Cloud vertical structure, precipitation, and cloud radiative effects over Tibetan Plateau and its neighboring regions
Cloud vertical structure, precipitation, and cloud radiative effects over Tibetan Plateau and its neighboring regions
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青藏高原及邻区云垂直结构、降水及云辐射效应
DOI：
10.1002/2015jd024591
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发表时间：
2016
影响因子：
4.4
通讯作者：
Lu Jianhua
中科院分区：
文献类型：
--
作者：
Yan Yafei;Liu Yimin;Lu Jianhua
利用CALIPSO（CloudSat）和CALIPSO（Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations）产品以及TRMM（Tropical Rainfall Measuring Mission使命）降水资料，分析了青藏高原云的垂直结构及其与降水和云辐射效应（CRE）的关系，并与邻近陆地和热带海洋进行了对比。结果表明，青藏高原云量的季节变化特征为：1 ~ 4月出现单峰（位于7-11 km），6月中旬以后出现双峰（分别位于5-8 km和11-17 km），8月中旬以后恢复为单峰（位于5-10 km）。地形对水分供应的限制导致对云的压缩效应，即，云的厚度和云层的数量减少，在TP。地形诱导的压缩效应也表现在对应不同降水强度的云厚和云顶高度变化范围内，TP地区的云厚和云顶高度变化范围远小于邻近地区。青藏高原上空的长波CRE是一种净冷却效应。青藏高原上空CRE的垂直结构与其他地区相比是独特的：6月至10月上旬，在8 km高度存在一个强的净CRE冷却层;在7 km以下，地面上的净辐射加热层较浅，但较强，并且在青藏高原上空具有较强的季节变化。
The vertical structure of clouds and its connection with precipitation and cloud radiative effects (CRE) over the Tibetan Plateau (TP) are analyzed and compared with its neighboring land and tropical oceans based on CloudSat and Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) products and the Tropical Rainfall Measuring Mission (TRMM) precipitation data. Unique characteristics of cloud vertical structure and CRE over the TP are found. The cloud amount shows seasonal variation over the TP, which presents a single peak (located in 7–11 km) during January to April and two peaks (located in 5–8 km and 11–17 km separately) after mid‐June, and then resumes to one peak (located in 5–10 km) after mid‐August. Topography‐induced restriction on moisture supply leads to a compression effect on clouds, i.e., the reduction in both cloud thickness and number of cloud layers, over the TP. The topography‐induced compression effect is also shown in the range in the variation of cloud thickness and cloud‐top height corresponding to different precipitation intensity, which is much smaller over the TP than its neighboring regions. The longwave CRE in the atmosphere over the TP is a net cooling effect. The vertical structure of CRE over the TP is unique compared to other regions: there exists a strong cooling layer of net CRE at the altitude of 8 km, from June to the beginning of October; the net radiative heating layer above the surface is shallower but stronger underneath 7 km and with a stronger seasonal variation over the TP.