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CALIPSO, CloudSat, CERES,and MODIS Merged Data
ProductSeiji Kato1, Sunny Sun-Mack2,
Walter F. Miller2, Fred G. Rose2,and
Victor E. Sothcott2
1NASA Langley Research Center2Science and Systems and Applications, Inc.
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CALIPSO-CloudSat-CERES-MODIS MergedProduct
• Funded by the NASA Energy Water Cycle Study(NEWS) project.
Expected contribution of the product To provide a global data set along the lidar/radar ground track with
the most accurate and comprehensive aerosol properties, cloudproperties, and vertical radiative flux profiles to climate researchers.
Area of studies that are greatly improved by our data set includes:1. Assimilation and prediction by global aerosol models through better
understanding of aerosol layer location.2. Better understanding of multi-layered and polar cloud systems and
their radiative impacts.3. Better understanding of frequency of occurrence of thin cirrus and
boundary layer clouds and their radiative impacts.
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CALIPSO-CloudSat-MODISmerging
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CALIPSO CloudSat MODISmerging with CERES
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Variables included in the product
• Cloud (up to 16 cloud groups within a CERESfootprint) and aerosol vertical profiles.
• CALIPSO-derived aerosol optical thickness• CALIPSO-derived aerosol types• CALIPSO-derived cloud extinction profiles• Precipitation flag from CloudSat• Atmospheric temperature, water vapor and heating
rate profiles.• MODIS derived spectral surface albedo and snow
and ocean spectral albedos from Jin’s model• MODIS derived cloud properties (ed3 and enhanced
algorithms)
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Cloud masking strategy
CALIPSO lowestunattenuatedlevel
UndetectedAttenuatedBase
CloudSat CloudBase
DetectedAttenuatedBase
CALIPSO CloudBase
DetectedNot AttenuatedBase
CALIPSO CloudBase
UndetectedNot AttenuatedBase
CloudSat CloudTop
DetectedUndetectedTop
CALIPSO CloudTop
UndetectedDetectedTop
Higher CloudTop
DetectedDetectedTop
Merged CloudBoundary
CloudSatCALIPSOCloud Boundary
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Merged clouds
Cloud occurrence within 200 vertical by 1 degree latitude layers
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Enhanced CERES-MODIScloud algorithm
• Change MODIS-derived cloud topheight to match CALIPSO-CloudSatderived cloud top height.
• If 0.3 < tau < 2 then place MODIS cloudtop at tau/2
• If tau>2 then place MODIS cloud top attau = 1.
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Flux computations
• CALIPSO-CloudSat cloud mask.• CALIPSO and CloudSat derived extinction
profiles are scaled by MODIS derived opticalthickness.
• MODIS derived cloud particle size.• CALIPSO-derived aerosol optical thickness.• If CALIPSO aerosols are not available,
MODIS-derived or MATCH aerosol opticalthickness.
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Heating rate profile
Radiative effect of Cirrus, cloud overlap, cloud-aerosol overlap
Co-latitude
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Comparison with CERES fluxes
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Preliminary comparison(1 orbit)
1.0(19.2)
8.8(47.5)
CALIPSO+CloudSat+ Enhancedclouds (W m^-2)
-1.3(24.0)
12.6(50.0)
CALIPSO+CloudSat + Ed3 clouds(W m^-2)
LWModel - Obs.(RMS Diff.)
SWModel - Obs.(RMS Diff.)
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Cloud vertical correlation length
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Flow schematic of C3M processing
Clouds
SARB
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Schedule
• 2008: Validation of the product• 2008: Comparison with CloudSat
heating profiles• Production: Spring 09, starting from July
2006.
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Backups
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CALIPSO, CloudSat, CERES,and MODIS (C3M)
• Cloud and aerosol vertical profiles derived fromCALIPSO and CloudSat are collocated
• CALIPSO and CloudSat cloud profiles are groupedand saved up to 16 different profiles.
• All MODIS-derived cloud and aerosol properties thatare included in SSF over ground track of CALIPSOand CloudSat and the entire CERES footprint areincluded
• MODIS-derived spectral surface albedo• Radiative flux profiles
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Work has been done so far
• Merged 1 month(April 2007) ofCALIPSO (VFM), CloudSat(CLOUDCLAS), and MODIS.
• Developed best cloud mask strategy• Developed surface albedo algorithm• Made the draft of C3M data catalog
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Missed by CALIPSO
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Missed by CloudSat
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CALIPSO-CloudSat-CERES-MODIS MergedProduct
Cloud overlap profilesCALIPSO and ClousSat
Cloud and aerosolpropertiesCALIPSO, CloudSat,and MODIS
TOA IrradiancesCERES
Irradiance profilesRadiative transfer model
Cloud layers Aerosol layers