Precipitation Microphysics of Tropical Cyclones over Northeast China in 2020

Remote Sensing

Yilun Chen¹  Shumin Chen¹  Aoqi Zhang¹  Weibiao Li¹  Xiao Pan²  Yuanyuan Hu³ 

[1]Key Laboratory of Tropical Atmosphere-Ocean System, Ministry of Education, School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai 519000, China

[2]Opening Key Laboratory for Northeast Cold Vortex Research, Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China

[3]Shenzhen National Climate Observatory, Shenzhen 518040, China

关键词: precipitation microphysics;    tropical cyclone;    Northeast China;    droplet size distribution;    Global Precipitation Measurement;   

DOI  :  10.3390/rs14092188

来源: DOAJ

【 摘 要 】

Landfalling tropical cyclones (TCs) in Northeast China are rare because of the region’s high latitude (>40°N). In 2020, Northeast China was affected by three TCs within half a month—the first time on record. We used the Global Precipitation Measurement orbital dataset to study the precipitation microphysics during the TC period in Northeast China in 2020 (2020-TC), and during September in this region from 2014 to 2019 (hereafter September 2014–September 2019). FY-4A was used to provide cloud top height (CTH). The results show that, compared with September 2014–September 2019, the 2020-TC precipitation has stronger precipitation ice productivity, weaker deposition efficiency, stronger riming, and stronger coalescence processes. The storm top height (STH), CTH, and the difference between the two (CTH-STH) are indicative of the near-surface droplet size distribution (DSD), but there are differences: STH and CTH-STH both correlate significantly with mean mass-weighted drop diameter, whereas only the positive correlation between CTH and normalized drop concentration parameter passes the significance test. These results reveal for the first time the precipitation microphysics of landfalling TCs in Northeast China, and allow discussion of the validity of convective intensity indicators from the perspective of DSD.

【 授权许可】

Unknown