There is strong evidence of an increase in primary production (PP) in the Arctic Ocean (AO) over the last two decades. Further increases will depend on the interplay between decreasing light limitation for primary producers, as the sea ice extent and thickness decrease, and the availability of nutrients, which is controlled by, but not limited to, inputs from the Atlantic and the Pacific Oceans. While these inputs are the major nutrient sources to the AO, ocean vertical mixing is required to bring the nutrients into the photic zone. We analyze data collected in the Western Eurasian Basin (WEB) between 1980 and 2016 and characterize the nutrient climatology of the various water masses. We conclude that there were no significant trends in the concentrations of the two macronutrients that typically limit PP in the AO (nitrate and silicic acid, in the case of diatoms), except a decreasing trend for silicic acid in Polar Surface Water (PSW), which is consistent with the reported increase in PP in the AO. We suggest that the Whalers Bay polynya, located in the northwestern corner of Svalbard, may act as a mixing hotspot, creating patches of nutrient replenished PSW. These patches may then be advected to higher latitudes under the ice pack, later boosting PP upon release from light limitation or else, keeping a nutrient reservoir that may be used in a subsequent growth season. It is likely that this remaining nutrient reservoir will decrease as sea ice cover retreats and light limitation alleviates.

中文翻译：

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北冰洋大西洋区水团中的营养素：时间趋势、混合以及与初级生产的联系

有强有力的证据表明，在过去的二十年中，北冰洋 (AO) 的初级生产 (PP) 有所增加。进一步增加将取决于初级生产者的光照限制减少（随着海冰范围和厚度的减少）与营养物质的可用性（由但不限于大西洋和太平洋的输入控制）之间的相互作用。虽然这些输入是 AO 的主要营养来源，但需要海洋垂直混合才能将营养物质带入光区。我们分析了 1980 年至 2016 年在西欧亚盆地 (WEB) 收集的数据，并描述了各种水团的营养气候学特征。我们得出的结论是，通常限制 AO 中 PP 的两种常量营养素（硝酸盐和硅酸、在硅藻的情况下），除了极性地表水 (PSW) 中硅酸的下降趋势，这与报道的 AO 中 PP 的增加一致。我们认为，位于斯瓦尔巴群岛西北角的捕鲸人湾冰间湖可能是一个混合热点，形成了营养补充的 PSW 斑块。然后，这些斑块可能会在冰袋下平流到更高的纬度，稍后在从光照限制中释放后提高 PP，或者保持一个营养库，可用于随后的生长季节。随着海冰覆盖的消退和光照限制的减轻，这个剩余的营养库可能会减少。位于斯瓦尔巴群岛的西北角，可能是一个混合热点，形成了营养补充的 PSW 斑块。然后，这些斑块可能会在冰袋下平流到更高的纬度，稍后在从光照限制中释放后提高 PP，或者保持一个营养库，可用于随后的生长季节。随着海冰覆盖的消退和光照限制的减轻，这个剩余的营养库可能会减少。位于斯瓦尔巴群岛的西北角，可能是一个混合热点，形成了营养补充的 PSW 斑块。然后，这些斑块可能会在冰袋下平流到更高的纬度，稍后在从光照限制中释放后提高 PP，或者保持一个营养库，可用于随后的生长季节。随着海冰覆盖的消退和光照限制的减轻，这个剩余的营养库可能会减少。