sinergee update richard allan, tony slingo

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