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Unsteady Vortex Behavior in the Asian Monsoon Anticyclone.
Leong Wai Siu1,2, Kenneth P Bowman1
1Department of Atmospheric Sciences, Texas A&M University, College Station, Texas.
Journal of the Atmospheric Sciences
|January 4, 2021
Summary
The Asian monsoon anticyclone often splits into multiple smaller vortices, influencing atmospheric transport. These subvortices exhibit dynamic behaviors like merging and shedding, impacting circulation patterns.
Area of Science:
- Atmospheric Science
- Climatology
- Meteorology
Background:
- The Asian monsoon anticyclone (AMA) is a key feature of Northern Hemisphere summer circulation.
- Its circulation is influenced by diabatic heating, Rossby waves, and internal dynamics, leading to unsteady behavior.
Purpose of the Study:
- To analyze the substructure of the Asian monsoon anticyclone.
- To investigate the dynamics and behaviors of its constituent subvortices.
Main Methods:
- Utilized the ERA-Interim dataset for atmospheric data.
- Employed trajectory computations based on ERA-Interim winds.
Main Results:
- The AMA frequently contains two or three synoptic-scale subvortices (69% of the time).
- A single circulation center is observed less often (23% of the time).
- Observed subvortex behaviors include splitting, merging, and directional shedding (eastward/westward).
Conclusions:
- The Asian monsoon anticyclone commonly exhibits a multi-vortex structure.
- Subvortex dynamics are integral to the AMA's evolution and are closely linked to atmospheric stirring and transport processes.
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