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.