Accession Number : ADP007270

Title :   Generation of Sea Ice Geophysical Flux Estimates Utilizing a Multisensor Data Processor in Preparation for the RADARSAT and EOS Eras,

Corporate Author : JET PROPULSION LAB PASADENA CA

Personal Author(s) : Holt, Benjamin ; Kwok, Ron ; Carsey, Frank ; Curlander, John

Report Date : MAR 1992

Pagination or Media Count : 7

Abstract : A geophysical processor for deriving sea ice type and ice motion information from sequential SAR image data has been designed and is in implementation phase for use with ERS-1 SAR data at the Alaska SAR Facility (ASF). This SAR ice data processor, called the ASF Geophysical Processing System, or ASF-GPS, will be in place for launch in May 1991. Descriptions of the salient aspects of ASF-GPS and its current status are, presented. The next step in the evolution of processors for geophysical descriptions of sea ice is now in design phase; it involves the utilization of data from other sensors and sources and the generation of higher-level products. The augmented data are environmental, e.g., weather agency analyses, satellite-derived surface temperatures and drifting buoy data. These data serve to (1) improve the performance of the basic data product generation, the ice type and motion data sets, by increasing accuracy and shortening processing time, and (2) extend the level of the data products by computation of key geophysical fluxes. Geophysical quantities required from the sea ice processor include the surface heat, momentum, brine and freshwater fluxes, radiation balance, snow cover, melt pond cover and thermodynamic state. The estimation of two of these fluxes, brine and freshwater, is discussed, and the requirements for suitable environmental data are also presented. Finally, the system design of the ASF-GPS and the follow-on processor, designed initially to utilize SAR data from RADARSAT with weather and other inputs, e.g., AVHRR, and, after upgrade, from the suite of EOS instruments, will be presented.

Descriptors :   *DATA MANAGEMENT, *ICE MECHANICS, *SEA ICE, *GEOPHYSICS, *POLAR REGIONS, *DATA PROCESSING, COMPUTATIONS, HEAT, IMAGES, MELTS, OCEANS, PROTOTYPES, RADIATION, SNOW COVER, SURFACE TEMPERATURE, THERMODYNAMICS, WEATHER, ENVIRONMENTAL IMPACT, GREENHOUSE EFFECT.

Subject Categories : Meteorology
      Snow, Ice and Permafrost
      Geology, Geochemistry and Mineralogy
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE