A apresentação está carregando. Por favor, espere

A apresentação está carregando. Por favor, espere

Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa 1749-077 Lisboa – Portugal Tel.: (351) 21 844 7000 Fax: (351)

Apresentações semelhantes


Apresentação em tema: "Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa 1749-077 Lisboa – Portugal Tel.: (351) 21 844 7000 Fax: (351)"— Transcrição da apresentação:

1 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Thermal Radiation Down-welling Long-wave Fluxes at the Surface Isabel F. Trigo

2 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: MSG-based Radiation Products Down-welling Long-wave Flux (DSLF) Definition Algorithm Basis The LSA SAF DSLF product from MSG Validation

3 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Adapted from K. Trenberth, J. Fasullo, and J. Kiehl. 30% 23% 90% 4% 47% Thermal RadiationSolar Radiation Radiation Budget Earth Surface Short-Wave Net Radiation Loss Gain Long-Wave Net Radiation Loss Gain ? ?

4 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Adapted from K. Trenberth, J. Fasullo, and J. Kiehl. 30% 23% 7% 23% Thermal RadiationSolar Radiation 90% 4% Radiation Budget Earth Surface Short-Wave Net Radiation Loss Gain Long-Wave Net Radiation Loss Gain X X

5 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Emitted by the atmosphere, Ra Emitted by the surface, Rsup Reflected by the surface, Rrefl Surface Down-welling Long-Wave Radiation Down-welling Long-wave Fluxes at the Surface Long-wave Radiation reaching the Surface: Essentially emitted by the lowest 100 m of the atmosphere It is controlled by concentration of abosrbing gases CO2, CH4, H2O,... presence of clouds, clouds phase temperature profile & temperature of cloud base....

6 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: F LW = Total irradiance at the surface within the [4 – 100 m] interval: Surface Down-welling Long-Wave Radiation Spectral irradiance emitted downwards by the atmosphere Wavelength ( m) Observed Downward Spectra Radiance – a clear sky day (adapated from Turner et al., 2004 in J. Atmos. Sci.

7 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: 7 Satellite observations provide information on variables that control Down-welling Longwave Fluxes at the surface: Clouds Temperature Profiles Humidity profiles Remote Sensing Surface Down-welling Long-Wave Radiation

8 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: F LW as estimated in the LSA SAF from MSG/SEVIRI Channel 1 VIS 0.6 m Channel 2 VIS0.8 Channel 3 NIR1.6 Channel 4 MIR3.9 Channel 5 WV6.2 Channel 6 WV7.3 Channel 7 IR8.7 Channel 8 IR/O Channel 9 TIR10.8 Channel 10 TIR12.0 Channel 11 IR/CO Channel 12HRV SEVIRI/MSG SEVIRI/MSG Data: Other Information: atmosphere screen temperature (ECMWF forecast) total column water vapour (ECMWF forecast) Cloud identification: channels 1-4, 7, 9 & 10 Down-welling Longwave Flux at the Surface (DSLF) Surface Down-welling Long-Wave Radiation

9 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Parameterization based on Stefan-Boltzman Law: Surface Down-welling Long-Wave Radiation F LW as estimated in the LSA SAF from MSG/SEVIRI T clear-sky, clear-sky T cloudy-sky, cloudy-sky Cloud cover fraction Down-welling Longwave Flux at the Surface (DSLF)

10 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Fractio n of Cloud Total column water vapour 2m air temperature 2m dew point depression Parameterization based on Stefan-Boltzman Law: Surface Down-welling Long-Wave Radiation F LW as estimated in the LSA SAF from MSG/SEVIRI Forecasts: (ECMWF) Down-welling Longwave Flux at the Surface (DSLF)

11 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Surface Down-welling Long-Wave Radiation 15 November UTC12 UTC Clouds signature?

12 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Surface Down-welling Long-Wave Radiation 15 November UTC12 UTC Clear Sky -Cloudy/Partially Cloudy -

13 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Surface Down-welling Long-Wave Radiation Generation Frequency - 30 min MSG projection & resolution Over land... Available since Europe – Feb 2005 Full disk – Jul 2005 Also distributed with quality flag (pixel by pixel basis) But... Algorithm changed in 2008!

14 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: Surface Down-welling Long-Wave Radiation Daily Accumulated Long-wave Flux MSG projection & resolution Over land... Available since Full disk 2010 Also distributed number of time-slots used for each (pixel) estimation.

15 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: DSLF - Validation Comparison with in situ measurements Comparison with other satellite products (CERES onboard Aqua and Terra) Location of Ground Observations

16 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: DSLF - Validation LSA SAF DSLF colocated in space and time with Ground Stations & CERES (http://aqua.nasa.gov/about/instrument_ceres.php) Northern Europe Stations clear sky cloudy Jan Apr 2007 CERESSEVIRI DSLF BiasRMSEBiasRMSE Clear Sky All Sky Problems: - Cloud identification at the edge of Meteosat disk - DSLF model for ice clouds - Temperature inversions

17 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: DSLF - Validation LSA SAF DSLF colocated in space and time with Ground Stations & CERES (http://aqua.nasa.gov/about/instrument_ceres.php) Central Europe Stations Jan Apr 2007 CERESSEVIRI DSLF BiasRMSEBiasRMSE Clear Sky All Sky Problems: - Temperature inversions

18 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: DSLF - Validation LSA SAF DSLF colocated in space and time with Ground Stations & CERES (http://aqua.nasa.gov/about/instrument_ceres.php) Semi-arid & Desert Stations Jan Apr 2007 CERESSEVIRI DSLF BiasRMSEBiasRMSE Clear Sky All Sky Problems: - Impact of high aerosol loads

19 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: DSLF Comparison with in situ data -10 Wm -2 < Bias < 10 Wm -2 Root Mean Square Differences (RMS) ranges from considerably (from ~15 to 25 Wm -2 ) LSA SAF estimates DSLF at the original satellite resolution (3 km at the sub-satellite point), every 30 –minutes, covering Meteosat disk Satellite data provide Cloud information

20 Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa Lisboa – Portugal Tel.: (351) Fax: (351) URL: DSLF Applications – Please see presentation in Session 8 DSLF As one of the components of the Surface Radiation Budget, DSLF applications include: Forcing of Land Surface (and Hydrology) models Model Assessment (surface and atmospherirc) Case Studies


Carregar ppt "Ministério da Educação e Ciência Instituto de Meteorologia, I. P. Rua C – Aeroporto de Lisboa 1749-077 Lisboa – Portugal Tel.: (351) 21 844 7000 Fax: (351)"

Apresentações semelhantes


Anúncios Google