ISLSCP II Monthly Snow-Free Albedo, 1982-1998, and Background Soil Reflectance

Metadata Updated: November 5, 2019

This data set contains monthly average snow-free surface shortwave albedo calculated for the period 1982-1998 and estimates of background soil/litter reflectances in the visible (0.4-0.7 mm) and near-infrared (NIR) (0.7-1.0 mm) wavelengths. Biophysical Parameters derived from the FASIR-NDVI (Fourier Adjusted, Solar zenith angle correction, Interpolation, and Reconstruction of Normalized Difference Vegetation Index) data set developed for the ISLSCP Initiative II data collection for the months of January 1982 through December 1998 were used to calculate monthly mean surface albedos at 1 X 1 degree spatial resolution for vegetated land surfaces (Sellers et al, 1996b) for the wavelength interval from 0.4 to 3.0 mm. The instantaneous albedo is a function of the properties of the land surface and the solar zenith angle. The monthly mean albedo is an average weighted over time weighted by the incident radiation. NDVI data are used to generate the biophysical parameters leaf area index (LAI) and green fraction of vegetation (Greenness) used by the canopy radiative transfer model of the Simple Biosphere (SiB2) model (Sellers et al, 1996a), which computes the instantaneous albedo. This is coupled to the Colorado State University (CSU) General Circulation Model (GCM) (Randall et al, 1989) which integrates the SiB2 radiative transfer through time. The incident radiation for weighting the time-averaged albedo was provided by a previous run of the GCM using the atmospheric radiation parameterization of Harshvardhan et al (1987). The Harshvardhan parameterization models radiative transfer through the atmosphere in both the longwave and shortwave bands, including the effects of cloudiness and water vapor, carbon dioxide and ozone. The shortwave radiation distinguishes between the direct and diffuse components of the solar beam.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date August 1, 2018
Metadata Updated Date November 5, 2019

Metadata Source

Harvested from NASA Data.json

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Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date November 5, 2019
Publisher ORNL_DAAC
Unique Identifier C179003728-ORNL_DAAC
Maintainer
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Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Citation Dazlich, D.A., S.O. Los, F.G. Hall, G.J. Collatz, B.W. Meeson, E.Brown De Colstoun, and D.R. Landis. 2009. ISLSCP II Monthly Snow-Free Albedo, 1982-1998, and Background Soil Reflectance. ORNL DAAC, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/956
Graphic Preview Description Browse Image
Graphic Preview File https://daac.ornl.gov/graphics/browse/sdat-tds/956_1_fit.png
Harvest Object Id 4b68a052-a770-41a4-a3dc-9de3b5a9d478
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2010-01-25
Homepage URL https://doi.org/10.3334/ORNLDAAC/956
Language en-US
Metadata Type geospatial
Data Last Modified 2019-04-15
Program Code 026:001
Source Datajson Identifier True
Source Hash 570710fdca5643d421aa19f07949a411ee18566f
Source Schema Version 1.1
Spatial -180.0 -90.0 180.0 90.0
Temporal 1982-01-01T00:00:00Z/1998-12-31T23:59:59Z
Category ISLSCP II, geospatial

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