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Finalizing the AMSR -E Rainfall Algorithm GPROF2010. Dave Randel Colorado State University. AMSR-E Science Team Meeting Oxnard, CA 4 -5 September, 2013. GPROF 2010 Algorithm Structure. AME_L2A. AMSR-E, AMSR2. Format Converter. HDFEOS. GPROF 2010 . Version 1 - PowerPoint PPT Presentation
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Finalizing the AMSR-E Rainfall AlgorithmGPROF2010
AMSR-E Science Team MeetingOxnard, CA4-5 September, 2013
Dave RandelColorado State University
GPROF 2010 Algorithm Structure
AME_L2A
AMSR-E, AMSR2
HDFEOS
Format Converter
GPROF 2010
Version 1
• Added Desert and Snow Climatology (Ferraro/Meyers). No land retrievals are performed here.
• Modified AMSR-E radiances for land precipitation screening
thresholds (Ferraro/Meyers) • Modified land precipitation calculation to account for difference of 85
GHz (SSMI/TMI) channels to 89 GHz (AMSR-E) (Ferraro/Meyers)
• Version 1 delivered to MSFC December 2012. Input AMSR-E radiances are L2A.
Version 1 Issue: We were unable to replicate the rain rates between sensors.
GPROF 2010
Version 2 Solution and Improvements
• Reformulated Bayesian retrieval lowered the ‘noise’ by removing database profiles erroneously included in the weighted average.
• Replaced K-Means clustering with ‘homegrown’ clustering routine. PR/TMI 1 year database has 50,000,000 profiles. K-means incorrectly reduced the variability of the profiles in the clustered database.
• Improved the colder temperature simulated profiles for retrievals poleward of 40 degrees.
JAN, APR, JUL, OCT 2007
TMI
AMSR-E
TMIAMSR-E – 1 hr
JAN, APR, JUL, OCT 2007
GPROF 2010 L2A Complete Parameter List
Orbit Header
SatelliteSensorAlgorithm VersionPre Processor VersionOcean DatabaseOriginal fileStart DateCreation DateGranuleMissing DataNum scansNum Pixels
Scan HeaderScan Date and Time
Pixel Data
Latitude, LongitudePixel Status, Screen Flag, Quality FlagLand Ambiguous Flag, Surface TypeOcean Extended DbaseProfile Search RadiusOE Chi Squared TB fit Error Probability of Precipitation Sun Glint AngleFreezing HeightSurface Precipitation (Liquid+ Frozen)Convective PrecipitationSurface Rain (Liquid)Cloud Water PathRain Water PathIce Water Path
Version 2 implemented at CSU for TMI, SSMI, SSMIS, close to final for AMSR-E, expected delivery to MSFC mid-October. Remaining issue: coast retrieval decision.