Erwin Wolters1 Bart van den Hurk1,2 Rob Roebeling1

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Presentation transcript:

Evaluation and application of SEVIRI rainfall retrievals over West Africa Erwin Wolters1 Bart van den Hurk1,2 Rob Roebeling1 1: Royal Netherlands Meteorological Institute (KNMI), de Bilt, Netherlands 2: Institute for Marine and Atmospheric Research Utrecht (IMAU), Utrecht, Netherlands

Motivation Precipitation of great importance to hydrological cycle Precipitation observations sparse over West Africa SEVIRI precipitation algorithm: daytime only Multispectral Based on retrieved cloud physical properties high spatial/temporal resolution EGU General Assembly, 6 April 2011

CPP Precipitation Properties algorithm SEVIRI R0.6, R1.6 =f(R0.6 μm) ΔH=f(CTT) re=f(R1.6 μm) CWP=f(,re) PRP=f(CWP,ΔH) EGU General Assembly, 6 April 2011

Evaluation: comparison with CMORPH Seasonal evolution (2005) over West Africa Diurnal cycle during daytime (7:30 – 16:30 UTC) EGU General Assembly, 6 April 2011

Seasonal cycle 2005 Rain rate CPP-PP CMORPH coastline EGU General Assembly, 6 April 2011

Latitudinal cross section May Jul Sep 2005 2006 EGU General Assembly, 6 April 2011

Daytime cycle June Semi-arid savannah Rain forest EGU General Assembly, 6 April 2011

Soil moisture-precipitation interaction Is rain occurrence and intensity different over wet and dry soils? -Focus on May (pre-monsoon) and Sep (post-monsoon) -No rain at 7:30 UTC to avoid nighttime MCS remnants -Anomalies of previous-day AMSR-E soil moisture, 0.25° × 0.25° EGU General Assembly, 6 April 2011

Methodology SEVIRI precipitation class “dry” class “wet” Soil moisture AMSR-E Soil moisture anomalies EGU General Assembly, 6 April 2011

Results May and Sep 2005 Rain occurrence Rain rate % mm h-1 mm h-1 % EGU General Assembly, 6 April 2011

Conclusions/outlook CPP in good agreement with CMORPH (and TRMM-PR) Applicable at various time scales (seasonal, daytime cycle) Unprecedented temporal resolution SEVIRI of added value To be extended with nighttime scheme using WV and IR channels EGU General Assembly, 6 April 2011

Thank you! EGU General Assembly, 6 April 2011