杨冰韵,吴晓京. 2019. 基于CloudSat、FY-2E资料的中国海陆地区深对流及穿透性对流特征[J]. 气象学报, (0):-, doi:10.11676/qxxb2019.024
基于CloudSat、FY-2E资料的中国海陆地区深对流及穿透性对流特征
The sea-land characteristics of deep convections and convective overshootings over China with the CloudSat and FY-2E dataset
投稿时间:2018-01-23  修订日期:2018-09-10
DOI:10.11676/qxxb2019.024
中文关键词:  深对流,穿透性对流,CloudSat,FY-2E
英文关键词:Deep convection,Convective overshooting,CloudSat,FY-2E
基金项目:国家自然科学基金41075057、61531019
作者单位E-mail
杨冰韵 国家卫星气象中心 yangby@cma.gov.cn 
吴晓京 国家卫星气象中心 xiaoj_wu@163.com 
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中文摘要:
      深对流在地气系统的物质和能量交换中起着至关重要的作用,伴随而来的暴雨、雷电、冰雹等强天气会对人类社会产生影响。利用CloudSat/CALIPSO和FY-2E卫星数据,研究了中国地区不包含穿透性对流的深对流(DCwo)及穿透性对流(CO)的海陆分布、云顶红外亮温和云团特征(包括对流系统(CS)和对流单体(CC)的面积、活跃性对流比、偏心率、最低亮温、平均亮温梯度)。结果发现:CO比DCwo的云顶红外亮温更低,垂直高度上的雷达反射率更大;从发生次数来看,DCwo/CO在海洋比陆地多,低纬度比高纬度多,夏季相比其它季节多,冬季的海陆差异最大;从云顶亮温的分布来看,海洋比陆地、CO比DCwo集中分布区间的亮温值更低,CO的分布区间比DCwo集中;从云团特征来看,CS/CC的发生频率随面积的增大而减小,CO比DCwo、海洋比陆地更容易出现较大面积的CS/CC,海洋CO的活跃性对流比相对较高;偏心率在0.5以上的发生频率较高,CS形状更偏向于圆形,在海洋上更加明显;CO在海陆上的最低亮温集中分布区间为190-195 K,比DCwo的分布更集中,平均亮温梯度在0.1 K/km以下的发生频率较高。
英文摘要:
      Deep convection plays an important role in affecting the constituent and energy budgets of the troposphere. It also brings severe weather, such as torrential rain, lightning and hail, which has an impact on human society. Land-sea distributions, characteristics of infrared brightness temperature (BT) and properties of convective system (CS) of convective overshooting (CO) and deep convection without CO (DCwo) in China, were analyzed based on the CloudSat/CALIPSO and FY-2E datasets. Properties of CS, i.e., the area of CS, the area of convective cluster (CC), the convective fraction, the eccentricity, the minimum BT and the average gradient of BT were evaluated. The results indicated that lower BT in cloud top and higher radar reflectivity in vertical were detected in CO, relative to DCwo. The frequency of CO or DCwo was higher in ocean and low latitudes, as well as in summer. At the same time, there was the biggest difference of frequency between land and ocean in winter. The BT of cloud top which was mainly located in ocean and CO were lower than that in land and DCwo, respectively. The distribution interval of CO was more concentrated than DCwo. The frequency of CS or CC decreased with the increase of area. Bigger CS or CC was more likely to happen in CO and ocean. The value of convective fraction was higher in ocean. The occurrence of eccentricity of CS being above 0.5 was more frequent, which implied circular shapes of CS. Compared to land, it was more obvious in ocean. The concentrated distribution interval of minimum BT was 190-195 K in CO and ocean, which was smaller than DCwo. The concentrated distribution interval of average gradient of BT was below 0.1 K/km. The results can give the features of DC and CO and provide information to weather monitoring and numerical models.
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