Comparison of SW flux profiles from CERES TRMM and …4/25/07 CERES STM 1 Comparison of SW flux...
Transcript of Comparison of SW flux profiles from CERES TRMM and …4/25/07 CERES STM 1 Comparison of SW flux...
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4/25/07 CERES STM 1
Comparison of SW flux profilesfrom CERES TRMM and Hadley GEM
Wenying SuScience Systems Applications Inc. Hampton VA
Alejandro BodasMet Office, Hadley Center for Climate Change, Exeter UK
Tom CharlockNASA Langley Research center, Hampton VA
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4/25/07 CERES STM 2
Data
• CERES TRMM FSW: monthly gridded radiative
fluxes and clouds;
• Hadley Center Global Environmental Model: AMIP
(Atmospheric Model Intercomparison Project) run;
• July 1998: clear and all sky.
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4/25/07 CERES STM 3
TRMM Diurnal Sampling Adjustment
• To adjust the TRMMdiurnal sampling issue,for each CSZA bin:
• Monthly mean flux:
!
"bin
=True_CSZA
bin
TRMM _CSZAbin
!
F =1
NFi
bin"bin
i=1
N
#
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4/25/07 CERES STM 4
TRMM Diurnal Sampling Adjustment(cont’d)
• The CSZA weighting is not perfect;
• The TOA SW downwelling flux for a given latitude
still fluctuates a few watts across the longitude;
• Introducing a factor to scale the TRMM FSW TOA
downwelling flux to be equal to that of Hadely
GEM.
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4/25/07 CERES STM 5
Validity of the Method
• The true monthly mean: run Fu-Liou model every 10minutes for a month for clear and cloudyconditions;
• The TRMM-style monthly mean: randomly pick afew samples every day from the Fu-Liou modelruns;– Sample number ranging from 60 to 300;
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4/25/07 CERES STM 6
Flux Difference Histogram
every bin is filled one bin is missing
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4/25/07 CERES STM 7
1. Northern Africa2. Red Sea3. Saudi and Oman4. Arabian Sea5. India6. Bay of Bengal7. Burma and Vietnam8. South China Sea and Pacific9. Mexico10. Gulf of Mexico and Cancun11. Caribbean Sea and Cuba12. Atlantic
1 2 3 4 5 6 7 8 91011 12 1
Surface albedo comparison
Hawaii
Hainan
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4/25/07 CERES STM 8
Clear Sky TOA Albedo comparison 1 2 3 4 5 6 7 8 91011 12 1
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4/25/07 CERES STM 9
Clear Sky Downward SW Flux
70 hPa 200 hPa
500 hPa Sfc
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4/25/07 CERES STM 10
MODIS Aerosol Optical Depth
Generated by Giovanni
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4/25/07 CERES STM 11
Aerosol forcing from SARB 1 2 3 4 5 6 7 8 91011 12 1
1. Northern Africa2. Red Sea3. Saudi and Oman4. Arabian Sea5. India6. Bay of Bengal7. Burma and Vietnam8. South China Sea and Pacific9. Mexico10. Gulf of Mexico and Cancun11. Caribbean Sea and Cuba12. Atlantic
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4/25/07 CERES STM 12
Clear Sky Heating Rate
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4/25/07 CERES STM 13
Clear Sky Heating Rate: Sfc to TOA
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4/25/07 CERES STM 14
All Sky TOA Albedo Comparison
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4/25/07 CERES STM 15
All Sky Downward SW Flux
70 hPa 200 hPa
500 hPa Sfc
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4/25/07 CERES STM 16
All Sky Heating Rate
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4/25/07 CERES STM 17
All Sky Heating Rate: Sfc toTOA
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4/25/07 CERES STM 18
Conclusions• The CSZA weighting method corrects the TRMM diurnal
cycle very well;• TRMM’s surface albedo is smaller than that of the model,
except over northern Africa;• For clear sky, TRMM flux is smaller than model flux at 70,
200, 500 hPa and surface. There is no longitudal variationfor 70 and 200 hPa, but for 500 hPa and surface, thedifference between TRMM and model is very large overnorthern Africa;
• For cloudy sky, TRMM and model flux agree well at 70 hPa.TRMM flux is smaller than model flux over the northernAfrica, the Arabian sea, and the Atlantic Ocean, and agreewell over the Pacific Ocean at 200, 500 hPa and surface.
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4/25/07 CERES STM 19
Backup Slides
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4/25/07 CERES STM 20
1. Northern Africa2. Rea Sea3. Saudi and Oman4. Arabian Sea5. India6. Bay of Bengal7. Burma and Vietnam8. South China Sea and Pacific9. Mexico10. Gulf of Mexico and Cancun11. Caribbean Sea and Cuba12. Atlantic
1 2 3 4 5 6 7 8 91011 12 1
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4/25/07 CERES STM 21
Green is coarse mode aerosol!
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4/25/07 CERES STM 22
Clear Sky Downward SW Flux Difference
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4/25/07 CERES STM 23
Clear Sky Transmittance: @200 hPa
1. Northern Africa2. Rea Sea3. Saudi and Oman4. Arabian Sea5. India6. Bay of Bengal7. Burma and Vietnam8. South China Sea and Pacific9. Mexico10. Gulf of Mexico and Cancun11. Caribbean Sea and Cuba12. Atlantic
1 2 3 4 5 6 7 8 91011 12 1
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4/25/07 CERES STM 24
Clear Sky Transmittance
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4/25/07 CERES STM 25
Clear Sky Heating Rate Difference
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4/25/07 CERES STM 26
All Sky Transmittance
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4/25/07 CERES STM 27
All Sky Downward SW Flux Difference
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4/25/07 CERES STM 28
All Sky Heating Rate Difference