气候变化领域集成服务门户(CCPortal): Along-Stream, Seasonal, and Interannual Variability of the North Icelandic Irminger Current and East Icelandic Current Around Iceland

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DOI	10.1029/2020JC016283
	Along-Stream, Seasonal, and Interannual Variability of the North Icelandic Irminger Current and East Icelandic Current Around Iceland
	Casanova-Masjoan M.; Pérez-Hernández M.D.; Pickart R.S.; Valdimarsson H.; Ólafsdóttir S.R.; Macrander A.; Grisolía-Santos D.; Torres D.J.; Jónsson S.; Våge K.; Lin P.; Hernández-Guerra A.
发表日期	2020
ISSN	21699275
卷号	125 期号:9
英文摘要	Data from repeat hydrographic surveys over the 25-year period 1993 to 2017, together with satellite altimetry data, are used to quantify the temporal and spatial variability of the North Icelandic Irminger Current (NIIC), East Icelandic Current (EIC), and the water masses they advect around northern Iceland. We focus on the warm, salty Atlantic Water (AW) flowing northward through Denmark Strait and the cooler, fresher, denser Atlantic-origin Overflow Water (AtOW) which has circulated cyclonically around the rim of the Nordic Seas before being advected to the Iceland slope via the EIC. The absolute geostrophic velocities reveal that approximately half of the NIIC recirculates just north of Denmark Strait, while the remaining half merges with the EIC to form a single current that extends to the northeast of Iceland, with no further loss in transport of either component. The AW percentage decreases by 75% over this distance, while the AtOW percentage is higher than that of the AW in the merged current. The NIIC and merged NIIC-EIC are found to be baroclinically unstable, which causes the flow to become increasingly barotropic as it progresses around Iceland. A seasonal accounting of the water masses within the currents indicates that only in springtime is the NIIC dominated by AW inflow north of Denmark Strait. Overall, there is considerably more seasonal and along-stream variability in the properties of the flow prior to the merging of the NIIC and EIC. Over the 25-year time period, the NIIC became warmer, saltier, and increased in volume transport. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atlantic Water inflow; East Icelandic Current; North Icelandic Irminger Current
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/186677
作者单位	Unidad océano y clima, Instituto de Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria, ULPGC, Unidad Asociada ULPGC-CSIC, Las Palmas de Gran Canaria, Spain; Marine and Freshwater Research Institute, Hafnarfjörður, Iceland; Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; School of Business and Science, University of Akureyri, Akureyri, Iceland; Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway
推荐引用方式 GB/T 7714	Casanova-Masjoan M.,Pérez-Hernández M.D.,Pickart R.S.,et al. Along-Stream, Seasonal, and Interannual Variability of the North Icelandic Irminger Current and East Icelandic Current Around Iceland[J],2020,125(9).
APA	Casanova-Masjoan M..,Pérez-Hernández M.D..,Pickart R.S..,Valdimarsson H..,Ólafsdóttir S.R..,...&Hernández-Guerra A..(2020).Along-Stream, Seasonal, and Interannual Variability of the North Icelandic Irminger Current and East Icelandic Current Around Iceland.Journal of Geophysical Research: Oceans,125(9).
MLA	Casanova-Masjoan M.,et al."Along-Stream, Seasonal, and Interannual Variability of the North Icelandic Irminger Current and East Icelandic Current Around Iceland".Journal of Geophysical Research: Oceans 125.9(2020).