AIRS Profiles Impact HRRRAK Analysis

SPoRT has been collaborating with Don Morton and Kayla Harrison at the University of Alaska-Fairbanks to bring AIRS profile data into the High-Resolution Rapid Refresh for Alaska (HRRRAK), which is being developed for operational use at Alaska Region National Weather Service Offices.  In this research activity, SPoRT provided AIRS profile observations in PREPBUFR format for assimilation into the Gridpoint Statistical Interpolation (GSI) used to initialize the HRRRAK.  The following figures show the impact of the AIRS profile data on the GSI analysis.

1000 hPa analysis increment of conventional observations assimilated into HRRRAK at 0000 UTC on 20 August 2011

1000 hPa analysis increment of conventional observations and AIRS profiles assimilated into HRRRAK at 0000 UTC on 20 August 2011

 

It is clear that the assimilation of both conventional observations and AIRS profiles has a larger impact on the analysis than assimilation of conventional observations alone at this time for this pressure level.  More work will be done to determine the forecast impact when the HRRRAK is initialized with each of these analyses and the forecasts are compared to in situ observations of sensible weather parameters.

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