Accession Number : AD1037267

Title :   Changes in the Albedo of the Pegasus and Phoenix Runways, 2000-2017

Descriptive Note : Technical Report

Corporate Author : U.S. Army Engineer Research and Development Center, Cold Regions Research and Engineering Laboratory Hanover United States

Personal Author(s) : Deeb,Elias J ; Morriss,Blaine F ; Daly,Steven F ; Haehnel,Robert B

Full Text :

Report Date : 18 Jul 2017

Pagination or Media Count : 22

Abstract : Albedo is the ratio of total hemispherical reflected (upwelling) to incoming (down welling) radiative flux (or irradiance) at a surface. For operations on the McMurdo Ice Shelf, Antarctica, albedo is a controlling factor. Impurities such as dust, soot, mineral, and other organic deposits on a snow or ice surface can dramatically lower albedo, increase solar energy absorption in the ice shelf, and significantly alter the energy balance, resulting in increased melting, snow density variations, and compromised structural integrity of the snow and ice matrix. The occurrence of such impurities at Pegasus Runway may have been a factor in its decline and replacement with the Phoenix Runway in the 20162017 field season. Therefore, the National Science Foundation (NSF) requested that the U.S. Army Cold Regions Research and Engineering Laboratory (CRREL) establish a long-term record of surface albedo at the Pegasus and Phoenix Runway sites. To accomplish this, data from the National Aeronautics and Space Administration (NASA) Moderate Resolution Imaging Spectroradiometer (MODIS) satellite was used. MODIS satellite data has a daily temporal resolution and a significant period of record (2000present). Additionally, its narrowband surface reflectance may be used as a proxy for albedo. This report documents the results of these analyses.

Descriptors :   electromagnetic spectra , remote sensing , atmospheres , solar energy , reflectance , aircrafts , heat transfer , distortion , broadband , grids , digital data , high latitudes , ANTARCTICA , snow , HEAT TRANSMISSION , cold regions , observation , runways , RADIOMETERS

Subject Categories : Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE