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The Global Distribution of Cloud Gaps in CALIPSO Data

Kiemle, Christoph and Ehret, Gerhard and Kawa, S. R. and Browell, Edward V. (2015) The Global Distribution of Cloud Gaps in CALIPSO Data. Journal of Quantitative Spectroscopy and Radiative Transfer, 153, pp. 95-101. Elsevier. ISSN 0022-4073

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleListURL&_method=list&_ArticleListID=-827440411&_sort=r&_st=13&view=c&md5=ada9f6e46f09775fe43faf4b7580eb06&searchtype=a

Abstract

Future space-borne lidar missions are foreseen to measure global concentrations of methane, carbon dioxide and aerosols with high sensitivity and to relate the concentrations to their surface sources and sinks. Therefore, full visibility down to the surface is required. We use CALIPSO (Cloud- Aerosol Lidar and Infrared Pathfinder Satellite Observations) level-2 total atmosphere cloud optical depths for the full year 2007 to assess the global and seasonal variability of such cloud-free regions with high accuracy and spatial resolution (5 km), both to contribute to an improved scientific understanding of their distribution and to identify clear regions where the above missions are expected to significantly add to the current global observation system. The global length distribution of cloudy and of cloud-free regions is strongly skewed towards a high probability of occurrence of small lengths and roughly follows a power law with exponent -5/3 up to scales of about 1000 km. Belts with extended cloud-free regions span along the subtropics, seasonally interrupted by monsoon systems. In winter large parts of the Arctic are less cloudy than in summer. Over regions with intense anthropogenic or biogenic aerosol and greenhouse gas emissions, low cloud cover is found in India and Northeast China in winter and in Amazonia, the USA, and Central Asia in summer. Here, favorable conditions for key contributions by the next generation of remote sensing missions are encountered.

Item URL in elib:https://elib.dlr.de/93053/
Document Type:Article
Additional Information:Highlights  The global distribution of cloud-free regions is assessed using CALIPSO lidar data.  The CALIPSO level-2 data have high accuracy at low cloud optical depths.  The full year 2007 cloud optical depths are used with a spatial resolution of 5 km.  The cloud cover and cloud gap length pdfs roughly follow a power law with exponent -5/3.  Regions favorable for measurements by future space lidar missions are identified.
Title:The Global Distribution of Cloud Gaps in CALIPSO Data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kiemle, ChristophDLR IPAUNSPECIFIED
Ehret, GerhardDLR, IPAUNSPECIFIED
Kawa, S. R.NASA GoddardUNSPECIFIED
Browell, Edward V.NASA Langley Research Center, Hampton, VA, USAUNSPECIFIED
Date:2015
Journal or Publication Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:153
Page Range:pp. 95-101
Publisher:Elsevier
Series Name:ISALSaRS'13 special issue
ISSN:0022-4073
Status:Published
Keywords:CALIPSO; cloud-free regions; space lidar missions; cloud length distribution
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Kiemle, Dr.rer.nat. Christoph
Deposited On:05 Dec 2014 10:06
Last Modified:06 Sep 2019 15:28

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