Accession Number:

ADA467189

Title:

Application of the Community Radiative Transfer Model to Evaluate Satellite-Based Measurements Across the African Easterly Jet Over Western Africa

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY

Personal Author(s):

Report Date:

2007-03-01

Pagination or Media Count:

90.0

Abstract:

The Community Radiative Transfer Model CRTM has been used to determine which polar-orbiter satellite channels are best suited to remotely sense in a cloud-free environment the lower-tropospheric temperature and moisture gradients that determine the location and intensity of the African Easterly Jet over West Africa. This study evaluates the capability of five microwave sensors and three infrared sensors, including both conical- and cross-track scanning instruments. Atmospheric profiles obtained during the JET2000 field experiment blended with the European Center for Medium-range Weather Forecasting model analyses are input in the CRTM to obtain brightness temperature outputs. To address separately the moisture temperature signature, the average of the northern and southern temperature moisture profiles were combined with the real moisture temperature profiles. The effects of land surface emissivity uncertainty of -3 for microwave and -1 for infrared were tested. From the total set of 423 channels evaluated, 11 microwave and 21 infrared channels were found appropriate for obtaining moisture gradient information, but after applying emissivity perturbations this list was reduced to two microwave and 20 infrared channels. Temperature gradient information was determined to be available from 35 microwave channels and 95 infrared channels, with no impacts noted due to emissivity perturbations.

Subject Categories:

  • Cybernetics
  • Infrared Detection and Detectors
  • Thermodynamics
  • Spacecraft Trajectories and Reentry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE