ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Comprehensive Observation and Characteristics Analysis of Convective Cloud Precipitation in Mount Everest Region
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Abstract:
The first comprehensive observation with multi-source remote sensing detection equipment for convective cloud precipitation on the northern slope of Mount Everest about 6 years in order to research the characteristics of convective cloud precipitation in Mount Everest region(MER) was reported in this paper based on the second comprehensive scientific investigation and research plan of the Tibetan Plateau. The first observation experiment with multi-source remote sensing detection equipment for studying convective cloud precipitation in the MER from 2019 to 2024, revealing the unique mechanism triggering summer convective cloud precipitation and the spatial and temporal evolution of its macro- and micro-scale physical structural characteristics. Multi-source detection equipment, including X-band dual-polarization Doppler weather radar, ground automatic stations, 2D video disdrometers, microwave radiometers and radio sounding, were employed to construct an observation network. Various methods such data quality control, data retrieval and data statistics based on the observation network data were adopted to carry out comparative analysis experiments，the research results show that the MER has unique structural characteristics of convective cloud precipitation compared with other regions as following: In terms of macroscopic characteristics, precipitation occurs frequently but with a short duration. Most of them are isolated convective cells, and the horizontal scale and vertical extension thickness of precipitation are much smaller than in other areas, and rainfall rate is weak in the boundary layer. In terms of microscopic characteristics, there are two phases of precipitation in the boundary layer under different conditions of atmospheric temperature vertical profile distribution: graupel and liquid raindrops, with distinctive characteristics of a narrow raindrop spectrum distribution width and higher raindrop number concentration and small raindrop equivalent diameter. The internal physical mechanism underlying the influence of the northern slope on summer convective cloud precipitation in the MER is that the extremely high elevation, complex topography, summer South Asian monsoon and intense solar radiation jointly promote the formation of intense thermal vertical motion throughout the troposphere and weak dynamic uplift and poor water vapor conditions in the boundary layer. This study may bridge the gap in detailed observations of the weather structure of the convective cloud precipitation for the northern slope of the MER in summer and provide a significant reference for further studies of Tibetan Plateau weather changes and their potential impacts on the East Asian climate.
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