气候变化领域集成服务门户(CCPortal): Winter Dust Storms Impact the Physical and Biogeochemical Functioning of a Large High Arctic Lake

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DOI	10.1021/acs.est.4c00705
	Winter Dust Storms Impact the Physical and Biogeochemical Functioning of a Large High Arctic Lake
	St.Louis, Vincent L.; St.Pierre, Kyra A.; Emmerton, Craig A.; Serbu, Jessica A.; Talbot, Charles H.; Szostek, Lisa; Lehnherr, Igor; Muir, Derek C. G.; Criscitiello, Alison
发表日期	2024
ISSN	0013-936X
EISSN	1520-5851
英文摘要	We found that a winter of abnormally low snowfall and numerous dust storms from eolian processes acting on exposed landscapes (including a major 4-day dust storm while onsite in May 2014) caused a cascade of impacts on the physical, chemical, and ecological functioning of the largest lake by volume in the High Arctic (Lake Hazen; Nunavut, Canada). MODIS imagery revealed that dust deposited in snowpacks on the lake's ice acted as light-absorbing impurities (LAIs), reducing surface reflectance and increasing surface temperatures relative to normal snowpack years, causing early snowmelt and drainage of meltwaters into the lake. LAIs remaining on the ice surface melted into the ice, causing premature candling and one of the earliest ice-offs and longest ice-free seasons on record for Lake Hazen. Meltwater inputs from snowpacks resulted in dilution of dissolved, and increased concentration of particulate bound, chemical species in Lake Hazen's upper water column. Spring inputs of nutrients increased both heterotrophy and algal productivity under the surface ice following snowmelt, with a net consumption of dissolved oxygen. As climate change continues to alter High Arctic temperatures and precipitation patterns, we can expect further changes in dust storm frequency and severity with corresponding impacts for freshwater ecosystems.
英文关键词	High Arctic; dust storms; light absorbing impurities; surface reflectivity; snowpacks; lake ice; limnology; heterotrophy; primary production; ice-free season
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology
WOS类目	Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:001200603200001
来源期刊	ENVIRONMENTAL SCIENCE & TECHNOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/296713
作者单位	University of Alberta; University of Ottawa; Environment & Climate Change Canada; Canada Centre for Inland Waters (CCIW); University of Toronto; University Toronto Mississauga; University of Alberta
推荐引用方式 GB/T 7714	St.Louis, Vincent L.,St.Pierre, Kyra A.,Emmerton, Craig A.,et al. Winter Dust Storms Impact the Physical and Biogeochemical Functioning of a Large High Arctic Lake[J],2024.
APA	St.Louis, Vincent L..,St.Pierre, Kyra A..,Emmerton, Craig A..,Serbu, Jessica A..,Talbot, Charles H..,...&Criscitiello, Alison.(2024).Winter Dust Storms Impact the Physical and Biogeochemical Functioning of a Large High Arctic Lake.ENVIRONMENTAL SCIENCE & TECHNOLOGY.
MLA	St.Louis, Vincent L.,et al."Winter Dust Storms Impact the Physical and Biogeochemical Functioning of a Large High Arctic Lake".ENVIRONMENTAL SCIENCE & TECHNOLOGY (2024).