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