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DOI10.5194/acp-22-7861-2022
Suppressed migrating diurnal tides in the mesosphere and lower thermosphere region during El Nino in northern winter and its possible mechanism
Cen, Yetao; Yang, Chengyun; Li, Tao; Russell, James M., III; Dou, Xiankang
发表日期2022
ISSN1680-7316
EISSN1680-7324
起始页码7861
结束页码7874
卷号22期号:12页码:14
英文摘要As observed by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER), the migrating diurnal tide (DW1) in the upper mesosphere and lower thermosphere (MLT) region decreased by similar to 10% during El Nino in the Northern Hemisphere (NH) winter (December-January-February) from 2002 to 2020. According to the multiple linear regression (MLR) analysis, the linear effects of El Nino on the tropical MLT DW1 are significantly negative in both SABER observations and SD-WACCM (the Specified-Dynamics version of the Whole Atmosphere Community Climate Model) simulations. The DW1 response to El Nino in NH winter is much stronger than its annual mean response. As suggested by SD-WACCM simulation, Hough mode (1, 1) dominates the DW1 tidal variation in the tropical MLT region. The consistency between the (1, 1) mode in the tropopause region and the MLT region and the downward phase progression from 15 to 100 km indicates the direct upward propagation of DW1 from the excitation source in the troposphere. The suppressed DW1 heating rates in the tropical troposphere (averaged over similar to 0-16 km and 35 degrees S-35 degrees N) during El Nino winter contribute to the decreased DW1 tide. To evaluate the effect of the gravity waves (GWs) on the tide, the GW forcing is calculated as the GW drag weighted by the phase relation between DW1 GW drag and DW1 wind. The negative GW forcing in the tropical upper mesosphere would significantly suppress the MLT DW1 tide during El Nino winter. This tide-GW interaction could be a dominant mechanism for DW1 response in the MLT to El Nino. During El Nino winter, the increased ratio of the absolute and planetary vorticity (R) suppresses the waveguide and thus the DW1 amplitude in the subtropical mesosphere. However, the effect of the waveguide might play a secondary role due to its relatively weak response.
学科领域Environmental Sciences; Meteorology & Atmospheric Sciences
语种英语
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号WOS:000812173400001
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/273017
作者单位Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Wuhan University; Hampton University
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GB/T 7714
Cen, Yetao,Yang, Chengyun,Li, Tao,et al. Suppressed migrating diurnal tides in the mesosphere and lower thermosphere region during El Nino in northern winter and its possible mechanism[J],2022,22(12):14.
APA Cen, Yetao,Yang, Chengyun,Li, Tao,Russell, James M., III,&Dou, Xiankang.(2022).Suppressed migrating diurnal tides in the mesosphere and lower thermosphere region during El Nino in northern winter and its possible mechanism.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),14.
MLA Cen, Yetao,et al."Suppressed migrating diurnal tides in the mesosphere and lower thermosphere region during El Nino in northern winter and its possible mechanism".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):14.
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