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Application of Cloudsat Data in the Study of Rainfall Clouds Over Tianshan Mountains

Author: ZhangPing
Tutor: ChenYongHang
School: Donghua University
Course: Environmental Science
Keywords: Total cloud amount Low-level clouds Characteristic parameters of ice clouds Vertical structure Correlation
CLC: P426.5
Type: Master's thesis
Year: 2012
Downloads: 30
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Abstract

The spatial and temporal distribution of clouds in the atmosphere, internal structure and its development and evolution of cloud systems are important topics at the forefront of the current atmospheric remote sensing, weather forecasting and climate prediction. With the growing number of environmental and meteorological satellite was launched, and has gradually become possible to reveal the relationship between the macro and micro features of precipitation clouds and cloud and precipitation. This article, based on the inversion of A-Train satellite formation Aqua and CloudSat two, satellite cloud data products, analysis of the temporal and spatial distribution of total cloud amount and characteristics of the low-level clouds cloud parameters in the Xinjiang region, combined with ground based on precipitation data for the Tianshan Mountains, selected the CloudSat satellite monitoring to 8 medium to heavy rain, the vertical distribution characteristics of ice clouds, moisture content, particle effective radius and particle number concentration and investigated three ice cloud parameters relationship between precipitation, the results are as follows: 1. Xinjiang region total cloud amount and characteristics of the low-level cloud parameters distribution very different. The three mountainous total cloud amount and lower and so the amount of the annual trend is similar to the spring Xia Jiyun measure, while the autumn and winter Ji Yun reduced significantly associated with the five-year average monthly changes of the two Cloud Cover; low-level cloud of ice column of water content in spring and summer, autumn and winter less cloud water content is the most abundant in the winter; similar annual variation of the three major mountain lower the effective radius of the cloud Shuiyun particles is relatively small effective radius of the summer and autumn, winter and spring is too large, but little volatility, and three mountain five-year average little difference between the maximum and minimum values; small annual variations of the effective diameter of the Tianshan and Altay mountain ice particles, and the effective diameter of the Kunlun Mountains in August sharply smaller Shuiyun effective particle radius, the minimum value of the scale of two particles appear in the August summer; affected by the mountain altitude, low-level cloud Kunlun Mountains effective height of the biggest, followed by the Tianshan mountain. The average years of cloud parameters spatial distribution, regardless of cloud cover, cloud water column content or low-level cloud particle scale, Tianshan region are high value area. 2 the top and bottom of the rain clouds is the ice water content of the low zone, the height of the ice water content of the high-value area in the clouds Central 6 ~ 7km, and a maximum peak in the vertical height of the cloud phenomenon, but the occurrence of the peak height slightly different; smaller the ice water content value range segment, the greater the share distribution ratio. The high value of the effective radius of the ice particles in the bottom of the clouds, and with the high rise was smaller trend; 500 to 1000μm value range segment of the ice particle effective radius larger proportion, especially 500 ~ 800μm in Range paragraph ice the largest proportion of effective particle radius greater than 1500μm ice particle effective radius ratio of no more than 1%. Ice particle number concentration increases with clouds vertical height rise, low value area of ??the bottom of the cloud ice particle number concentration, the high value area in the upper part of the clouds; rainfall process 3 process value range segment (0 ~ 3513L-1) are distributed ice particle number concentration, the concentration range of the course of 2 times the number of ice particles in the range between 0 ~ 2000L-1, the other two processes in the range of 0 ~ 1500L-1 range. 3. Consider cloud height, cloud ice water content, the regional average of the value of the effective radius of the ice particles and ice particle number concentration, respectively, on behalf of three parameter values, examine the 8 rainfall cloud parameters and precipitation relationship . Results 8 cases, ice water content and ice particle number concentration and precipitation of low effective radius of ice particles and precipitation is relatively significant; 4-9km height of paragraph (5 levels) ice water content good correlation and effective radius of ice particles and precipitation, cloud cover higher the relevance of the worse ice particle number concentration in the upper part of the cloud and precipitation than low-level high.

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