Incursion of Alaska Coastal Water as a mechanism promoting small phytoplankton in the western Arctic Ocean
Incursion of Alaska Coastal Water as a mechanism promoting small phytoplankton in the western Arctic Ocean
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DOI：
10.1016/j.pocean.2021.102639
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发表时间：
2021-07
影响因子：
4.1
通讯作者：
Yanpei Zhuang;Haiyan Jin;Yang Zhang;Hongliang Li;Tianzhen Zhang;Yangjie Li;Youcheng Bai;Jian Ren;Jianfang Chen
中科院分区：
文献类型：
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作者：
Yanpei Zhuang;Haiyan Jin;Yang Zhang;Hongliang Li;Tianzhen Zhang;Yangjie Li;Youcheng Bai;Jian Ren;Jianfang Chen
阿拉斯加沿海水 (ACW) 的流入是北冰洋的热量和淡水来源，有助于生态系统演替和浮游植物变化。为了探索浮游植物组成对 ACW 的响应机制和模式，对 2008 年至 2016 年夏季北冰洋陆架到盆地的三个类似样带进行了诊断色素和环境参数分析。结果表明，ACW的入侵降低了陆架区的叶绿素(Chla)浓度，但有利于流域浮游植物的生长，特别是小型绿藻和金藻的生长。一个可能的解释是营养状况的变化，因为在向北流动的过程中，ACW 会散发热量并从周围的冷水中吸收营养。 Prasino 和 Chlb（水生植物的诊断色素）的浓度从 2008 年几乎检测不到增加到 2014 年和 2016 年分别高于 15 ng/dm3（Prasino）和 65 ng/dm3（Chlb），这与 ACW 的存在和地下硝酸盐储层的增加同时发生。这些发现表明，ACW的入侵将营养物质带入地下盆地层，这可能有利于北冰洋西部小型浮游植物的生长。
The inflow of Alaska Coastal Water (ACW) acts as a source of heat and freshwater for the Arctic Ocean, and contributes to ecosystem succession as well as phytoplankton change. To explore the mechanisms and patterns of the phytoplankton composition in response to the ACW, diagnostic pigments and environmental parameters were analyzed along three similar transects from shelf to basin in the Arctic Ocean during summer in 2008–2016. The results showed that the incursion of the ACW reduced the chlorophylla(Chla) concentration in the shelf areas, but favored phytoplankton growth in basin areas, especially that of small prasinophytes and chrysophytes. A possible explanation is the change in nutrient status, because during its northward flow, the ACW dissipates heat and receives nutrients from the surrounding cold water. The concentrations of Prasino and Chlb(the diagnostic pigments of prasinophytes) increase from barely detected in 2008 to higher than 15 ng/dm3(Prasino) and 65 ng/dm3(Chlb) respectively in 2014 and 2016, which occurred synchronously with presence of ACW and an increase in subsurface nitrate reservoirs. These findings indicate that the incursion of the ACW brings nutrients into subsurface basin layers, which could favor the growth of small phytoplankton in the western Arctic Ocean.