"Cloud and Rainfall Observations using Microwave Radiometer Data and A-priori Constraints" Christian Kummerow and Fang Wang Colorado State University
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1 "Cloud and Rainfall Observations using Microwave Radiometer Data and A-priori Constraints" Christian Kummerow and Fang Wang Colorado State University ECMWF-JCSDA Workshop Reading, England June 16-18, 2010
2 Outline Briefly review the TRMM and GPM Missions Describe the common database of cloud structures being developed for the passive microwave algorithms associated with these missions. Review rainfall retrieval capabilities and impact of a-priori cloud profile database information Compare ECMWF rainfall analysis to retrieved rainfall and relate differences to the a-priori information. 2
3 Tropical Rainfall Measuring Mission (TRMM) TRMM Sensors Precipitation radar (PR): 13.8 GHz 4.3 km footprint 0.25 km vertical res. 215 km swath Microwave radiometer (TMI): 10.7, 19.3, 21.3, GHz (dual polarized except for 21.3 V-only) 10x7 km FOV at 37 GHz 760 km swath Visible/infrared radiometer (VIRS): 0.63, 1.61, 3.75, 10.8, and 12 :m at 2.2 km resolution Lightning Imaging Sensor (LIS ) Cloud & Earth Radiant Energy System (CERES) Nov launch, 35 inclination; 402 km 5
4 TRMM radar retrieval 6
5 Radiometer retrieval - V6 7
6 Rainfall Detection Errors Impact on TMI/PR Differences 11
7 Rainfall Bias Removal Based on Column Water Vapor 13
8 Cloud Profiles Partitioned by TPW 14
9 The GPM Concept NASA/JAXA contribute Core Satellite Precipitation Physics GPM Core Satellite carries: - a dual-frequency radar & - a passive microwave imager with highfrequency capabilities Everyone contributes constellation of dedicated and operational PMW radiometers for frequent sampling Philosophy is to use Core satellite to build a- priori database of observed profiles that less capable sensors can exploit in their algorithms 16
10 Available Microwave Imagers Data Availability F08 SSM/I F10 SSM/I F11 SSM/I F13 SSM/I F14 SSM/I F15 SSM/I F16 SSMIS F17 SSMIS F18 SSMIS TRMM TMI EOS AQUA AMSR-E Coriolis WindSat Satellite/Sensor
11 Radar/radiometer algorithms define the a-priori database. Reflectivity profile Assumptions: rain DSD ice density Cloud Water Radiative Transfer Modify assumptions Consistent with SRT PIA and Tbs? Y Rain Profile N Surface reflection Obs Tbs
12 Retrieval of Precipitation Parameters Ice layer: contributes to scattering at 85 and 37 GHz Melting layer: strongly contributes to emission and radar attenuation Cloud water, water vapor: relatively weak sources of emission and attenuation Rain layer: contributes to emission and radar attenuation
13 Database Adjustments 19 GHz differences after Cloud water adjustment 19 GHz differences after DSD modification Original Tb differences 29
14 Radar/Radiometer Combined Algorithm Adjustment of DSD
15 Bayesian Inversion TRMM Radar & Model Database TB model #1 TB observed TB model #2 ~10 km TB model #3 P ( R T ) P( R) P( T R) b b 31
16 GPROF w. Empirical Database Hurricane Floyd September 13, 1999 GPROF 2008 GPROF TRMM radar 32
17 ECMWF Assimilated Pixels (SSMI) 37
18 ECMWF Assimilated Pixels (SSMI) 38
19 Database, 1st guess, analysis and retrieved rainfall Pixel #1 39
20 Retrieval and Model Biases Pixel #1 Tb biases 19V 19H 22V 37V 37H 85V 85H GPROF maximum likelihood ECMWF 1DVAR First Guess (1.706) (5.546) (-0.246) (4.704) (6.446) (3.064) (5.362) ECMWF 1DVAR Analysis (-0.192) (2.067) ) (1.182) (-0.447) (0.688) (-0.842) 40
21 Database, 1st guess, analysis and retrieved rainfall Pixel #5 43
22 Retrieval and Model Biases Pixel #5 Tb biases 19V 19H 22V 37V 37H 85V 85H GPROF maximum likelihood ECMWF 1DVAR First Guess ( ) ( ) (-7.899) (0.218) ( ) (41.055) (47.649) ECMWF 1DVAR Analysis (-0.160) (-1.866) (-0.499) (4.305) (6.932) (12.611) (19.509) 44
23 Database, 1st guess, analysis and retrieved rainfall Pixel #7 45
24 Retrieval and Model Biases Pixel #7 Tb biases 19V 19H 22V 37V 37H 85V 85H GPROF maximum likelihood ECMWF 1DVAR First Guess (35.615) (64.634) (11.749) (29.608) (64.657) ( ) ( ) ECMWF 1DVAR Analysis (23.087) (40.785) (8.770) (34.158) (64.456) (-1.355) (6.925) 46
25 47
26 Conclusions The a-priori databases constructed from radar/radiometer (and potentially other sensors by algorithm developers) also serves as a nice tool to verify 1D cloud schemes use 48
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