Determination of sudden stratospheric warming dates and their classification according to the JRA-55 reanalysis data

Matvey M. Efimov; Nikolai M. Gavrilov

doi:10.1117/12.2690514

17 October 2023 Determination of sudden stratospheric warming dates and their classification according to the JRA-55 reanalysis data

Matvey M. Efimov, Nikolai M. Gavrilov

Author Affiliations +

Proceedings Volume 12780, 29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 127807B (2023) https://doi.org/10.1117/12.2690514
Event: XXIX International Symposium "Atmospheric and Ocean Optics, Atmospheric Physics", 2023, Moscow, Russian Federation

Abstract

For automatic searches for sudden stratospheric warming (SSW) events, their beginning/ending dates are defined as extrema of the first-order derivative simultaneous with zero values of the second derivative of temperature and zonal wind in time. A search for SSW dates at altitudes 30 and 40 km was performed, using the JRA-55 database for 59 years. The dates of the fasters change in temperature and zonal wind differ not more than two days for SSW searching the JRA- 55 database. The SSW dates correspond, within the limits of the uncertainties, to those obtained with other standard methods. Various types of SSW were analyzed. An alternative SSW classification was proposed. Frequently, before SSW developments, increases in the heat fluxes directed to the North Pole occur, which can heat the polar stratosphere.

Citation Download Citation

Matvey M. Efimov and Nikolai M. Gavrilov "Determination of sudden stratospheric warming dates and their classification according to the JRA-55 reanalysis data", Proc. SPIE 12780, 29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 127807B (17 October 2023); https://doi.org/10.1117/12.2690514

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