WA-08-01D Precipitation [And Water and Energy Cycle Integration] led by the International Precipitation Working Group (IPWG) IPWG Co-Chairs: George J. Huffman Science Systems and Applications, Inc. and NASA Goddard Space Flight Center Greenbelt, MD USA Christian Klepp University of Hamburg and Max-Planck Institute for Meteorology Hamburg, Germany Presented by: David Toll NASA Goddard Space Flight Center Greenbelt, MD USA 25 February 2010IGWCO Planning Meeting, New York City, USA 1

Sub-task definition (as given in the Work Plan): Under the guidance of CGMS/IPWG -promote and advance the development and validation of multi-sensor satellite- based precip estimates -including snowfall Inputs from the Precipitation Virtual Constellation (AR-09-02a) will supplement these efforts Scope of the GEO precip activity Integrate satellite data and products with surface observations and numerical model information to provide long-term, fine-scale records of global precip Participate in analyses of the global water and energy cycle (WEC) -explore this crucial element of the global environment -constrain the permissible values of precip by comparison to estimates of the other components The GEO Precip Sub-task 25 February 2010IGWCO Planning Meeting, New York City, USA 2

Or More Graphically We want to get better at turning this TRMM Sat-Gauge (mm/h) 00Z 01 March 2000 Images courtesy GPM (top), George Huffman (bottom) into this 25 February 2010IGWCO Planning Meeting, New York City, USA 3

Current Data Sets Most WEC activities depend on multi-satellite data sets Provides quasi-gobal, consistent coverage over a long period GPCP provides the longest records, at coarse resolution Satellite-Gauge monthly2.5°x2.5°1979-present Pentad (5-day)2.5°x2.5°1979-present One-Degree Daily (1DD)1°x1°October 1996-present -Pentad, 1DD constrained to add up to the monthly “High resolution precipitation products” provide more detail CMORPH0.08°x0.08°December 2002-present GSMaP0.10°x0.10° (NRT October 2007-present) NRL MW/IR0.25°x0.25°2004-present PERSIANN0.25°x0.25°March 2000-present TMPA0.25°x0.25°1998-present (current RT October 2008-present) -the region of coverage is around 50°N-50°S in all cases GPCC provides a consistent, on-going source of global gauge analyses GPCP and TMPA products use monthly gauge data -important bias corrections, but only in gauged regions 25 February 2010IGWCO Planning Meeting, New York City, USA 4

Recent Activities (1/2) Excellent precip datasets depend on excellence at every stage Ongoing precip-relevant satellite constellation, rain gauge network -advocate continuation of “old” platforms (prior DMSP and NOAA platforms, TRMM) -advocate future missions (GPM, MegaTropique) -support CEOS planning Calibration and quality control for input data -IPWG interaction with International TOVS Working Group; NASA/PMM XCAL Timely, open access to data 25 February 2010IGWCO Planning Meeting, New York City, USA 5

Recent Activities (2/2) Excellent precip datasets depend on excellence at every stage (cont.) Development and validation of algorithms -improved GPCC rain gauge analysis -continued improvement in “traditional” passive microwave (GPROF, GSMaP, HOAPS) -work on “high-frequency” passive microwave for snow, cold season use -multi-spectral VIS/IR algorithms (driven by GOES-R, MSG sensors) -Kalman smoother schemes in CMORPH, GSMaP -additional, upgraded inputs for Version 7 TMPA -retrospective CMOPRH processing back to use of the new GPCC analyses in GPCP Version 2.1 Development and validation of numerical analyses -IPWG interaction with Working Group on Numerical Experimentation for parallel validation of observed and numerical precip estimates Dataset archives focused on stable long-term, global, homogeneously processed estimates 25 February 2010IGWCO Planning Meeting, New York City, USA 6

The Future Single-sensor Continued focus on “difficult” situations -snow, cold season -coastal areas -complex terrain Multi-satellite Continued focus on Lagrangian time interpolation Approaches to the “development problem” - precip patterns change between passive microwave overpasses Use submonthly rain gauge data in satellite-gauge combination products Refined schemes for estimating precip errors -develop parameterized multi-scale expressions for bias, RMS, etc. Merged observation-numerical estimates in parallel to observation-only products 25 February 2010IGWCO Planning Meeting, New York City, USA 7

Integration Activities (1/2) There’s a great deal of interaction that just hasn’t been cast in a GEO framework Work with specific users or specific WEC interactions Flood/drought -FEWSNet, H-SAF, IFNet, Mekong River Commission, SERVIR, TRMM flood/landslide alerts -hydrological modelers -the key issue is the sensor-, scale-, and regime-dependent error in the precip products Soil moisture -land-process modelers -soil moisture satellites (SMAP, SMOS) Assimilation of precip data in numerical initialization systems WEC integration; to repeat: explore this crucial element of the global environment constrain the permissible values of precip by comparison to estimates of the other components 25 February 2010IGWCO Planning Meeting, New York City, USA 8

Integration Activities (2/2) GEWEX Radiation Panel (GRP) long-term global observational WEC data sets working to produce an integrated WEC data set -consistent 3-hr, 50-km grid; starting 1980’s NASA Energy and Water Studies (NEWS) funded PI projects integrative cross-cutting focus groups -drought and flood extremes -evaporation and latent heating -WEC climatology -modeling and water cycle prediction Regional-Scale Water Cycle Studies Asian Water Cycle Initiative CEOP Arctic basin hydrological balance 25 February 2010IGWCO Planning Meeting, New York City, USA 9

Concluding Comments Reasonably competent long-term global precip data sets are currently available The greatest uncertainty is in cold-land conditions and early in the record There is a substantial effort at improving the end-to-end provision of such data The utility of the long-term data sets rests on continued launches to replenish the global constellation of precip-relevant satellites Errors at one step in processing usually come back to haunt you at a later step Substantial efforts are underway to examine the WEC GRP, NEWS, and additional efforts Involvement of data producers is key to getting the best results; a startling “discovery” for anyone else is frequently a well-known “feature” to the data producer What more does GEO need to be doing? Improve interaction with additional groups Advocate for the necessary resources (satellites, archive reanalysis activities, etc.) 25 February 2010IGWCO Planning Meeting, New York City, USA 10

Extra Slides 25 February 2010IGWCO Planning Meeting, New York City, USA 11

IPWG was established under CGMS to: Promote standard operational procedures and common software for deriving precipitation estimates from satellites Establish standards for validation and independent verification of precipitation estimates Foster the exchange of data on inter-comparisons of operational precipitation estimates from satellites Stimulate increased international scientific research and development in this field Provide recommendations to national and international agencies regarding the utilization of current and future satellite instruments on both polar and geostationary platforms Encourage regular education and training activities CGMS nominated IPWG to lead the GEO precip subtask, WA-08-01d in 2008 A Word About IPWG 25 February 2010IGWCO Planning Meeting, New York City, USA 12

Interactions with WGNE and GEO IPWG’s validation work is focused through the Program for the Evaluation of High Resolution Precipitation Products (PEHRPP) Includes long-term regional-scale efforts in Australia, Japan, South America, the U.S., Western Europe WGNE invited to submit numerical model estimates for evaluation in PEHRPP and agreed Contributing Centers to date are ECMWF, JMA, Meto-France, NCEP, NRL; GMAO and BOM are expected Data are being released or not according to each Center’s policy IPWG is providing leadership for the GEO precip area CGMS recommended the IPWG Co-Chairs for this role Co-Chair George Huffman is the “point of contact” for WA-08-01d A first task plan was submitted Former Co-Chair Chris Kidd will represent IPWG at the GEO Water Cycle Integration workshop 21 November 2009, ESRIN, Frascati, Italy 25 February 2010IGWCO Planning Meeting, New York City, USA 13

GEWEX Radiation Panel (GRP) Within GEWEX the GRP produces long-term global observational WEC data sets GRP plans to produce an integrated WEC product (probably 3 hr, 50 km) combine all GRP individual products into a single file for use in WEC budget studies -aerosols (GACP) -clouds (ISCCP) -precipitation (GPCP, including rain gauge analysis by GPCC) -surface fluxes (SeaFlux, LandFlux) -surface radiation (SRB) -TOA radiation (CERES) Graphic courtesy William Rossow 25 February 2010IGWCO Planning Meeting, New York City, USA 14

Current GRP Data Sets Graphic courtesy Christian Kummerow (From 2008 report) 250/100 km 25 February 2010IGWCO Planning Meeting, New York City, USA 15

NASA Energy and Water Studies (NEWS) NEWS Challenge: Document and enable improved, observationally-based predictions of water and energy cycle consequences of Earth system variability and change NEWS is intended to be integrative There are lots of connections: Logos courtesy Deborah Belvedere 25 February 2010IGWCO Planning Meeting, New York City, USA 16

NASA Energy and Water Studies (NEWS) NEWS cross-cutting focus groups Drought & Flood Extremes - including water and energy aspects of abrupt climate change Evaporation & Latent Heating - including both land and ocean Energy & Water Cycle Climatology - exploit and influence evolving observing systems -key goal to use uncertainties in individual components to estimate adjustments that create a better “fit” to the WEC as a whole Modeling & Water Cycle Prediction - foster interaction with the global modeling community The goal is big-picture use of the individual P.I. results 25 February 2010IGWCO Planning Meeting, New York City, USA 17

Regional-Scale Water Cycle Studies Asian Water Cycle Initiative Focus on Asia and surrounding waters CEOP Focus on GEWEX Continental-Scale Experiment regions Arctic basin hydrological balance Focus on water budgets of the Arctic basin rivers 25 February 2010IGWCO Planning Meeting, New York City, USA 18

Acronyms 1DDOne-Degree Daily precip product AWCIAsian Water Cycle Initiative BOMBureau of Meteorology, Austraiia CEOSCoordinated Energy and Water Cycle Observations Project CERESClouds and the Earth's Radiant Energy System CGMSCoordinating Group on Meteorological Satellites CMORPHClimate Prediction Center (CPC) Morphing algorithm DMSPDefense Meteorogical Satellite Program ECMWFEuropean Centre for Medium-Range Weather Forcasting FEWSNetFamine Early Warning System Network GACPGEWEX Aerosol Climatology Project GEOGlobal Earth Observations GEWEXGlobal Energy and Water Experiment GMAOGlobal Modeling and Assimilation Office GOES-RGeostationary Operational Environmental Satellite-R Series GPCCGlobal Precipitation Climatology Centre GPCPGlobal Precipitation Climatology Project GPMGlobal Precipitation Measurement mission GPROFGoddard Profiling algorithm GRPGEWEX Radiation Panel GSMaPGlobal Satellite Mapping of Precipitation HOAPSHamburg Ocean Atmosphere Parameters and Fluxes from Satellite data set H-SAFHydrology Satellite Application Facility IPWGInternational Precipitation Working Group IFNetInternational Flood Network ISCCPInternational Satellite Cloud Climatology Project JMAJapan Meteorological Agency MSGMeteorological Satellite (METEOSAT) Second Generation MW/IRMicrowave-Calibrated Infrared precip product NASANational Aeronautics and Space Administration NCEPNational Centers for Environmental Prediction NEWSNASA Energy and Water Studies NRLNaval Research Laboratory 25 February 2010IGWCO Planning Meeting, New York City, USA 19

Acronyms PEHRPPProgram for the Evaluation of High Resolution Precipitation Products PERSIANNPrecipitation Estimation from Remote Sensing Information using Artificial Neural Network PMMPrecipitation Measurement Missions SERVIRSistema Regional de Visualización y Monitoreo SMAPSoil Moisture Active & Passive Satelite SMOSSoil Moisture and Ocean Salinity SRBSurface Radiation Budget SRFsurface TMPATRMM Multi-satellite Precipitation Analysis TOAtop of the atmosphere TOVSTelevision-Infrared Observation Satellite (TIROS) Operational Vertical Sounder TRMMTropical Rainfall Measuring Mission WECwater and energy cycle WGNEWorking Group on Numerical Experimentation XCALCross-Calibration working group 25 February 2010IGWCO Planning Meeting, New York City, USA 20