Articles | Volume 3, issue 4
https://doi.org/10.5194/wcd-3-1399-2022
https://doi.org/10.5194/wcd-3-1399-2022
Research article
 | 
01 Dec 2022
Research article |  | 01 Dec 2022

Signatures of Eurasian heat waves in global Rossby wave spectra

Iana Strigunova, Richard Blender, Frank Lunkeit, and Nedjeljka Žagar

Data sets

The ERA-Interim reanalysis: configuration and performance of the data assimilation system (https://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=ml/) D. P. Dee, S. M. Uppala, A. J. Simmons, P. Berrisford, P. Poli, S. Kobayashi, U. Andrae, M. A. Balmaseda, G. Balsamo, P. Bauer, P. Bechtold, A. C. M. Beljaars, L. van de Berg, J. Bidlot, N. Bormann, C. Delsol, R. Dragani, M. Fuentes, A. J. Geer, L. Haimberger, S. B. Healy, H. Hersbach, E. V. Hólm, L. Isaksen, P. Kållberg, M. Köhler, M. Matricardi, A. P. McNally, B. M. Monge-Sanz, J.-J. Morcrette, B.-K. Park, C. Peubey, P. de Rosnay, C. Tavolato, J.-N. Thépaut, and F. Vitart https://doi.org/10.1002/qj.828

The ERA5 global reanalysis (https:// cds.climate.copernicus.eu/cdsapp#!/search?text=ERA5) H. Hersbach, B. Bell, P. Berrisford, et al. https://doi.org/10.1002/qj.3803

MERRA: NASA’s Modern-Era Retrospective Analysis for Research and Applications (https://disc.gsfc.nasa.gov/datasets?project=MERRA) M. M. Rienecker, M. J. Suarez, R. Gelaro, R. Todling, J. Bacmeister, E. Liu, M. G. Bosilovich, S. D. Schubert, L. Takacs, G.-K. Kim, S. Bloom, J. Chen, D. Collins, A. Conaty, A. da Silva, W. Gu, J. Joiner, R. D. Koster, R. Lucchesi, A. Molod, T. Owens, S. Pawson, P. Pegion, C. R. Redder, R. Reichle, F. R. Robertson, A. G. Ruddick, M. Sienkiewicz, and J. Woollen https://doi.org/10.1175/JCLI-D-11-00015.1

The JRA-55 reanalysis: General specifications and basic characteristics (https://search.diasjp.net/en/dataset/JRA55) S. Kobayashi, Y. Ota, Y. Harada, A. Ebita, M. Moriya, H. Onoda, K. Onogi, H. Kamahori, C. Kobayashi, H. Endo, K. Miyaoka, and K. Takahashi https://doi.org/10.2151/jmsj.2015-001

Normal-mode function representation of global 3-D data sets: open-access software for the atmospheric research community (https://modes.cen.uni-hamburg.de) N. Žagar, A. Kasahara, K. Terasaki, J. Tribbia, and H. Tanaka https://doi.org/10.5194/gmd-8-1169-2015

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Short summary
We show that the Eurasian heat waves (HWs) have signatures in the global circulation. We present changes in the probability density functions (PDFs) of energy anomalies in the zonal-mean state and in the Rossby waves at different zonal scales in relation to the changes in intramonthly variability. The skewness of the PDF of planetary-scale Rossby waves is shown to increase during HWs, while their intramonthly variability is reduced, a process referred to as blocking.