Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2016-729
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
15 Nov 2016
Review status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). The revised manuscript was not accepted.
Residual Mean Circulation and Temperature Changes during the Evolution of Stratospheric Sudden Warming Revealed in MERRA
Byeong-Gwon Song and Hye-Yeong Chun Department of Atmospheric Sciences, Yonsei University, Seoul, 03722, South Korea
Abstract. Residual mean circulation and temperature changes during the evolution of major stratospheric sudden warming (SSW) are investigated by composite analyses of 22 SSW events from 1979 to 2012 during the Northern Hemisphere winter (November–March) using four reanalysis data sets (MERRA, ERA-Interim, NCEP-NCAR, and JRA-55). The SSW events are classified as Type-1 or Type-2 based on the relative amplitude of planetary waves with zonal wavenumbers 1 and 2. The residual mean circulation induced by each forcing term in the Transformed Eulerian mean (TEM) momentum equation and the temperature advection associated with the circulation are calculated for both types of SSW, based on the generalized downward control principle using the MERRA data set. When ‘Lag = 0’ is defined as the day on which the wind reversal occurred at 60° N and 10 hPa, strong poleward and downward motion exists at Lag = −8 and Lag = −1 for Type-1 and at Lag = −3 for Type-2, which is induced primarily by the Eliassen–Palm flux divergence forcing (EPD). The poleward and downward motion is stronger for Type-2 than for Type-1. Gravity wave drag (GWD) produces a smaller contribution to the residual circulation than EPD. During the warming phase (at Lag = −2), strong temperature advection by the EPD induces primarily polar stratospheric warming. On the other hand, during the temperature recovery phase (at Lag = +2), anomalous negative temperature advection and diabatic cooling produce negative temperature tendency anomalies. Structures in the temperature tendency and temperature advection calculated using the MERRA data set are similar to those calculated using the ERA-Interim data set.

Citation: Song, B.-G. and Chun, H.-Y.: Residual Mean Circulation and Temperature Changes during the Evolution of Stratospheric Sudden Warming Revealed in MERRA, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2016-729, 2016.
Byeong-Gwon Song and Hye-Yeong Chun

Data sets

MERRA: NASA’s modern-era retrospective analysis for research and applications
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 ERA-Interim reanalysis: configuration and performance of the data
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 NCEP/NCAR 40-year reanalysis project
E.Kalnay, M. Kanamitsu, R. Kistler, W. Collins, D. Deaven, L. Gandin, M. Iredell, S. Saha, G. White, J. Woollen, Y. Zhu, A. Leetmaa, Reynolds, M. Chelliah, W. Ebisuzaki, W. Higgins, J. Jan Rowiak, K. C. Mo, C. Ropelewski, J. Wang, R. Jenne, and D. Joseph
https://doi.org/10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2
The JRA-55 Reanalysis: General Specification and Basic Characteristics
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
Byeong-Gwon Song and Hye-Yeong Chun

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