Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL079614 |
Seasonal Meandering of the Polar Front Upstream of the Kerguelen Plateau | |
Pauthenet, E.1; Roquet, F.1,2; Madec, G.3; Guinet, C.4; Hindell, M.5,6; McMahon, C. R.5,7,8; Harcourt, R.8; Nerini, D.9 | |
2018-09-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:18页码:9774-9781 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; France; Australia |
英文摘要 | The location of the Antarctic Polar Front (PF) is mapped in the Southern Indian Ocean by decomposing the shape of temperature and salinity profiles into vertical modes using a functional Principal Component Analysis. We define the PF as the northernmost minimum of temperature at the subsurface and represent it as a linear combination of the first three modes. This method is applied on an ocean reanalysis data set and on in situ observations, revealing a seasonal variability of the PF latitudinal position that is most pronounced between the Conrad Rise and the Kerguelen Plateau. This shift coincides with variations in the transport across the Northern Kerguelen Plateau. We suggest that seasonal changes of the upper stratification may drive the observed variability of the PF, with potentially large implications for the pathways and residence time of water masses over the plateau and the phytoplankton bloom extending southeast of the Kerguelen Islands. Plain Language Summary The Antarctic Polar Front (PF) is a water mass boundary that flows around Antarctica between approximately 48 degrees S and 56 degrees S in the Southern Indian Ocean. The position of the PF in space and time is important to understand the oceanic circulation, the heat and salt exchanges, and also marine ecosystems. In the Indian sector the PF has to cross the Kerguelen Plateau, a major bottom topography feature. The present study develops and then applies a novel method for mapping the PF taking into account the whole hydrographic structure in the upper 300 m of the ocean. We are able to map the PF position and find that it presents large seasonal variations that are more intense just west of the Kerguelen Plateau. Between the Conrad Rise and the Kerguelen Plateau, the PF is essentially zonally orientated in September and found farther south by up to 4 degrees latitude in March. Shifts in the PF position are shown to correlate with a seasonal variation in volume transport between Kerguelen and Heard Islands. We discuss how these seasonal variations in circulation pathways could have an impact on the local marine ecosystems. |
英文关键词 | Antarctic Polar Front Kerguelen Plateau Southern Indian Ocean Southern Ocean fronts functional principal component analysis |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000447761300049 |
WOS关键词 | SOUTHERN ; VARIABILITY ; CIRCULATION ; ISLANDS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26744 |
专题 | 气候变化 |
作者单位 | 1.Stockholm Univ, Dept Meteorol MISU, Stockholm, Sweden; 2.Univ Gothenburg, Dept Marine Sci, Gothenburg, Sweden; 3.Univ Paris 06, UPMC, LOCEAN Sorbonne Univ, CNRS,IRD,MNHN, Paris, France; 4.CNRS, Ctr Etud Biol Chize, Paris, France; 5.Univ Tasmania, Inst Marine & Antarctic Studies, Hobart, Tas, Australia; 6.Univ Tasmania, Antarctic Cimate & Ecosyst Cooperat Res Ctr, Hobart, Tas, Australia; 7.Sydney Inst Marine Sci, Mosman, NSW, Australia; 8.Macquarie Univ, Dept Biol Sci, Sydney, NSW, Australia; 9.Univ Toulon & Var, Aix Marseille Univ, Mediterranean Inst Oceanog, CNRS,INSU,IRD,UM110, Marseille, France |
推荐引用方式 GB/T 7714 | Pauthenet, E.,Roquet, F.,Madec, G.,et al. Seasonal Meandering of the Polar Front Upstream of the Kerguelen Plateau[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(18):9774-9781. |
APA | Pauthenet, E..,Roquet, F..,Madec, G..,Guinet, C..,Hindell, M..,...&Nerini, D..(2018).Seasonal Meandering of the Polar Front Upstream of the Kerguelen Plateau.GEOPHYSICAL RESEARCH LETTERS,45(18),9774-9781. |
MLA | Pauthenet, E.,et al."Seasonal Meandering of the Polar Front Upstream of the Kerguelen Plateau".GEOPHYSICAL RESEARCH LETTERS 45.18(2018):9774-9781. |
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