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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, D24104, doi:10.1029/2005JD007039, 2006

A new clear-sky downward longwave radiative flux parameterization for Arctic areas based on rawinsonde data

Xin Jin

Centre for Earth Observation Science (CEOS), Faculty of Environment, University of Manitoba, Winnipeg, Manitoba, Canada


David Barber

Centre for Earth Observation Science (CEOS), Faculty of Environment, University of Manitoba, Winnipeg, Manitoba, Canada


Tim Papakyriakou

Centre for Earth Observation Science (CEOS), Faculty of Environment, University of Manitoba, Winnipeg, Manitoba, Canada


Abstract

An improved downward longwave clear-sky radiative flux (LWd) parameterization was developed and evaluated with field measurements collected in two projects: the Collaborative Interdisciplinary Cryospheric Experiment in 2000 and the Canadian Arctic Shelf Exchange Study. The 722 operational upper air soundings collected in Resolute Bay in 2000 were used to develop this scheme. After comparing this new method with 11 previous schemes we conclude that our new scheme has the smallest mean bias error: −0.8 Wm−2 and −0.7 Wm−2 in two projects, while all of the schemes have similar correlation coefficients: 0.96 and 0.91. Our new method has a varying root-mean square error, depending on the seasonal background of sampling period; it decreases with the extension of the sampling period and the inclusion of multiple sampling seasons.

Received 28 December 2005; accepted 31 July 2006; published 19 December 2006.

Keywords: longwave flux; Arctic; radiosonde.

Index Terms: 3349 Atmospheric Processes: Polar meteorology; 3359 Atmospheric Processes: Radiative processes; 3355 Atmospheric Processes: Regional modeling.

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Citation: Jin, X., D. Barber, and T. Papakyriakou (2006), A new clear-sky downward longwave radiative flux parameterization for Arctic areas based on rawinsonde data, J. Geophys. Res., 111, D24104, doi:10.1029/2005JD007039.