CAMS McClear service

Last update: March 2017

    Presentation Credits - Automatic access - Further questions? - Release notes

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PRESENTATION

This service provides time series of Global, Direct, and Diffuse Irradiations on horizontal surface, and Direct Irradiation on normal plane (DNI) for the actual weather conditions as well as for clear-sky conditions.

  • Geographical coverage : field-of-view of the Meteosat satellite, roughly speaking Europe, Africa, Atlantic Ocean, Middle East (-66° to 66° in both latitudes and longitudes)
  • Temporal coverage of data is from 2004-02-01 up to 2 days ago (NEW)
  • Time step: from 1 min to 1 month.
  • Maximum number of requests per day and per registered user: 15. This limit may evolve.

Main publication

The main publication about CAMS McClear is: Lefèvre M., A. Oumbe, P. Blanc, B. Espinar, B. Gschwind, Z. Qu, L. Wald, M. Schroedter-Homscheidt, C. Hoyer-Klick, A. Arola, A. Benedetti, J. W. Kaiser, and J.-J.  Morcrette, "McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions", Atmos. Meas. Tech., 6, 2403-2418, 2013, doi:10.5194/amt-6-2403-2013.
More publications on CAMS radiation service on this page (keyword: "McClear").

         The CAMS Radiation Service in a nutshell - Version 6 (December 2016)
     
  User's Guide to the CAMS Radiation Service - December 2016

Outputs

  1. Observation period (ISO 8601)
  2. TOA. Irradiation on horizontal plane at the top of atmosphere (Wh/m2)
  3. Clear sky GHI. Clear sky global irradiation on horizontal plane at ground level (Wh/m2)
  4. Clear sky BHI. Clear sky beam irradiation on horizontal plane at ground level (Wh/m2)
  5. Clear sky DHI. Clear sky diffuse irradiation on horizontal plane at ground level (Wh/m2)
  6. Clear sky BNI. Clear sky beam irradiation on mobile plane following the sun at normal incidence (Wh/m2)

In verbose mode (1 minute summarization only), additional columns are:

  1. sza. Solar zenith angle for the middle of the summarization (deg)
  2. atm. Atmospheric profile code: afglus=U.S. standard afglt=tropical afglms=midlatitude summer afglmw=midlatitude winter afglss=subarctic summer afglsw=subarctic winter
  3. tco3. Total column content of ozone (Dobson unit)
  4. tcwv. Total column content of water vapour (kg/m2)
  5. AOD BC. Partial aerosol optical depth at 550 nm for black carbon
  6. AOD DU. Partial aerosol optical depth at 550 nm for dust
  7. AOD SS. Partial aerosol optical depth at 550 nm for sea salt
  8. AOD OR. Partial aerosol optical depth at 550 nm for organic matter
  9. AOD SU. Partial aerosol optical depth at 550 nm for sulphate
  10. AOD 550. Aerosol optical depth at 550 nm
  11. AOD 1240. Aerosol optical depth at 1240 nm
  12. alpha. Angstroem coefficient for aerosol
  13. Aerosol type. Type of aerosol: -1=no value 5=urban 7=continental clean 8=continental polluted 9=continental average 10=maritime clean 11= maritime polluted 12=maritime tropical 13=antarctic 14=desert
  14. fiso. MODIS-like BRDF parameter fiso
  15. fvol. MODIS-like BRDF parameter fvol
  16. fgeo. MODIS-like BRDF parameter
  17. albedo. Ground albedo

CREDITS

The research leading to these results has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 218793 (MACC project, 2009-2011), no. 283576 (MACC-II project, 2011-2014) and from the European Union's H2020 Programme (FP7/2007-2013) under grant agreement no. 633080 (MACC-III project, 2014-2015). The service is part of the Copernicus Atmosphere Monitoring Service (CAMS).    

 

AUTOMATIC ACCESS

WPS, in brief

The WPS (Web Processing Service) is a means to invoke CAMS McClear by a computer, without human-machine interface. This is the means that has been selected to fulfill the request for automated access. This way of doing is a standard in Earth observation and digital geography and offers many other advantages than a graphical user interface. In particular, anyone can create a portal invoking CAMS McClear by calling the WPS that we are offering. It greatly helps the dissemination.

These services are described in the catalog
www.soda-is.com/service/wps?SERVICE=WPS&request=GetCapabilities
that reveals the get_mcclear operations.

If you are using an appropriate library, it is fairly easy to develop the application.
Otherwise, you may try to find one. There are plenty, for example google "library execute wps ogc".

The call to DescribeProcess provides a description of the inputs and outputs of each service (that you discover in the result of the call to GetCapabilities):
www.soda-is.com/service/wps?SERVICE=WPS&Request=DescribeProcess&Identifier=get_mcclear&version=1.0.0

Access with WGET

NB: CAMS McClear can be accessed using a WPS or by WGET. For more details, please refer. For more details, please refer to the corresponding SoDa page.
 

FURTHER QUESTIONS

Contact CAMS User Support
 

RELEASE NOTES

Date Version Details
2012 v1 Prototype
2013 v2.0 Final version for the SoDa service
2013-09 v2.0 Bug fixed in Solar Geometry 2 library
Edition format file version 1
2014-03 v2.1 Earlier Solar Geometry 1 library not sustained further, replaced with Solar Geometry 2
2014-07 v2.2 Climatic zones (AFGL) maps modification in equatorial zone (Mozambique): dithering the edge between 2 zones
2014-08 v2.3 Climatic zones (AFGL) modification in equatorial zone (Mozambique): gradation of value between 2 zones
2014-08 v2.3 Bug fixed in the calculation of MODIS albedo
2014-10 v2.4 Bug fixed in the conversion of UT into TST
2015-01 v2.6 Edition format file version 2
2015-10 v2.7 Bug fixed for Short term vs long term mismatch. A difference has been noticed between the long term values (2004 Feb to 2015 June)  and the short term values  (2015 May to 2015 August) for the global irradiation received by an inclined surface estimated by HC3v5. For the two months overlapping: May and June 2015, these values differ from one request to August) for the global irradiation received by an inclined surface estimated by HC3v5. For the two months overlapping: May and June 2015, these values differ from one request to the other by a very small amount while they should not. Causes are in the procedure for optimization processing speed.

 

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