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Assessment of Global Precipitation Data for IPCC Arnold Gruber and Vincenzo Levizzani

Assessment of Global Precipitation Data for IPCC Arnold Gruber and Vincenzo Levizzani. GOAL: To provide an assessment of global precipitation data sets suitable for use by IPCC Assessment will include: Information on input data- satellite, in situ Uncertainties in rainfall estimates

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Assessment of Global Precipitation Data for IPCC Arnold Gruber and Vincenzo Levizzani

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  1. Assessment of Global Precipitation Data for IPCCArnold Gruber and Vincenzo Levizzani • GOAL: To provide an assessment of global precipitation data sets suitable for use by IPCC • Assessment will include: • Information on input data- satellite, in situ • Uncertainties in rainfall estimates • Techniques for merging various sources of data and uncertainty in final product • Information of spatial and temporal variability of precipitation including trends

  2. Workshop held 3-4 Aug 2004, 15 scientist attended • Assess the GPCP data set with supporting data as needed ( Monthly mean, 2,5 x 2.5, 1979-2003 ) • Supporting data: GPCP Pentad, CMAP, SSM/I, Gauges, TRMM… • Other data sets for assessment should be at least 10 years or longer and have been published. • Assessment should be based on published or soon to be published literature • Outline developed • 23 scientists have agreed to participate

  3. GPCP Assessment Draft Outline Executive Summary (Arnold Gruber,Vincenzo Levizzani,) • Introduction (motivation, brief history – A. Gruber and V. Levizzani) 2. Global Precipitation Data Sets 10-12 pp.(Chris Kidd and Kenji Nakamura) 2.1 Introduction (bare basics of how/why in situ and remote sensing estimates –) 1-2 pp. 2.2 GPCP Monthly mean 3-5 pp. 2.2.1 Input data and characteristics 2.2.1.1 Gauges 2.2.1.2 satellite estimates - SSM/I, GPI, OI, TOVS 2.2.2 Analysis procedures 2.2.3 Error characteristics 2.3 Other precipitation data sets (similar to 2.2, but compressed – ) 3-5 pp. 2.3.1 CMAP (Xie) 2.3.2 Satellite based estimates; microwave, infrared, combined , etc (compare/contrast various algorithms) 2.3.3 TRMM PR and TMI 2.3.4 Gauge (GPCC, GHCN-CAMS, CRU, … –) … 2.4 Chapter summary 1 page

  4. GPCP Assessment Outline, Cont’d 3. Spatial and Temporal Variability of Precipitation (comparison, validity – ) 20 pp.+fig’s (Chet Ropelewski and Phil Arkin) 3.1 Introduction 3.2 Mean distribution (single number, single map, zonal profile –) 3.3 Annual cycle (perhaps sub-monthly comes in here? – ) 3.4 Seasonal to inter-annual variations 3.5 Inter-decadal variations / trends 3.6 Summary 4. Future Directions (Emmanouil Anagnostou and Alberto Mugnai) 4.1 New-generation satellites, short-interval precipitation data sets, radar observing systems, … … • Conclusions and Recommendations ( A. Gruber, V. Levizzani) Appendix 1: Authors, Contributors, and Reviewers

  5. GPCP Assessment cont’d PROPOSED SCHEDULE: Invite participation 13 August 2004 Set participants 1 September 2004 Presentation at WGDMA/GRP meeting - 18 October 2004 IPWG presentation on participants and outline 25 October 2004 Draft documents ready for review (6 weeks before draft) - Late December 2004 First Draft - Late January 2005 Follow-up workshop - March/April 2005 Final Draft review -June 2005 Final Draft - August/September 2005

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