The Climatology of Gravity Waves over the Low-Latitude Region Estimated by Multiple Meteor Radars.

Autor: Wang, Jianyuan, Yi, Wen, Li, Na, Xue, Xianghui, Wu, Jianfei, Ye, Hailun, Li, Jian, Chen, Tingdi, Tian, Yaoyu, Chang, Boyuan, Ding, Zonghua, Chen, Jinsong
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Zdroj: Remote Sensing; Aug2024, Vol. 16 Issue 16, p2870, 21p
Abstrakt: Atmospheric gravity waves (GWs) can strongly modulate middle atmospheric circulation and can be a significant factor for the coupling between the lower atmosphere and the middle atmosphere. GWs are difficult to resolve in global atmospheric models due to their small scale; thus, GW observations play an important role in middle atmospheric studies. The climatology of GW variance and momentum in the low-latitude mesosphere and lower thermosphere (MLT) region are revealed using multiple meteor radars, which are located at Kunming (25.6°N, 103.8°E), Sanya (18.4°N, 109.6°E), and Fuke (19.5°N, 109.1°E). The climatology and longitudinal variations in GW momentum fluxes and variance over the low-latitude region are reported. The GWs show strong seasonal variations and can greatly control the mesospheric horizontal winds via modulation of the quasi-geostrophic balance and momentum deposition. The different GW activities between Kunming and Sanya/Fuke are possibly consistent with the unique prevailing surface winds over Kunming and the convective system over the Tibetan Plateau according to the European Centre for Medium-Range Weather Forecasts (ECMWF), Reanalysis v5 (ERA5) data, and outgoing longwave radiation (OLR) data. These findings provide insight for better understanding the coupling between the troposphere and mesosphere. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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