Filed measurements of spatial structure and temporal variation of coastal boundary layer in the open coast.

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In order to understand the effects of meso-scale Kuroshio fluctuation on the coastal current system, field experiments to measure the velocity and water qualities were performed in 1999. The results show that the abrupt approach of Kuroshio current to the Kashima coast induce the strong southward current on the whole coastal region and the Kuroshio-Oyashio mixed water intrudes to the coast from the northern offshore area with the sharp temperature and salinity front. The frontal eddies of Kuroshio current have the other remarkable influence to the coast. The warm water from frontal eddies intrudes to the surface layer of the shelf sea with about 20m of thickness. Moreover spatial distribution and temporal variability of nutrient salt and Cholorophyll-a at the Kashima coast were performed in 2000. The results show that the nutrient field in the costal region is affected by the phosphorus rich water from the offshore bottom layer in spring and summer, while the nitrogen rich surface nearshore water dominates in autumn. The special distribution and its temporal variation of the Chlorophyll -a in the shelf sea region are well correlated to the nutrient variation.