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DOI	10.1016/j.atmosres.2020.104924
	Vertical profiles of droplet size distributions derived from cloud-side observations by the research scanning polarimeter: Tests on simulated data
	Alexandrov M.D.; Miller D.J.; Rajapakshe C.; Fridlind A.; van Diedenhoven B.; Cairns B.; Ackerman A.S.; Zhang Z.
发表日期	2020
ISSN	0169-8095
卷号	239
英文摘要	The Research Scanning Polarimeter (RSP) is an airborne along-track scanner measuring the polarized and total reflectances with high angular resolution. It allows for accurate characterization of liquid water cloud droplet sizes using the rainbow structure in the polarized reflectance. RSP's observations also provide constraints on the cumulus cloud's 2D cross section, yielding estimates of its geometric shape. In this study for the first time we evaluate the possibility to retrieve vertical profiles of microphysical characteristics along the cloud side by combining these micro- and macrophysical retrieval methods. First we constrain cloud's geometric shape, then for each point on the bright side of its surface we collect data from different scans to obtain the multi-angle polarized reflectance at that point. The rainbow structures of the reflectances from multiple points yield the corresponding droplet size distributions (DSDs), which are then combined into vertical profiles. We present the results of testing the proposed profiling algorithm on simulated data obtained using large eddy simulations and 3D radiative transfer computations. The virtual RSP measurements were used for retrieval of DSD profiles, which then were compared to the actual data from the LES-model output. A cumulus congestus cloud was selected for these tests in preparation for analysis of real measurements made during the Cloud, Aerosol and Monsoon Processes Philippines Experiment (CAMP2Ex). We demonstrate that the use of the non-parametric Rainbow Fourier Transform (RFT) allows for adequate retrieval of the complex altitude-dependent bimodal structure of cloud DSDs. © 2020 Elsevier B.V.
英文关键词	Cloud droplet size; Clouds; Polarization; Radiometry; Remote sensing; Vertical profile
学科领域	Clouds; Large eddy simulation; Polarimeters; Polarization; Radiometry; Reflection; Remote sensing; Size distribution; Cloud droplets; Cumulus congestus clouds; Droplet size distributions; High angular resolutions; Polarized reflectances; Research scanning polarimeters; Transfer computation; Vertical profile; Drops
语种	英语
scopus关键词	Clouds; Large eddy simulation; Polarimeters; Polarization; Radiometry; Reflection; Remote sensing; Size distribution; Cloud droplets; Cumulus congestus clouds; Droplet size distributions; High angular resolutions; Polarized reflectances; Research scanning polarimeters; Transfer computation; Vertical profile; Drops
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120407
作者单位	Department of Applied Physics and Applied Mathematics, Columbia University, 2880 Broadway, New York, NY 10025, United States; NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, United States; NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Cir, Baltimore, MD 21250, United States; Center for Climate Systems Research, Columbia University, 2880 Broadway, New York, NY 10025, United States
推荐引用方式 GB/T 7714	Alexandrov M.D.,Miller D.J.,Rajapakshe C.,et al. Vertical profiles of droplet size distributions derived from cloud-side observations by the research scanning polarimeter: Tests on simulated data[J],2020,239.
APA	Alexandrov M.D..,Miller D.J..,Rajapakshe C..,Fridlind A..,van Diedenhoven B..,...&Zhang Z..(2020).Vertical profiles of droplet size distributions derived from cloud-side observations by the research scanning polarimeter: Tests on simulated data.Atmospheric Research,239.
MLA	Alexandrov M.D.,et al."Vertical profiles of droplet size distributions derived from cloud-side observations by the research scanning polarimeter: Tests on simulated data".Atmospheric Research 239(2020).