期刊
INLAND WATERS
卷 12, 期 3, 页码 418-426出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/20442041.2022.2063623
关键词
Arctic; lake; oxygen; silica; under-ice; winter limnology
资金
- Arctic Institute
- Defense Research Board of Canada
- National Research Council of Canada
- Royal Society
- United States Steel Foundation
- Hudson's Bay Company
- Office of Naval Research (USA)
- Massey-Ferguson Ltd.
- United States Weather Bureau
- Meteorological Branch of the Department of Transportation (Canada)
- Quartermaster Corps of the United States Army
- National Science Foundation (USA) [1754358]
- Division Of Environmental Biology
- Direct For Biological Sciences [1754358] Funding Source: National Science Foundation
Arctic lakes are experiencing decreased ice cover duration and thickness, which has implications for lake ecosystems. However, our understanding of the geochemical dynamics of nutrients and oxygen beneath ice cover in high Arctic lakes is limited. This study presents data from Immerk Lake on Devon Island, Canada, showing the importance of the extended winter season for the regeneration of silicate, a key nutrient for diatom populations in Arctic lakes.
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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