92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Monday, 23 January 2012
Tropospheric Impacts of Assimilating Infrared Water Vapor Radiances in the NCEP GFS
Hall E (New Orleans Convention Center )
James A. Jung, CIMSS/Univ. of Wisconsin, Camp Springs, MD; and J. F. Le Marshall

Assimilation techniques are currently being developed to further enhance the methodology to exploit the hyperspectral and broadband infrared water vapor channels in Numerical Weather Prediction. There are several problems which must be resolved in using these channels. In general, the non-linearity of the water vapor channels makes them difficult to assimilate. Channels which have significant dependencies on water vapor in the stratosphere are not yet used by most NWP centers. We have conducted a number of experiments focused on using water vapor channels. Our focus is on identifying and quantifying changes occurring in the troposphere. We will show humidity and temperature changes associated with the assimilation of these channels and look at the influence these changes have on subsequent forecast fields.

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