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CM SAF

The Satellite Application Facility on Climate Monitoring (CM SAF)

The Satellite Application Facility on Climate Monitoring generates, archives and distributes widely recognised high-quality satellite-derived products and services for climate monitoring in operational mode. More : The Satellite Application Facility on Climate Monitoring (CM SAF)

Highlights


Highlights Archiv

We are pleased to announce the release of the CM SAF Land Surface Temperature Data Record SUMET:
DOI: 10.5676/EUM_SAF_CM/LST_METEOSAT/V001
SUMET provides satellite-based information of the temperatures of the top
millimeter (or “skin”) of the land surface under clear sky conditions. SUMET
is the first satellite-based LST climate data record which resolves the full
diurnal LST cycle. It covers Africa and parts of Europe and South America
back to 1991.
Based on inter-calibrated thermal radiances from Meteosat First and Second
Generation satellites, the data record has an excellent decadal stability. It is
therefore of particular interest to study climate variability of LST.
Complementary to near surface air temperatures, it can also be used to
augment station data in regions with a low station density.
The data record includes two different LST products: the Statistical Land
Surface Temperature product is characterized by the highest possible
consistency with the operational LST data from the Land Surface Analysis
Satellite Applications Facility (LSA SAF), while the Physical LST product
ensures the highest possible precision through the implicit use of radiative
transfer models.
SUMET land surface temperatures are presented as hourly data and as
monthly averaged diurnal cycle composites on a 0.05° x 0.05° latitude
and longitude grid. The data record is available free of charge via the
CM SAF Web User Interface and is provided in a user friendly NetCDF
data format.

LST LSTSource: CM SAF

This figure shows the long-term
average (1991- 2015) of the Meteosat
SUMET clear sky land surface temperature.
Along with the data, a comprehensive documentation including user guide, algorithm descriptions and extensive validation
studies, is given.
We are pleased to announce the release of the new CM SAF cloud fraction climate data record COMET:
DOI: 10.5676/EUM_SAF_CM/CFC_METEOSAT/V001
COMET is a homogeneous satellite-based cloud fraction climate data record
covering Europe, Africa, parts of South America as well as the surrounding
ocean areas back to 1991.
Based on inter-calibrated radiances from Meteosat First and Second
Generation satellites, the data record has an excellent decadal stability of
less than 1%. It is therefore of particular interest to study climate variability
of cloud cover. COMET is a characterized by comparability to SYNOP-based
long-term cloud fraction observations carried out at WMO ground stations
and can be used to supplement ground-based cloud fraction estimates in
areas with low station density or high spatio-temporal cloud variability.
COMET cloud fractions are provided as hourly, daily and monthly
composites with a 0.05° to 0.05° spatial resolution from 1991 to 2015. The
data record is available free of charge via the
CM SAF Web User Interface and is provided in a user friendly NetCDF
data format.

Along with the data, a comprehensive documentation including user guide,
algorithm descriptions and extensive validation studies, is given.

CFC CFCSource: CM SAF

This figure shows the long-term
average (1991-2015) of the Meteosat
COMET cloud fraction climate
data record.
NS / Sept2017


Updated CM SAF Surface Solar Radiation Climate Data Record available

The CM SAF is happy to announce the release of the second edition of the
Surface Radiation Data Set - Heliosat (SARAH-2):
http://doi.org/10.5676/EUM_SAF_CM/SARAH/V002

SARAH-2 provides high-quality satellite-based information on surface solar
radiation parameters from 1983 to 2015 covering Europe, Africa, parts of
South America as well as the surrounding ocean areas. The spatial
resolution of 0.05° x 0.05° almost matches the spatial resolution of the
MVIRI and SEVIRI sensors onboard the Meteosat satellites, which have
been used to generate the SARAH-2 data records.

Six surface solar radiation parameters are provided as part of SARAH-2:
the global radiation (SIS, also known as the surface irradiance), the direct
radiation (SID), the direct normalized radiation (DNI, i.e., the radiation
through a horizontal plate perpendicular to the sun), the sunshine
duration (SDU), the spectrally-resolved surface irradiance (SRI), and the
effective cloud albedo (CAL). The sunshine duration and the spectrally-
resolved surface irradiance are newly provided parameters as part of the
second edition of SARAH.

SARAH-2_SIS_mean_Global SARAH-2_SIS_mean_GlobalSurface Solar Radiation, SARAH-2 1983-2015 Source: CM SAF

All data records are available as monthly mean products (monthly sum in the case of SDU) and all except the SRI data record
are also available as daily mean products (daily sum in the case of SDU). For the SIS, SID, DNI, and CAL data records also
instantaneous information is provided every 30 min. These highly temporal resolved data replace the hourly mean data
provided in the first edition of the SARAH data record; this instantaneous information allows a better referencing of the data
to the corresponding solar geometry, which is required for the calculation of the solar radiation on tilted surfaces, e.g., solar
panels.

So far, more than 60 peer-reviewed journal articles document the CM SAF Surface Solar Radiation Climate Data Records and
their various fields of applications. These areas of application include (among others) climate monitoring and the assessment
of trends and variability, the validation of climate models, the quality control of surface measurements, the estimation of the
photovoltaic energy potential and its temporal variability and trend, and the use as input parameters for agro- and
hydrometeorological models. Some of these applications can be found in the Outreach-Section of the CM SAF Webpage.
The release of the second edition of the SARAH data record will further enhance the application of the CM SAF surface solar
radiation data records.

JT / June2017

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