HR: 1350h
AN: U23C-1451    [Abstracts]
TI: Assessment of Precision and Accuracy of GPS Radio Occultation Data From the COSMIC/ FORMOSAT-3 Mission
AU: * Schreiner, W
EM: schrein@ucar.edu
AF: University Corporation for Atmospheric Research, 3300 Mitchell Lane Suite 3410, Boulder, CO 80301, United States
AU: Hunt, D
EM: dhunt@ucar.edu
AF: University Corporation for Atmospheric Research, 3300 Mitchell Lane Suite 3410, Boulder, CO 80301, United States
AU: Kuo, B
EM: kuo@ucar.edu
AF: University Corporation for Atmospheric Research, 3300 Mitchell Lane Suite 3410, Boulder, CO 80301, United States
AU: Rocken, C
EM: rocken@ucar.edu
AF: University Corporation for Atmospheric Research, 3300 Mitchell Lane Suite 3410, Boulder, CO 80301, United States
AU: Sokolovskiy, S
EM: sergey@ucar.edu
AF: University Corporation for Atmospheric Research, 3300 Mitchell Lane Suite 3410, Boulder, CO 80301, United States
AB: The Constellation Observing System for Meteorology Ionosphere and Climate (COSMIC) / Formosa Satellite 3 (FORMOSAT-3) is a new six-satellite radio occultation (RO) mission that was successfully launched in mid-April, 2006. The UCAR COSMIC Data Analysis and Archival Center (CDAAC) receives the COSMIC data in near real- time, and performs the functions of precise orbit determination, excess phase calibration, neutral atmospheric inversion, quality control checking, and dissemination of data products to operational weather centers within 3 hours of observation. The CDAAC also generates more precise post-processed data products for climate applications. This presentation initially gives an overview of the data processing details performed at the CDAAC. Then, the presentation provides a summary assessment of COSMIC near real-time and post-processed data quality. Preliminary assessments have shown that the GPS RO data from COSMIC are of better quality than those from the previous missions and penetrate much farther down into the troposphere; from 70 to 90 percent of the soundings reach to within 1 km of the surface on a global basis. The precision of COSMIC RO refractivity profiles, estimated by comparing collocated COSMIC soundings, is shown to have an RMS difference of refractivity between 10 and 20 km altitude of less than 0.2%. The accuracy of the COSMIC soundings is also assessed via comparisons to GPS RO soundings from other missions, radiosondes, and numerical weather prediction models from NCEP and ECMWF.
UR: http://www.cosmic.ucar.edu
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0400 BIOGEOSCIENCES
DE: 0700 CRYOSPHERE (4540)
DE: 4200 OCEANOGRAPHY: GENERAL
DE: 7200 SEISMOLOGY
SC: Union [U]
MN: 2007 Fall Meeting