气候变化领域集成服务门户(CCPortal): Glacial and Hydrothermal Sources of Dissolved Iron (II) in Southern Ocean Waters Surrounding Heard and McDonald Islands

CCPortal

DOI	10.1029/2020JC016286
	Glacial and Hydrothermal Sources of Dissolved Iron (II) in Southern Ocean Waters Surrounding Heard and McDonald Islands
	Holmes T.M.; Wuttig K.; Chase Z.; Schallenberg C.; van der Merwe P.; Townsend A.T.; Bowie A.R.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	The Southern Ocean is the largest region in which iron limits the growth of phytoplankton. However, a phytoplankton bloom thousands of square kilometers in area forms each spring–summer in the Indian sector of the Southern Ocean, both above and to the east of the Kerguelen Plateau. The central region of the Kerguelen Plateau hosts the volcanically active islands, Heard and McDonald (HIMI), the former of which is largely covered by glaciers. The sources and processes governing supply of iron from HIMI to the region are relatively unknown. In the austral summer of 2016, the first voyage to focus on biogeochemical cycling in the HIMI region was undertaken (GEOTRACES process study GIpr05). Using dissolved iron (II) (DFe (II)) and hydrogen peroxide (H2O2) measurements, we are able to resolve iron sources and show that each of the adjacent islands are strong sources of reduced iron, though controlled by different supply mechanisms. At Heard Island, the greatest DFe (II) concentrations (0.57 nmol L−1) were detected north of the island. An inverse correlation of DFe (II) concentrations with salinity suggests the origin is from a sea-terminating glacier on the island. At McDonald Islands, the greatest DFe (II) concentrations (1.01 nmol L−1) were detected east of the islands, which, based on DFe (II) profiles from five targeted stations, appear likely to originate from shallow diffuse hydrothermalism. Elevated DFe (II) around HIMI may increase Fe availability for biota and has implications for transport of Fe away from the islands to the broader northern Kerguelen Plateau where the annual plankton bloom is strongest. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	biogeochemistry; GEOTRACES; iron; Kerguelen Plateau; Southern Ocean; trace metal
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/186653
作者单位	Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC), University of Tasmania, Hobart, TAS, Australia; Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Hobart, TAS, Australia; Now at School of Oceanography, University of Washington, Seattle, WA, United States; Central Science Laboratory (CSL), University of Tasmania, Hobart, TAS, Australia
推荐引用方式 GB/T 7714	Holmes T.M.,Wuttig K.,Chase Z.,et al. Glacial and Hydrothermal Sources of Dissolved Iron (II) in Southern Ocean Waters Surrounding Heard and McDonald Islands[J],2020,125(10).
APA	Holmes T.M..,Wuttig K..,Chase Z..,Schallenberg C..,van der Merwe P..,...&Bowie A.R..(2020).Glacial and Hydrothermal Sources of Dissolved Iron (II) in Southern Ocean Waters Surrounding Heard and McDonald Islands.Journal of Geophysical Research: Oceans,125(10).
MLA	Holmes T.M.,et al."Glacial and Hydrothermal Sources of Dissolved Iron (II) in Southern Ocean Waters Surrounding Heard and McDonald Islands".Journal of Geophysical Research: Oceans 125.10(2020).