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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >The biogeochemistry of inorganic carbon and nutrients in the Pearl River estuary and the adjacent Northern South China Sea
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The biogeochemistry of inorganic carbon and nutrients in the Pearl River estuary and the adjacent Northern South China Sea

机译：珠江口及南海北部邻近地区无机碳和养分的生物地球化学。

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The Zhu-jiang (Pearl River) estuary and its adjacent continental shelf in the Northern South China Sea (SCS) is unique in that its drainage basin is located entirely in a subtropical zone with heavy population development, and therefore represents an important regime for biogeochemical studies on how large rivers influence continental shelves. The near-zero salinity end member has high nutrient concentrations (silicate 130-140 muM, nitrate 75-100 muM and phosphate 0.2-1.2 muM) and relatively high total dissolved inorganic carbon (DIC) (1500 muM) and alkalinity (similar to1650 muM) values. Water column DIC, alkalinity, and nutrient in the estuary are largely controlled by mixing of waters from different tributaries with different drainage basin chemistry, anthropogenic influence, and degree of estuarine recycling. Biological uptake of nutrients and inorganic carbon occur in the outer estuary and inner shelf areas supported by riverine nutrients. The N/P and Si/P ratios are generally very high within the estuary. The summertime area-integrated biological production rate of 0.8 gCm(-2) d(-1) is estimated based on the depletion of DIC and alkalinity relative to the conservative mixing line and a plume travel time. This estimate agrees reasonably well with C-14 based primary production rates (PP) and with that from effective river phosphate flux. Biological production decreases about 10-fold in the open continental shelf and slope and is largely supported by mixing with subsurface water. A comparison of DIC, phosphate, and nitrate concentrations in the surface mixing layer and at the bottom of the euphotic zone with the C-14-based PP (0.13 gCm(-2)d(-1)) suggests that the surface water residence time in the Northern SCS is similar to1.3 years. The N/P, Si/P, and Si/C ratios are 15, 25, and 0.15, respectively. The subtropical Pearl River study is also compared to other large rivers with regard to differences in both natural processes (i.e., weathering rates) and anthropogenic influences (i.e., nutrient input) between these different river estuary systems. (C) 2004 Elsevier Ltd. All rights reserved.
机译：南中国海（SCS）的珠江（珠江）河口及其邻近大陆架的独特之处在于其流域完全位于人口稠密的亚热带地区，因此代表了生物地球化学的重要机制研究大河如何影响大陆架。接近零的盐度末端成员具有较高的营养物浓度（硅酸盐130-140μM，硝酸盐75-100μM和磷酸盐0.2-1.2μM）以及相对较高的总溶解无机碳（DIC）（1500μM）和碱度（类似于1650μM ）值。河口DIC，碱度和养分在很大程度上受不同支流的水与流域化学特性，人为影响和河口循环利用程度的混合影响。营养物质和无机碳的生物吸收发生在河口营养物质支持的外河口和内陆架区。在河口内，N / P和Si / P比通常很高。基于相对于保守混合线的DIC消耗和碱度以及羽流传播时间，估计夏季地区生物合成速率为0.8 gCm（-2）d（-1）。该估算值与基于C-14的初级生产率（PP）以及有效的河流磷酸盐通量的估算值相当吻合。在开放的大陆架和斜坡上，生物产量下降了约10倍，并且主要由与地下水的混合来支持。与基于C-14的PP（0.13 gCm（-2）d（-1））在表面混合层和共沸区底部的DIC，磷酸盐和硝酸盐浓度的比较表明北部SCS的时间大约是1.3年。 N / P，Si / P和Si / C之比分别为15、25和0.15。在不同的河口系统之间自然过程（即风化率）和人为影响（即养分输入）方面的差异方面，也将亚热带珠江河研究与其他大型河流进行了比较。 （C）2004 Elsevier Ltd.保留所有权利。

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