Accession Number:

ADA509159

Title:

Surface Wind Field Analyses of Tropical Cyclones During TCS-08: Relative Impacts of Aircraft and Remotely-Sensed Observations

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY

Personal Author(s):

Report Date:

2009-09-01

Pagination or Media Count:

98.0

Abstract:

The objective of this research is to investigate tropical cyclone wind field structure and development utilizing comprehensive observation sets collected during the Tropical Cyclone Structure 2008 TCS-08 and The Observing System Research and Predictability Experiment THORPEX Pacific Asian Regional Campaign T-PARC. Rare aircraft measurements in the western North Pacific are utilized to define surface wind distributions of TY Nuri, TY Sinlaku, and STY Jangmi. Stepped Frequency Microwave Radiometer SFMR surface winds are compared to Global Positioning System GPS dropwindsondes to determine eyewall slope and flight-level reduction factors. The combined SFMR and dropwindsonde wind speed observations are highly correlated r 0.88 with a RMSE of 2.58 m s-1. The three mature storm systems had a combined mean slant reduction factor and relative slope similar to that observed in Atlantic hurricanes. Analysis accuracy was defined by the RMSE between HWind analyses and 0-150 m-average dropwindsonde wind speeds. Satellite observations had the largest speed RMSE and the SFMR observations had the smallest speed RMSE. The ECMWF analyses had the largest intensity differences from the JTWC best-track intensity and SFMR-based analyses had the smallest intensity differences from the JTWC best-track intensity.

Subject Categories:

  • Meteorology
  • Miscellaneous Detection and Detectors
  • Atmospheric Physics
  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE