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Gravity Wave Weakening During the 2019 Antarctic Stratospheric Sudden WarmingA 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 m/s 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.
Document ID
20220008522
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Masaru Kogure ORCID
(Kyushu University Fukuoka, Japan)
Jia Yue ORCID
(Catholic University of America Washington D.C., District of Columbia, United States)
Huixin Liu ORCID
(Kyushu University Fukuoka, Japan)
Date Acquired
May 27, 2022
Publication Date
April 11, 2021
Publication Information
Publication: Geophysical Research Letters
Publisher: Wiley / American Geophysical Union
Volume: 48
Issue: 8
Issue Publication Date: April 28, 2021
ISSN: 0094-8276
e-ISSN: 1944-8007
Subject Category
Space Sciences (General)
Funding Number(s)
CONTRACT_GRANT: 80NSSC20K0628
CONTRACT_GRANT: 80NSSC21M0180
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
External Peer Committee
Keywords
Gravity waves
Masaru Kogure
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