the surface radiation budget within the satellite application facility on climate monitoring

02.04.2004 GIST 21st, Boulder

The Surface Radiation Budget within theSatellite Application Facility on Climate Monitoring

(CM-SAF)

02.04.2004

Rainer Hollmann2

withAnnegret Gratzki2

Richard Müller2, Carlos Geijo-Guerrero3, Alex Kryvobok4

2Deutscher Wetterdienst,3INM, Madrid, Spain

4UMHI, Kiev


The Surface Radiation Budget within the CM-SAF

• Satellite Application Facility on Climate Monitoring

• Surface Shortwave Radiation• general approach • initial validation results• first pre-operational images

• Surface Longwave Radiation• general approach• initial validation results • first pre-operational images

• Conclusions

Overview of Talk


SAF - Structure and Hosts

United Kingdom - UKMO -Numerical Weather

Prediction

Denmark - DMI -GRAS

Portugal - IM -Land Surface

Analysis

Finland - FMI -Ozone

Monitoring

Spain - INM -Support to Now-casting and Very

Short Range Forecasting

France - MF -Ocean and Sea

Ice

Germany - DWD -Climate Monitoring

E U M E T S A T


CM-SAF: The Partners


• support climate monitoring at regional scale

• provide climate data sets

• provide validation data

CM-SAF: objectives and characteristics

• Operational environment

• Long term with reprocessing capability

• Quality Assurance + Control

• provision of validated

• homogeneous and

• consistent data sets


GMT May 4 14:49:21 2001 OMC - kk+w 0 10002000

km

Inner Arctic Circle

MSG Area

Initial Baseline Area

CM-SAF: The Area under investigation…

> 2007

> 2004

> 2007

• BL-Area: Europe and part of North Atlantic Ocean (60° W – 60° E, 30° N – 80° N)

> 20??


CM-SAF: The Schedule

2000 20101 2 3 4 5 6 7 8 9

DEVELOPMENT PHASE

B r i d g i n g P h a s e

ENVISAGED

incl. R&D

O p e r a t i o n s

MSG_1(27.08.2002)

METOP_1

IOP incl. R&D

AVHRR+MSG / BL

AVHRR BL

AVHRR+MSG / FD






• Conclusions


Surface Radiation Budget:Schematic overview of processing

MSG(SEVIRIGERB)

NOAA-AVHRR/EPS

CloudproductsPer pixel

Surface Radiation BudgetPer pixel

Background

LUT

NWP-model data

Gridding

merging

AlbedoPer pixel


Cloud top height March 2004

• Full area has been split up into ~ 30 tiles for cloud processing• 1 x 1 km² spatial resolution• instantaneous data of an overpass 06.03.2004 02:48


Monthly mean cloud cover Feb. 2004

• Full area, 15 km x 15 km spatial resolution


Solar Surface Radiation:General approach/Layout prototype

Satellite Data

int.water vapoursfcto

a

Surface Obs.

e.g. spec. albedo maps,surface type

GME analyses Background data & maps

Validation

Model runs of SHDOMfor N atmosph. conditions

Lookuptable forSIS = f (sza, _sfc_toa,T)

Inst. SIS monthly means,Daily means,mean diurnal cycle

User

Improvement


Surface Shortwave Radiation (SIS):Validation

Two initial validation exercises:

• Take GERB-like METEOSAT-7 fluxes as input + ECMWF model water vapour

=> case study for Cabauw 21-23.09.2001

• Take ISCCP-DX data (cloud data + Lvis) + NTB + ECMWF water vapour

5 months for validation with surface meas. Comparison with GEWEX-SRB for August 1995


Zeit in Stunden nach 22.09.01 0:00 UTC

Surface shortwave radiation for 22. - 24. September 2001

*: METEOSAT derived fluxes

:Measurements in Cabauw (NL)

: Cloudcoverin % (given bysatellite)

Time in hours after 22. September 0:00 UTC

Sho

rtw

ave

surf

ace

flux

in W

/m²

Surface Shortwave Radiation: Validation (I)

100 %

0 %


SIS in situ - SIS sat Payerne Version 8x

0

100

200

300

400

500

600

700

800

900

1000

0 100 200 300 400 500 600 700 800 900 1000

SIS in situ (W/m²)

SIS

sat

(W

/m²)

Payern, Switzerland

Statistics [W/m2] [W/m2] [W/m2] [W/m2] [W/m2] [%] [W/m2]YEAR MONTH NVAL MA_ME SI_ME MA_CA SI_CA CORR RMS RMS BIAS

1995 8 117 424.2 271.4 365.5 194.9 0.85 159 37.5 -58.7

Surface Shortwave Radiation:Validation (II)

Sat

ellit

e /

W/m

²

In-situ / W/m²


SIS in situ - SIS sat Arkona Version 8x

0

100

200

300

400

500

600

700

800

900

1000

0 100 200 300 400 500 600 700 800 900 1000

SIS in situ (W/m²)

SIS

sa

t (W

/m²)

Arkona, Germany

Arkona [W/m2] [W/m2] [W/m2] [W/m2] [W/m2] [%] [W/m2]YEAR MONTH NVAL MA_ME SI_ME MA_CA SI_CA CORR RMS RMS BIAS

1995 8 120 431.5 206.4 454.6 204.3 0.96 65.6 15.2 23

Sat

ellit

e /

W/m

²

In-situ / W/m²



YEAR MONTH NSTAT MA_ME[W/m2]

SI_ME[W/m2]

MA_CA[W/m2]

SI_CA[W/m2]

BIAS[W/m2]

BIAS[%]

1994 3 50 214.5 148.0 228.6 136.2 14.1 7.61994 5 50 369.2 237.3 392.1 213.8 22.8 6.51995 8 46 398.0 234.9 399.8 213.1 1.7 0.61993 10 47 179.2 130.4 202.9 116.5 23.7 13.81997 12 38 93.6 67.5 86.5 56.7 -7.2 -6.4

NSTAT: Number of available validation stations, MA_ME: Measured monthly average, SI_ME: standard deviation of measured data, MA_CA.: Calculated monthly average, SI_CA: standard deviation of calculated data, BIAS calculated - measured in W/m²and % of measured average.

Validation results of monthly means SIS, Based on ISCCP-DX/ECMWF input data



Comparison of SIS monthly mean with SRB-GEWEX (Aug. 1995)

CM-SAFSIS in W/m²

SRB-GEWEXSIS in W/m²(SW)

Surface Shortwave Radiation


Comparison of SIS monthly mean with SRB-GEWEX (Aug. 1995)

Monthly mean, regional comparison1° x 1° lat-lon

SIS (CM-SAF) in W/m²

SIS

(GE

WE

X)

in W

/m²

Y = 0.8799120291 * X + 16.22678981Mean bias: 13 W/m²R-squared = 0.82

Surface Shortwave Radiation


First results from February 2004: downwelling Shortwave

Daily mean if 3 daylight overpasses

Monthly mean if 20 daily means are present


First results from February 2004: Surface albedo monthly mean






• Conclusions


The Gupta ParameterisationCACCSDL 21

7.333

22101 )( eTVAVAVAAC

hPahPaSe TTTT 740925 05.035.06.0

)( 33

2210

4

2CCC

cb

WBWBWBB

TC

Cloud-parameterisation

Clear sky parameterisation

The surface Radiation Budget within the CM-SAF: Longwave Radiation


Surface Longwave Radiation (SDL):Validation

Two initial validation exercises:

• Take radiosoundings for different BSRN stations, run Gupta with that and compare against surface measurements & RTM caculations (Fu-Liou)

case study for Lindenberg August 1995

• Take ISCCP-DX cloud data + ECMWF profiles of water vapour and temperature

5 months for validation with surface meas. Comparison with GEWEX-SRB for August 1995


Investigations of SDL-BiasesWhat is the effect of the improvements?

1995

1997


Monthly meanof downwelling longwave radiation for August 1995 in W/m²

Surface Longwave Radiation:Validation (II)


Y=0.9659531439 * X + 6.998371831mean CM-SAF DLF: 343.78 W/m²mean SRB GEWEX DLF: 339.07 W/m ²R=0.94

Surface Longwave Radiation:Validation (II)

1° x 1° lat – lon boxes


First results from February 2004: downwelling Longwave

Monthly average






• Conclusions



• Satellite Application Facility on Climate Monitoring has started the pre-operational processing of NOAA-AVHRR overpasses

• Surface Radiation Processing• improve aerosol information • monitoring of pre-operational products• test runs for GERB/SEVIRI (April 04)• test runs with CERES input (~summer 04)

• Ongoing validation • target months Oct. 2002, June 2003, Feb. 2004• building a matchup-database for validation

Conclusion, future plans and activities

the surface radiation budget within the satellite application facility on climate monitoring

Documents

validation data

rdthe surface radiation

wmsurface shortwave

utc shortwave surface

validation i100

climate data sets

consistent data setscmsaf

climate monitoringe