风切变
气候学
大气科学
长波
对流
发射长波辐射
环境科学
降水
辐射传输
辐射冷却
海面温度
云量
地质学
风速
气象学
云计算
地理
物理
海洋学
操作系统
量子力学
计算机科学
作者
Wei‐Ting Hsiao,Eric D. Maloney,Nicolas M. Leitmann-Niimi,Christian D. Kummerow
标识
DOI:10.1175/jcli-d-23-0262.1
摘要
Abstract Organized deep convective activity has been routinely monitored by satellite precipitation radar from the Tropical Rainfall Measuring Mission (TRMM) and Global Precipitation Mission (GPM). Organized deep convective activity is found to not only increase with SST above 27°C, but also with low-level wind shear. Precipitation shows a similar increasing relationship with both SST and low-level wind shear, except for the highest low-level wind shear. These observations suggest that the threshold for organized deep convection and precipitation in the tropics should consider not only SST, but also vertical wind shear. The longwave cloud radiative feedback, measured as the tropospheric longwave cloud radiative heating per amount of precipitation, is found to generally increase with stronger organized deep convective activity as SST and low-level wind shear increase. Organized deep convective activity, the longwave cloud radiative feedback, and cirrus ice cloud cover per amount of precipitation also appear to be controlled more strongly by SST than by the deviation of SST from its tropical mean. This study hints at the importance of non-thermodynamic factors such as vertical wind shear for impacting tropical convective structure, cloud properties, and associated radiative energy budget of the tropics.
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