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contributor authorShupe, Matthew D.
contributor authorTurner, David D.
contributor authorZwink, Alexander
contributor authorThieman, Mandana M.
contributor authorMlawer, Eli J.
contributor authorShippert, Timothy
date accessioned2017-06-09T16:50:48Z
date available2017-06-09T16:50:48Z
date copyright2015/07/01
date issued2015
identifier issn1558-8424
identifier otherams-75195.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4217504
description abstractloud phase and microphysical properties control the radiative effects of clouds in the climate system and are therefore crucial to characterize in a variety of conditions and locations. An Arctic-specific, ground-based, multisensor cloud retrieval system is described here and applied to 2 yr of observations from Barrow, Alaska. Over these 2 yr, clouds occurred 75% of the time, with cloud ice and liquid each occurring nearly 60% of the time. Liquid water occurred at least 25% of the time, even in winter, and existed up to heights of 8 km. The vertically integrated mass of liquid was typically larger than that of ice. While it is generally difficult to evaluate the overall uncertainty of a comprehensive cloud retrieval system of this type, radiative flux closure analyses were performed in which flux calculations using the derived microphysical properties were compared with measurements at the surface and the top of the atmosphere. Radiative closure biases were generally smaller for cloudy scenes relative to clear skies, while the variability of flux closure results was only moderately larger than under clear skies. The best closure at the surface was obtained for liquid-containing clouds. Radiative closure results were compared with those based on a similar, yet simpler, cloud retrieval system. These comparisons demonstrated the importance of accurate cloud-phase and cloud-type classification, and specifically the identification of liquid water, for determining radiative fluxes. Enhanced retrievals of liquid water path for thin clouds were also shown to improve radiative flux calculations.
publisherAmerican Meteorological Society
titleDeriving Arctic Cloud Microphysics at Barrow, Alaska: Algorithms, Results, and Radiative Closure
typeJournal Paper
journal volume54
journal issue7
journal titleJournal of Applied Meteorology and Climatology
identifier doi10.1175/JAMC-D-15-0054.1
journal fristpage1675
journal lastpage1689
treeJournal of Applied Meteorology and Climatology:;2015:;volume( 054 ):;issue: 007
contenttypeFulltext


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