POLDER, CERES, GERB flux comparisons and information on AMMA and MeghaTropiques Michel Viollier
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2004/11/10 GIST 22, Brussels , LMD, M. Viollier 1
POLDER, CERES, GERB flux comparisons
and information on AMMA and MeghaTropiques
Michel ViollierLaboratoire de Météorologie Dynamique,
IPSL/CNRS, Ecole PolytechniquePalaiseau, France
with technical support by Sylvain Lassaut
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Outline Information: AMMA, Megha-
Tropiques CERES, POLDER nadir comparison CERES, GERB flux comparison
(January to March 2004) Monthly diurnal cycles from GERB
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AMMA (1/3)
African Monsoon Multidisciplinary Analyses(http://medias.obs-mip.fr/amma/index.en.html)
multidisciplinary project on the West African Monsoon and its impacts
Atmospheric Dynamics, Continental Water Cycle, Atmospheric Chemistry, Oceanic and Continental Surface Conditions.
Participation: France, Germany, UK, USA, Africa, …French Agencies: CNES, CNRS/INSU, IRD, and Meteo-France
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AMMA (2/3)
Long Term Observation Period : … 2009
Special Observing Period (SOP): various key stages of the rainy season during three periods in 2006: (i) monsoon onset, (ii) peak monsoon and (iii) late monsoon
AMMA-SAT : the satellite data component of AMMA
http://ammasat.lmd.polytechnique.fr/WelcomeE.html
In this project : we promote CERES and GERB data and plan to incorporate their main parameters in the AMMA-SAT database
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AMMA-SAT (3/3)
- data-set with multiple satellite products and data
- netcdf format with standard grid, organization and documentation (tools: ferret, live access server)GERB data in AMMA-SAT:- link to GERB archive system?- mirroring the GERB site?- hdf to netcdf transformation (of main parameters)?
Amma-sat regions (globe for coarse grid)
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ScaRaB-3 on - Tropiques (Megha-Tropiques)
Joint project between France and India
Stopped last year (CNES budget cuts) New green signal on 2004 End of B phase: 2004 Start of C phase: 2005 Planned to be launched on 2009
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Basic Megha-Tropiques Instruments
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Megha-Tropiques Orbits
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June 2003 – Reflectance vza<20°POLDER minus CERESgrid box method (0.5°)
(Reflectances multiplied by 100) Narrow-to-Broadband ConversionValidation with CERES.
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POLDER-CERES along trackand nearest ‘pixel’ method
Collocated POLDER triplets and CERES data (T < 5 mn D <2km) for June 2003 (1, 4, 5, 8, 11, 14, 17, 20, 24, 27, and 30 )
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Comparisons between POLDER and CERES radiances Figure 10b radiance over ocean Figure 10c radiance over continent
Comparisons between POLDER and CERES albedoes Figure 11d albedo over ocean Figure 11 albedo over continent
POLDER CERES :radianceand fluxcomparison at nadir
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GERB/CERES flux comparisons
- GERB data: ex. G2_SEV1_L20S_20031223_130000_V002.hdf
- CERES : ES8
- 3 periods: Jan 1-5, Feb 15-19, Mar 21-25 2004
- average data over 2.5 x 2.5° regions (and also 1° x 1°)
- keep regions with more than 80 (CERES) and 20 (GERB) observations for 2.5 x 2.5° regions
- compare GERB and CERES flux regional means, coincident ± 2 minutes (however, in the present version, we approximate UTC to the half quarter, i.e. 00:07:30, 00:22:30,.. )
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March 2004, 21 - flux
CERES
2.5° grid filled with GERB data
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GERB-CERES co-registration
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Jan. 2004, 1 to 5 – CERES/Terra GERB
SW LW day LW night
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stat2.5 (1.0) degree grid
GERB-Terra %mean difference
GERB-Aqua %mean difference
SW LWday
LWnight
SW LWday
LWnight
Dec23
1.4 -0.57 -1.5
Jan1-5
-3.2-3.1
-2.4-2.4
-2.1-2.4
1.20.2
-2.3-2.6
-2.1-2.2
Feb15-20
-1.8-2.6
-2.2-2.3
-2.5-3.2
-2.07-2.60
-1.9-2.3
-2.2-2.4
Mar21-25
-2.6-3.6
-1.9-2.0
-2.5-2.6
-3.4-3.2
-1.5-1.9
-2.2-2.5
Difference
in sampling ?
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CERES/GERB flux intercomparison
LW day LW night SWmean difference < ~2%, (preliminary result for 2003 Dec 23,approximate GERB observation time= 00:07:30, 00:22:30,.. )
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Jan. 2004, 1 to 5 – CERES/Aqua GERB
SW LW day LW night
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Feb. 2004, 15 to 20 – CERES/Terra GERB
SW LW day LW night
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Feb. 2004, 15 to 20 – CERES/Aqua GERB
SW LW day LW night
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March 2004, 21 to 25 – CERES/Terra GERB
SW LW day LW night
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March 2004, 21 to 25 – CERES/Aqua GERB
SW LW day LW night
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Same (March, Aqua) but 1° grid
SW LW day LW night
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Diurnal variations using GERB (preliminary) – 2004, January
Ocean, clear and partly cloudy
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Diurnal variations using GERB (preliminary) – 2004, January
Land (S. Africa), clear and partly cloudy
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Diurnal variations using GERB (preliminary) – 2004, January
Convective Clouds Area
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Diurnal variations using GERB (preliminary) – 2004, January
Land (East Africa), clear and partly cloudyCheck our localtime and SZA computation
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Diurnal variations using GERB (preliminary) – 2004, January
Valencia, 2.5° area
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Conclusion• In a first glance :
• Mean GERB SW and LW fluxes ~ 1 to 3 % low / ES8 CERES (Terra and Aqua)
• No noticeable gap or anomaly in the diurnal cycles
• Future works:
• Compare with SSF fluxes • Evaluation of the POLDER nb-bb conversion with GERB SW
radiances (availability of 2003 data ?, April to October)• Study the n2b conversion of HRI*SEVERI/GERB and the impact of
GEO combination on the CERES Terra monthly means computations • AMMA, A-train, ScaRaB/Megha-Tropiques, EarthCARE