Accession Number:

ADA179550

Title:

Atmospheric Remote Sensing in Arctic Regions,

Descriptive Note:

Corporate Author:

AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA

Report Date:

1986-01-01

Pagination or Media Count:

10.0

Abstract:

The particular features which must be considered when sensing arctic regions from space platforms include a generally dry atmosphere, thin and low water content clouds which often cover large areas, a highly reflective snow or ice background in the visible spectrum, and weak thermal contrast between snow and cloud in the thermal infrared spectrum. In recent years, more attention has been given to the problem of identifying clouds in arctic regions. An investigation of operational cloud analysis programs for arctic regions has been initiated results from this study have shown that clouds are often specified in regions which turn out to be generally cloud-free and vice versa. Some possible reasons for this error will be presented. Results of discriminating clouds from a snow background using multi spectral visible and near Infrared sensors will also be given. A new Special Sensor MicrowaveImager SSMI operating at four frequencies from 19 to 85 GHz is designed to provide estimates of several surface and atmospheric characteristics. Several parameters which will be estimated from SSMI data are of particular interest to arctic regions. These include snow parameters, sea ice attributes, cloud amount over snow, cloud liquid water content, soil moisture, and land surface temperature. As an example of parameter retrieval from SSMI data, the basis for estimating cloud amount over a snow surface will be discussed. Retrieval algorithms have been developed which lead to temperature profiles on a global scale. In addition, a microwave system operating in the 183 GHz water absorption band is being developed which will provide estimates of water vapor profiles.

Subject Categories:

  • Atmospheric Physics
  • Snow, Ice and Permafrost
  • Infrared Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE