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首页> 外文期刊>Biogeosciences >Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics in the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach
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Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics in the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach

机译：基于硝酸盐双同位素组成法的长江流域和黑潮对东海北部陆架硝酸盐动态的季节性变化

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摘要

The northern East China Sea (ECS) serves as a spawning and nursery ground for many species of fish and squid. To clarify the basis of the food web in the northern ECS, we examined the nitrate (NO_3) dynamics along four latitudinal transects based on stable nitrogen and oxygen isotopes of NO_3 (δ~(15)N_(NO_3) and δ~(18)O_(NO_3)) and temperature- salinity dynamics in both winter (February 2009) and summer (July 2009 and July 2011). The δ~(15)N_(NO_3) and δ~(18)O_(NO_3), which were distinctly different among the potential NO_3 sources, were useful for clarifying NO_3 sources and its actual usage by phytoplankton. In winter, Kuroshio SubsurfaceWater (KSSW) and the Yellow Sea Mixed Water (YSMW) predominantly contributed to NO_3 distributed in the shelf water. In the surface water of the Okinawa Trough, NO_3 from the KSSW, along with a temperature increase caused by an intrusion of Kuroshio Surface Water (KSW), seemed to stimulate phytoplankton growth. In summer, Changjiang Diluted Water (CDW), Yellow Sea Cold Water Mass (YSCWM), and KSSW affected the distribution and abundance of NO_3 in the northern ECS, depending on precipitation in the Changjiang drainage basin and the development of the YSCWM in the shelf bottom water. Although isotopic fractionation during NO_3 uptake by phytoplankton seemed to drastically increase δ~(15)N_(NO_3) and δ~(18)O_(NO_3) in summer, relatively light nitrate with δ~(15)N_(NO_3) lower than expected from this fractionation effect might be explained by contribution of atmospheric nitrogen and/or nitrification to NO_3 dynamics in the surface and subsurface layers. If the latter were a dominant process, this would imply a tightly coupled nitrogen cycle in the shelf water of the northern ECS.
机译：东海北部（ECS）是许多鱼类和鱿鱼的产卵场和苗圃场。为了弄清北部ECS的食物网基础，我们基于NO_3（δ〜（15）N_（NO_3）和δ〜（18）的稳定氮和氧同位素研究了沿四个纬线样面的硝酸盐（NO_3）动力学。冬季（2009年2月）和夏季（2009年7月和2011年7月）的O_（NO_3）和温度盐分动态。在潜在的NO_3来源之间明显不同的δ〜（15）N_（NO_3）和δ〜（18）O_（NO_3）可用于阐明浮游植物的NO_3来源及其实际用途。在冬季，黑潮地下水（KSSW）和黄海混合水（YSMW）主要是造成架子水中NO_3分布的原因。在冲绳海槽的地表水中，来自KSSW的NO_3以及由于黑潮地表水（KSW）的入侵而引起的温度升高似乎刺激了浮游植物的生长。夏季，长江稀释水（CDW），黄海冷水团（YSCWM）和KSSW影响了长江三角洲北部ECS中NO_3的分布和丰度，这取决于长江流域的降水量和架子上YSCWM的发展。底水。尽管在夏季浮游植物吸收NO_3期间的同位素分馏似乎使δ〜（15）N_（NO_3）和δ〜（18）O_（NO_3）急剧增加，但相对较轻的硝酸盐的δ〜（15）N_（NO_3）却比预期的要低。这种分馏效应的产生可能是由于大气氮和/或硝化作用对表层和地下层NO_3动力学的贡献。如果后者是主要过程，则意味着北部ECS架子水的氮循环紧密耦合。

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