Jean-Louis Roujean CNRM / Météo-France

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Presentation transcript:

Jean-Louis Roujean CNRM / Météo-France SOLAR RADIATION VALIDATION

DSSF daily cycle

DSSF Validation Strategy Validation with in-situ data: Carpentras, Roissy Other ground stations: Data access to be coordinated with other SAFs Satellite product inter-comparison (SAFs,…) Comparison with model output (ECMWF)

Validation with in situ measurements

DAILY TIME SERIES EXAMPLES Clear Sky Clear Sky AOT 440nm X10-3 Cloudy Sky Cloudy Sky

Comparisons with in-situ measurements (period 2004-2006) Stat. 2004 à 2006 Clear sky : bias : 5 W/m2 stdev : 40 W/m2 Cloudy sky : Bias : 5 W/m2 stdev : 115 W/m2

VALIDATION TIME SERIES: ALL SITES 6 Stations in Europe (2004-2006) 4 Stations in Africa (2006) Overestimation of the radiation in clear sky situations (potentially due to aerosol effect) bias=5W/m2 stdev=40W/m2 bias=45W/m2 stdev=75W/m2 absolute absolute bias=5W/m2 stdev=115W/m2 bias=-2W/m2 stdev=125W/m2 absolute absolute

Validation of DSSF over France with RADOME network (8 km)

Yearly profile (2006) of DSSF for 2 contrasted sites Carpentras (Provence) & Roissy (Paris airport) ECMWF: -> under-estimate (clear) & over-estimate (cloudy)

DSSF Validation : NIAMEY (from RADAGAST project, ARM mobile station) March, 2 May, 12 July, 1

DSSF Validation : AGOUFOU (CESBIO data) January, 13 March, 2 May, 12

Comparison of DSSF SAF-LAND / ECMWF – August 2005 > Tracking of convective zones -> Less radiation

Daily DSSF (DIDSSF) Comparison between daily cumulative DSSF (DIDSSF) (left) and ECMWF forecast product (SSRD) over France at different dates during June 2009.

Comparison between daily cumulative DSSF (DIDSSF) (left) and ECMWF forecast product (SSRD) over France at different dates during June 2009.

COMPARISON WITH MODIS ALBEDO [0.4µm,0.7µm] 16-day average MSG Albedo – MODIS albedo projected on SEVIRI grid [0.7µm,4µm] over Europe (from 2005-06-01 to 2006-10-01) [0.3µm,4µm] 10-25 juin 2006

Comparison MSG with MODIS

MSG – MODIS : absolute difference MSG – MODIS : relative difference VISIBLE Broad-Band June 10, 2005 MSG – VIS-DH SAF Land – Quality Flag MSG – MODIS : absolute difference MSG – MODIS : relative difference

MSG – MODIS : absolute difference MSG – MODIS : relative difference NIR Broad-Band June 10, 2005 MSG – NIR-DH SAF Land – Quality Flag MSG – MODIS : absolute difference MSG – MODIS : relative difference

Statistical results (bias/stdev) between broadband albedos MSG et MODIS over Europe Bias is negligible except VIS = 0.015 (due to aerosols ?) Standard deviation : 0.015 for VIS 0.030 for NIR

Albedo Time Series: Evora 0.6µm 0.8µm 1.6µm [0.4µm,0.7µm] [0.3µm,4µm] [0.7µm,4µm]

Albedo Time Series: Barrax 0.6µm 0.8µm 1.6µm [0.4µm,0.7µm] [0.3µm,4µm] [0.7µm,4µm]

COMPARISON WITH MODIS ALBEDO 12-27 juillet 2006

MSG – MODIS : absolute difference MSG – MODIS : relative difference VISIBLE Broad-Band July 19, 2006 MSG – VIS-DH SAF Land – Quality Flag MSG – MODIS : absolute difference MSG – MODIS : relative difference Bias = 0,047 ; RMSE = 0,026

ALBEDO TIME SERIES (Agoufou; Mali) X10 for AOT Modis SW-DH albedo SAF-Land albedo Observed albedo Rainfall The temporal evolution of the albedo estimate is related to the evolution of surface properties (typically rainfall). The spurious fluctuations appear to be caused by aerosol effects.

ALBEDO TIME SERIES (Banizoumbou; Niger) The temporal evolution of the albedo estimate is related to the evolution of surface properties (typically rainfall). The spurious fluctuations appear to be caused by aerosol effects.

ALBEDO TIME SERIES (Niamey; Niger) The temporal evolution of the albedo estimate is related to the evolution of surface properties (typically rainfall). The spurious fluctuations appear to be caused by aerosol effects.