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首页> 外文期刊>Journal of oceanography >Subsurface nutrient maximum and submesoscale structures in the southwestern Japan Sea
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Subsurface nutrient maximum and submesoscale structures in the southwestern Japan Sea

机译:日本西南部海域的地下养分最大值和亚尺度结构

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摘要

From summer to autumn, in the southwestern Japan Sea, the maximum subsurface nutrient (DIN: nitrate + nitrite) concentration and minimum dissolved oxygen (DO) concentration layers lie at depths of approximately 75-125 dbar. The subsurface nutrient-rich water originates from the East China Sea through the lower layer (50-100-dbar depths) of the Tsushima Straits. On a smaller scale, in the subsurface nutrient-rich layer, submesoscale structures (similar to 10 km) with high DO and chlorophyll-a (Chl-a) concentrations were observed below the surface euphotic zone and the minimum Chl-a layer in late October 2008. Considering that photosynthesis cannot occur in the minimum Chl-a layer, the submesoscale Chl-a maxima did not coincide with the normal maximum subsurface chlorophyll layer, where phytoplankton can mature, in the seasonal pycnocline in summer. The subsurface submesoscale water masses were zonally distributed from west to east downstream of the Tsushima Warm Current. In late November 2008, high DO and Chl-a water subducted from the surface density front to the subsurface layers along the isopycnal surface. In the large-scale frontal region of the Tsushima Warm Current, the subsurface isopycnals were convex upward both in October and November 2008, suggesting meso- and submesoscale upwellings.
机译:从夏季到秋季,在日本西南部海域,最大的地下营养物浓度(DIN:硝酸盐+亚硝酸盐)和最小的溶解氧浓度(DO)位于约75-125 dbar的深度。富含营养的地下水来自东海,穿过对马海峡的下层(深度为50-100dbar)。在较小的规模上,在地下营养丰富的层中,在表面富营养区以下和最低的Chl-a层下方观察到了具有高DO和叶绿素a(Chl-a)浓度的亚中尺度结构(约10 km)。 2008年10月。考虑到在最小Chl-a层中无法进行光合作用,因此在夏季季节性比多克林中,亚中尺度Chl-a最大值与正常的最大表层叶绿素层不一致,在该处,浮游植物可以成熟。在对马暖流下游,地下次中尺度水团从西向东呈带状分布。在2008年11月下旬,高溶解氧和Chl-a水从地表密度前沿沿着等深面俯冲到地下层。在对马暖流的大型额叶区域,地下等深线在2008年10月和2008年11月均向上凸起,表明中尺度和亚中尺度尺度的上升。

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