Abstract

The vertical distribution of phytoplankton primary production (PP) and chlorophyll a (Chl) was studied based on the data carried out in August–September 2015, 2017, and 2018. The PP maximum was located at the surface or within the 0–5 m subsurface layer. The subsurface chlorophyll maximum (SCM) was recorded at 39% stations on the outer shelf and in the vicinity of the continental slope. The SCM was not detected along the northward transect (130° E) from the Lena River delta. As in other areas of the World Ocean, the SCM was located below the upper mixed layer (UML), in the nitracline, near the boundary of the euphotic zone (1% of photosynthetically active radiation). Generally, the SCM was not accompanied by an additional PP maximum. The Chl concentration at the SCM did not exceed 1 mg m^–3. PP produced within the UML and SCM contributed 72 and 23%, respectively, to the integrated primary production (IPP) of the water column. Our results suggest that the influence of the SCM on IPP was insufficient due to low Chl concentration and PP colimitation by the low light and temperature at these depths.

中文翻译：

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2015年8月至9月，2017年和2018年拉普捷夫海初级生产的垂直变化和地下叶绿素最大值的特征

摘要

根据2015年8月至9月，2017年和2018年进行的数据研究了浮游植物初级生产力（PP）和叶绿素a（Chl）的垂直分布。PP最大值位于表层或0-5 m以内地下层。在外陆架和大陆斜坡附近的39％站记录了地下叶绿素最大值（SCM）。在利纳河三角洲的北向断面（东经130°）未检测到SCM。与世界海洋的其他地区一样，SCM位于硝化碱中的上混合层（UML）下方，靠近常光区的边界（光合有效辐射的1％）。通常，SCM没有附加的最大PP值。SCM处的Chl浓度不超过1 mg m ^–3。在UML和SCM中生产的PP分别占水塔综合初级生产（IPP）的72％和23％。我们的结果表明，SCM对IPP的影响不足，原因是在这些深度处低的Chl浓度和低的光照和温度限制了PP共限。