AbstractAntarctic Intermediate Water (AAIW) formation constitutes an important mechanism for the export of macr'/> Variability of nutrients and carbon dioxide in the Antarctic Intermediate Water between 1990 and 2014
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Variability of nutrients and carbon dioxide in the Antarctic Intermediate Water between 1990 and 2014

机译：1990年至2014年之间南极中间水中养分和二氧化碳的变化

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AbstractAntarctic Intermediate Water (AAIW) formation constitutes an important mechanism for the export of macronutrients out of the Southern Ocean that fuels primary production in low latitudes. We used quality-controlled gridded data from five hydrographic cruises between 1990 and 2014 to examine decadal variability in nutrients and dissolved inorganic carbon (DIC) in the AAIW (neutral density range 27 Emphasis Type="Italic">γn<  27.4) along the Prime Meridian. Significant positive trends were found in DIC (0.70 ± 0.4μmol kg− 1year− 1) and nitrate (0.08 ± 0.06μmol kg− 1year− 1) along with decreasing trends in temperature (− 0.015 ± 0.01∘C year− 1) and salinity (− 0.003 ± 0.002 year− 1) in the AAIW. Accompanying this is an increase in apparent oxygen utilization (AOU, 0.16 ± 0.07μmol kg− 1year− 1). We estimated that 75% of the DIC change has an anthropogenic origin. The remainder of the trends support a scenario of a strengthening of the upper-ocean overturning circulation in the Atlantic sector of the Southern Ocean in response to the positive trend in the Southern Annular Mode. A decrease in net primary productivity (more nutrients unutilized) in the source waters of the AAIW could have contributed as well but cannot fully explain all observed changes.
机译： Abstract 南极中间水（AAIW）的形成是大量营养素出口的重要机制离开南大洋，为低纬度地区的初级生产提供燃料。我们使用了1990年至2014年之间五个水文巡航的质量控制网格数据，来研究AAIW（中性密度范围27 Emphasis Type =“ Italic”>γ）中养分和可溶性无机碳（DIC）的年代际变化。 n <27.4）沿本初子午线。 DIC（0.70±0.4 μ mol kg − 1 year − 1 ）和硝酸盐（0.08 ±0.06 μ mol kg <上标> − 1 year − 1 ），同时温度下降趋势（− 0.015±0.01 ∘ C年<上标> − 1 ）和盐度（− 0.003±0.002年<上标> − 1 ）。随之而来的是表观耗氧量的增加（AOU，0.16±0.07 μ mol kg − 1 year − 1 ） 。我们估计75％的DIC变化具有人为起源。其余趋势支持以下情景：响应于南部环形模式的积极趋势，加强南大洋大西洋区域上层海洋翻转的环流。 AAIW的源水净初级生产力的下降（更多的未利用养分）也有贡献，但不能完全解释所有观察到的变化。

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