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Conservative and non-conservative variations of total alkalinity on the southeastern Bering Sea shelf

机译：白令海东南陆架总碱度的保守和非保守变化

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Recent observations of calcium carbonate (CaCO_3) mineral undersaturations on the Bering Sea shelf have prompted new interest in the physical and biological factors that control the inorganic carbon system in the region. Understanding of the dynamics that influence the spatio-temporal variability of total alkalinity (TA) - one major component of the seawater carbonate system - has been constrained by limited historical data collected across the shelf, and the consensus has been that TA is largely conservative. However, the recently documented undersaturated conditions have the potential to cause substantial non-conservative variability in TA in this region through the dissolution of carbonate minerals. In order to quantify the contribution of carbonate mineral precipitation and dissolution to variability in TA on the southeastern Bering Sea shelf, we examined seasonal observations of TA that were made between 2008 and 2010 as part of the BEST-BSIERP Bering Sea Project. Conservative influences accounted for most of the variability in TA concentrations, with well-constrained mixing dominating in spring and summer of 2008. Bering Shelf Water (BSW) contained a constant ratio of TA to salinity, while river discharge (RW) added TA relative to salinity at a predictable rate. Although substantial organic carbon production and denitrification can cause some non-conservative variation in TA concentrations (a maximum of-15 μmol kg SW~(-1) combined), carbonate mineral dissolution and precipitation were shown to be the most important processes responsible for non-conservative TA-salinity relationships. CaCO_3 uptake by the dominant pelagic phytoplankton calcifier (i.e., coccolithophores) was shown to alter TA concentrations by as much as 59 μmol kg SW~(-1). Evidence for shallow-water CaCO_3 mineral dissolution was also observed, which caused TA concentrations to increase by as much as 36 μmol kg SW~(-1). Therefore, contrary to our previous understanding, the non-conservative physico-biogeochemical factors observed in this study play an important role in controlling the ocean carbon cycle of the Bering Sea shelf.
机译：白令海陆架上碳酸钙（CaCO_3）矿物不饱和度的最新观察结果引起了人们对控制该地区无机碳系统的物理和生物因素的新兴趣。对影响总碱度（TA）时空变化的动力学的理解-海水碳酸盐系统的主要组成部分-受整个架子收集的有限历史数据的限制，并且普遍认为TA在很大程度上是保守的。然而，最近记录的欠饱和条件有可能通过溶解碳酸盐矿物而在该区域的TA中引起很大的非保守变异性。为了量化碳酸盐矿物沉淀和溶解对白令海东南陆架TA变异性的贡献，我们研究了BEST-BSIERP白令海项目的一部分，该观测是在2008年至2010年之间进行的。保守因素是TA浓度变化的主要原因，在2008年春季和夏季，受严格约束的混合作用占主导地位。白令陆架水（BSW）的盐度与盐度比是恒定的，而河水排放（RW）相对于盐度增加了TA盐度可预测。尽管大量的有机碳生产和反硝化会导致TA浓度发生一些非保守的变化（最大15μmolkg SW〜（-1）的总和），但碳酸盐矿物的溶解和沉淀被证明是造成非TA浓度最重要的过程。 -保守的TA盐度关系。浮游植物浮游钙质占主导地位的钙化钙（cocolioliphores）吸收可改变TA浓度达59μmolkg SW〜（-1）。还观察到CaCO_3浅水矿物溶解的证据，这使TA浓度增加了多达36μmolkg SW〜（-1）。因此，与我们先前的理解相反，本研究中观察到的非保守物理生物地球化学因素在控制白令海陆架的海洋碳循环中起着重要作用。

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