报告题目：Barotropic and moisture-vortex growth of monsoon low pressure systems

报告专家：罗昊昌 博士

报告时间：2023年06月15日（周四）上午10:00

报告地点：气象楼423会议室

主 持 人：李青青 研究员

专家简介：

2018年毕业于南京信息工程大学，后于美国密歇根大学气候与空间科学工程系攻读博士学位，现为威斯康星大学研究助理。研究方向为大气波动和热带动力学，目前关注印度季风低压系统发展的动力过程、水汽作用和能量转换。

报告摘要：

To better understand the processes that govern the northwestward movement and growth of the Indian summer monsoon low pressure system (MLPS) precipitation, we created an MLPS index. It is shown that moisture governs the distribution of moist static energy (MSE) and is in phase with precipitation, vertical motion, and geopotential in the eddies during the MLPS cycle. Both the MSE tendency and maintenance are mainly contributed by the meridional advection of mean state MSE by the anomalous winds. The growth and decay of the MSE anomalies are largely determined by horizontal MSE advection, suggesting that the MSE anomalies undergo a moisture-vortex instability (MVI)-like growth. The structure, propagation and energetics of the regressed MLPSs are consistent with both barotropic and moisture-vortex growth. A “moisture mode activity”, analogous to the Eliassen-Palm flux, is created to depict the energy conversion through moisture.

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2023.06.09