October 2015 1

Martin Werscheck, Rainer Hollmann,

Jörg Trentmann, Frank Kaspar

Climate Data Records of ECVs from the CM SAF

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Current Status and application examples

October 2015

Overview:

• Short introduction to CMSAF products

• Using CMSAF products to evaluate quality

of ground based radiation measurements

• Analysing requirements of in-situ networks

for Germany (surface radiation, sunshine

duration).

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October 2015 3

CM SAF

• Data freely available in netcdf-format

• User-friendly data access via the Web

User Interface: www.cmsaf.eu/wui

• Toolkit (example data + software):

www.cmsaf.eu/tools

• CM SAF Community Site available via

EUMETSAT: training.eumetsat.int

Clouds Radiation Water Vapor

• EUMETSAT Satellite Application

Facility on Climate Monitoring

www.cmsaf.eu

• Provides satellite-derived climate

data of geophysical variables

• Regional, up to global coverage

• Currently, data available from Jan

1982 to October 2015

• Spatial resolution: 0.03° to 1°

October 2015 4

CM SAF data

Satellites used to generate CM SAF

data sets and operational products:

Meteosat (SARAH / CLAAS)

AVHRR (CLARA)

ATOVS / SSMI (HOAPS, FCDRs

(=radiances))

Cloud Information

Surface and ToA Radiation

Surface Albedo

Water Vapour

Precipitation, wind, surface

fluxes (ocean only)

Free Tropospheric Humidity

In the ‘pipeline’ (2016)

Land Surface Temperature

In the ‘pipeline’ (2020ff)

Precipitation (land)

Evapotranspiration

October 2015 5

Data Access

www.cmsaf.eu

www.cmsaf.eu/wui

Web User Interface

• Registration required

• Data will be delievered in 1 hr to 1 day to

an ftp server in hdf / netcdf format

CM SAF data is freely available without restrictions!

October 2015 6

CM SAF Workshops

CM SAF conducts annual

workshops / online events to

support the use of CM SAF data

Upcoming Event:

Applications of satellite-based data sets from the CM SAF

in numerical modeling, 14 to 17 November 2016, ECMWF,

Reading, UK

October 2015

Surface Solar Radiation Dataset – Heliosat (SARAH)

• Variables – Global irradiance (SIS) – Direct normalized irradiance (DNI) – Effective cloud albedo (CAL)

• Resolution – Spatial: 0.05° × 0.05° – Temporal: hourly, daily, monthly

means

• Coverage – Spatial: Meteosat disk – Temporal: 1983 to 2013

• Satellites – Meteosat 2 to 10 (MVIRI/SEVIRI)

• Freely available at www.cmsaf.eu

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October 2015 8

Application: Daily Variability

Validation of SARAH daily mean irradiance with DWD network

BSRN: Bias: 1.1 W/m2 MAB: 12.1 W/m2

October 2015 9

Comparison Chemnitz

Obvioues jumps in 1989 and 1997 / 98 …. Inhomogenities in station data?

Time series of differences between SARAH SIS and station measurement

October 2015 10

Climatology: Schleswig

Multi-year daily averages

• Very high correlation

October 2015 11

Correlation: dm- anomaly

CM SAF

• CM SAF data provide

good representation of

the spatial structure of

daily variability

• Correlation decreases

with distance of

stations.

October 2015 12

New DWD observation network

• The suggested new

DWD observation

network for surface

radiation covers

almoste completely

Germany with a

correlation of >0.9

(based on SARAH)

October 2015 13

Radiation Trends in D

• Positive trend in radiation

throughout D

• CM SAF underestimates trends by

about 1 W/m2/dec

October 2015

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Trend assessment, evaluation with GEBA

GEBA data provided by Arturo Sanchez-Lorenzo, IPE-CSIC, Zaragoza

Consistent linear trend;

underestimated by about 1.5 W/m2/dec

October 2015

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Spatial Trends • Mainly positive trends

• Substantial spatial variability

October 2015 16

Application: WMO RCC, KU23

WMO RA VI Regional Climate

Centre on Climate Monitoring

(http://www.dwd.de/rcc-cm)

Climatology

October 2015 17

Sunny days in Europe

www.cmsaf.eu

21.10.2014

28.10.2014

October 2015 18

Application: Solarenergy (KU1 HA)

DWD Solar Radiation Product for Germany: www.dwd.de/solarenergie • Combined product using the CM

SAF SIS operational product and surface measurements

• Generated on a monthly basis

October 2015 19

Application: Sunshine Duration

Sunshine Duration from DNI (SDU if DNI > 120 W/m2)

July May

October 2015

Sunshine duration:

in-situ vs. satellite

Which product provides best representation of the real conditions?

In-situ Sat

October 2015

in-situ vs. satellite

In situ only sat + 40 sat + 90

October 2015

Error in sunshine duration vs. number of stations used for merging

October 2015

Summary:

• CMSAF provides satellite-based datasets of

several parameters

• These datasets can be used to evaluate quality

and homogenity of in-situ observations

• DWD has analysed requirements for the in-situ

network based on CMSAF radiation data.

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