Occurrence, liquid water content, and fraction of supercooled water clouds from combined CALIOP/IIR/MODIS measurements

dc.contributor.authorHu, Yongxiang
dc.contributor.authorRodier, Sharon
dc.contributor.authorXu, Kuan-man
dc.contributor.authorSun, Wenbo
dc.contributor.authorHuang, Jianping
dc.contributor.authorLin, Bing
dc.contributor.authorZhai, Peng-Wang
dc.contributor.authorJosset, Damien
dc.date.accessioned2022-06-17T17:55:22Z
dc.date.available2022-06-17T17:55:22Z
dc.date.issued2010-10-07
dc.description.abstractThe CALIOP depolarization measurements, combined with backscatter intensity measurements, are effective in discriminating between water clouds and ice clouds. The same depolarization measurements can also be used for estimating liquid water content information. Using cloud temperature information from the collocated infrared imaging radiometer measurements and cloud water paths from collocated MODIS measurements, this study compiles global statistics of the occurrence frequency, liquid water content, liquid water path, and their temperature dependence. For clouds with temperatures between −40°C and 0°C, the liquid phase fractions and liquid water paths are significantly higher than the ones from previous studies using passive remote sensing measurements. At midlatitudes, the occurrence of liquid phase clouds at temperatures between −40°C and 0°C depends jointly on both cloud height and cloud temperature. At high latitudes, more than 95% of low-level clouds with temperatures between −40°C and 0°C are water clouds. Supercooled water clouds are mostly observed over ocean near the storm-track regions and high-latitude regions. Supercooled water clouds over land are observed in the Northern Hemisphere over Europe, East Asia, and North America, and these are the supercooled water clouds with highest liquid water contents. The liquid water content of all supercooled water clouds is characterized by a Gamma (Γ) distribution. The mode values of liquid water content are around 0.06 g/m3 and are independent of cloud temperature. For temperatures warmer than −15°C, mean value of the liquid water content is around 0.14 g/m3. As the temperature decreases, the mean cloud liquid water content also decreases. These results will benefit cloud models and cloud parameterizations used in climate models in improving their ice-phase microphysics parameterizations and the aviation hazard forecast.en_US
dc.description.sponsorshipThis work is supported by the NASA radiation science program and CALIPSO project. The manuscript benefited from Mark Vaughan's editorial support. The authors want to also thank Dr. Hal Maring of NASA Headquarters for the discussions and support.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2009JD012384en_US
dc.format.extent13 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2lgdg-lxe3
dc.identifier.citationYongxiang Hu et al. "Occurrence, liquid water content, and fraction of supercooled water clouds from combined CALIOP/IIR/MODIS measurements". Journal of Geophysical Research: Atmospheres 115 (D4) (07 October 2010) https://doi.org/10.1029/2009JD012384.en_US
dc.identifier.urihttps://doi.org/10.1029/2009JD012384
dc.identifier.urihttp://hdl.handle.net/11603/24983
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology (JCET)
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleOccurrence, liquid water content, and fraction of supercooled water clouds from combined CALIOP/IIR/MODIS measurementsen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0003-4695-5200en_US

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