Journal of Oceanography, Vol. 54 (No. 5), pp. 443-456, 1998
School of Marine Science and Technology, Tokai University, 3-20-1, Orido, Shimizu, Shizuoka 424-8610, Japan
(Received 31 March 1998; in revised form 25 May 1998; accepted 27 May 1998)
Abstract: Data sets of surface wind and wind-stress fields in the North Pacific from September 1996 to June 1997 have been constructed using NASA Scatterometer (NSCAT) data on-board ADEOS to investigate their variability and implications for the wind-driven oceanic circulation. Using a weighting function decreasing with the distance between each grid and data points, and of Gaussian type for time, daily, 10-day and monthly averages are calculated for each 1° 1° grid. Products are validated by comparison with those calculated from in-situ measurement data at oceanic buoys around Japan (JMA) and in the equatorial area (TAO). The RMS differences for wind direction and speed never exceed 20° and 2 m s-1, respectively, for the TAO buoys. This does not hold for data taken by JMA buoys, suggesting that the reliability in the mid-latitudes is not good for time averages shorter than several days. Zonal integration of the Sverdrup transport in a zone of 28°-30°N calculated from the monthly-mean products ranges between 25 and 60 106 m3s-1(Sv) around its mean of 38 Sv. These are not so different from the Kuroshio transport values calculated from oceanic measurements.