Combining SMMR and SSM I Data for Time Series Analysis of Central North American Snow Water Equivale.pdf

Combining SMMR and SSM I Data for Time Series Analysis of Central North American Snow Water Equivale.pdf

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Combining SMMR and SSM I Data for Time Series Analysis of Central North American Snow Water Equivale

304 J O U R N A L O F H Y D R O M E T E O R O L O G Y VOLUME 4 Combining SMMR and SSM/I Data for Time Series Analysis of Central North American Snow Water Equivalent C. DERKSEN AND A. WALKER Climate Research Branch, Meteorological Service of Canada, Downsview, Ontario, Canada E. LEDREW Waterloo Laboratory for Earth Observations, Department of Geography, University of Waterloo, Waterloo, Ontario, Canada B. GOODISON Climate Research Branch, Meteorological Service of Canada, Downsview, Ontario, Canada (Manuscript received 8 February 2002, in final form 22 September 2002) ABSTRACT When Special Sensor Microwave Imager (SSM/I) and Scanning Multichannel Microwave Radiometer (SMMR) data are combined, the time series of dual-polarized, multichannel, spaceborne passive microwave brightness temperatures extends from 1978 to the present. The Meteorological Service of Canada (MSC) has developed operational snow water equivalent (SWE) retrieval algorithms for western Canada that have been applied to both SMMR and SSM/I data. Climatological research questions that demand a time series of significant length can now be addressed with passive microwave–derived datasets of this nature. Attention must be given, however, to the impact of the slightly different spatial, temporal, and radiometric characteristics between the SMMR and

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