TY - JOUR
T1 - Gravity Wave Weakening During the 2019 Antarctic Stratospheric Sudden Warming
AU - Kogure, Masaru
AU - Yue, Jia
AU - Liu, Huixin
N1 - Funding Information:
This work was supported by the JSPS grant JRPs‐LEAD with the DFG program, JSPS KAKENHI Grant Numbers 19K23465, 18H01270, 18H04446, and 17KK0095, and the Scientific Committee on Antarctic Research (SCAR) fellowship award 2019. J. Yue was supported by NSF grants AGS‐1651394, AGS‐1834222 and by NASA AIM and 80NSSC20K0628. The authors would like to thank Larry Coy (SSAI and NASA GSFC) for help accessing the GEOS5 FP data, Joan Alexander (NWRA) for providing the AIRS kernel function, Justin Carstens (Virginia Tech) and Cora Randall (CU) for providing the CIPS RAA kernel function. They also helped us to compare the GWs in both GEOS‐5 FP and CIPS/AIM.
Publisher Copyright:
© 2021. American Geophysical Union. All Rights Reserved.
PY - 2021/4/28
Y1 - 2021/4/28
N2 - A rare Antarctic stratospheric sudden warming (SSW) occurred on August 30, 2019, and was a minor warming event. We investigated variations in gravity wave (GW) activity before and after this Antarctic SSW event using two satellite measurements (AIRS and CIPS) and reanalysis data (GEOS-5 FP). GW activity over the Andes decreased after August 30, although the westerly wind was 40–60 ms−1 and cannot filter out GWs with small zonal phase speed. This decline over the Andes was probably caused by wave saturation. Zonal mean GW activity over Antarctica and the Southern Ocean likewise decreased, with a weakening of zonal wind. The zonal mean GW activity further decreased around September 8 which coincided with a reversal of the zonal mean zonal wind at 40 km. The decline in the zonal mean GW activity after August 30 was probably caused by wind filtering and polar night jet breaking.
AB - A rare Antarctic stratospheric sudden warming (SSW) occurred on August 30, 2019, and was a minor warming event. We investigated variations in gravity wave (GW) activity before and after this Antarctic SSW event using two satellite measurements (AIRS and CIPS) and reanalysis data (GEOS-5 FP). GW activity over the Andes decreased after August 30, although the westerly wind was 40–60 ms−1 and cannot filter out GWs with small zonal phase speed. This decline over the Andes was probably caused by wave saturation. Zonal mean GW activity over Antarctica and the Southern Ocean likewise decreased, with a weakening of zonal wind. The zonal mean GW activity further decreased around September 8 which coincided with a reversal of the zonal mean zonal wind at 40 km. The decline in the zonal mean GW activity after August 30 was probably caused by wind filtering and polar night jet breaking.
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U2 - 10.1029/2021GL092537
DO - 10.1029/2021GL092537
M3 - Article
AN - SCOPUS:85105046326
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 8
M1 - e2021GL092537
ER -