Navigation and service

Highlights Archiv

New Climate Data Record available: 32-years of top of atmosphere radiation parameters from Meteosat MVIRI and SEVIRI

It is our pleasure to announce the release of a new CM SAF data record of Top of Atmosphere (TOA) radiation based on the
METEOSAT MVIRI and SEVIRI instruments. The data record is available free of charge via the Web User Interface and is
provided in a user friendly NetCDF data format.
The MVIRI/SEVIRI data record provides a homogeneous satellite-based climatology of the TOA Reflected Solar (TRS) and
Emitted Thermal (TET) radiation. The record extends from February 1983 to April 2015. The TOA radiation products are
provided as daily means, monthly means and monthly averages of the hourly integrated values (diurnal cycle). The data record is
of particular interest to study the climate variability in the METEOSAT field of view. The excellent temporal resolution (30 minutes
/15 minutes) is a step forward to increase the knowledge of the diurnal cycle.
Combining the MVIRI and SEVIRI instruments on board the METEOSAT first and second generations of satellites allows
covering a large period of time with an unprecedented spatial and temporal resolution. Long-term data records are an essential
prerequisite for climate monitoring. The MVIRI/SEVIRI data record of TOA radiation covers a time period longer than 30 years,
complementing the data provided by the GERB and CERES missions.
The data record is also featured by an excellent spatial sampling with data provided on a regular grid at a spatial resolution of
0.05°x0.05° (i.e. about (5.5x5.5) km²) and covering the region between ± 70° longitude and ± 70° latitude. Such a fine resolution
is particularly useful for analysing the small-scale spatial variations of radiation. The chosen resolution also ensures a strong
synergy with the CM SAF SARAH, CLAAS-2 and upcoming MVIRI/SEVIRI based climate data record releases
(CM SAF SARAH-2, CFC and LST data).

Figure 1 and Figure 2, respectively, show the longterm average (1983-2015) of the ToA Reflected Solar (TRS) and Emitted
Thermal (TET) radiation from the MVIRI/SEVIRI data record.

TRS ToA Reflected Solar (TRS)Figure 1: Long-term average (1983-2015) of TRS Source: CM SAF

TET ToA Emitted Thermal (TET) RadiationFigure 2: Long-term average (1983-2015) of TET Source: CM SAF

More information on the data record is available from the
DOI page

For more information please contact our User Help Desk.

Product User Manual (PUM)
Validation Report (VAL)
Algorithm Theoretical Basis Document (ATBD)

MU / Jan2017

EUMETSAT Council approves next five year phase of the CM SAF

“At the end of the 86th EUMETSAT Council session early
December 2016, the EUMETSAT Director-General signed
the CM SAF cooperation agreement with the President of
the Deutscher Wetterdienst as leading entity of the SAF on
Climate Monitoring for the Third Continuous Development
and Operations Phase (CDOP-3). The CDOP-3 covers
the period 2017-2022 and will further extend the CM SAFs
portfolio of operational products and develop new products.

New Partner of the CM SAF for CDOP-3 is France
(CNRS/LEGOS) who will lead the activities to derive global
precipitation climatological data records.”

MW / Dec2016

CDOP3_SignatureSource: Eumetsat

New Climate Data Record available: SEVIRI cloud properties CLAAS-2 data record

CLAAS-2 Source: DWD

The CLAAS-2 record provides cloud properties derived from the SEVIRI sensor onboard METEOSAT second generation (MSG)
satellites. This second edition is the improved and extended follow-up of the first version of the record (Stengel et al., 2014). In
order to ensure a homogeneous data basis, the solar SEVIRI channels of MSG-1, MSG-2 and MSG-3 were intercalibrated
(Meirink et al, 2013) with MODIS Aqua before applying the cloud retrievals. CLAAS-2 features 12 years (2004-2015) of cloud
mask/type, cloud top temperature/pressure/height, cloud phase as well as cloud microphysical properties such as optical
thickness, effective droplet radius and cloud water path. The data are available on native SEVIRI resolution, i.e. 15 minutes
repeat cycle and 3km (nadir) to 11km (edge of the field of view) spatial resolution. In addition, spatio-temporal averages of the
above mentioned cloud properties are included: Daily and monthly averages and monthly histograms on a 0.05°x 0.05° grid as
well as monthly mean diurnal cycles on a 0.25°x 0.25° grid. The advancements compared to CLAAS-1 can be summarized

  1. extended MSG measurement record used with better calibration,
  2. improvements made on retrieval algorithm leading to products with higher quality and
  3. increased temporal resolution (15 Minutes).

In contrast to ed. 1, CLAAS-2 does not contain radiation products anymore. Along with the data, a comprehensive
documentation including user guide, algorithm descriptions, reprocessing layout and extensive validation studies, is provided.
With CLAAS-2, regional and large scale cloud processes at temporal scales of minutes to years can be studied.


CLAAS-2 TabSource: DWD


EUMETSAT Council approves next five year phase of the CM SAF


At its 85th meeting the EUMETSAT Council approved the 3rd Continuous Development and
Operations Phase (CDOP-3) of the SAF on Climate Monitoring.

In the years 2017 to 2022 CM SAF will continue to develop and deliver improved Climate
Data Records (CDR) of Essential Climate Variables (ECV) related to the energy and
water cycle.

Furthermore, CM SAF will continue to provide an exhaustive user service: Summary
overview of CM SAF major products and services in CDOP-3:

Products and Services

For some of the Thematic Climate Data Records (TCDR) CM SAF will also provide regular updates every 5 days

(Interim Climate Data Records). Among the above listed products, the following products are new in CDOP-3:

  • Global precipitation over land and ocean (SSM/I, SSMIS, MWS, MWI);
  • Regional land fluxes (latent and sensible heat flux, land surface temperature from Meteosat MVIRI/SEVIRI);
  • Photosynthetically Active Radiation (PAR) and sunshine duration

    (defined as the time in a given period (month) for which the direct solar irradiance exceeds 120 W/m²); and

  • Global high clouds (high cirrus cloud amount and improved estimates for cloud top levels from HIRS IR from NOAA and

    Metop satellites).

    CNRS/LEGOS from France will lead the activity to develop and provide a global precipitation product as new CM SAF

    Consortium Member.

MW June 2016

Availability of new SARAH-E data set, covering the Indian Ocean and surroundings

We are happy to announce the availability of a new data set called 'SARAH-E' (Surface Solar Radiation Data Set – Heliosat,
East), which has been generated in close cooperation between the CM SAF and the European Commission’s Joint Research
Center in Ispra, Italy.

SARAH-E is based on the METEOSAT Indian Ocean Data Coverage Imagery data and is available from 1999 to 2015,
excluding 2006. The quality of the SARAH-E climate data record is comparable to the quality of the SARAH data record;
identical satellite retrieval algorithms have been applied for the generation of those data records. SARAH-E provides the
global (SIS), the direct (SID), and the normalized direct (DNI) surface solar radiation with a spatial resolution of
0.05° x 0.05° longitude/latitude and temporal resolutions ranging from monthly to daily and hourly, and covers the
region 8°W to 128°E, 6S°S to 65°N. SARAH-E is suitable for the analysis of climate variability of surface solar radiation
on various scales.


SIS, CM SAF, SARAH-E, 1999-2014SIS, CM SAF, SARAH-E, 1999-2014 Source: DWD

UP / June2016

Global Climatology of Sunny Days based on SARAH and CLARA

The CM SAF extended its climatology of sunny days to the global scale. Basis are the CM SAF datasets SARAH and CLARA,
which offer more than three decades of homogeneous, high resolved surface radiation data with high accuracy. SARAH stands
for Surface Solar Radiation Data Set – Heliosat and is basing on data of the geostationary satellite Meteosat. CLARA stands for
CM SAF cLouds, Albedo and Radiation dataset from AVHRR and provides global information based on data from polar
orbiting satellites Both datasets are well suited for climatological analyses and are provided by the CM SAF free of charge

The analysis of the so-called “sunny days” was started in cooperation with the Goethe University Frankfurt. A “sunny day” is
defined by the fact that the mean daily global radiation corresponds to at least 80 % of the maximum possible solar
insolation. A “sunny period” is characterized by five consecutive “sunny days”. Basing on SARAH and CLARA solar radiation
data the possibility of each day of a year for being a “sunny day” or belonging to a “sunny period” was determined.

The results of this analysis are display via an interactive map on the CM SAF webpage
( Here the “sunny days” probability of global
capitals and additional selected cities can be easily derived (see example in Fig. 1). Please let get in touch with us if you would
like to receive this information for other places: Email-Adresse

Sunny Days KigaliFig. 1 The possibility of sunny days for Kigali, Rwanda Source: DWD

SK / June2016

Dissemination of two CM SAF products via EUMETCast started on 21 April


Thursday, 21 April 2016

The following CM SAF products are disseminated via EUMETCast:

Monthly means of Fractional Cloud Cover
Example filename:

Monthly means of Surface Incoming Shortwave Radiation
Example filename:

The product format is netCDF.

More information on the products can be found on Operational Products section of the CM SAF website.

The products are distributed on EUMETCast Europe and EUMETCast Africa:

Channel: SAF-Africa
PID: 301
Multicast Address:

Users wishing to access these products via their EUMETCast station should register through the
Earth Observation Portal (EOP).

For more information, contact the EUMETSAT User Service Helpdesk.

PF / April2016

The CM SAF Fundamental Climate Data Record (FCDR) of SSMI / SSMIS Brightness Temperatures

SSMI / SSMIS Brightness Temperatures Source: CM SAF

Availability of new CM SAF
The CM SAF Fundamental
Climate Data Record (FCDR)
of SSM/I and SSMIS brightness
temperatures covers the time
period from July 1987 to
December 2013 including all
available data from the six SSM/I
radiometers aboard F08, F10,
F11, F13, F14, and F15 and
from the three SSMIS
radiometers aboard F16, F17,
and F18.

The SSM/I part remains unchanged compared to the existing CM SAF SSM/I FCDR.

The new FCDR provides homogenised and inter-calibrated brightness temperatures in a user friendly data format. The
improved homogenization and inter-calibration procedure ensures the long term stability of the FCDR for climate related
applications. All available raw data records have been reprocessed to a common standard, starting with the calibration
of the raw Earth counts, to ensure a completely homogenized data record. The data processing accounts for several
known issues with the SSM/I and SSMIS instruments and corrects calibration anomalies due to along-scan
inhomogeneity, moonlight intrusions, sunlight intrusions, and emissive reflector. Furthermore, the inter-calibration
model incorporates a scene dependent inter satellite bias correction and a non-linearity correction to the instrument
calibration. The data files contain all available original sensor data and metadata to provide a completely traceable
climate data record. Inter-calibration and Earth incidence angle normalization offsets are available as additional layers
within the data files in order to keep this information transparent to the users. The data record is complemented with
radiometer sensitivities, quality flags, surface types, and Earth incidence angles.
The data records can be ordered via the Web User Interface. More information on the dataset is available from the
DOI page

KF / June2015

Climatology of Sunny Days in Europe based on SARAH

The new CM SAF SARAH data set provides climate-quality data of the surface solar radiation from 1983 to 2013, i.e.,
for more than 30 years. This long term data record allows for climatological analyses of the surface solar radiation.

In cooperation with the University of Frankfurt, Institute for Atmospheric and Environmental Sciences, the
CM SAF has derived the climatological annual cycle of sunny days in Europe. For each day of the year the probability
for a sunny day was calculated and is made available for selected European cities

For each city, this analysis indicates certain
periods during the year with a higher or
lower likelihood of being sunny than other
periods. While on the shorter-term
weather forecasts provide reliable
information, this analysis provides
information on the climatological

You can access the interactive map of
European cities by clicking on the time
series for Berlin (left figure) or via the
following link: > Map sunny days

JT / Apr2015

Release of the new Surface Solar Radiation Data Set - Heliosat (SARAH)
The CM SAF Project Team is happy to announce the release of the new SARAH (Surface Solar Radiation Data Set –
Heliosat) climate data record of surface solar radiation.
SARAH is based on the observations of the MVIRI and SEVIRI instruments onboard the geostationary Meteosat satellites and provides climatological data of the surface irradiance (SIS), the surface direct normalized irradiance (DNI) and the
effective cloud albedo (CAL). The data are available from 1983 to 2013 as monthly, daily, and hourly averages and cover
the region ±65° longitude and ±65° latitude (see figures) on a 0.05° x 0.05° regular longitude/latitude grid. The accuracy
of the data has been determined against surface reference measurements; for the monthly averages the accuracy is
5.5 W/m2 (SIS) and 17.5 W/m2 (DNI). The temporal stability has been substantially improved compared to the previous
CM SAF surface radiation data set (Posselt et al., 2012). Further information can be found in the documentation of


Figure: (left) Multi-year average and (right) linear decadal trend of the surface solar radiation (SIS) from SARAH.

All products are now available for ordering via CM SAF’s web user interface. For more information contact our
User Help Desk.

Product User Manual (PUM)
Validation Report (VAL)
Algorithm Theoretical Basis Document (ATBD)

Related Publications
Posselt, R., R. W. Müller, R. Stöckli, and J. Trentmann, 2012: Remote sensing of solar surface radiation for climate
monitoring — the CM-SAF retrieval in international comparison. Remote Sensing of Environment, 118, 186-198.
Müller, R., T. Behrendt, A. Hammer, and A. Kemper, 2012: A New Algorithm for the Satellite-Based Retrieval of Solar
Surface Irradiance in Spectral Bands. Remote Sensing, 4, 622-647.
Müller, R., U. Pfeifroth, C Träger-Chatterjee, J. Trentmann, R. Cremer: Digging the METEOSAT treasure - 3 decades
of solar surface radiation and effective cloud albedo. manuscript submitted for publication in Remote Sensing, 2015
JT / Feb2015

Release of the SEVIRI 15min cloud mask dataset
The CM SAF Project Team presents the CM SAF SEVIRI cloud mask dataset – 15 minutes resolution, edition 1 based
on 9 years of SEVIRI measurements (2004 to 2012).

CMa_MSGSource: DWD

Figure 1. Cloud mask values for 15th of June 2010 at 11:45 UTC for the entire SEVIRI disk (Figure is taken from Stengel
et al. (2014)). Right panel: Overview of SEVIRI measurements record at CM SAF used as basis for this dataset.
Short- term data gaps are shown enlarged.

Dataset description
The SEVIRI cloud mask dataset has recently been generated and released by the EUMETSAT Satellite Application
Facility on Climate Monitoring (CM SAF) to enhance the cloud property dataset CLAAS (Stengel et al. 2014). The SEVIRI
cloud mask dataset contains the cloud mask in 15 minutes temporal resolution. The dataset is pixel based, where a
SEVIRI pixel is about 4x4 km² in size, depending on location in SEVIRI's field of view. The data are provided with
regional coverage from +- 60° N/S and +- 60° E/W. Inter-calibrated effective radiances of Meteosat-8 and 9 form the
basis of the cloud mask dataset which spans 9 years from 2004 to 2012. The dataset is complemented with a
comprehensive documentation of the algorithms used and the generation of the dataset. Validation studies and user
guidance are available as well. With this dataset, small, regional and large scale cloud processes at temporal scales
of hours to years can be studied. In addition, the dataset is suited for all applications in which a conservative cloud
mask is essential (e.g. land surface, aerosol or trace gas retrievals). See Table 1 for technical specifications of the


All products are now available for ordering via CM SAF’s web user interface. For more information
contact our User Help Desk. The dataset flyer can be downloaded here.

- Product User Manual (PUM) SEVIRI cloud mask dataset
- Validation Report (VAL) SEVIRI cloud mask dataset
- Algorithm Theoretical Basis Document (ATBD), from NWC SAF, also valid for CMA SEVIRI

For the precursor dataset (including all cloud properties) see:
Stengel, M., Kniffka, A., Meirink, J. F., Lockhoff, M., Tan, J., and Hollmann, R.: CLAAS: the CM SAF cloud property
data set using SEVIRI, Atmos. Chem. Phys., 14, 4297-4311, doi:10.5194/acp-14-4297-2014, 2014.

Table 1. Technical specifications of the dataset.
Time period:
2004 – 2012
Temporal resolution:15 minutes (pixel-based products)
Spatial coverage:Meteosat disk
Spatial resolution:approx. 4km, native SEVIRI resolution
Data Format:HDF5

MSt / Jan2015

2015 CM SAF Training Workshop

Training SelectionSource: DWD

The CM SAF invites applications for the 2015 EUMETSAT /
CM SAF Training Workshop on “The Use of gridded
Satellite Data for Climate Services in Africa”, which will take
place from 8 to 12 June 2015 at the WMO/CGMS Virtual
Laboratory Centre of Excellence for Training and Education
of the South African Weather Service, Pretoria, South
The key objective of the 2015 CM SAF Training Workshop
is to instruct active and potential users of gridded satellite
data in the use of CM SAF products for climate monitoring
and climate research focusing on applications in Africa. More
information on the workshop can be found on the
online application form. The deadline for application is
Friday, 30 January 2015.
Climate Atlas based on CM SAF data sets

Climate AtlasSource: Eumetsat

A new Climate Atlas based on CM SAF data sets is
available at the EUMETSAT Website
This atlas, developed by Zanita Avotniece (Latvian
Environment, Geology and Meteorology Centre),
provides satellite-based climate information on a
variety of parameters for Europe and Lativa. It is
also a guide for working with satellite data in
climatology and provides detailed instructions to
enable users to create their own atlas.
WMO Regional Climate Centre for Europe and Middle East uses CM SAF data on a routine basis

Regional Climate Centres (RCC) are Centres of Excellence that assist WMO
Members in a given region to deliver climate services and products.
Products from CM SAF are used by RCC to generate maps and statistical
information on

Surface AlbedoWater Vapour
4th CM SAF User Workshop 10 – 12 March 2014, Grainau, Germany


In March 2014 about 100 experts from Europe, Africa
and Overseas met in Grainau to discuss the product
and service portfolio of the Satellite Application
Facility on Climate Monitoring (CM SAF).

The presented talks are available now (klick hee)


This Page

© DWD - 2014