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The Effect of using Digital Satellite Imagery in the LAPS Moisture ...
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Short Description: nationally disseminated data sources is digital satellite imagery. The Forecast Systems Labora-. tory (FSL) has been receiving 8-bit satellite data for the ...
Content Inside: The Effect of using Digital Satellite Imagery in the LAPS Moisture Analysis Daniel Birkenheuer1 NOAA Forecast Systems Laboratory, Boulder Colorado ABSTRACT The Local Analysis and Prediction System (LAPS) analyzes three-dimensional moisture as one component of its system. This paper describes the positive impact that simple 8-bit, remapped, routinely available imagery have on the LAPS moisture analysis above 500 hPa. A variational method adjusts the LAPS moisture analysis by minimizing differences between forward model-computed radiances and radiances from Advanced Weather Interactive Processing system (AWIPS) image-grade data from Geostationary Operational Environmental Satellite (GOES-8). The three infrared (IR) channels used in the analysis will be routinely available to AWIPS workstations every 15 min. This tech- nique improves LAPS upper-level dewpoint, reducing dewpoint temperature bias and root-mean-square (RMS) error on the order of 0.5 and 1.5 K respectively as compared to Denver Radiosonde Observation (RAOB) data. Furthermore, it strongly exemplifies the objective analysis benefit of image-grade data, in addition to its well-known subjective utility. 1.Joint collaboration with the Cooperative Institute for Research in the Atmosphere, Fort Collins, Colorado Corresponding author address: Dr. Daniel Birkenheuer, CIRA/NOAA/ERL/FSL, R/E/FS1, 325 Broadway, Boulder, CO 80303 Page 1 Document OutlineTable 1: Error Statistics April - August 1996Table 2: Analysis impact over Denver 1200 UTC 14 May 1997
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