02.04.2004GIST 21 st, Boulder The Surface Radiation Budget within the Satellite Application Facility...

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

02.04.2004GIST 21 st, Boulder The Surface Radiation Budget within the Satellite Application Facility...

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