Influence of stratospheric sudden warming on the equatorial troposphere

Physics

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Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Polar Meteorology, Atmospheric Processes: Stratosphere/Troposphere Interactions, Atmospheric Processes: Tropical Meteorology

Scientific paper

A circulation change related to stratospheric sudden warming was investigated to examine the role of the stratosphere in equatorial tropospheric convective activity. A composite analysis of twelve stratospheric warmings from 1979 to 2001 revealed that the meridional circulation change associated with stratospheric warming in the polar region produces a lower temperature in the equatorial lower stratosphere and upper troposphere, which leads to a seesaw of convective activity in the troposphere - an enhancement of convective activity near the equatorial southern hemisphere (10°S-equator) but a suppression in the tropics of the northern hemisphere (5°N-15°N).

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