Structural Characteristics of Atmospheric Temperature and Humidity inside Clouds of Convective and Stratiform Precipitation in the Rainy Season over East Asia
Structural Characteristics of Atmospheric Temperature and Humidity inside Clouds of Convective and Stratiform Precipitation in the Rainy Season over East Asia
复制标题
东亚雨季对流和层状降水云内大气温湿度的结构特征
DOI：
10.1007/s13351-017-7038-x
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发表时间：
2017
影响因子：
3.2
通讯作者：
Fu Yunfei
中科院分区：
文献类型：
--
作者：
Wang Rui;Fu Yunfei
利用热带测雨使命降水雷达资料和综合全球探空仪资料构建的数据集，研究了1998-2012年东亚地区雨季（5 - 8月）对流和层状降水的热结构特征。结果表明，对流降水的风暴顶比层状降水的风暴顶高，这是由于对流降水的大气运动更不稳定。此外，对流和层状降水的风暴顶在1200 UTC时高于0000 UTC时的陆地区域，反之亦然海洋区域。此外，对流云和层状降水云内部的温度异常模式显示出约0-2 K的负异常，这导致对流层低层的冷却效应。这种冷却在1200 UTC的层状降水中更为明显。对流层中层的正距平大于2K，最强增暖出现在300 hPa。两类降水发生前对流层中层（700-500 hPa）相对湿度距平均表现为正距平，层状降水的增湿作用明显。
In this study, a merged dataset constructed from Tropical Rainfall Measuring Mission precipitation radar rain products and Integrated Global Radiosonde Archive data is used to investigate the thermal structural characteristics of convective and stratiform precipitation in the rainy season (May–August) of 1998–2012 over East Asia. The results show that the storm tops for convective precipitation are higher than those for stratiform precipitation, because of the more unstable atmospheric motions for convective precipitation. Moreover, the storm tops are higher at 1200 UTC than at 0000 UTC over land regions for both convective and stratiform precipitation, and vice versa for ocean region. Additionally, temperature anomaly patterns inside convective and stratiform precipitating clouds show a negative anomaly of about 0–2 K, which results in cooling effects in the lower troposphere. This cooling is more obvious at 1200 UTC for stratiform precipitation. The positive anomaly that appears in the middle troposphere is more than 2 K, with the strongest warming at 300 hPa. Relative humidity anomaly patterns show a positive anomaly in the middle troposphere (700–500 hPa) prior to the occurrence of the two types of precipitation, and the increase in moisture is evident for stratiform precipitation.