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Clouds and the Earth's Radiant Energy System (CERES) Monthly Gridded Cloud Averages (ISCCP-D2like-Day/Nit) Data Set Abstract

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Table of Contents:

  1. Data Set Description
  2. Summary of Changes
  3. References
  4. Contact Information
  5. Acknowledgment

Data Set Description:

The Monthly Gridded Cloud Averages (ISCCP-D2like-day/nit), archival data product contains 3-hourly (GMT based) monthly and monthly 1° gridded regional mean cloud properties as a function of 18 cloud types, similar to the ISCCP D2 product, where the cloud properties are stratified by pressure, optical depth and phase. There is a dataset for Terra-MODIS and Aqua-MODIS as well as a day and nighttime dataset. The retrievals and therefore the quality are different for each dataset. For the MODIS based ISCCP D2-like products the cloud amounts for 42 cloud types, similar to the ISCCP D1 product, is also available. Input to the Subsystem is the Single Scanner Footprint TOA/Surface Fluxes and Clouds (SSF) archival data product. Each ISCCP-D2like covers a single month, using the SSF based on the CERES instrument, which is in cross-track scan mode. The science data are Scientific Data Sets (SDSs) with multiple records. Each record contains spatially averaged data for an individual region. The following tables are helpful in recognizing the structure of the HDF output.

ISCCP-D2like 18 Cloud types for MODIS
ISCCP-D2like 18 Cloud types for MODIS.


Cloud parameters for the ISCCP-D2like
18 Cloud types for MODIS
Article I. Cloud Parameter
Cloud Fraction
Effective Pressure
Effective Temperature
Optical Depth
Liquid/Ice Water Path
Particle size (liq radius, ice diameter)
Infrared Emissivity
 
# of obs/GMT box

ISCCP-D2like 42 Cloud types for MODIS daytime cloud amounts.
For each cloud type the total, liquid and ice cloud amounts are given.
ISCCP-D2like 42 Cloud types for MODIS daytime cloud amounts.


Additional information about the format and content of the ISCCP-D2like can be found in the CERES Data Products Catalog. A detailed description of the ISCCP-D2like can be found in the SFC Collection Guide. The Collection Guide is not yet available.

Summary of Changes:

The CERES Data Management Team and the Langley Atmospheric Science Data Center (ASDC) use a Sampling Strategy, a Production Strategy, and a Configuration Code (CCode) to track versions of CERES primary data products. In general, minor reprocessing changes are tracked by increasing the Configuration Code while major reprocessing changes result in a new Production Strategy. The Sampling Strategy identifies the satellite and instruments which acquired the data in the product.

A summary of changes made to the CERES ISCCP product is shown in the following tables.

Modification History for: Aqua | Terra

Modification History of the CERES ISCCP-D2like Aqua Product
Also see Modification History for CERES SSF Aqua FM3 and FM4
Sampling Strategy and
Production Strategy
CCode Available
at ASDC
Impact on ISCCP-D2like Product
Aqua-FM3-MODIS_Edition2A (4)
Aqua-FM4-MODIS_Edition2A (4)
024031 Jun 2010
  • Code was updated to correct the error found in Liquid and Ice cloud fraction data.
  • Code was updated to set Cloud Optical Depth values between 0.0 - 128.0 range to make it a standard for all ISCCP-D2like products.
  • Edition2B, Edition2F SSF data are used as inputs.
Aqua-FM3-MODIS_Beta1 (3)
Aqua-FM4-MODIS_Beta1 (3)
023030 Oct 2008
  • Edition2B, Edition2C SSF data are used as inputs.
Availability: (1) not available; (2) restricted to CERES analysts; (3) restricted to CERES Science Team and analysts; (4) public

Modification History for: Aqua | Terra

Modification History of the CERES ISCCP-D2like Terra Product
Also see Modification History for CERES SSF Terra FM1 and FM2
Sampling Strategy and
Production Strategy
CCode Available
at ASDC
Impact on ISCCP-D2like Product
Terra-FM1-MODIS_Edition2A (4)
Terra-FM2-MODIS_Edition2A (4)
024031 Jun 2010
  • Code was updated to correct the error found in Liquid and Ice cloud fraction data.
  • Code was updated to set Cloud Optical Depth values between 0.0 - 128.0 range to make it a standard for all ISCCP-D2like products.
  • Edition2B, Edition2F SSF data are used as inputs
Terra-FM1-MODIS_Beta1 (3)
Terra-FM2-MODIS_Beta1 (3)
023030 Oct 2008
  • Edition2B, Edition2F SSF data are used as inputs
Availability: (1) not available; (2) restricted to CERES analysts; (3) restricted to CERES Science Team and analysts; (4) public

References:

The first two references describe the CERES_MODIS cloud retrieval algorithm. The third reference explains the cloud optical depth gamm distribution assumption. The last reference outlines the GGEO cloud retrieval Layered Bispectral Threshold Model (LBTM) algorithm and is a subset of the MODIS algorithm. Further references of validation and quality of MODIS and GEO cloud retrievals can be found on the CERES reference page from the NASA Langley Cloud and Radiation Group Home Page.

Contact Information:

Investigator(s) Name and Title Technical Contact(s) Data Center
Norman G. Loeb
CERES Interdisciplinary Principal Investigator
E-mail: norman.g.loeb@nasa.gov
Telephone: (757) 864-5688
David R. Doelling
E-mail: david.r.doelling@nasa.gov
Telephone: (757) 864-2155

Atmospheric Sciences Research
Mail Stop 420
NASA Langley Research Center
Hampton, Virginia 23681-2199
USA
FAX: (757) 864-7996

User and Data Services Office
Atmospheric Science Data Center
NASA Langley Research Center
Mail Stop 157D
Hampton, Virginia 23681-2199
USA
Telephone: (757) 864-8656
FAX: (757) 864-8807
E-mail: larc-asdc-uds@lists.nasa.gov
URL: http://eosweb.larc.nasa.gov

Acknowledgment:

The requested form of acknowledgment for any publication in which these data are used is:

"These data were obtained from the NASA Langley Research Center Atmospheric Science Data Center."

The Langley Data Center requests a reprint of any published papers or reports or a brief description of other uses (e.g., posters, oral presentations, etc.) of data that we have distributed. This will help the Data Center determine the use of data distributed, which is helpful in optimizing product development. It also helps us to keep our product related references current.

Reference:

The CERES Team has gone to considerable trouble to remove major errors and to verify the quality and accuracy of these data. Please provide a reference to the following paper when you publish scientific results with the CERES data:

Wielicki, B. A., B. R. Barkstrom, E. F. Harrison, R. B. Lee III, G. L. Smith, and J. E. Cooper, "Clouds and the Earth's Radiant Energy System (CERES): An Earth Observing System Experiment," Bull. Amer. Meteor. Soc., 77, 853-868, 1996.

Web Page Information:

Document Creation Date: October 10, 2008
Review Date: Jul 2012
Modification History: Jul 2010, Jul 2012
Last Date Modified: Jul 5, 2012
Document ID:
Author: User and Data Services, Langley ASDC
ASDC Help Desk: Phone (757) 864-8656; E-mail: larc-asdc-uds@lists.nasa.gov
URL: http://eosweb.larc.nasa.gov/GUIDE/dataset_documents/cer_isccp-d2like.html

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