气候变化领域集成服务门户(CCPortal): The impacts of dust aerosol and convective available potential energy on precipitation vertical structure in southeastern China as seen from multisource observations

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DOI	10.5194/acp-23-2421-2023
	The impacts of dust aerosol and convective available potential energy on precipitation vertical structure in southeastern China as seen from multisource observations
	Zhu, Hongxia; Li, Rui; Yang, Shuping; Zhao, Chun; Jiang, Zhe; Huang, Chen
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	2421
结束页码	2437
卷号	23 期号:4 页码:17
英文摘要	The potential impacts of dust aerosols and atmospheric convective available potential energy (CAPE) on the vertical development of precipitating clouds in southeastern China (20-30 degrees N, 110-125 degrees E) in June, July, and August from 2000 to 2013 were studied using multisource observations. In southeastern China, heavy-dust conditions are coupled with strong northerly winds that transport air masses containing high concentrations of mineral dust particles, with cold temperatures, and with strong wind shear. This leads to weaker CAPE on dusty days compared with that on pristine days. Based on satellite observations, precipitating drops under dusty condi-tions grow faster in the middle atmospheric layers (with a temperature of between -5 and +2 degrees C) but slower in the upper and lower layers compared with their pristine counterparts. For a given precipitation top height (PTH), the precipitation rate under dusty conditions is lower in the upper layer but higher in the middle and lower layers. Moreover, the associated latent heating rate released by precipitation in the middle layer is higher. The precip-itation top temperature (PTT) shows a fairly good linear relationship with the near-surface rain rate (NSRR): the linear regression slope between the PTT and NSRR is stable under dusty and pristine conditions. However, the PTT0(the PTT related to rain onset) at the onset of precipitation is highly affected by both the CAPE and aerosol conditions. On pristine days, a stronger CAPE facilitates the vertical development of precipitation and leads to a decrease in PTT0, at a rate of-0.65 degrees C per 100 J kg(-1) of CAPE for deep convective precipitation (with a variation of 15 %) and at a rate of -0.41 degrees C per 100 J kg(-1) of CAPE for stratiform precipitation (with variation of 12 %). After removing the impacts of CAPE on PTT, dust aerosols led to an increase in PTT0, at a rate of +4.19 degrees C per unit aerosol optical depth (AOD) for deep convective precipitation and at a rate of +0.35 degrees C per unit AOD for stratiform precipitation. This study showed clear evidence that meteorological conditions and aerosol conditions combine to impact the vertical development of precipitation clouds. A quantitative estimation of the sensitivity of PTT to CAPE and dust was also provided.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000936769200001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273840
作者单位	Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; University of Quebec; University Quebec Abitibi-Temiscamingue
推荐引用方式 GB/T 7714	Zhu, Hongxia,Li, Rui,Yang, Shuping,et al. The impacts of dust aerosol and convective available potential energy on precipitation vertical structure in southeastern China as seen from multisource observations[J],2023,23(4):17.
APA	Zhu, Hongxia,Li, Rui,Yang, Shuping,Zhao, Chun,Jiang, Zhe,&Huang, Chen.(2023).The impacts of dust aerosol and convective available potential energy on precipitation vertical structure in southeastern China as seen from multisource observations.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(4),17.
MLA	Zhu, Hongxia,et al."The impacts of dust aerosol and convective available potential energy on precipitation vertical structure in southeastern China as seen from multisource observations".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.4(2023):17.