Seasonal changes and vertical distributions of chlorogphyll a and primary procuctivity at the Yamato Rise, central Japan Sea
Seasonal changes and vertical distributions of chlorogphyll a and primary procuctivity at the Yamato Rise, central Japan Sea
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日本海中部大和隆起叶绿素a和初级生产力的季节变化及垂直分布
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
H. Nagata
中科院分区：
文献类型：
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作者：
H. Nagata
1994 ~ 1997年对日本海中部大和海隆叶绿素a（Chia a）和初级生产力的季节变化和垂直分布格局与环境条件的关系进行了研究。浮游植物的生物量和生产量在春季最大，秋季次之。与此相反，最低值被发现在冬季。夏、秋季的表层Cha和表层初级生产力值与黑潮沃茨的相应值基本相当。冬季黑潮沃茨的两个数值均低于冬季黑潮，而春季日本海中部的两个数值则明显高于冬季黑潮。同化数的垂直均匀性从表面到近底部的真光层和存在一个地下叶绿素最大值的季节分层水柱是显着的。日本海的一些独特的水文特征包括：（1）冬季大规模的对流混合，（2）冬春季营养盐丰富的次表层水提供充足的营养盐，（3）夏秋季营养线浅而明显。这些水文特征在决定这些沃茨中浮游植物生物量和生产力的时空变化方面起着重要作用。
Seasonal changes and vertical distribution patterns of chlorophyll a (Chi a) and primary productivity were investigated in relation to environmental condi tions at the Yamato Rise in the central Japan Sea from 1994 to 1997. The maximum biomass and production of phytoplankton was found in spring, with a secondary peak in autumn. In contrast, minimum values were found in winter. Surface Chi a and surface primary productivity values in summer and autumn were nearly equal to corresponding values in Kuroshio waters. However, both values were lower than those in Kuroshio waters in winter, while those in spring in the central Japan Sea were considerably higher. Vertical uniformity of assimilation numbers from the sur face to near the bottom of the euphotic layer and the existence of a subsurface Chl-a maximum in seasons with a stratified water column are notable. Some unique hydrographic features in the Japan Sea include (1) large-scale convectional mixing in winter, (2) abundant supply of nutrients from nutrient-rich subsurface water in win ter-spring, and (3) shallow and distinct nutriclines in summer and autumn. These hydrographic features play an important role in determining spatial and temporal variations in phytoplankton biomass and productivity in these waters.