Norman G. LoebNASA LaRCHampton, VA

Contributors: B.A. Wielicki, D.R. Doelling

Oct 26th, 2006, CERES STM (Exeter, UK)

CERES TOA and Surface RadiativeFlux Error Analysis

ARM/BSRN/CMDL/SurfradSurface Radiation Sites

Comparisons with ERBE-Like

Aug 2002 Clear-sky AlbedoERBE-like mean ERBE-like – SRBAVG_nonGEO

• The CERES ADMs and scene identification is an improvement over ERBE-like- most notable in clear-sky identification

• This will effect cloud forcing fluxes

TOA SW Cloud Forcing, Jan 2002

• SWCF = SWclear-sky - SWall-sky Blue is cooling, Red iswarming

ERBE-like − SRBAVG_GEOSRBAVG_GEO

TOA LW Cloud Forcing, Jan 2002SRBAVG-GEO ERBE-like − SRBAVG_GEO

TOA NET Cloud Forcing, Jan 2002SRBAVG_GEO ERBE-like − SRBAVG_GEO

Global TOA flux derived from SRBAVG_nongeo and ES4 productsall-sky SW

clear-sky SW

all-sky LW

clear-sky LW

(a)

-15 -10 -5 0 5 10 15

La

titud

e (°)

-90

-60

-30

0

30

60

90

SW

LW

(b)

-15 -10 -5 0 5 10 15

-90

-60

-30

0

30

60

90

(c)

ES-4 minus SRBAVG TOA Flux Difference (W m-2

)

-15 -10 -5 0 5 10 15

-90

-60

-30

0

30

60

90

(d)

-15 -10 -5 0 5 10 15

-90

-60

-30

0

30

60

90

SW & LW TOA Flux Difference (ES4 – SRBAVG_nongeo)

April 02 July 02

October 02 January 03

26.323.825.4Net (clr-sky)264.0266.3266.7LW (clr-sky)51.151.249.4SW (clr-sky)

6.46.93.8Net (all-sky)237.1237.7239.0LW (all-sky)97.896.798.5SW (all-sky)

CERESSRBAVG

(GEO)

CERESSRBAVG

(non-GEO)

CERESERBE-Like

Wm-2

CERES Global TOA Fluxes (3-year mean)