气候变化领域集成服务门户(CCPortal): Nutrient Distribution in East Antarctic Summer Sea Ice: A Potential Iron Contribution From Glacial Basal Melt

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DOI	10.1029/2020JC016130
	Nutrient Distribution in East Antarctic Summer Sea Ice: A Potential Iron Contribution From Glacial Basal Melt
	Duprat L.; Corkill M.; Genovese C.; Townsend A.T.; Moreau S.; Meiners K.M.; Lannuzel D.
发表日期	2020
ISSN	21699275
卷号	125 期号:12
英文摘要	Antarctic sea ice can incorporate high levels of iron (Fe) during its formation and has been suggested as an important source of this essential micronutrient to Southern Ocean surface waters during the melt season. Over the last decade, a limited number of studies have quantified the Fe pool in Antarctic sea ice, with a focus on late winter and spring. Here we study the distribution of operationally defined dissolved and particulate Fe from nine sites sampled between Wilkes Land and King George V Land during austral summer 2016/2017. Results point toward a net heterotrophic sea-ice community, consistent with the observed nitrate limitation (<1 μM). We postulate that the recycling of the high particulate Fe pool in summer sea ice supplies sufficient (∼3 nM) levels of dissolved Fe to sustain ice algal growth. The remineralization of particulate Fe is likely favored by high concentrations of exopolysaccharides (113–16,290 μg xeq L−1) which can serve as a hotspot for bacterial activity. Finally, results indicate a potential relationship between glacial meltwater discharged from the Moscow University Ice Shelf and the occurrence of Fe-rich (∼4.3 μM) platelet ice in its vicinity. As climate change is expected to result in enhanced Fe-rich glacial discharge and changes in summer sea-ice extent and quality, the processes influencing Fe distribution in sea ice that persists into summer need to be better constrained. © 2020. The Authors.
英文关键词	East Antarctica; iron; platelet ice; sea ice; summer
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186577
作者单位	Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Central Science Laboratory, University of Tasmania, Hobart, TAS, Australia; Norwegian Polar Institute, Tromsø, Norway; Department of Agriculture, Water and the Environment, Australian Antarctic Division, Kingston, TAS, Australia; Australian Antarctic Program Partnership, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia
推荐引用方式 GB/T 7714	Duprat L.,Corkill M.,Genovese C.,et al. Nutrient Distribution in East Antarctic Summer Sea Ice: A Potential Iron Contribution From Glacial Basal Melt[J],2020,125(12).
APA	Duprat L..,Corkill M..,Genovese C..,Townsend A.T..,Moreau S..,...&Lannuzel D..(2020).Nutrient Distribution in East Antarctic Summer Sea Ice: A Potential Iron Contribution From Glacial Basal Melt.Journal of Geophysical Research: Oceans,125(12).
MLA	Duprat L.,et al."Nutrient Distribution in East Antarctic Summer Sea Ice: A Potential Iron Contribution From Glacial Basal Melt".Journal of Geophysical Research: Oceans 125.12(2020).