Geochemistry of Lake Tinninilik, Greenland, July 2022

Lake Tinninilik is an ice-marginal lake in western Greenland. It is dammed by Sarqardliup Glacier to the East and North, and drains on a quasi-decadal timescale when lake volume reaches a critical threshold. When Lake Tininnilik does drain, it discharges ~2 cubic kilometers (km3) of lake water in Sarqardleq Fjord to the North. Samples were collected in July 2022 from streams around the lake and surface and depth water samples from the lake itself. The lake samples were collected using a niskin onboard an inflatable dinghy. Trace metal (ICP-MS), ion (ion chromatography), and nutrient (colorimetric nutrient analysis) geochemical data were generated from the Lake Tinninilik samples to understand whether the Greenland ice-marginal lakes are an important source of nutrients to coastal waters into which they drain.

提宁尼利克湖（Lake Tinninilik）是格陵兰西部的冰缘湖（ice-marginal lake），其东侧与北侧被萨卡德利普冰川（Sarqardliup Glacier）堰塞。当湖体容积达到临界阈值时，该湖会以准十年为时间尺度发生排水事件。当提宁尼利克湖排水时，会向北侧的萨卡德列克峡湾（Sarqardleq Fjord）排放约2立方千米的湖水。研究团队于2022年7月采集了该湖周边溪流的水样，以及湖泊自身的表层与深层水样；其中湖泊水样通过充气小艇搭载的尼斯金采水器（niskin）采集。研究人员从上述提宁尼利克湖的水样中获取了痕量金属（电感耦合等离子体质谱法，ICP-MS）、离子（离子色谱法）以及营养盐（比色营养盐分析）相关的地球化学数据，旨在探究格陵兰冰缘湖是否为其注入的近岸海域提供了重要的营养盐来源。