CAMS McClear service
|Last update: Oct. 2017|
This service provides time series of Global, Direct, and Diffuse Irradiations on horizontal surface, and Direct Irradiation on normal plane (DNI) in clear-sky conditions. The model has been upgraded to CAMS McClear version 3 during Oct. 2017 release.
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.
The CAMS Radiation Service in a nutshell - Version 6 (December 2016)
User's Guide to the CAMS Radiation Service - December 2016
- Observation period: beginning/end of the time period with the format "yyyy-mm-ddTHH:MM:SS.S/yyyy-mm-ddTHH:MM:SS.S" (ISO 8601)
- TOA: Irradiation on horizontal plane at the top of atmosphere (Wh/m2)
- Clear sky GHI: Clear sky global irradiation on horizontal plane at ground level (Wh/m2)
- Clear sky BHI: Clear sky beam irradiation on horizontal plane at ground level (Wh/m2)
- Clear sky DHI: Clear sky diffuse irradiation on horizontal plane at ground level (Wh/m2)
- 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:
- sza. Solar zenith angle for the middle of the summarization (deg)
- atm. Atmospheric profile code: afglus=U.S. standard afglt=tropical afglms=midlatitude summer afglmw=midlatitude winter afglss=subarctic summer afglsw=subarctic winter
- tco3. Total column content of ozone (Dobson unit)
- tcwv. Total column content of water vapour (kg/m2)
- AOD BC. Partial aerosol optical depth at 550 nm for black carbon
- AOD DU. Partial aerosol optical depth at 550 nm for dust
- AOD SS. Partial aerosol optical depth at 550 nm for sea salt
- AOD OR. Partial aerosol optical depth at 550 nm for organic matter
- AOD SU. Partial aerosol optical depth at 550 nm for sulphate
- AOD 550. Aerosol optical depth at 550 nm
- AOD 1240. Aerosol optical depth at 1240 nm
- alpha. Angstroem coefficient for aerosol
- 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
- fiso. MODIS-like BRDF parameter fiso
- fvol. MODIS-like BRDF parameter fvol
- fgeo. MODIS-like BRDF parameter
- albedo. Ground albedo
- Cloud optical depth (value of the nearest acquisition time of the pixel)
- Cloud coverage of the pixel (percentage from 0 to 100, value of the nearest acquisition time of the pixel)
- Cloud type (value of the nearest acquisition time of the pixel) -1=no value 0=no clouds 5=low-level cloud 6=medium-level cloud 7=high-level cloud 8=thin cloud
|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).|
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
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):
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.
|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.|
|2017-10||v3||Calls new McClear version 3 that fixes discontinuities in space and time (during day as well as seasons), uses less memory and reduces (a little) the error when compared to ground measurements.|