Seasonal data for 2 lakes in Kangerlussuaq, Greenland (April 2019-July 2019)

The purpose of this data is to understand how does seasonal dynamics of these periglacial lakes vary between 2 climatic regions from under-ice to open-water periods leveraging high-frequency monitoring and discreet manual sampling of lakewater for analyses of chemistry and biology. This dataset includes water quality measurements (nutrient concentrations, dissolved organic carbon), phytoplankton cell density and biovolume, pigment concentrations, and high-frequency measurements of dissolved oxygen (DO) and photosynthetically active radiation (PAR) collected approx. weekly from two lakes around Kangerlussuaq, Greenland (Lake SS2, Lake SS901) between April and July 2019. These two lakes were selected because they are representative of a suite of lakes located along hydro-climatic gradient in West Greenland (e.g., data from Fowler and Saros, 2019; DOI:10.18739/A2QB9V561). The primary objective of our study was to understand seasonal dynamics of phytoplankton biomass and community structure during the succession from ice-covered to open-water conditions in two oligotrophic, Arctic lakes with different dissolved organic carbon (DOC) concentrations that are representative of a suite of lakes in West Greenland. Specifically, we assessed which factors promote under-ice growth of phytoplankton and trigger shifts in the community structure over time and along vertical gradients within the water column.

本数据集旨在通过高频监测与审慎的湖水手动采样开展化学与生物学分析，探究格陵兰两个气候分区内的冰缘湖（periglacial lake）从冰封期至无冰期的季节动态差异。本数据集涵盖2019年4月至7月期间，在格陵兰康克鲁斯瓦格（Kangerlussuaq）周边两座湖泊（SS2湖、SS901湖）每周左右采集的多项数据：水质测量指标（营养盐浓度、溶解性有机碳（dissolved organic carbon, DOC））、浮游植物细胞密度与生物体积、色素浓度，以及溶解氧（dissolved oxygen, DO）与光合有效辐射（photosynthetically active radiation, PAR）的高频监测数据。选取这两座湖泊的原因在于，它们能够代表西格陵兰沿水文气候梯度分布的一类湖泊（参考Fowler与Saros，2019；DOI:10.18739/A2QB9V561）。本研究的核心目标为，在两座能代表西格陵兰地区湖泊类群、且溶解性有机碳浓度存在差异的寡营养北极湖泊中，解析从冰封期到无冰期的生态演替过程中，浮游植物生物量与群落结构的季节动态变化。具体而言，本研究旨在明确哪些因素能够促进浮游植物的冰下生长，并驱动其群落结构随时间与水体垂直梯度发生变化。