SINERGEE update

Richard Allan, Tony Slingo Environmental Systems Science Centre, University of Reading

Sean Milton, Malcolm Brooks, Jim Haywood Met Office

Met Office, April 22nd 2005

Recent ARG Comparison:

25th April 1200 UTC

March 1 2005 comparison

ARG: 238th row

ARG: 245th row

Model GERB(ARG)

OLR

RSW

Time-seriesGlobal and regional clear-sky time-series

using collocated data

Global Time Series: 2003-2005

18 Jan Model change20 Dec: SW mod

29 Sep,11Oct modNov, Dec, Jan 20, 22 Apr: improved geolocation

MS7 processing

9 Mar cloud mask

Global Time Series: differences Model minus GERB

May 2003 to February 2005

18 Jan Model change20 Dec: SW mod

29 Sep,11Oct modNov, Dec, Jan 20, 22 Apr: improved geolocation

MS7 processing

9 Mar cloud mask

Clear-sky Time-series: Mediterranean

OLR

Albedo

dOLR

GERB -Model

dAlbedo

Clear-sky Time-series: S. Atlantic

OLR

Albedo

dOLR

GERB -Model

dAlbedo

Model changes 18th January

Sahara: surface albedo change

GERB (ARG) MODEL 1200UT

17th

& 18th Jan

0.5

0.4

0.3

0.2

0.1

0.0

MODIS 16-day surface albedo product

GERB

Model (or difference)

Left: before

Right: after

Monthly mean comparisons

July 2004 Means

OLR

Albedo

GERB CERES

July 2004

Means:

GERB and

CERES (AQUA-FM4-

Ed2)

GERB minus CERES

Model and GERB means: June-July 2004

Model and GERB means: Jan-Feb 2005

Desert Dust: update- V3 TOMS data- July 2004 comparisons- Case Study?

July 2004: Model minus GERB/ARCH OLR diff:

1200 UT

Model-GERB OLR Model-GERB(ARCH) OLR

TOMS AOD_0.55 Model-GERB(ARCH) OLRc

July 2004: Clear-sky

OLR

Clear-sky OLR

difference

Model (Type I) GERB (ARCH)

Model (Type I) minus GERB (ARCH)

Possible Case Studies

• July 2004 experiment

• Desert Dust (e.g. 21 July 2004)

• Cirrus Outflow (e.g. 1 July 2003)

• Convection over land

• Stratocumulus

• Sahara albedo: further modifications?

21 July 2004 BT diff.

Using LUTs

Cirrus Outflow: OLR and vertical velocity, 1 July 2003

MODEL GERBMODIS cirrus

Namibian Stratocumulus region31st March 2004

Copnclusions

• GERB-model comparisons continue• Model changes reduce differences

– Sahara Albedo– Ocean clouds

• Another big desert dust signal (July 2004)• Future plans

– Experiments and case studies using Met Office NWP model