气候变化领域集成服务门户(CCPortal): Microphysical process of precipitating hydrometeors from warm-front mid-level stratiform clouds revealed by ground-based lidar observations

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DOI	10.5194/acp-21-17649-2021
	Microphysical process of precipitating hydrometeors from warm-front mid-level stratiform clouds revealed by ground-based lidar observations
	Yi Y.; Yi F.; Liu F.; Zhang Y.; Yu C.; He Y.
发表日期	2021
ISSN	1680-7316
起始页码	17649
结束页码	17664
卷号	21 期号:23
英文摘要	Mid-level stratiform precipitations during the passage of warm fronts were detailedly observed on two occasions (light and moderate rain) by a 355 nm polarization lidar and water vapor Raman lidar, both equipped with waterproof transparent roof windows. The hours-long precipitation streaks shown in the lidar signal (X) and volume depolarization ratio (δv) reveal some ubiquitous features of the microphysical process of precipitating hydrometeors. We find that for the light-rain case precipitation that reaches the surface begins as ice-phase-dominant hydrometeors that fall out of a shallow liquid cloud layer at altitudes above the 0°C isotherm level, and the depolarization ratio magnitude of falling hydrometeors increases from the liquid-water values (δv<0.09) to the ice/snow values (δv>0.20) during the first 100-200 m of their descent. Subsequently, the falling hydrometeors yield a dense layer with an ice/snow bright band occurring above and a liquid-water bright band occurring below (separated by a lidar dark band) as a result of crossing the 0°C level. The ice/snow bright band might be a manifestation of local hydrometeor accumulation. Most falling raindrops shrink or vanish in the liquid-water bright band due to evaporation, whereas a few large raindrops fall out of the layer. We also find that a prominent δv peak (0.10-0.40) always occurs at an altitude of approximately 0.6 km when precipitation reaches the surface, reflecting the collision-coalescence growth of falling large raindrops and their subsequent spontaneous breakup. The microphysical process (at ice-bright-band altitudes and below) of moderate rain resembles that of the light-rain case, but more large-sized hydrometeors are involved. © 2021 Yang Yi et al.
语种	英语
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/246398
作者单位	School of Electronic Information, Wuhan University, Wuhan, 430072, China; Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, 430072, China; State Observatory for Atmospheric Remote Sensing, Wuhan, 430072, China
推荐引用方式 GB/T 7714	Yi Y.,Yi F.,Liu F.,et al. Microphysical process of precipitating hydrometeors from warm-front mid-level stratiform clouds revealed by ground-based lidar observations[J],2021,21(23).
APA	Yi Y.,Yi F.,Liu F.,Zhang Y.,Yu C.,&He Y..(2021).Microphysical process of precipitating hydrometeors from warm-front mid-level stratiform clouds revealed by ground-based lidar observations.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(23).
MLA	Yi Y.,et al."Microphysical process of precipitating hydrometeors from warm-front mid-level stratiform clouds revealed by ground-based lidar observations".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.23(2021).