Skip to main content
ORNL DAAC HomeNASA Home
DAAC Home > Get Data > NASA Projects > International Satellite Land Surface Climatology Project (ISLSCP II) > Landing page

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

Overview

DOIhttps://doi.org/10.3334/ORNLDAAC/956
Version1
Project
Published2010-01-25
Updated2023-10-15
Usage5585 downloads
Citations2 publications cited this dataset
Download Data8.4 MBUser Guide

Description

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.

Science Keywords

  • LAND SURFACE
  • SURFACE RADIATIVE PROPERTIES
  • ALBEDO
  • LAND SURFACE
  • LAND USE/LAND COVER
  • LAND USE/LAND COVER CLASSIFICATION
  • VEGETATION INDEX
  • BIOSPHERE
  • VEGETATION
  • VEGETATION INDEX
  • BIOSPHERE
  • VEGETATION
  • VEGETATION COVER
  • BIOSPHERE
  • VEGETATION
  • PLANT CHARACTERISTICS
  • BIOSPHERE
  • VEGETATION
  • LEAF CHARACTERISTICS
  • BIOSPHERE
  • VEGETATION
  • CANOPY CHARACTERISTICS
  • LAND SURFACE
  • SURFACE RADIATIVE PROPERTIES
  • REFLECTANCE

Data Use and Citation

Download citation from Datacite
RISBibTexOther
Crosscite Citation Formatter
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. https://doi.org/10.3334/ORNLDAAC/956

This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use Policy. See our Data Use and Citation Policy for more information.

Data Files

Sign in to download files.

Companion Files

Toggle Companion Files

Sign in to download files.

Dataset has 2 companion files.

  • 0_snowfree_albedo_readme.txt
  • 1_snowfree_albedo_doc.pdf

Visualize and Subset Data

Download customized subsets in user-selected projection and format using the Spatial Data Access Tool.

Advanced Data Access through THREDDS Data Server

THREDDS Data Access: ISLSCP II Monthly Snow-Free Albedo, 1982-1998, and Background Soil Reflectance THREDDS Data Access.

See our THREDDS Data Server Catalog Service page for more information.