Evaluation of Wind Vectors Observed by QuikSCAT/SeaWinds Using Ocean Buoy Data
Open Access
- 1 December 2002
- journal article
- Published by American Meteorological Society in Journal of Atmospheric and Oceanic Technology
- Vol. 19 (12), 2049-2062
- https://doi.org/10.1175/1520-0426(2002)019<2049:eowvob>2.0.co;2
Abstract
Wind vectors observed by the QuikSCAT/SeaWinds satellite mission are validated by comparing with wind and wave data from ocean buoys. Effects of oceanographic and atmospheric environment on scatterometer measurements are also assessed using the buoy data. Three versions of QuikSCAT/SeaWinds wind data were collocated with buoy observations operated by the National Data Buoy Center (NDBC), Tropical Atmosphere Ocean (TAO), and Pilot Research Moored Array in the Tropical Atlantic (PIRATA) projects, and the Japan Meteorological Agency (JMA). Only buoys located offshore and in deep water were analyzed. The temporal and spatial differences between the QuikSCAT/SeaWinds and buoy observations were limited to less than 30 min and 25 km. The buoy wind speeds were converted to equivalent neutral winds at a height of 10 m above the sea surface. The comparisons show that the wind speeds and directions observed by QuikSCAT/SeaWinds agree well with the buoy data. The root-mean-squared differences of the wind speed and direction for the standard wind data products are 1.01 m s−1 and 23°, respectively, while no significant dependencies on the wind speed or cross-track cell location are discernible. In addition, the dependencies of wind speed residuals on oceanographic and atmospheric parameters observed by buoys are examined using the collocated data. A weak positive correlation of the wind speed residuals with the significant wave height is found, while dependencies on the sea surface temperature or atmospheric stability are not physically significant.Keywords
This publication has 17 references indexed in Scilit:
- Ocean currents evident in satellite wind dataGeophysical Research Letters, 2001
- Comparisons between the TAO Buoy and NASA Scatterometer Wind VectorsJournal of Atmospheric and Oceanic Technology, 2001
- The accuracy of the NSCAT 1 vector winds: Comparisons with National Data Buoy Center buoysJournal of Geophysical Research: Oceans, 1999
- Wind observations from new satellite and research vessels agreeEos, 1997
- Validation of Vector Magnitude Datasets: Effects of Random Component ErrorsJournal of Atmospheric and Oceanic Technology, 1997
- Accounting for Surface Wave Distortion of the Marine Wind Profile in Low-Level Ocean Storms Wind MeasurementsJournal of Physical Oceanography, 1995
- Tower‐based measurements of normalized radar cross section from Lake Ontario: Evidence of wind stress dependenceJournal of Geophysical Research: Oceans, 1995
- Radar scattering and equilibrium ranges in wind‐generated waves with application to scatterometryJournal of Geophysical Research: Oceans, 1987
- The dependence ofXband microwave sea return on atmospheric stability and sea stateJournal of Geophysical Research, 1985
- The relationship between wind vector and normalized radar cross section used to derive SEASAT‐A satellite scatterometer windsJournal of Geophysical Research: Oceans, 1982