ABSTRACT

In the present communication, using cloud-type distribution derived from CloudSat observations during the years 2006–2010 and vertical structure of LH derived from Tropical Rain Measuring Mission (TRMM) observations during the same period over the Indian summer monsoon (ISM) region, an attempt is made to relate the both. First, the regions where particular type of clouds forms predominantly are identified and then the LH profiles over those regions are associated with that particular cloud type. Using this approach, mean vertical structure of LH of Deep convective (DC) clouds over the Bay of Bengal (BoB) and Central India (CI) region, LH profile of Stratocumulus (Sc) and Cumulus (Cu) clouds over the Arabian Sea (ARB) and the Western Ghats (WG) region, respectively are constructed. The LH profile associated with DC clouds shows a broad distribution with a bimodal structure over the BoB and CI regions with peak value around 7 km. The LH profiles associated with Sc and Cu cloud types peak at lower height levels corresponding to shallow convection over ARB and WG regions. The significance of the present study lies in indirectly associating the observed vertical structure of LH with various types of clouds over the ISM region.

摘要

在本通讯中，使用印度夏季风（ISM）区域同期从2006-2010年CloudSat观测值得出的云型分布和热带雨水测量任务（TRMM）观测值得出的LH垂直结构，试图将两者联系起来。首先，确定主要形成特定类型的云的区域，然后将这些区域上的LH剖面与该特定云类型相关联。使用这种方法，孟加拉湾（BoB）和印度中部（CI）区域上的深对流（DC）云的LH的平均垂直结构，阿拉伯海上的层积云（Sc）和积云（Cu）的LH轮廓（分别建有ARB和Western Ghats（WG）地区。与DC云相关的LH剖面显示BoB和CI区域具有双峰结构的宽分布，峰值约为7 km。与Sc和Cu云类型相关的LH剖面在较低的高度处达到峰值，对应于ARB和WG区域的浅对流。本研究的意义在于将观测到的LH的垂直结构与ISM区域上各种类型的云间接相关联。