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Erwin Wolters1 Bart van den Hurk1,2 Rob Roebeling1

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Presentation on theme: "Erwin Wolters1 Bart van den Hurk1,2 Rob Roebeling1"— Presentation transcript:

1 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

2 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

3 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

4 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

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

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

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

8 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

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

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

11 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

12 Thank you! EGU General Assembly, 6 April 2011

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