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Large Surface Radiative Forcing from Topographic Blowing Snow Residuals Measured in the High Arctic at Eureka : Volume 9, Issue 6 (16/03/2009)

By Lesins, G.

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Book Id: WPLBN0003990121
Format Type: PDF Article :
File Size: Pages 16
Reproduction Date: 2015

Title: Large Surface Radiative Forcing from Topographic Blowing Snow Residuals Measured in the High Arctic at Eureka : Volume 9, Issue 6 (16/03/2009)  
Author: Lesins, G.
Volume: Vol. 9, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Drummond, J. R., Bourdages, L., Duck, T. J., Walden, V. P., Eloranta, E. W., & Lesins, G. (2009). Large Surface Radiative Forcing from Topographic Blowing Snow Residuals Measured in the High Arctic at Eureka : Volume 9, Issue 6 (16/03/2009). Retrieved from http://community.ebooklibrary.org/


Description
Description: Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada. Ice crystals, also known as diamond dust, are suspended in the boundary layer air under clear sky conditions during most of the Arctic winter in Northern Canada. Occasionally ice crystal events can produce significantly thick layers with optical depths in excess of 2.0 even in the absence of liquid water clouds. Four case studies of high optical depth ice crystal events at Eureka in the Nunavut Territory of Canada during the winter of 2006/07 are presented. They show that the measured ice crystal surface infrared downward radiative forcing ranged from 8 to 36 W m−2 in the wavelength band from 5.6 to 20 μm for 532 nm optical depths ranging from 0.2 to 1.7. MODIS infrared and visible images and the operational radiosonde wind profile were used to show that these high optical depth events were caused by surface snow being blown off 600 to 800 m high mountain ridges about 20 to 30 km North-West of Eureka and advected by the winds towards Eureka as they settled towards the ground within the highly stable boundary layer. This work presents the first study that demonstrates the important role that surrounding topography plays in determining the occurrence of high optical depth ice crystal events from residual blowing snow that becomes a source of boundary layer ice crystals distinct from the classical diamond dust phenomenon.

Summary
Large surface radiative forcing from topographic blowing snow residuals measured in the High Arctic at Eureka

Excerpt
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