Mircea Grecu, Lin Tian, Bill Olson, and Simone Tanelli & GPM Radar ...
Mircea Grecu, Lin Tian, Bill Olson, and Simone Tanelli & GPM Radar ...
Mircea Grecu, Lin Tian, Bill Olson, and Simone Tanelli & GPM Radar ...
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<strong>Mircea</strong> <strong>Grecu</strong>, <strong>Lin</strong> <strong>Tian</strong>, <strong>Bill</strong> <strong>Olson</strong>, <strong>and</strong> <strong>Simone</strong> <strong>Tanelli</strong>&<strong>GPM</strong> <strong>Radar</strong> <strong>and</strong> Combined Algorithm Teams
<strong>GPM</strong> “Core” Launch: July 2013Dual-wavelength Precipitation <strong>Radar</strong>(DPR)freq: 13.6 GHz (Ku) <strong>and</strong> 35.5 GHz (Ka)<strong>GPM</strong> Microwave Imager (GMI)freq: 10.7, 18.7, 23.8, 36.5, 89.0,165.5, 183±8, <strong>and</strong> 183±3 GHznew <strong>GPM</strong> channels in cyan.
DPR footprintsGMI footprintsDPR swath sectionfreq. 10.7, 18.7, 23.8, 36.5, 89.0, 165.5, 183.3±8, 183.3±3 GHzresol. 26, 15, 12, 11, 6, 6, 6, 6 km
x iy = f(x)y iy obsy obs ; ! noiseix i ’ x i ’
analysis ofp, T, q, <strong>and</strong>CLW profilesDPR Z Ku <strong>and</strong> Z Kainitial ensemble ofq, CLW profiles;calc. atten. at Ku, Kasave estimates <strong>and</strong>uncertaintiesensemble filter N W , D o ,q, CLW profiles <strong>and</strong>emissivities usingdeconvolved TB GMIOutput is ensemble ofN W , D o , q, CLW profiles<strong>and</strong> emissivitiesconsistent with Z Ku,Ka ,PIA Ku,Ka , <strong>and</strong>deconvolved GMI TB’s.recursivelyensemble filtera priori N W ,D ousing Z Ku,Kause DPR-resolution toconstrain GMI TBdeconvolutionsimulate TB GMIensembles at DPRresolutionGMI TB’sensemble filter N W ,D oprofiles usingPIA Ku,Kaassign T sfc , emissivityensembleto DPR-derivedprofile ensemblesSRT estimates ofPIA Ku <strong>and</strong> PIA Kaanalysis of T sfc ,emissivities (U 10 )
Ku b<strong>and</strong> Only EstimatesEnsemble Kalman Filter !estimates of LWC using!different input:!ALTITUDE [km]ALTITUDE [km]ALTITUDE [km]Ku B<strong>and</strong> APR-2 DataKu + Ka b<strong>and</strong> EstimatesKu + Ka b<strong>and</strong> + Microwave EstimatesALTITUDE [km]SCAN “Truth” INDEXALTITUDE [km]APR-2 data from TC4
Ku-only Ku/Ka-only Ku/Ka + MicrowaveESTIMATED LWC [g m -3 ]TRUE LWC [g m -3 ] TRUE LWC [g m -3 ] TRUE LWC [g m -3 ]Bias (% of mean): -15.1% -5.2% -1.3%RMSE (% of !): 55% 45% 35%Corr. Coef. .78 .85 .91
• “1-D” algorithm ready. Ensemble Kalman approach produces!reasonable estimates & improvement with radiometer channels. !• Current work is on GMI deconvolution step, <strong>and</strong> construction of!"a priori ensembles to constrain estimated parameters.!• To optimize impact of new <strong>GPM</strong> channels, need to ensure!physics & a priori assumptions are realistic. FC data & 1-D testing.!• Full satellite algorithm testing to start mid-2011.!
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