toa radiative flux estimation from ceres angular ... · toa flux group activities sept 2002 – may...
TRANSCRIPT
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TOA Radiative Flux Estimation From CERES Angular Distribution Models
Norman G. LoebHampton University/NASA Langley Research Center
Hampton, VA
Contributors: K. Loukachine, S. Kato, N. M. Smith, Arvind Gambheer
May 6, 2003
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TOA Flux Group Activities
Sept 2002 – May 2003ADM Publications:i) ADM paper (Part I) describing CERES/TRMM SW, LW & WN
ADMs (J. Appl. Meteor., 42, 240-265, 2003).ii) Part II summarizing TRMM ADM validation results (accepted with
minor revisions).iii) Paper on use of neural networks for TOA flux estimation -
(Konstantin Loukachine; accepted with minor revisions).iv) Paper comparing theoretical and empirical retrievals of TOA
albedo from ice clouds using POLDER data (Wenbo Sun; in preparation).
May 2003 – Sept 2003Development and validation of Terra ADMs based on 2 years of CERES/Terra RAP measurements.
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Terra ADM DevelopmentTerra ADMs will be based on 2 years of CERES measurements.Increase angular resolution of ADMs (goal: 2° or 5°).Increase the number of scene types. Testing new 1°-resolution clear land+desert ADMs.New Snow and sea-ice ADMs.Use of “continuous” LW ADM scene types.Neural network scheme to improve TOA flux estimates for footprints with excessive “no retrievals”.Validation: Extend alongtrack instantaneous TOA flux consistency tests.
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Terra SW ADMs – Clear Ocean
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Terra SW ADMs – Clear ScenesClear Ocean: Similar approach as for CERES/TRMM but with 2° angular bin resolution. Wind speed dependent empirical ADMs + theoretical correction for aerosol optical depth variations.
* 6 bins of wind speed (0-12 m s-1 in steps of 2 m s-1)* 45 solar zenith angle bins (0-90 deg in steps of 2 deg) * 45 viewing zenith angle bins (0-90 deg in steps of 2 deg) * 90 relative azimuth angle bins (0-180 deg in steps of 2 deg)
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ImagerCERES
1°
1°
θ
(
Objective: Compare ADM-derived TOA fluxes over 1° regions from different viewing geometries. Are TOA fluxes consistent?
1° Regional Instantaneous TOA Flux Consistency Test
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Terra SW ADMs – Clouds Over Ocean
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Clouds over Ocean:“Continuous” ADMs using sigmoidal fit approach for 3 cloud phase categories:
i) Liquid Water (Phase < 1.01)ii) Mixed Phase (1.01 < Phase < 1.75)iii) Ice (Phase > 1.75)
Terra SW ADMs – Clouds Over Ocean
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Terra SW ADMs – Clear Land & Desert
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Terra LW ADMs – Clear Ocean, Land & Desert
See Manalo-Smith ADM WG Presentation
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Azimuthally-Dependent LW ADMs – Clear Land
See Arvind Gambheer ADM WG Presentation
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Terra LW ADMs – Clouds Over Ocean
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LW Radiance vs θ(f=1.0; 290°K < Ts < 295°K; 55°K < Ts-Tc < 60°K)
Viewing Zenith Angle (°)0 10 20 30 40 50 60 70 80 90
LW R
adia
nce
(W m
-2 s
r-1)
20
30
40
50
60
70
80
90
εc=0.1
εc=0.5
εc=1.0
F=250.7 W m-2
F=198.4 W m-2
F=158.8 W m-2
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Snow, Sea Ice & Fresh Snow
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Terra SW & LW ADMs – Snow, Sea-Ice
Cloud Fraction (6)Tsfc (6)Tsfc-Tcld (5)
Cloud Fraction (6)Ice Fraction (6)Ice (2), Cloud (2)
Sea IceSW (23)LW (132)
Cloud Fraction (6)Tsfc (6)Tsfc-Tcld (5)
Cloud Fraction (6)Snow Fraction (6)Snow (2), Cloud (2)
Fresh SnowSW(23)LW(132)
Cloud Fraction (6)Tsfc (6)Tsfc-Tcld (5)
Cloud Fraction (6)Cloud (2)
Permanent SnowSW (8)LW (132)
LongwaveShortwave
See Seiji Kato ADM WG Presentation
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Fresh Snow Permanent Snow Sea Ice
Anis
otro
pic
Fact
or
Viewing Zenith Angle (°)
φ=90 – 110 φ=70 - 90
φ=170 – 180 φ=0 - 10
Sample SW ADMs: θo=55° - 60°
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TOA Albedo Direct Integration Tests: Snow
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Use of Neural Network Scheme to Predict TOA Fluxes
See Konstantin Loukachine ADM WG Presentation
(FSSF – FADM)/FANN (%)
Num
ber o
f CER
ES F
OVs SW LW
- Determine TOA fluxes when imager information is unavailable or too many pixels have no cloud retrieval.
-Train neural network with TRMM ADMs to predict TOA fluxes usingonly CERES SW, LW & WN radiances and ECMWF parameters.
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Conclusions
- Early results from Terra ADMs look promising. Improvement over TRMM ADMs especially outside of Tropics.
- Final Terra ADMs expected to be completed in September, 2003.
- More work needed to evaluate quality of 1°-resolution SW clear land ADMs and fits for ocean LW ADMs.
- SW and LW ADMs yet to be developed for clouds over land and desert.