TOGA-COARE集中観測期間中の混合層の構造と海面フラックスの評価

Abstract

The surface and aerological observations made by the Japanese research vessel Hakuho-maru on 11-27 November, 1992 at 0°, 156°E during TOGA-COARE IOP period were used to analyze the evolution and structure of mixed layer over the ocean, and to estimate surface fluxes by using bulk schemes. The Part I of this study is devoted to the problem of the mixed layer. The main finding is that the regional wind field can greatly modify the structure of the mixed layer. For the east trade régime, the mixed layer had a relatively great depth, mostly reaching 800-900m. Above this level was a dry layer without any significant inversion. For the west wind régime created by four westerly wind bursts, the height of the mixed layer was considerably depressed, or even disappeared. A deep saturation layer was often observed.Two events of the intrusion of the extremely dry air layer greatly enhanced and elevated the mixed layer, up to about 1.5km. The reason for these events was discussed.