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首页> 外文期刊>Marine Chemistry >Degree of nutrient consumption of upwelled water in the Taiwan Strait based on dissolved organic phosphorus or nitrogen
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Degree of nutrient consumption of upwelled water in the Taiwan Strait based on dissolved organic phosphorus or nitrogen

机译：基于溶解性有机磷或氮的台湾海峡上升流水养分消耗程度

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Intermittent upwelling occurs in the Taiwan Strait down to the southern tip of Taiwan in Nanwan Bay. These upwelled waters are usually supersaturated with respect to CO_2, and hence may release it into the atmosphere. On the other hand, the upwelled waters also transport nutrients to the euphotic zone, thus possibly―yet somewhat paradoxically―reducing CO_2 as it is consumed through enhanced biological productivity. Since it takes a period of a few days to a few weeks for phytoplankton to fully grow, naturally, only aged upwelled water has the potential to become a CO_2 sink. To determine the relative aging status of upwelled water, this study employed a Degree of Nutrient Consumption (DNC) based on the ratio of dissolved organic phosphorus or nitrogen (DOP or DON), particulate organic phosphorus or nitrogen (POP or PON) and dissolved inorganic phosphorus or nitrogen (DIP or DIN): DNC=(DOX + POX)/(DIX + DOX + POX) where X is either P or N. Bottom waters in the aphotic zone in the Penghu Channel in the southeastern Taiwan Strait and newly upwelled surface waters there were found to be low in terms of their DNC. In general, a low DNC was noted alongside other traditionally used upwelling indicators, such as low temperature, less dissolved oxygen and low pH, but high salinity, apparent oxygen utilization, alkalinity, total CO_2, fCO_2, elevated nutrient contents and high chlorophyll a. Surface waters with a relatively lower DNC were, in fact, supersaturated with CO_2; conversely, those with a higher DNC were undersaturated.
机译：间歇上升流发生在台湾海峡，直到台湾南端的南湾湾。这些上升流的水通常相对于CO_2是过饱和的，因此可能将其释放到大气中。另一方面，涌入的水也将养分运到富营养区，因此可能（尽管有些反常）减少了由于提高的生物生产力而消耗的CO_2。由于浮游植物要完全生长需要几天到几周的时间，因此，自然地，只有老化的上升流水才有可能成为CO_2汇。为了确定上升流水的相对老化状态，本研究基于溶解有机磷或氮（DOP或DON），颗粒有机磷或氮（POP或PON）和溶解性无机物的比例，采用了养分消耗量（DNC）。磷或氮（DIP或DIN）：DNC =（DOX + POX）/（DIX + DOX + POX），其中X为P或N。台湾海峡东南部澎湖​​航道无光带的底水，并新上涌发现地表水的DNC含量较低。一般而言，与其他传统使用的上升流指标一样，DNC值也很低，例如低温，溶解氧少和pH值低，但盐度高，表观氧利用率，碱度，总CO_2，fCO_2，养分含量高和叶绿素a高。实际上，具有相对较低DNC的地表水被CO_2过饱和。相反，DNC较高的人饱和度较低。

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