Radiation Products Applications

1. Radiation Products Applications Isabel F. Trigo

2. Radiation Products • MSG-based Radiation Products • Albedo Variability • Signatures in LST fields • LST & Vegetation • LST as a model diagnostic tool • Surface Radiation Budget • Long-wave • Short-wave

3. Radiation Products The LSA SAF generates, archives and distributes • Albedo - AL • Land Surface Temperature (and emissivity) – LST ( & EM) • Down-welling Short-wave Fluxes at the Surface - DSSF • Down-welling Long-wave Fluxes at the Surface - DSLF

4. Radiation Products • 4 production areas for MSG - Europe - Northern Africa - Southern Africa • Southern America • Geostationary Projection • 3 km at sub-satellite point 1701 cols x 651 lines 2211 cols x 1151 lines 701 cols x 1511 lines 1211 cols x 1191 lines

5. Radiation Products 1550 Merging MSG areas Geostationary Projection 3 km at sub-satellite point 50 1240 700 40 1460 Form 1 matrix for the whole disk [3712 x 3712] taking into account that for LSA SAF areas top line in the disk is and left column is 1850 XX XX 2140 3712 columns x 3712 lines

6. Radiation Products • See Product User Manuals • And also • Algorithm Theoretical Basis Document • Validation Report • Product Output Format Peer Reviewed Publications

7. Snow Radiation Products - Albedo Albedo Seasonal Cycle: Snow Primarily driven by Vegetation & Snow High Albedo Values over Deserts LowAlbedo Values Vegetated Areas

8. Radiation Products - Albedo Spot the Differences! Use July 2007 December 2007

9. Tanganica Lake Kariba Malawi Cabora Bassa Dam Okavango Delta ALBEDO

10. Radiation Products - Albedo 01 May 2011 Anomaly

11. Radiation Products - Albedo 01 May 2011 Anomaly • Signatures of • Drought ? • Higher than usual Precipitation? • Snow anomaly?

12. Radiation Products - Albedo 01 May 2011 Anomaly • Signatures of • Drought ? • Higher than usual Precipitation? • Snow Anomaly? Precipitation: % of Normal for April 2011 (source: GPCC)      

13. Radiation Products - Albedo 01 May 2011 Anomaly Namibia Heavy Rainfall in May 2011 Source: http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=50573

14. 15 August 2009 00UTC Montains Radiation Products - LST Features in LST maps ... Night-time!!

15. Radiation Products - LST Features in LST maps ... Night-time!! • Major cities – Urban Heat Island • Inland Water Bodies • ? 15 August 2009 00UTC

16. Radiation Products - LST Features in LST maps ... Night-time!! Lakes 15 August 2009 00UTC Paris Rome

17. Radiation Products - LST Heat Waves Mapping the Heat-Wave in Europe JUL 2007 LST Composite 19-23 July 2007 12 UTC Eastern and South-Eastern Europe

18. Radiation Products - LST X 2009 X 2010 X 2011 • Daily Amplitudes of LST are generally anti-correlated with Fraction of Vegetation • Vegetation controls temperature via Evapotranspiration

19. Radiation Products – LST & Land Sfc Models Boussetta et al., 2011 Constant LAI LAI MODIS climate January July

20. Bias of control Exp: Model Skin Temp – LSA SAF LST Tsk_CTL – LST 12 UTC 00 UTC • Good agreement of night-time temperatures; • Underestimation of daily amplitudes, particularly in semi-arid and/or sparsely vegetated regions.

21. Impact on model skin Temperature Impact on variable X: │X_CTL – X_obs│- │X_MOD – X_obs│ Mean absolute Error of Control Experiment - MeanError of Modified model Impact > 0  Error Reduction

22. Changing LAI: Impact on skin Temperature 0 UTC 12 UTC • There is a positive impact of the MODIS LAI in MAM (and JJA – not shown) in daytime temperatures. • The impact is higher in regions where vegetation presents large annual cycles. • The impact is small for night-time cases (when model biases are smaller).

23. Radiation Products • Down-welling Short- and Long-wave Fluxes are strongly influenced by clouds; at seasonal scale, they will have the signature of • ITCZ and monsoon (tropics) • dominant storm-tracks (mid-latitudes) Also ... Short-Wave←TOA Incoming solar Radiation Long-wave←low-level temperature

24. Radiation Products Surface Radiation Budget FLW FSW↑ FSW DSSF FLW↑ ALBEDODSSF DSLF DSLF

25. Radiation Products Surface Radiation Budget FSW FLW + - ALBEDODSSF DSLF - DSLF (1-ε)-LST4 DSSF + Short-wave Radiation budget at the surface Long-wave Radiation budget at the surface LSA-SAF – CLEAR SKY only!!

26. Radiation Products Downward Short-Wave Surface Radiation 2 maps of average daily DSSF (accumulated field / 24 x 3600) 15 Jan 2011 ? 15 Jul 2011 ?

27. Radiation Products Downward Short-Wave Surface Radiation 15 Jan 2011 15 Apr 2011 15 Jul 2011 15 Oct 2011

28. Radiation Products Downward Long-Wave Surface Radiation 2 maps of average daily DSLF (accumulated field / 24 x 3600) 15 Jan 2011 ? 15 Jul 2011 ?

29. Radiation Products Downward Long-Wave Surface Radiation 15 Jan 2011 15 Apr 2011 15 Jul 2011 15 Oct 2011

30. Radiation Products Short-Wave Surface Radiation Budget FSW -ALBEDODSSF =DSSF Short-wave Radiation budget at the surface 15 Jul 2011 15 Jan 2011

31. DSLF – Downward Long-wave Radiation Radiation Reflected by the Surface Radiation Emitted by the Surface - - Balanço < 0, i.e., sfc generally looses Long-wave Radiation = Radiation Products 1 PIXEL (Evora; Southern Portugal) Surface Radiation Budget Long-wave Radiation DSLF (1-) DSLF   LST4 25 Apr 2006 25 Apr 2006 25 Apr 2006 25 Apr 2006

32. Radiation Products Surface Radiation Budget 1 PIXEL (Evora; Southern Portugal) SW (1-AL) DSSF TOTAL Radiation Budget 25 Apr 2006  = LW 25 Apr 2006 25 Apr 2006

33. http://landsaf.meteo.pt Publications Download Data Documentation (User Manuals, Validation Reports) Helpdesk isabel.trigo@meteo.pt