Abstract

Unique data were obtained on the abnormally high level of phytoplankton biomass (30 g m^–3) in the marginal ice zone of the deep-water High Arctic (the Nansen Basin, 83° N) during observations onboard a ship in the summer of 2020. The changes in species composition and the increase in abundance of plankton phytocenoses were determined by the complex hydrographic structure formed due to the interaction between the warm Atlantic and cold Arctic water masses and confirmed the important role of the North Atlantic Current in the European sector of the Arctic Basin. For the first time, a reliable relationship was established between the phytoplankton productivity and the halocline depth (an indicator of rising Atlantic water enriched with nutrients, primarily nitrogen). It was shown for the first time that the large cryopelagic centric diatom Porosira glacialis (= Podosira hormoides var. glacialis) can be a species forming phytoplankton bloom in the marginal ice zone of the High Arctic.

中文翻译：

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可变大西洋入水量影响下的南森盆地远洋生态系统：边缘冰区硅藻华的形成机制

摘要

获得了异常高水平的浮游植物生物量 (30 gm ^–3) 于 2020 年夏季在船上观测期间在深水高北极（南森盆地，北纬 83°）的边缘冰区。物种组成的变化和浮游植物群落丰度的增加由由于温暖的大西洋和寒冷的北极水团之间的相互作用形成了复杂的水文结构，并证实了北大西洋海流在北极盆地欧洲部分的重要作用。首次在浮游植物生产力和盐层深度（富含营养物质（主要是氮）的大西洋海水上升的指标）之间建立了可靠的关系。首次表明大型冰层中心硅藻Porosira glacialis (= Podosira hormoides var.glacialis)可能是在北极边缘冰区形成浮游植物大量繁殖的物种。