气候变化领域集成服务门户(CCPortal): Analysis of Iron Sources in Antarctic Continental Shelf Waters

CCPortal

DOI	10.1029/2019JC015736
	Analysis of Iron Sources in Antarctic Continental Shelf Waters
	Dinniman M.S.; St-Laurent P.; Arrigo K.R.; Hofmann E.E.; van Dijken G.L.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	Previous studies showed that satellite-derived estimates of chlorophyll a in coastal polynyas over the Antarctic continental shelf are correlated with the basal melt rate of adjacent ice shelves. A 5-km resolution ocean/sea ice/ice shelf model of the Southern Ocean is used to examine mechanisms that supply the limiting micronutrient iron to Antarctic continental shelf surface waters. Four sources of dissolved iron are simulated with independent tracers, assumptions about the source iron concentration for each tracer, and an idealized summer biological uptake. Iron from ice shelf melt provides about 6% of the total dissolved iron in surface waters. The contribution from deep sources of iron on the shelf (sediments and Circumpolar Deep Water) is much larger at 71%. The relative contribution of dissolved iron supply from basal melt driven overturning circulation within ice shelf cavities is heterogeneous around Antarctica, but at some locations, such as the Amundsen Sea, it is the primary mechanism for transporting deep dissolved iron to the surface. Correlations between satellite chlorophyll a in coastal polynyas around Antarctica and simulated dissolved iron confirm the previous suggestion that productivity of the polynyas is linked to the basal melt of adjacent ice shelves. This correlation is the result of upward advection or mixing of iron-rich deep waters due to circulation changes driven by ice shelf melt, rather than a direct influence of iron released from melting ice shelves. This dependence highlights the potential vulnerability of coastal Antarctic ecosystems to changes in ice shelf basal melt rates. ©2020. American Geophysical Union. All Rights Reserved.
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/186868
作者单位	Center for Coastal Physical Oceanography, Old Dominion University, Norfolk, VA, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States
推荐引用方式 GB/T 7714	Dinniman M.S.,St-Laurent P.,Arrigo K.R.,et al. Analysis of Iron Sources in Antarctic Continental Shelf Waters[J],2020,125(5).
APA	Dinniman M.S.,St-Laurent P.,Arrigo K.R.,Hofmann E.E.,&van Dijken G.L..(2020).Analysis of Iron Sources in Antarctic Continental Shelf Waters.Journal of Geophysical Research: Oceans,125(5).
MLA	Dinniman M.S.,et al."Analysis of Iron Sources in Antarctic Continental Shelf Waters".Journal of Geophysical Research: Oceans 125.5(2020).