Articles | Volume 2, issue 3
https://doi.org/10.5194/wcd-2-631-2021
© 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-2-631-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 Jul 2021
Research article |
| 23 Jul 2021
| 23 Jul 2021
On the occurrence of strong vertical wind shear in the tropopause region: a 10-year ERA5 northern hemispheric study
Institute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
Daniel Kunkel
Institute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
Peter Hoor
Institute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
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Luis F. Millán, Gloria L. Manney, Harald Boenisch, Michaela I. Hegglin, Peter Hoor, Daniel Kunkel, Thierry Leblanc, Irina Petropavlovskikh, Kaley Walker, Krzysztof Wargan, and Andreas Zahn
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Hans-Christoph Lachnitt, Peter Hoor, Daniel Kunkel, Martina Bramberger, Andreas Dörnbrack, Stefan Müller, Philipp Reutter, Andreas Giez, Thorsten Kaluza, and Markus Rapp
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Helmut Ziereis, Peter Hoor, Jens-Uwe Grooß, Andreas Zahn, Greta Stratmann, Paul Stock, Michael Lichtenstern, Jens Krause, Vera Bense, Armin Afchine, Christian Rolf, Wolfgang Woiwode, Marleen Braun, Jörn Ungermann, Andreas Marsing, Christiane Voigt, Andreas Engel, Björn-Martin Sinnhuber, and Hermann Oelhaf
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Airborne observations were conducted in the lowermost Arctic stratosphere during the winter of 2015/2016. The observed distribution of reactive nitrogen shows clear indications of nitrification in mid-winter and denitrification in late winter. This was caused by the formation of polar stratospheric cloud particles, which were observed during several flights. The sedimentation and evaporation of these particles and the descent of air masses cause a redistribution of reactive nitrogen.
Valentin Lauther, Bärbel Vogel, Johannes Wintel, Andrea Rau, Peter Hoor, Vera Bense, Rolf Müller, and C. Michael Volk
Atmos. Chem. Phys., 22, 2049–2077, https://doi.org/10.5194/acp-22-2049-2022, https://doi.org/10.5194/acp-22-2049-2022, 2022
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We show airborne in situ measurements of the very short-lived ozone-depleting substances CH2Cl2 and CHCl3, revealing particularly high concentrations of both species in the lower stratosphere. Back-trajectory calculations and 3D model simulations show that the air masses with high concentrations originated in the Asian boundary layer and were transported via the Asian summer monsoon. We also identify a fast transport pathway into the stratosphere via the North American monsoon and by hurricanes.
Markus Jesswein, Heiko Bozem, Hans-Christoph Lachnitt, Peter Hoor, Thomas Wagenhäuser, Timo Keber, Tanja Schuck, and Andreas Engel
Atmos. Chem. Phys., 21, 17225–17241, https://doi.org/10.5194/acp-21-17225-2021, https://doi.org/10.5194/acp-21-17225-2021, 2021
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Meike K. Rotermund, Vera Bense, Martyn P. Chipperfield, Andreas Engel, Jens-Uwe Grooß, Peter Hoor, Tilman Hüneke, Timo Keber, Flora Kluge, Benjamin Schreiner, Tanja Schuck, Bärbel Vogel, Andreas Zahn, and Klaus Pfeilsticker
Atmos. Chem. Phys., 21, 15375–15407, https://doi.org/10.5194/acp-21-15375-2021, https://doi.org/10.5194/acp-21-15375-2021, 2021
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Airborne total bromine (Brtot) and tracer measurements suggest Brtot-rich air masses persistently protruded into the lower stratosphere (LS), creating a high Brtot region over the North Atlantic in fall 2017. The main source is via isentropic transport by the Asian monsoon and to a lesser extent transport across the extratropical tropopause as quantified by a Lagrange model. The transport of Brtot via Central American hurricanes is also observed. Lastly, the impact of Brtot on LS O3 is assessed.
Franziska Köllner, Johannes Schneider, Megan D. Willis, Hannes Schulz, Daniel Kunkel, Heiko Bozem, Peter Hoor, Thomas Klimach, Frank Helleis, Julia Burkart, W. Richard Leaitch, Amir A. Aliabadi, Jonathan P. D. Abbatt, Andreas B. Herber, and Stephan Borrmann
Atmos. Chem. Phys., 21, 6509–6539, https://doi.org/10.5194/acp-21-6509-2021, https://doi.org/10.5194/acp-21-6509-2021, 2021
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We present in situ observations of vertically resolved particle chemical composition in the summertime Arctic lower troposphere. Our analysis demonstrates the strong vertical contrast between particle properties within the boundary layer and aloft. Emissions from vegetation fires and anthropogenic sources in northern Canada, Europe, and East Asia influenced particle composition in the free troposphere. Organics detected in Arctic aerosol particles can partly be identified as dicarboxylic acids.
Johannes Schneider, Ralf Weigel, Thomas Klimach, Antonis Dragoneas, Oliver Appel, Andreas Hünig, Sergej Molleker, Franziska Köllner, Hans-Christian Clemen, Oliver Eppers, Peter Hoppe, Peter Hoor, Christoph Mahnke, Martina Krämer, Christian Rolf, Jens-Uwe Grooß, Andreas Zahn, Florian Obersteiner, Fabrizio Ravegnani, Alexey Ulanovsky, Hans Schlager, Monika Scheibe, Glenn S. Diskin, Joshua P. DiGangi, John B. Nowak, Martin Zöger, and Stephan Borrmann
Atmos. Chem. Phys., 21, 989–1013, https://doi.org/10.5194/acp-21-989-2021, https://doi.org/10.5194/acp-21-989-2021, 2021
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W. Richard Leaitch, John K. Kodros, Megan D. Willis, Sarah Hanna, Hannes Schulz, Elisabeth Andrews, Heiko Bozem, Julia Burkart, Peter Hoor, Felicia Kolonjari, John A. Ogren, Sangeeta Sharma, Meng Si, Knut von Salzen, Allan K. Bertram, Andreas Herber, Jonathan P. D. Abbatt, and Jeffrey R. Pierce
Atmos. Chem. Phys., 20, 10545–10563, https://doi.org/10.5194/acp-20-10545-2020, https://doi.org/10.5194/acp-20-10545-2020, 2020
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Black carbon is a factor in the warming of the Arctic atmosphere due to its ability to absorb light, but the uncertainty is high and few observations have been made in the high Arctic above 80° N. We combine airborne and ground-based observations in the springtime Arctic, at and above 80° N, with simulations from a global model to show that light absorption by black carbon may be much larger than modelled. However, the uncertainty remains high.
Cited articles
Bense, V.: Modifikation von Schwerewellen bei Propagation durch die Tropopause
– Idealisierte Modellstudien, Dissertation, Johannes Gutenberg-University
Mainz, https://doi.org/10.25358/openscience-2356, 2019. a, b
Berthet, G., Esler, J. G., and Haynes, P. H.: A Lagrangian perspective of the
tropopause and the ventilation of the lowermost stratosphere, J. Geophys.
Res.-Atmos., 112, 1–14, https://doi.org/10.1029/2006JD008295, 2007. a
ECMWF: IFS documentation – Cy41r2 Operational implementation 8 March 2016
Part III: Dynamics and numerical procedures, in: IFS Documentation CY41R2,
ECMWF, https://doi.org/10.21957/83wouv80, 2016. a
Ellrod, G. P. and Knapp, D. I.: An Objective Clear-Air Turbulence Forecasting
Technique: Verification and Operational Use, Weather Forecast., 7, 15,
https://doi.org/10.1175/1520-0434(1992)007<0150:AOCATF>2.0.CO;2, 1992. a
Endlich, R. M. and McLean, G. S.: Jet-Stream Structure over the Central United
States Determined from Aircraft Observations, J. Appl. Meteorol. Clim., 4,
83–90, https://doi.org/10.1175/1520-0450(1965)004<0083:jssotc>2.0.co;2, 1965. a
Ertel, H.: Ein neuer hydrodynamischer Erhaltungssatz, Die
Naturwissenschaften, 30, 543–544, https://doi.org/10.1007/BF01475602, 1942. a
European Centre for Medium Range Weather Forecasts: ERA5, available at:
https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era5, last access: 21 July 2021. a
Forster, P. and Shine, K. P.: Radiative forcing and temperature trends from
stratospheric ozone changes, J. Geophys. Res.-Atmos., 102, 10841–10855,
https://doi.org/10.1029/96JD03510, 1997. a
Fritts, D. C., Wang, L., and Werne, J. A.: Gravity wave-fine structure
interactions. Part I: Influences of fine structure form and orientation on
flow evolution and instability, J. Atmos. Sci., 70, 3710–3734,
https://doi.org/10.1175/JAS-D-13-055.1, 2013. a
Fritts, D. C., Wang, L., Geller, M. A., Lawrence, D. A., Werne, J., and
Balsley, B. B.: Numerical modeling of multiscale dynamics at a high reynolds
number: Instabilities, turbulence, and an assessment of ozmidov and thorpe
scales, J. Atmos. Sci., 73, 555–578, https://doi.org/10.1175/JAS-D-14-0343.1, 2016. a
Fritts, D. C., Wang, L., Baumgarten, G., Miller, A. D., Geller, M. A., Jones,
G., Limon, M., Chapman, D., Didier, J., Kjellstrand, C. B., Araujo, D.,
Hillbrand, S., Korotkov, A., Tucker, G., and Vinokurov, J.: High-resolution
observations and modeling of turbulence sources, structures, and intensities
in the upper mesosphere, J. Atmos. Sol.-Terr. Phys., 162, 57–78,
https://doi.org/10.1016/j.jastp.2016.11.006, 2017. a
Fueglistaler, S., Dessler, A. E., Dunkerton, T. J., Folkins, I., Fu, Q., and
Mote, P. W.: Tropical Tropopause Layer, Rev. Geophys., 47, 1–31,
https://doi.org/10.1029/2008RG000267, 2009. a
Gettelman, A. and Wang, T.: Structural diagnostics of the tropopause inversion
layer and its evolution, J. Geophys. Res.-Atmos., 120, 46–62,
https://doi.org/10.1002/2014JD021846, 2015. a
Grise, K. M., Thompson, D. W., and Birner, T.: A global survey of static
stability in the stratosphere and upper troposphere, J. Climate, 23,
2275–2292, https://doi.org/10.1175/2009JCLI3369.1, 2010. a
Hegglin, M. I., Boone, C. D., Manney, G. L., and Walker, K. A.: A global view
of the extratropical tropopause transition layer from Atmospheric Chemistry
Experiment Fourier Transform Spectrometer O3, H2O, and CO, J. Geophys.
Res.-Atmos., 114, 1–18, https://doi.org/10.1029/2008JD009984, 2009. a
Hersbach, H., Bell, B., Berrisford, P., Hirahara, S., Horányi, A.,
Muñoz-Sabater, J., Nicolas, J., Peubey, C., Radu, R., Schepers, D.,
Simmons, A., Soci, C., Abdalla, S., Abellan, X., Balsamo, G., Bechtold, P.,
Biavati, G., Bidlot, J., Bonavita, M., De Chiara, G., Dahlgren, P., Dee,
D., Diamantakis, M., Dragani, R., Flemming, J., Forbes, R., Fuentes, M.,
Geer, A., Haimberger, L., Healy, S., Hogan, R. J., Hólm, E.,
Janisková, M., Keeley, S., Laloyaux, P., Lopez, P., Lupu, C., Radnoti,
G., de Rosnay, P., Rozum, I., Vamborg, F., Villaume, S., and Thépaut,
J. N.: The ERA5 global reanalysis, Q. J. R. Meteorol. Soc., 146, 1999–2049,
https://doi.org/10.1002/qj.3803, 2020. a, b
Hoffmann, L., Günther, G., Li, D., Stein, O., Wu, X., Griessbach, S., Heng, Y., Konopka, P., Müller, R., Vogel, B., and Wright, J. S.: From ERA-Interim to ERA5: the considerable impact of ECMWF's next-generation reanalysis on Lagrangian transport simulations, Atmos. Chem. Phys., 19, 3097–3124, https://doi.org/10.5194/acp-19-3097-2019, 2019. a, b
Holton, J. R.: Stratosphere-Troposphere Exchange, Stratosphere Troposphere
Interactions, Springer, Dordrecht, pp. 331–355, https://doi.org/10.1007/978-1-4020-8217-7_8, 1995. a, b, c
Homeyer, C. R., Pan, L. L., Dorsi, S. W., Avallone, L. M., Weinheimer, A. J.,
O'Brien, A. S., Digangi, J. P., Zondlo, M. A., Ryerson, T. B., Diskin, G. S.,
and Campos, T. L.: Convective transport of water vapor into the lower
stratosphere observed during double-tropopause events, J. Geophys.
Res.-Atmos., 119, 10941–10958, https://doi.org/10.1002/2014JD021485, 2014. a
Hoor, P., Fischer, H., Lange, L., Lelieveld, J., and Brunner, D.: Seasonal
variations of a mixing layer in the lowermost stratosphere as identified by
the CO-O3 correlation from in situ measurements, J. Geophys. Res.-Atmos.,
107, ACL 1-1–ACL 1-11, https://doi.org/10.1029/2000JD000289, 2002. a
Hoor, P., Gurk, C., Brunner, D., Hegglin, M. I., Wernli, H., and Fischer, H.: Seasonality and extent of extratropical TST derived from in-situ CO measurements during SPURT, Atmos. Chem. Phys., 4, 1427–1442, https://doi.org/10.5194/acp-4-1427-2004, 2004. a
Hoor, P., Wernli, H., Hegglin, M. I., and Bönisch, H.: Transport timescales and tracer properties in the extratropical UTLS, Atmos. Chem. Phys., 10, 7929–7944, https://doi.org/10.5194/acp-10-7929-2010, 2010. a
Hoskins, B. J.: Towards a PV‐θ view of the general circulation,
Tellus A, 43, 27–35, https://doi.org/10.1034/j.1600-0870.1991.t01-3-00005.x, 1991. a
Hoskins, B. J., McIntyre, M. E., and Robertson, A. W.: On the use and
significance of isentropic potential vorticity maps, Q. J. R. Meteorol.
Soc., 111, 877–946, https://doi.org/10.1002/qj.49711147002, 1985. a
Jaeger, E. B. and Sprenger, M.: A Northern Hemispheric climatology of indices
for clear air turbulence in the tropopause region derived from ERA40
reanalysis data, J. Geophys. Res.-Atmos., 112, 1–13,
https://doi.org/10.1029/2006JD008189, 2007. a, b
Knox, J. A.: Possible mechanisms of clear-air turbulence in strongly
anticyclonic flows, Mon. Weather Rev., 125, 1251–1259,
https://doi.org/10.1175/1520-0493(1997)125<1251:PMOCAT>2.0.CO;2, 1997. a
Koch, P., Wernli, H., and Davies, H. C.: An event-based jet-stream climatology
and typology, Int. J. Climatol. 26, 283–301, https://doi.org/10.1002/joc.1255,
2006. a
Koteswaram, P.: The Easterly Jet Stream in the Tropics, Tellus, 10, 43–57,
https://doi.org/10.1111/j.2153-3490.1958.tb01984.x, 1958. a
Krisch, I., Ern, M., Hoffmann, L., Preusse, P., Strube, C., Ungermann, J., Woiwode, W., and Riese, M.: Superposition of gravity waves with different propagation characteristics observed by airborne and space-borne infrared sounders, Atmos. Chem. Phys., 20, 11469–11490, https://doi.org/10.5194/acp-20-11469-2020, 2020. a
Krishnamurti, T. N. and Bhalme, H.: Ocillations of a Monsoon System. Part I.
Observational Aspects, J. Atmos. Sci., 33, 1937–1954,
https://doi.org/10.1175/1520-0469(1976)033<1937:OOAMSP>2.0.CO;2, 1976. a
Kunkel, D., Hoor, P., and Wirth, V.: The tropopause inversion layer in baroclinic life-cycle experiments: the role of diabatic processes, Atmos. Chem. Phys., 16, 541–560, https://doi.org/10.5194/acp-16-541-2016, 2016. a
Kunkel, D., Hoor, P., Kaluza, T., Ungermann, J., Kluschat, B., Giez, A., Lachnitt, H.-C., Kaufmann, M., and Riese, M.: Evidence of small-scale quasi-isentropic mixing in ridges of extratropical baroclinic waves, Atmos. Chem. Phys., 19, 12607–12630, https://doi.org/10.5194/acp-19-12607-2019, 2019. a, b, c, d, e, f
Liu, H. L.: Large Wind Shears and Their Implications for Diffusion in Regions
With Enhanced Static Stability: The Mesopause and the Tropopause, J.
Geophys. Res.-Atmos., 122, 9579–9590, https://doi.org/10.1002/2017JD026748, 2017. a, b, c
Madonna, E., Wernli, H., Joos, H., and Martius, O.: Warm conveyor belts in the
ERA-Interim Dataset (1979–2010). Part I: Climatology and potential vorticity
evolution, J. Climate, 27, 3–26, https://doi.org/10.1175/JCLI-D-12-00720.1, 2014. a
Miles, J. W.: On the stability of heterogeneous shear flows, J. Fluid
Mech., 10, 496–508, https://doi.org/10.1017/S0022112061000305, 1961. a
Müller, S. K., Manzini, E., Giorgetta, M., Sato, K., and Nasuno, T.:
Convectively Generated Gravity Waves in High Resolution Models of Tropical
Dynamics, J. Adv. Mod. Earth Sys., 10, 2564–2588,
https://doi.org/10.1029/2018MS001390, 2018. a
Pan, L. L., Randel, W. J., Gary, B. L., Mahoney, M. J., and Hintsa, E. J.:
Definitions and sharpness of the extratropical tropopause: A trace gas
perspective, J. Geophys. Res.-Atmos., 109, 1–11,
https://doi.org/10.1029/2004JD004982, 2004. a, b
Plougonven, R. and Zhang, F.: Internal gravity waves from atmospheric jets and
fronts, Rev. Geophys., 52, 33–76,
https://doi.org/10.1002/2012RG000419, 2014. a
Podglajen, A., Bui, T. P., Dean-Day, J. M., Pfister, L., Jensen, E. J.,
Alexander, M. J., Hertzog, A., Kärcher, B., Plougonven, R., and Randel,
W. J.: Small-scale wind fluctuations in the tropical tropopause layer from
aircraft measurements: Occurrence, nature, and impact on vertical mixing, J.
Atmos. Sci., 74, 3847–3869, https://doi.org/10.1175/JAS-D-17-0010.1, 2017. a
Podglajen, A., Hertzog, A., Plougonven, R., and Legras, B.: Lagrangian gravity wave spectra in the lower stratosphere of current (re)analyses, Atmos. Chem. Phys., 20, 9331–9350, https://doi.org/10.5194/acp-20-9331-2020, 2020. a
Randel, W. J., Wu, F., and Forster, P.: The Extratropical Tropopause Inversion
Layer: Global Observations with GPS Data, and a Radiative Forcing Mechanism,
J. Atmos. Sci., 64, 4489–4496, https://doi.org/10.1175/2007JAS2412.1, 2007. a
Reiter, E. R.: The Nature of Clear Air Turbulence: A Review, in: Proceedings
of a Symposium on Clear Air Turbulence and Its Detection, edited by: Pao, Y. H. and Goldburg, A., Springer, Boston, MA,
https://doi.org/10.1007/978-1-4899-5615-6_2, 1969. a
Riese, M., Ploeger, F., Rap, A., Vogel, B., Konopka, P., Dameris, M., and
Forster, P.: Impact of uncertainties in atmospheric mixing on simulated UTLS
composition and related radiative effects, J. Geophys. Res.-Atmos., 117,
1–10, https://doi.org/10.1029/2012JD017751, 2012. a
Roja Raman, M., Jagannadha Rao, V. V., Venkat Ratnam, M., Rajeevan, M.,
Rao, S. V., Narayana Rao, D., and Prabhakara Rao, N.: Characteristics of
the Tropical Easterly Jet: Long-term trends and their features during active
and break monsoon phases, J. Geophys. Res.-Atmos., 114, 1–14,
https://doi.org/10.1029/2009JD012065, 2009. a, b
Schäfler, A., Harvey, B., Methven, J., Doyle, J. D., Rahm, S., Reitebuch,
O., Weiler, F., and Witschas, B.: Observation of jet stream winds during
nawdex and characterization of systematic meteorological analysis errors,
Mon. Weather Rev., 148, 2889–2907, https://doi.org/10.1175/MWR-D-19-0229.1, 2020. a
Seidel, D. J., Ross, R. J., Angell, J. K., and Reid, G. C.: Climatological
characteristics of the tropical tropopause as revealed by radiosondes, J.
Geophys. Res.-Atmos., 106, 7857–7878, https://doi.org/10.1029/2000JD900837, 2001. a, b
Shapiro, M. A.: The role of turbulent heat flux in the generation of potential
vorticity in the vicinity of upper-level jet stream systems, Mon. Weather Rev.,
104, 892–906,
https://doi.org/10.1175/1520-0493(1976)104<0892:TROTHF>2.0.CO;2, 1976. a, b
Shapiro, M. A.: Further evidence of the mesoscale and turbulent structure of
upper level jet stream–frontal zone systems, Mon. Weather Rev., 106, 1100–1111, https://doi.org/10.1175/1520-0493(1978)106<1100:FEOTMA>2.0.CO;2, 1978. a, b
Sharman, R. D., Trier, S. B., Lane, T. P., and Doyle, J. D.: Sources and
dynamics of turbulence in the upper troposphere and lower stratosphere: A
review, Geophys. Res. Lett., 39, 1–9, https://doi.org/10.1029/2012GL051996, 2012. a
Shaw, T. A., Baldwin, M., Barnes, E. A., Caballero, R., Garfinkel, C. I.,
Hwang, Y. T., Li, C., O'Gorman, P. A., Rivière, G., Simpson, I. R., and
Voigt, A.: Storm track processes and the opposing influences of climate
change, Nat. Geosci., 9, 656–664, https://doi.org/10.1038/ngeo2783, 2016. a
Škerlak, B., Sprenger, M., Pfahl, S., Tyrlis, E., and Wernli, H.:
Tropopause folds in ERA-interim: Global climatology and relation to extreme
weather events, J. Geophys. Res.-Atmos., 120, 4860–4877,
https://doi.org/10.1002/2014JD022787, 2015. a
Spreitzer, E., Attinger, R., Boettcher, M., Forbes, R., Wernli, H., and Joos,
H.: Modification of potential vorticity near the tropopause by
nonconservative processes in the ECMWF model, J. Atmos. Sci., 76,
1709–1726, https://doi.org/10.1175/JAS-D-18-0295.1, 2019. a, b, c
Stohl, A., Bonasoni, P., Cristofanelli, P., Collins, W., Feichter, J., Frank,
A., Forster, C., Gerasopoulos, E., Gäggeler, H., James, P., Kentarchos,
T., Kromp-Kolb, H., Krüger, B., Land, C., Meloen, J., Papayannis, A.,
Priller, A., Seibert, P., Sprenger, M., Roelofs, G. J., Scheel, H. E.,
Schnabel, C., Siegmund, P., Tobler, L., Trickl, T., Wernli, H., Wirth, V.,
Zanis, P., and Zerefos, C.: Stratosphere-troposphere exchange: A review, and
what we have learned from STACCATO, J. Geophys. Res.-Atmos., 108, 1–15,
https://doi.org/10.1029/2002jd002490, 2003. a
Sullivan, S. C., Schiro, K. A., Stubenrauch, C., and Gentine, P.: The Response
of Tropical Organized Convection to El Niño Warming, J. Geophys.
Res.-Atmos., 124, 8481–8500, https://doi.org/10.1029/2019JD031026, 2019. a
Sunilkumar, S. V., Babu, A., and Parameswaran, K.: Mean structure of the
tropical tropopause and its variability over the Indian longitude sector,
Clim. Dyn., 40, 1125–1140, https://doi.org/10.1007/s00382-012-1496-8, 2013. a
Sunilkumar, S. V., Muhsin, M., Parameswaran, K., Venkat Ratnam, M., Ramkumar,
G., Rajeev, K., Krishna Murthy, B. V., Sambhu Namboodiri, K. V.,
Subrahmanyam, K. V., Kishore Kumar, K., and Shankar Das, S.:
Characteristics of turbulence in the troposphere and lower stratosphere over
the Indian Peninsula, J. Atmos. Sol.-Terr. Phys., 133, 36–53,
https://doi.org/10.1016/j.jastp.2015.07.015, 2015. a, b, c, d, e
Suzuki, S., Nakamura, T., Ejiri, M. K., Tsutsumi, M., Shiokawa, K., and
Kawahara, T. D.: Simultaneous airglow, lidar, and radar measurements of
mesospheric gravity waves over Japan, J. Geophys. Res.-Atmos., 115, 1–12,
https://doi.org/10.1029/2010JD014674, 2010. a
Trier, S. B., Sharman, R. D., Muñoz-Esparza, D., and Lane, T. P.:
Environment and Mechanisms of Severe Turbulence in a Midlatitude Cyclone,
J. Atmos. Sci., 77, 3869–3889, https://doi.org/10.1175/jas-d-20-0095.1, 2020. a
Whiteway, J. A., Klaassen, G. P., Bradshaw, N. G., and Hacker, J.: Transition
to turbulence in shear above the tropopause, Geophys. Res. Lett., 31, 2–5,
https://doi.org/10.1029/2003GL018509, 2004. a
Wirth, V.: Static Stability in the Extratropical Tropopause Region, J. Atmos.
Sci., 60, 1395–1409, https://doi.org/10.1175/1520-0469(2003)060<1395:SSITET>2.0.CO;2,
2003.
a
Wirth, V.: A dynamical mechanism for tropopause sharpening, Meteorol.
Z., 13, 477–484, https://doi.org/10.1127/0941-2948/2004/0013-0477, 2004. a
WMO: Meteorology – A threedimensional science: Second session of the
Commission for Aerology, WMO Bulletin, VI, 134–138, 1957. a
Yang, S., Lau, K. M., and Kim, K. M.: Variations of the East Asian jet stream
and Asian-Pacific-American winter climate anomalies, J. Climate, 15,
306–325, https://doi.org/10.1175/1520-0442(2002)015<0306:voteaj>2.0.co;2, 2002. a, b
Zhang, Y., Zhang, S., Huang, C., Huang, K., Gong, Y., and Gan, Q.: The
interaction between the tropopause inversion layer and the inertial gravity
wave activities revealed by radiosonde observations at a midlatitude station
Yehui, J. Geophys. Res.-Atmos., 120, 8099–8111,
https://doi.org/10.1002/2015JD023115, 2015. a, b, c, d
Zierl, B. and Wirth, V.: The influence of radiation on tro- popause behavior
and stratosphere-troposphere exchange in an upper tropospheric anticyclone.,
J. Geophys. Res.-Atmos., 102, 23883–23894,
https://doi.org/10.1029/97JD01667, 1997. a
Short summary
We present a 10-year analysis on the occurrence of strong wind shear in the Northern Hemisphere, focusing on the region around the transport barrier that separates the first two layers of the atmosphere. The major result of our analysis is that strong wind shear above a certain threshold occurs frequently and nearly exclusively in this region, which, as an indicator for turbulent mixing, might have major implications concerning the separation efficiency of the transport barrier.
We present a 10-year analysis on the occurrence of strong wind shear in the Northern Hemisphere,...
