globalchange  > 气候减缓与适应
DOI: 10.1029/2018JC013932
Scopus记录号: 2-s2.0-85052830677
论文题名:
Sustained Upwelling of Subsurface Iron Supplies Seasonally Persistent Phytoplankton Blooms Around the Southern Kerguelen Plateau, Southern Ocean
作者: Schallenberg C.; Bestley S.; Klocker A.; Trull T.W.; Davies D.M.; Gault-Ringold M.; Eriksen R.; Roden N.P.; Sander S.G.; Sumner M.; Townsend A.T.; van der Merwe P.; Westwood K.; Wuttig K.; Bowie A.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:8
起始页码: 5986
结束页码: 6003
语种: 英语
英文关键词: Banzare bank ; dissolved iron ; GEOTRACES ; high-nutrient low-chlorophyll (HNLC) ; Kerguelen plateau ; phytoplankton
英文摘要: Although the supply of iron generally limits phytoplankton productivity in the Southern Ocean, substantial seasonal blooms are observed over and downstream of the Kerguelen plateau in the Indian sector of the Southern Ocean. Surprisingly, of the oceanic blooms, those associated with the deeper southern plateau last much longer (~3 months) than the northern bloom (~1-month downstream of northern plateau). In this study, iron supply mechanisms around the southern plateau were investigated, obtaining profiles of dissolved iron (<0.2 μm, dFe) to 2,000-m deep at 25 stations during austral summer 2016. The dFe concentrations in surface waters (≤100-m depth) ranged from below the detection limit (DL, median of 0.026 nmol/kg) to 0.34 nmol/kg near the Antarctic shelf, with almost half the data points below detection. These low and—with few exceptions—largely spatially invariant concentrations, presumably driven by seasonal drawdown of this essential micronutrient by phytoplankton, could not explain observed patterns in chlorophyll a. In contrast, dFe concentrations (0.05–1.27 nmol/kg) in subsurface waters (100–800 m) showed strong spatial variations that can explain bloom patterns around the southern Kerguelen plateau when considered in the context of frontal locations and associated frontal processes, including upwelling, that may increase the upward supply of dFe in the region. This sustained vertical dFe supply distinguishes the southern blooms from the bloom downstream of the northern Kerguelen plateau and explains their persistence through the season. ©2018. American Geophysical Union. All Rights Reserved.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113448
Appears in Collections:气候减缓与适应

Files in This Item:

There are no files associated with this item.


作者单位: Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, TAS, Australia; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; CSIRO Oceans and Atmosphere, Castray Esplanade, Hobart, TAS, Australia; Australian Research Council Centre of Excellence for Climate System Science, University of Tasmania, Hobart, TAS, Australia; NIWA/University of Otago Research Centre Oceanography, University of Otago, Dunedin, New Zealand; Now at Marine Environmental Studies Laboratory, IAEA-NAEL, Monaco, Monaco; Australian Antarctic Division, Department of the Environment and Energy, Kingston, TAS, Australia; Central Science Laboratory, University of Tasmania, Hobart, TAS, Australia

Recommended Citation:
Schallenberg C.,Bestley S.,Klocker A.,et al. Sustained Upwelling of Subsurface Iron Supplies Seasonally Persistent Phytoplankton Blooms Around the Southern Kerguelen Plateau, Southern Ocean[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(8)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Schallenberg C.]'s Articles
[Bestley S.]'s Articles
[Klocker A.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Schallenberg C.]'s Articles
[Bestley S.]'s Articles
[Klocker A.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Schallenberg C.]‘s Articles
[Bestley S.]‘s Articles
[Klocker A.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.