis, the most widely used method for estimating tropical-width trends, the meridional stream function, was found to have large error, particularly in the Northern Hemisphere and in the summer, because of weak gradients at the tropical edge and poor data quality. Another method, using the latitude where the surface wind switches from westerly to easterly, was found to have lower error due to better-observed data.
Nele Tim, Eduardo Zorita, Birgit Hünicke, and Ioana Ivanciu
Weather Clim. Dynam., 4, 381–397, https://doi.org/10.5194/wcd-4-381-2023, https://doi.org/10.5194/wcd-4-381-2023, 2023
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As stated by the IPCC, southern Africa is one of the two land regions that are projected to suffer from the strongest precipitation reductions in the future. Simulated drying in this region is linked to the adjacent oceans, and prevailing winds as warm and moist air masses are transported towards the continent. Precipitation trends in past and future climate can be partly attributed to the strength of the Agulhas Current system, the current along the east and south coasts of southern Africa.
William Torgerson, Juliane Schwendike, Andrew Ross, and Chris J. Short
Weather Clim. Dynam., 4, 331–359, https://doi.org/10.5194/wcd-4-331-2023, https://doi.org/10.5194/wcd-4-331-2023, 2023
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We investigated intensity fluctuations that occurred during the rapid intensification of Hurricane Irma (2017) to understand their effects on the storm structure. Using high-resolution model simulations, we found that the fluctuations were caused by local regions of strong ascent just outside the eyewall that disrupted the storm, leading to a larger and more symmetrical storm eye. This alters the location and intensity of the strongest winds in the storm and hence the storm's impact.
Anne Martin, Martin Weissmann, and Alexander Cress
Weather Clim. Dynam., 4, 249–264, https://doi.org/10.5194/wcd-4-249-2023, https://doi.org/10.5194/wcd-4-249-2023, 2023
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Global wind profiles from the Aeolus satellite mission are an important recent substitute for the Global Observing System, showing an overall positive impact on numerical weather prediction forecasts. This study highlights atmospheric dynamic phenomena constituting pathways for significant improvement of Aeolus for future studies, including large-scale tropical circulation systems and the interaction of tropical cyclones undergoing an extratropical transition with the midlatitude waveguide.
Elliott Michael Sainsbury, Reinhard K. H. Schiemann, Kevin I. Hodges, Alexander J. Baker, Len C. Shaffrey, Kieran T. Bhatia, and Stella Bourdin
Weather Clim. Dynam., 3, 1359–1379, https://doi.org/10.5194/wcd-3-1359-2022, https://doi.org/10.5194/wcd-3-1359-2022, 2022
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Post-tropical cyclones (PTCs) can bring severe weather to Europe. By tracking and identifying PTCs in five global climate models, we investigate how the frequency and intensity of PTCs may change across Europe by 2100. We find no robust change in the frequency or intensity of Europe-impacting PTCs in the future. This study indicates that large uncertainties surround future Europe-impacting PTCs and provides a framework for evaluating PTCs in future generations of climate models.
Kieran M. R. Hunt and Andrew G. Turner
Weather Clim. Dynam., 3, 1341–1358, https://doi.org/10.5194/wcd-3-1341-2022, https://doi.org/10.5194/wcd-3-1341-2022, 2022
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More than half of India's summer monsoon rainfall arises from low-pressure systems: storms originating over the Bay of Bengal. In observation-based data, we examine how the generation and pathway of these storms are changed by the
boreal summer intraseasonal oscillation– the chief means of large-scale control on the monsoon at timescales of a few weeks. Our study offers new insights for useful prediction of these storms, important for both water resources planning and disaster early warning.
Cornelius Immanuel Weiß, Alexander Gohm, Mathias Walter Rotach, and Thomas Torora Minda
Weather Clim. Dynam., 3, 1003–1019, https://doi.org/10.5194/wcd-3-1003-2022, https://doi.org/10.5194/wcd-3-1003-2022, 2022
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Two gap flow events in the Great Rift Valley in Ethiopia were investigated based on observations, ERA5 reanalysis data, and simulations with the numerical weather prediction model WRF. The main focus was on strong winds in the area around Lake Abaya since the winds may generate waves on the lake which help to sustain the lake's ecology. That is important in terms of food supply for the local population. The gap winds exhibit a diurnal cycle and a seasonal dependence.
Matic Pikovnik, Žiga Zaplotnik, Lina Boljka, and Nedjeljka Žagar
Weather Clim. Dynam., 3, 625–644, https://doi.org/10.5194/wcd-3-625-2022, https://doi.org/10.5194/wcd-3-625-2022, 2022
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Potential future changes in the Hadley cells (HCs), either to their strength or their meridional extent, will profoundly impact the global distribution of precipitation. Therefore, to objectively evaluate and inter-compare past and future changes in the overall HC strength between different studies, a unified metric is required. The study proposes two new metrics, which alleviate the spatial inhomogeneities of the HC strength trend.
Ambrogio Volonté, Andrew G. Turner, Reinhard Schiemann, Pier Luigi Vidale, and Nicholas P. Klingaman
Weather Clim. Dynam., 3, 575–599, https://doi.org/10.5194/wcd-3-575-2022, https://doi.org/10.5194/wcd-3-575-2022, 2022
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In this study we analyse the complex seasonal evolution of the East Asian summer monsoon. Using reanalysis data, we show the importance of the interaction between tropical and extratropical air masses converging at the monsoon front, particularly during its northward progression. The upper-level flow pattern (e.g. the westerly jet) controls the balance between the airstreams and thus the associated rainfall. This framework provides a basis for studies of extreme events and climate variability.
Peter Pfleiderer, Shruti Nath, and Carl-Friedrich Schleussner
Weather Clim. Dynam., 3, 471–482, https://doi.org/10.5194/wcd-3-471-2022, https://doi.org/10.5194/wcd-3-471-2022, 2022
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Tropical cyclones are amongst the most dangerous weather events. Here we develop an empirical model that allows us to estimate the number and strengths of tropical cyclones for given atmospheric conditions and sea surface temperatures. An application of the model shows that atmospheric circulation is the dominant factor for seasonal tropical cyclone activity. However, warming sea surface temperatures have doubled the likelihood of extremely active hurricane seasons in the past decades.
Anantha Aiyyer and Terrell Wade
Weather Clim. Dynam., 2, 1051–1072, https://doi.org/10.5194/wcd-2-1051-2021, https://doi.org/10.5194/wcd-2-1051-2021, 2021
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We diagnose the mean circulations in the extratropics that are associated with rapid changes in the tropical storm storm speeds in the Atlantic. We show that rapid acceleration and deceleration are associated with distinct phasing between the tropical cyclone and weather waves of the extratropics. Over the past 5 decades, rapid acceleration and deceleration of tropical cyclones have reduced in magnitude. This might be related to the poleward shift and weakening of these extratropical waves.
Julianna Carvalho-Oliveira, Leonard Friedrich Borchert, Aurélie Duchez, Mikhail Dobrynin, and Johanna Baehr
Weather Clim. Dynam., 2, 739–757, https://doi.org/10.5194/wcd-2-739-2021, https://doi.org/10.5194/wcd-2-739-2021, 2021
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This work questions the influence of the Atlantic Meridional Overturning Circulation, an important component of the climate system, on the variability in North Atlantic sea surface temperature (SST) a season ahead, particularly how this influence affects SST prediction credibility 2–4 months into the future. While we find this relationship is relevant for assessing SST predictions, it strongly depends on the time period and season we analyse and is more subtle than what is found in observations.
Andrea M. Jenney, David A. Randall, and Elizabeth A. Barnes
Weather Clim. Dynam., 2, 653–673, https://doi.org/10.5194/wcd-2-653-2021, https://doi.org/10.5194/wcd-2-653-2021, 2021
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Storm activity in the tropics is one of the key phenomena that provide weather predictability on an extended timescale of about 10–40 d. The influence of tropical storminess on places like North America is sensitive to the overall average state of the climate system. In this study, we try to unpack the reasons why climate models do not agree on how the influence of these storms on weather over the North Pacific and North America will change in the future.
Philip Rupp and Peter Haynes
Weather Clim. Dynam., 2, 413–431, https://doi.org/10.5194/wcd-2-413-2021, https://doi.org/10.5194/wcd-2-413-2021, 2021
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We study a range of dynamical aspects of the Asian monsoon anticyclone as the response of a simple numerical model to a steady imposed heating distribution with different background flow configurations. Particular focus is given on interactions between the monsoon anticyclone and active mid-latitude dynamics, which we find to have a zonally localising effect on the time-mean circulation and to be able to qualitatively alter the temporal variability of the bulk anticyclone.
Joshua White and Anantha Aiyyer
Weather Clim. Dynam., 2, 311–329, https://doi.org/10.5194/wcd-2-311-2021, https://doi.org/10.5194/wcd-2-311-2021, 2021
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Using a simple general circulation model, we examine the structure of waves in the mid-tropospheric jet over North Africa. We show that waves occur in near-stationary groups or wave packets. As they are not swept out of the jet, this may provide the opportunity for the packets to amplify via feedback from other energy sources like rain-producing cloud complexes and mineral dust that are known to operate here. Our results address the criticism that the easterly jet is too short to sustain waves.
Franziska Aemisegger, Raphaela Vogel, Pascal Graf, Fabienne Dahinden, Leonie Villiger, Friedhelm Jansen, Sandrine Bony, Bjorn Stevens, and Heini Wernli
Weather Clim. Dynam., 2, 281–309, https://doi.org/10.5194/wcd-2-281-2021, https://doi.org/10.5194/wcd-2-281-2021, 2021
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The interaction of clouds in the trade wind region with the atmospheric flow is complex and at the heart of uncertainties associated with climate projections. In this study, a natural tracer of atmospheric circulation is used to establish a link between air originating from dry regions of the midlatitudes and the occurrence of specific cloud patterns. Two pathways involving transport within midlatitude weather systems are identified, by which air is brought into the trades within 5–10 d.
Jack Giddings, Adrian J. Matthews, Nicholas P. Klingaman, Karen J. Heywood, Manoj Joshi, and Benjamin G. M. Webber
Weather Clim. Dynam., 1, 635–655, https://doi.org/10.5194/wcd-1-635-2020, https://doi.org/10.5194/wcd-1-635-2020, 2020
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The impact of chlorophyll on the southwest monsoon is unknown. Here, seasonally varying chlorophyll in the Bay of Bengal was imposed in a general circulation model coupled to an ocean mixed layer model. The SST increases by 0.5 °C in response to chlorophyll forcing and shallow mixed layer depths in coastal regions during the inter-monsoon. Precipitation increases significantly to 3 mm d-1 across Myanmar during June and over northeast India and Bangladesh during October, decreasing model bias.
Giorgia Di Capua, Jakob Runge, Reik V. Donner, Bart van den Hurk, Andrew G. Turner, Ramesh Vellore, Raghavan Krishnan, and Dim Coumou
Weather Clim. Dynam., 1, 519–539, https://doi.org/10.5194/wcd-1-519-2020, https://doi.org/10.5194/wcd-1-519-2020, 2020
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We study the interactions between the tropical convective activity and the mid-latitude circulation in the Northern Hemisphere during boreal summer. We identify two circumglobal wave patterns with phase shifts corresponding to the South Asian and the western North Pacific monsoon systems at an intra-seasonal timescale. These patterns show two-way interactions in a causal framework at a weekly timescale and assess how El Niño affects these interactions.
Benjamin A. Stephens and Charles S. Jackson
Weather Clim. Dynam., 1, 389–404, https://doi.org/10.5194/wcd-1-389-2020, https://doi.org/10.5194/wcd-1-389-2020, 2020
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We analyze abrupt transitions between tropical rainfall regimes in a single-column model (SCM) of the tropical atmosphere. Multiple equilibria have been observed before in SCMs, but here we analyze actual bifurcations. We attribute the transitions to a sudden loss of evaporative cooling in the lower column due to nonlinearities in microphysics. This study may have implications for atmospheric dynamics more broadly but also for understanding abrupt transitions in paleoclimate.
Jorge L. García-Franco, Lesley J. Gray, and Scott Osprey
Weather Clim. Dynam., 1, 349–371, https://doi.org/10.5194/wcd-1-349-2020, https://doi.org/10.5194/wcd-1-349-2020, 2020
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The American monsoon system is the main source of rainfall for the subtropical Americas and an important element of Latin American agriculture. Here we use state-of-the-art climate models from the UK Met Office in different configurations to analyse the performance of these models in the American monsoon. Resolution is found to be a key factor to improve monsoon representation, whereas integrated chemistry does not improve the simulated monsoon rainfall.
Cited articles
Agnihotri, C. and Singh, M.: Satellite study of western disturbances, Mausam,
33, 249–254, 1982. a
Ahmed, F., Adnan, S., and Latif, M.: Impact of jet stream and associated
mechanisms on winter precipitation in Pakistan, Meteorol. Atmos.
Phys., 132, 225–238, https://doi.org/10.1007/s00703-019-00683-8, 2019. a, b, c
Bao, J.-W., Michelson, S. A., Neiman, P. J., Ralph, F. M., and Wilczak, J. M.:
Interpretation of Enhanced Integrated Water Vapor Bands Associated with
Extratropical Cyclones: Their Formation and Connection to Tropical Moisture,
Mon. Weather Rev., 134, 1063–1080, https://doi.org/10.1175/MWR3123.1, 2006. a
Baudouin, J.-P.: Synoptic processes of winter precipitation in the Upper Indus Basin. Weather and Climate Dynamics, Zenodo [code], https://doi.org/10.5281/zenodo.5562173, 2021. a
Baudouin, J.-P., Herzog, M., and Petrie, C. A.: Cross-validating precipitation datasets in the Indus River basin, Hydrol. Earth Syst. Sci., 24, 427–450, https://doi.org/10.5194/hess-24-427-2020, 2020b. a, b, c, d
Bollasina, M. and Nigam, S.: Modeling of Regional Hydroclimate Change over the
Indian Subcontinent: Impact of the Expanding Thar Desert, J.
Climate, 24, 3089–3106, https://doi.org/10.1175/2010JCLI3851.1, 2011. a
Boschi, R. and Lucarini, V.: Water Pathways for the Hindu-Kush-Himalaya and
an Analysis of Three Flood Events, Atmosphere, 10, 489, https://doi.org/10.3390/atmos10090489, 2019. a
Brent, R. P.: Algorithms for minimization without derivatives, Prentice-Hall,
Englewood Cliffs, New Jersey, 1973. a
Cannon, F., Carvalho, L. M., Jones, C., and Bookhagen, B.: Multi-annual
variations in winter westerly disturbance activity affecting the Himalaya,
Clim. Dynam., 44, 441–455, https://doi.org/10.1007/s00382-014-2248-8, 2015. a, b
Cannon, F., Carvalho, L. M., Jones, C., and Norris, J.: Winter westerly
disturbance dynamics and precipitation in the western Himalaya and Karakoram:
a wave-tracking approach, Theor. Appl. Climatol., 125, 27–44,
https://doi.org/10.1007/s00704-015-1489-8, 2016. a, b
Chakraborty, A., Behera, S. K., Mujumdar, M., Ohba, R., and Yamagata, T.:
Diagnosis of tropospheric moisture over Saudi Arabia and influences of IOD
and ENSO, Mon. Weather Rev., 134, 598–617, https://doi.org/10.1175/MWR3085.1,
2006. a
Dacre, H. F., Hawcroft, M. K., Stringer, M. A., and Hodges, K. I.: An
Extratropical Cyclone Atlas: A Tool for Illustrating Cyclone Structure and
Evolution Characteristics, B. Am. Meteorol. Soc.,
93, 1497–1502, https://doi.org/10.1175/BAMS-D-11-00164.1, 2012. a
Dahri, Z. H., Moors, E., Ludwig, F., Ahmad, S., Khan, A., Ali, I., and Kabat,
P.: Adjustment of measurement errors to reconcile precipitation distribution
in the high-altitude Indus basin, Int. J. Climatol., 38,
3842–3860, 2018. a
Dar, S. S., Ghosh, P., and Hillaire-Marcel, C.: Convection, terrestrial
recycling and oceanic moisture regulate the isotopic composition of
precipitation at Srinagar, Kashmir, J. Geophys. Res.-Atmos., 126, e2020JD032853, https://doi.org/10.1029/2020JD032853, 2021. a
Datta, R. and Gupta, M.: Synoptic study of the formation and movements of
western depressions, Indian J. Meteorol. Geophys, 18, 45–50, 1967. a
de Vries, A. J., Feldstein, S. B., Riemer, M., Tyrlis, E., Sprenger, M.,
Baumgart, M., Fnais, M., and Lelieveld, J.: Dynamics of
tropical–extratropical interactions and extreme precipitation events in
Saudi Arabia in autumn, winter and spring, Q. J. Roy.
Meteor. Soc., 142, 1862–1880, https://doi.org/10.1002/qj.2781, 2016. a
Dimri, A. P.: Impact of horizontal model resolution and orography on the
simulation of a western disturbance and its associated precipitation,
Meteorol. Appl., 11, 115–127, https://doi.org/10.1017/S1350482704001227,
2004. a
Dimri, A. P.: The transport of momentum, sensible heat, potential energy and
moisture over the western Himalayas during the winter season, Theor.
Appl. Climatol., 90, 49–63, https://doi.org/10.1007/s00704-006-0274-0, 2007. a, b, c
Dimri, A. P.: Intraseasonal oscillation associated with the Indian winter
monsoon, J. Geophys-Res.-Atmos., 118, 1189–1198,
https://doi.org/10.1002/jgrd.50144, 2013. a, b
Dimri, A. P. and Niyogi, D.: Regional climate model application at subgrid
scale on Indian winter monsoon over the western Himalayas, Int.
J. Climatol., 33, 2185–2205, https://doi.org/10.1002/joc.3584, 2013. a, b
Grams, C. M., Wernli, H., Böttcher, M., Čampa, J., Corsmeier, U., Jones,
S. C., Keller, J. H., Lenz, C.-J., and Wiegand, L.: The key role of diabatic
processes in modifying the upper-tropospheric wave guide: a North Atlantic
case-study, Q. J. Roy. Meteor. Soc., 137,
2174–2193, https://doi.org/10.1002/qj.891, 2011. a
Hersbach, H., Bell, B., Berrisford, P., Biavati, G., Horányi, A., Muñoz Sabater, J., Nicolas, J., Peubey, C., Radu, R., Rozum, I., Schepers, D., Simmons, A., Soci, C., Dee, D., and Thépaut, J.-N.: ERA5 hourly data on pressure levels from 1979 to present, Copernicus Climate Change Service (C3S) Climate Data Store (CDS) [data set], https://doi.org/10.24381/cds.bd0915c6, 2018a. a
Hersbach, H., de Rosnay, P., Bell, B., Schepers, D., Simmons, A., Soci, C., Abdalla, S., Alonso-Balmaseda, M., Balsamo, G., Bechtold, P., Berrisford, P., Bidlot, J.-R., de Boisséson, E., Bonavita, M., Browne, P., Buizza, R., Dahlgren, P., Dee, D., Dragani, R., Diamantakis, M.,Flemming, J., Forbes, R., Geer, A., Haiden, T., Hólm, E., Haimberger, L., Hogan, R., Horányi, A., Janiskova, M., Laloyaux, P., Lopez,P., Munoz-Sabater, J., Peubey, C., Radu, R., Richardson, D., Thépaut, J.-N., Vitart, F., Yang, X., Zsótér, E., and Zuo, H.: Operationalglobal
reanalysis: progress, future directions and synergies with NWP, ERA-report, Serie 27, https://doi.org/10.21957/tkic6g3wm, 2018b. a
Hewitt, K.: Glacier change, concentration, and elevation effects in the
karakoram Himalaya, Upper Indus Basin, Mountain Res.
Dev., 31, 188–200, https://doi.org/10.1659/MRD-JOURNAL-D-11-00020.1, 2011. a
Hunt, K. M. and Dimri, A.: Synoptic-scale precursors of landslides in the
western Himalaya and Karakoram, Sci. Total Environ., 776,
145895, https://doi.org/10.1016/j.scitotenv.2021.145895, 2021. a
Hunt, K. M. R., Turner, A. G., and Schiemann, R. K. H.: How interactions
between tropical depressions and western disturbances affect heavy
precipitation in South Asia, Mon. Weather Rev.,
https://doi.org/10.1175/MWR-D-20-0373.1, 2021. a, b
Jeelani, G., Deshpande, R. D., Galkowski, M., and Rozanski, K.: Isotopic composition of daily precipitation along the southern foothills of the Himalayas: impact of marine and continental sources of atmospheric moisture, Atmos. Chem. Phys., 18, 8789–8805, https://doi.org/10.5194/acp-18-8789-2018, 2018. a, b
Krishnamurti, T. N.: The subtropical jet stream of winter, J.
Meteorol. 18, 172–191,
https://doi.org/10.1175/1520-0469(1961)018<0172:TSJSOW>2.0.CO;2, 1961. a, b
Krishnan, R., Sabin, T. P., Madhura, R. K., Vellore, R. K., Mujumdar, M.,
Sanjay, J., Nayak, S., and Rajeevan, M.: Non-monsoonal precipitation
response over the Western Himalayas to climate change, Clim. Dynam., 52,
4091–4109, https://doi.org/10.1007/s00382-018-4357-2, 2018. a
Madhura, R. K., Krishnan, R., Revadekar, J. V., Mujumdar, M., and Goswami,
B. N.: Changes in western disturbances over the Western Himalayas in a
warming environment, Clim. Dynam., 44, 1157–1168,
https://doi.org/10.1007/s00382-014-2166-9, 2015. a
Mahanta, R., Sarma, D., and Choudhury, A.: Heavy rainfall occurrences in
northeast India, Int. J. Climatol., 33, 1456–1469,
https://doi.org/10.1002/joc.3526, 2013. a
Malurkar, S. L.: Abnormally dry and wet western disturbances over North
India, Curr. Sci., 16, 139–141, 1947. a
Mannan, M. A., Chowdhury, M. A. M., Karmakar, S., Ahmed, S., and Rahman, A.:
Analysis and prediction of rainfall associated with Western Disturbances
during winter months in Bangladesh, Den-Drop (A Scientific Journal of
Meteorology and Geo-physics), Bangladesh Meteorological Department, Dhaka,
Bangladesh, 4, 12–24, 2017. a
Martínez-Alvarado, O., Joos, H., Chagnon, J., Boettcher, M., Gray, S. L.,
Plant, R. S., Methven, J., and Wernli, H.: The dichotomous structure of the
warm conveyor belt, Q. J. Roy. Meteor. Soc.,
140, 1809–1824, https://doi.org/10.1002/qj.2276, 2014. a
Mujumdar, M.: Diagnostic Analysis of Wintertime Rainfall Events Over the
Arabian Region, Contribution from IITM, Indian Institute of Tropical
Meteorology, ISSN 0252-1075,
2006. a
Mull, S. and Desai, B.: The Origin and Structure of the Winter Depressions of
Northwest India, Technical Note 25:18, India Meteorological Department, India, 1947. a
Nathans, L., Oswald, F., and Nimon, K.: Interpreting multiple linear
regression: A guidebook of variable importance, Practical Assessment,
Research and Evaluation, 17, 1–19, 2012. a
Pisharoty, P. and Desai, B.: Western disturbances and Indian weather, Indian
J. Meteorol. Geophys, 7, 333–338, 1956. a
Rakesh, V., Singh, R., Yuliya, D., Pal, P. K., and Joshi, P. C.: Impact of
variational assimilation of MODIS thermodynamic profiles in the simulation of
western disturbance, Int. J. Remote Sens., 30,
4867–4887, https://doi.org/10.1080/01431160902980332, 2009.
a
Rana, S., McGregor, J., and Renwick, J.: Precipitation seasonality over the
Indian subcontinent: An evaluation of gauge, reanalyses, and satellite
retrievals, J. Hydrometeorol., 16, 631–651, 2015. a
Sankar, N. V. and Babu, C.: Role of vorticity advection and thermal advection
in the development of western disturbance during North Indian winter,
Meteorol. Atmos. Phys., 132, 515–529, 2020. a
Schiemann, R., Lüthi, D., and Schär, C.: Seasonality and Interannual
Variability of the Westerly Jet in the Tibetan Plateau Region, J.
Climate, 22, 2940–2957, https://doi.org/10.1175/2008JCLI2625.1, 2009. a, b, c, d
Singh, S. P., Bassignana-Khadka, I., Singh Karky, B., and Sharma, E.: Climate
change in the Hindu Kush-Himalayas: the state of current knowledge, Tech.
rep., International Centre for Integrated Mountain Development (ICIMOD), Kathmandu,
2011. a
Smith, R. L., Joel W. Ager, J., and Williams, D. L.: Suppressor Variables in
Multiple Regression/Correlation, Educ. Psychol. Meas.,
52, 17–29, https://doi.org/10.1177/001316449205200102, 1992. a
Syed, F. S., Giorgi, F., Pal, J. S., and Keay, K.: Regional climate model
simulation of winter climate over Central–Southwest Asia, with emphasis on
NAO and ENSO effects, Int. J. Climato., 30, 220–235,
https://doi.org/10.1002/joc.1887, 2010. a, b, c
Thapa, K., Endreny, T. A., and Ferguson, C. R.: Atmospheric Rivers Carry
Nonmonsoon Extreme Precipitation Into Nepal, J. Geophys.
Res.-Atmos., 123, 5901–5912, https://doi.org/10.1029/2017JD027626, 2018. a
Thomas, L., Dash, S. K., Mohanty, U. C., and Babu, C. A.: Features of western
disturbances simulated over north India using different land-use data sets,
Meteorol. Appl., 25, 246–253, https://doi.org/10.1002/met.1687, 2018. a
Tinmaker, M. and Ali, K.: Space time variation of lightning activity over
northeast India, Meteorol. Z., 21, 135–143, 2012. a
Xueyuan, K. and Yaocun, Z.: Seasonal variation of the East Asian Subtropical
Westerly Jet and its association with the heating field over East Asia,
Adv. Atmos. Sci., 22, 831–840, https://doi.org/10.1007/bf02918683,
2005. a
Yadav, R. K., Kumar, K. R., and Rajeevan, M.: Characteristic features of
winter precipitation and its variability over northwest India, J.
Earth Syst. Sci., 121, 611–623, https://doi.org/10.1007/s12040-012-0184-8, 2012. a
Yang, S., Lau, K.-M., Yoo, S.-H., Kinter, J. L., Miyakoda, K., and Ho, C.-H.:
Upstream Subtropical Signals Preceding the Asian Summer Monsoon
Circulation, J. Climate, 17, 4213–4229, https://doi.org/10.1175/JCLI3192.1,
2004. a
Zhu, Y. and Newell, R. E.: A Proposed Algorithm for Moisture Fluxes from
Atmospheric Rivers, Mon. Weather Rev., 126, 725–735,
https://doi.org/10.1175/1520-0493(1998)126<0725:APAFMF>2.0.CO;2, 1998. a
Short summary
Western disturbances are mid-latitude, high-altitude, low-pressure areas that bring orographic precipitation into the Upper Indus Basin. Using statistical tools, we show that the interaction between western disturbances and relief explains the near-surface, cross-barrier wind activity. We also reveal the existence of a moisture pathway from the nearby seas. Overall, we offer a conceptual framework for western-disturbance activity, particularly in terms of precipitation.
Western disturbances are mid-latitude, high-altitude, low-pressure areas that bring orographic...
