[Parameters: Topic='ATMOSPHERE', Term='CLOUDS', Variable_Level_1='CLOUD FORCING']
International Satellite Cloud Climatology Project (ISCCP) Stage DX Pixel Level Cloud Product - Revised Algorithm in Native Data FormatEntry ID: ISCCP_DX_NAT
Abstract: The ISCCP_DX_NAT data set contains 3-hourly, 30 KM equal-area grid data in native file format from various polar and geostationary satellites. Pixel Level Cloud Product contents include calibrated radiances, cloud detection results, cloud and surface properties from radiative analysis.
The International Satellite Cloud Climatology Project (ISCCP), the first project of the World Climate Research ... Program (WCRP), was established in 1982 (WMO-35 1982, Schiffer and Rossow 1983):
- To produce a global, reduced resolution, calibrated and normalized radiance data set containing basic information on the properties of the atmosphere from which cloud parameters can be derived.
- To stimulate and coordinate basic research on techniques for inferring the physical properties of clouds from the condensed radiance data set and to apply the resulting algorithms to derive and validate a global cloud climatology for improving the parameterization of clouds in climate models.
- To promote research using ISCCP data that contributes to improved understanding of the Earth's radiation budget and hydrological cycle.
Since 1983 an international group of institutions has collected and analyzed satellite radiance measurements from up to five geostationary and two polar orbiting satellites to infer the global distribution of cloud properties and their diurnal, seasonal and interannual variations. The primary focus of the first phase of the project (1983-1995) was the elucidation of the role of clouds in the radiation budget (top of the atmosphere and surface). In the second phase of the project (1995 onwards) the analysis also concerns improving understanding of clouds in the global hydrological cycle.
The ISCCP analysis combines satellite-measured radiances (Stage B3 data, Schiffer and Rossow 1985), Rossow et al. 1987) with the TOVS atmospheric temperature-humidity and ice/snow correlative data sets to obtain information about clouds and the surface. The analysis method first determines the presence of absence of clouds in each individual image pixel and retrieves the radiometric properties of the cloud for each cloudy pixel and of the surface for each clear pixel. The pixel analysis is performed separately for each satellite radiance data set and the results reported in the Stage DX data product, which has a nominal resolution of 30 km and 3 hours. The Stage D1 product is produced by summarizing the pixel-level results every 3 hours on an equal-area map with 280 km resolution and merging the results from separate satellites with the atmospheric and ice/snow data sets to produce global coverage at each time. The Stage D2 data product is produced by averaging the Stage D1 data over each month, first at each of the eight three hour time intervals and then over all time intervals.
Start Date: 1983-07-01Stop Date: 2009-12-31
ATMOSPHERE > ATMOSPHERIC PRESSURE > ATMOSPHERIC PRESSURE MEASUREMENTS
ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE AIR TEMPERATURE
ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY
ATMOSPHERE > CLOUDS > CLOUD RADIATIVE TRANSFER > CLOUD RADIATIVE FORCING
ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD TOP PRESSURE
ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD TOP TEMPERATURE
ATMOSPHERE > CLOUDS > CLOUD TYPES
ATMOSPHERE > ATMOSPHERIC RADIATION > ALBEDO
ATMOSPHERE > ATMOSPHERIC RADIATION > REFLECTANCE
ATMOSPHERE > ATMOSPHERIC RADIATION > SOLAR RADIATION
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED FLUX
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE FLUX
Role: TECHNICAL CONTACT
Email: wbrossow at ccny.cuny.edu
NASA/Goddard Institute for Space Studies 2880 Broadway
City: New York
Province or State: NY
Postal Code: 10025
Role: DIF AUTHOR
Email: support-asdc at earthdata.nasa.gov
NASA Langley Atmospheric Science Data Center User and Data Services NASA Langley Research Center Mail Stop 157D
Province or State: VA
Postal Code: 23681-2199
Rossow, W.B., A. Walker, D. Beuschel and M. Roiter, 1996: International
Cloud Climatology Project (ISCCP) Documentation of New Cloud Datasets,
World Meteorological Organization, Geneva, 115 pp.
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Creation and Review Dates
Last DIF Revision Date: 2014-04-07