FTIPP FCLIM / TRMM / IRP Precipitation Pentads

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Presentation transcript:

FTIPP FCLIM / TRMM / IRP Precipitation Pentads aboaf (A bit of Acronym Forensics)

FCLIM FEWS Net Climatology Famine Early Warning Systems Network

TRMM Tropical Rainfall Measuring Mission 3B42 V6, RT The combined instrument rain calibration algorithm (3B-42) uses an optimal combination of 2B-31, 2A-12, SSMI, AMSR and AMSU precipitation estimates (referred to as HQ), to adjust IR estimates from geostationary IR observations. Near-global estimates are made by calibrating the IR brightness temperatures to the HQ estimates. The 3B-42 estimates are scaled to match the monthly rain gauge analyses used in 3B-43. 0.25 Deg 3-hourly 50N - 50S 1998-today

IR CPC IR Brightness Temperatures 4km 1/2-hourly 60N - 60S 2000-today The Climate Prediction Center/NCEP/NWS is now making available globally-merged (60N-60S) pixel-resolution IR brightness temperature data (equivalent blackbody temps), merged from all available geostationary satellites (GOES-8/10, METEOSAT-7/5 & GMS). The availability of data from METEOSAT-5, which is located at 63E at the present time, yields a unique opportunity for total global (60N-60S) coverage. 4km 1/2-hourly 60N - 60S 2000-today

IRP - IR derived Precipitation Basic idea, IR ~ Temperature Cold ~ Clouds Clouds ~ Precip So,  IR ~  Precip

IRP in the W. Hemisphere For each 1/4 degree pixel and pentad (1-72) for given month (2001-2009) for given threshold (260-300K) regress (TRMM daily rain rate) onto (%IR below TH) Find the TH with the best correlation, that becomes your model for that point Apply this to .05 degree IR data to get .05 deg IRP

FTIPP Calculations FTIPP = FCLIM * (%TRMM + %IRP)/2 %TRMM = (TRMM.data + ) / (TRMM.clim + ) %IRP = (IRP.data + ) / (IRP.clim + )

Other things… Converting monthly FCLIM to pentads How to use TRMM-RT before V6 available How to validate De-artifacting From development to operational Improve FTIPP using station data FTIPP on other continents Get into EWX