NDLI: The Scotia Sea and the Drake Passage as an orographic barrier for the Antarctic Circumpolar Current

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The Scotia Sea and the Drake Passage as an orographic barrier for the Antarctic Circumpolar Current

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The Scotia Sea and the Drake Passage as an orographic barrier for the Antarctic Circumpolar Current

Content Provider	Springer Nature Link
Author	Tarakav, R. Yu.
Copyright Year	2012
Abstract	It is shown on the basis of the data of the Russian Academy of Sciences expeditions in 2003–2010, the historical CTD database, the WOCE climatology, and the satellite altimetry that the area of the Scotia Sea and the Drake Passage is even a greater significant orographic barrier for the eastward Antarctic Circumpolar Current (ACC) than was previously thought. It is the current concept that this barrier is the most important for the ACC; it consists of three obstacles: the Hero Ridge with the Phoenix Rift, the Shackleton Ridge, and the North Scotia Ridge with the relatively shallow eastern part of the Scotia Sea. Despite the fact that all three obstacles are permeable for the layer of the Circumpolar Bottom Water (CBW; 28.16 < γ$^{ n }$ < 28.26) being considered the lower part of the circumpolar water, the circulation in this layer throughout the Scotia Sea and the Drake Passage quite substantially differs from the transfer by the surface-intensified ACC jets. Herewith, the upper CBW boundary is the lower limit of the circumpolar coverage of the ACC jets. This result is confirmed by the near zero estimate of the total CBW transport according to the three series of the LADCP measurements on the sections across the Drake Passage. It is shown that the transformation (cooling and freshening) of the CBW layer, which occurs owing to the flow of the ACC over the Shackleton Ridge, is associated with the shape and location of the ridge in the Drake Passage. The high southern part of this ridge is a partially permeable screen for the eastward CBW transport behind which the colder and fresher waters of the Weddell Sea and the Bransfield Strait of the same density range as the CBW penetrate into the ACC zone. The partial permeability of the Shackleton Ridge for the CBW layer leads to the salinization of this layer on the eastern side of the ridge and to the CBW’s freshening on the western side of this ridge, which is observed across the entire Drake Passage.
Starting Page	157
Ending Page	170
Page Count	14
File Format	PDF
ISSN	00014370
Journal	Oceanology
Volume Number	52
Issue Number	2
e-ISSN	15318508
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-04-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

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Circumpolar bottom water in the Scotia Sea and the Drake Passage

Antarctic bottom water in the Scotia Sea and the Drake Passage

Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage

Coupled climate impacts of the Drake Passage and the Panama Seaway

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