Overwinter oxygen and silicate dynamics in a high Arctic lake (Immerk Lake, Devon Island, Canada)

Overwinter oxygen and silicate dynamics in a high Arctic lake (Immerk Lake, Devon Island, Canada)
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北极高海拔湖泊(加拿大德文岛伊默克湖)的越冬氧气和硅酸盐动态

DOI:
10.1080/20442041.2022.2063623
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发表时间:
2022
期刊:
影响因子:
3.1
通讯作者:
Apollonio, Spencer
Apollonio, Spencer
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Michaud, Alexander B.;Apollonio, Spencer

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北极湖泊一年中有8-12个月被冰覆盖,但随着变暖的加剧,冰盖的持续时间和厚度正在减少。缺乏记录北极高地湖泊冰盖下营养物质和氧气的地球化学动态的基线数据,这一空白对试图了解快速变化的北极对湖泊生态系统的影响构成了挑战。我们提供了来自加拿大德文岛特鲁洛夫低地的Immerk湖的温度、氧气和硅酸盐的年度周期数据。在冰盖季节,水柱中的氧浓度下降,而硅酸盐浓度上升。春夏期间冰盖融化与硅酸盐现存量的迅速净减少有关,其下降速度几乎是冬季净增加速度的3倍。这些数据显示了冬季延长对硅酸盐再生的重要性,硅酸盐是硅藻种群的基本营养物质,是北极湖泊浮游植物群落和碳循环的重要成员。这些60年前收集的数据作为基准,记录了北极湖在冰形成、冬季黑暗和冰盖融化期间的水柱氧和硅酸盐动态。
Arctic lakes are ice covered for 8–12 months of the year, but the duration and thickness of ice cover is decreasing with increased warming. There is a paucity of baseline data documenting the geochemical dynamics of nutrients and oxygen beneath ice cover of high Arctic lakes, a gap that presents a challenge when attempting to understand the impacts of a rapidly changing Arctic on lake ecosystems. We present an annual cycle of temperature, oxygen, and silicate data from Immerk Lake on Truelove Lowland, Devon Island, Canada. Water column oxygen concentrations decreased while silicate concentrations increased during the ice-covered season. Ice cover melting during spring–summer is associated with rapid net decreases of the silicate standing stock at almost 3 times the rate of its net increase over winter. These data show the importance of the extended winter season for regeneration of silicate, an essential nutrient for diatom populations, which are important members of the phytoplankton community and carbon cycle of Arctic lakes. These data collected 60 years ago serve as a benchmark and document the water column oxygen and silicate dynamics in an Arctic lake during ice formation, winter darkness, and ice-cover melting periods.
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