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Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009

Cited 5 time in wos
Cited 6 time in scopus
Title
Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009
Other Titles
2009년 1월 와동 분리형 성층권 돌연승온에 미치는 중력파의 역할
Authors
Song, Byeong-Gwon
Chun, Hye-Yeong
Song, In-Sun
Subject
Meteorology & Atmospheric Sciences
Keywords
Gravity wavesPlanetary wavesPotential vorticityStratospheric circulationWavesatmosphericMiddle atmosphere
Issue Date
2020-10
Citation
Song, Byeong-Gwon, Chun, Hye-Yeong, Song, In-Sun. 2020. "Role of Gravity Waves in a Vortex-Split Sudden Stratospheric Warming in January 2009". JOURNAL OF THE ATMOSPHERIC SCIENCES, 77(10): 3321-3342.
Abstract
The role of gravity waves (GWs) in a sudden stratospheric warming (SSW) event that occurred in January 2009 (SSW09) is investigated using the MERRA-2 reanalysis dataset. Nearly 2 weeks prior to the central date (Lag = 0), at which the zonal-mean zonal wind at 10 hPa and 60ºN first becomes negative, westward GW drag (GWD) is significantly enhanced in the lower mesosphere and stratosphere. At 5 days before Lag = 0, planetary waves (PWs) of zonal wavenumber (ZWN)-2 in the stratosphere are enhanced, while PWs of ZWN-1 are weakened, which are evident from the amplitudes of the PWs and their Eliassen-Palm flux divergence (EPD). To examine the relationship between PWs and GWs, a nonconservative GWD (NCGWD) source term of the linearized quasi-geostrophic potential vorticity equation is considered. A ZWN-2 pattern of the NCGWD forcing is developed around z = 55-60 km with a secondary peak around z = 40 km just before the PWs of ZWN-2 in the stratosphere began to enhance. A significant positive correlation between the NCGWD forcing in the upper stratosphere and lower mesosphere (USLM; 0.3-0.1 hPa in the present data) and the PWs of ZWN-2 in the stratosphere (5-1 hPa) exists. This result demonstrates that the amplification of the PWs of ZWN-2 in the stratosphere before the onset of SSW09 is likely related to the generation of PWs by GWD in the USLM, which is revealed by the enhanced downward-propagating PWs of ZWN-2 into the stratosphere from above.
URI
https://repository.kopri.re.kr/handle/201206/13038
DOI
http://dx.doi.org/10.1175/JAS-D-20-0039.1
Type
Article
Station
해당사항없음
Indexed
SCI
Appears in Collections  
2019-2019, Understanding polar upper atmospheric changes by energy inputs from the space environment and the lower atmosphere (19-19) / Jee, Geonhwa (PE19020)
2020-2020, Occurrence of aurora and their correlations with polar upper atmospheric and climate variabilities (20-20) / Jee, Geonhwa (PE20100)
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