资源环境科技发展态势分析平台

A study is carried out to investigate the spatio-temporal variation of the properties of deep convective systems (DCSs) and intense DCSs (IDCSs) in association with lightning and hail features along with their ice microphysical properties over the South Asia. For this purpose 17 years (1998-2014) of Tropical Rainfall Measuring Mission (TRMM) and 4 years (2007-2010) of CloudSat data during the premonsoon and monsoon seasons are utilized. Significant spatio-temporal variability in the properties of DCSs and IDCSs is observed over the study region. During both the seasons, deepest DCSs (top 1%) are found over the land as well ocean without any preferred location. Over the land, its location of the maximum occurrence shifts from the Sumatra coast (Indonesia) and the southern part ofWest coast of India to the Meghalaya plateau and adjoining region during the premonsoon to monsoon. Over the ocean, the location of its maximum occurrence shifts from the equatorial Indian Ocean to the Bay of Bengal. Overall, during the premonsoon and monsoon seasons, their occurrence is more over the ocean and land, respectively. Occurrence of IDCSs is predominantly a land phenomena. The location of most intense IDCSs (top 1%) and its maximum occurrence shifts from the Meghalaya plateau to Western Himalaya Indentation regions during the premonsoon to monsoon. Over the land, of the total DCSs, only 11-18% of DCSs contribute to lightning features, whereas of the total IDCSs, 62-74% of IDCSs contribute to lightning feature. Similarly, over the land, the contribution of DCSs to hail feature is insignificant. However, 6-12% of IDCSs contribute to hail feature. The preferred locations of IDCSs with strong lightning and hail features are associated with relatively higher values of the ice water content and ice effective radius in the upper part of the mixed-phase region compared with other regions.