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The Geosynchronous Microwave Sounder-Imager



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The Geosynchronous Microwave GEM Sounder Imager Albin J Gasiewski NOAA Environmental Technology Laboratory Boulder CO USA David H Staelin Massachusetts Institute of Technology Cambridge MA USA Bizzarro Bizzarri CNR Istituto Scienze dell Atmosfera e del Clima ISAC Rome Italy ITSC 12 2002 Feb 27 Mar 5 2002 Lorne Australia GMSWG Concept Summary Baseline system using 54 118 183 380 and 424 GHz with 2meter aperture Nodding Morphing Subreflector Space Calibration Tube 16 km equatorial resolution 11 km using oversampling above 2 5 km altitude at highest frequency channels 54GHz Feeds Receivers The 380 and 424 GHz channels selected to map precipitation through most optically opaque clouds at sub hourly intervals Temperature and humidity sounding channels penetrate clouds sufficiently to drive NWP models with hourly data Estimated 2002 costs 31M non recurring plus 28M unit ITSC 12 2002 3 Thick Composite Reflector Elevation Motor Compensator Backup Structure Azimuth Motor Compensator Geosynchronous Microwave Sounder Working Group Chair D H Staelin MIT Feb 27 Mar 5 2002 Lorne Australia GEM Spectral Selection ITSC 12 2002 Feb 27 Mar 5 2002 Lorne Australia GEM Vertical Response Clear air incemental weighting functions O2 118 750 GHz 424 763 GHz AMSU 5 MM H2 O 183 310 GHz 380 197 340 Klein Gasiewski JGR ATM July 2000 ITSC 12 2002 Feb 27 Mar 5 2002 Lorne Australia GEM Probing Depths Mari Midlatitude 30 60o annual atmosphere Nadir view 1 optical depth ITSC 12 2002 Feb 27 Mar 5 2002 2 optical depths Lorne Australia GEM Spatial Resolution 3 dB best resolution degrades by 1 3x to 21 km at 50o latitude Oversampling by 2x above Nyquist expected to recover 30 40 of this lost resolution for high SNR cases ITSC 12 2002 Feb 27 Mar 5 2002 Lorne Australia GEM Simulated Imagery MM5 Reisner 5 phase simulation of Hurricane Opal 1995 Nested 5 km inner grid with iterative multistream scatteringbased RT model 424 763 4 0 GHz channel ITSC 12 2002 Feb 27 Mar 5 2002 Lorne Australia GEM Simulated



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