气候变化领域集成服务门户(CCPortal): Two-Point Mixing; Buoyancy Sorting; and Updraft Dilution in the RACORO Campaign

CCPortal

DOI	10.1029/2020GL090674
	Two-Point Mixing; Buoyancy Sorting; and Updraft Dilution in the RACORO Campaign
	Wei X.; Chan P.W.; Kuang Z.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	Aircraft measurements of shallow cumulus cases from the Routine Atmospheric Radiation Measurement (ARM) Aerial Facility (AAF) Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) campaign are studied in a transformed Paluch diagram. Previous studies have interpreted samples in Paluch diagrams in terms of two-point mixing and buoyancy sorting. The two-point mixing behavior is frequently seen in the RACORO observations and can be unambiguously distinguished from buoyancy sorting. The latter is not found in the RACORO observations and is also rare in a large-eddy simulation (LES) of a RACORO case. As opposed to often assumed gradual dilution of updrafts, around half of the instances of two-point mixing show no clear evidence of updraft dilution. We also find substantial spread in the properties of parcels that have adjusted to their level of neutral buoyancy and that a LES with horizontally homogeneous surface underestimates this spread. The inclusion of surface heterogeneity in the LES improves the agreement of its horizontal moisture variations with the aircraft measurements. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Aircraft; Antennas; Atmospheric radiation; Large eddy simulation; Mixing; Aircraft measurement; Atmospheric radiation measurements; Homogeneous surfaces; Mixing behaviors; Moisture variation; Neutral buoyancy; Shallow cumulus; Surface heterogeneities; Buoyancy; airborne survey; buoyancy; cloud cover; cumulus; dilution; mixing; moisture content; updraft; water depth
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169346
作者单位	Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Now at College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States
推荐引用方式 GB/T 7714	Wei X.,Chan P.W.,Kuang Z.. Two-Point Mixing; Buoyancy Sorting; and Updraft Dilution in the RACORO Campaign[J],2020,47(23).
APA	Wei X.,Chan P.W.,&Kuang Z..(2020).Two-Point Mixing; Buoyancy Sorting; and Updraft Dilution in the RACORO Campaign.Geophysical Research Letters,47(23).
MLA	Wei X.,et al."Two-Point Mixing; Buoyancy Sorting; and Updraft Dilution in the RACORO Campaign".Geophysical Research Letters 47.23(2020).