Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene

1964 ◽

Vol 281 (1384) ◽

pp. 14-21 ◽

Cited By ~ 1

Keyword(s):

Antarctic Circumpolar Current ◽

Zonal Flow ◽

The Other ◽

Convergence Zone ◽

Circumpolar Current ◽

The Antarctic

This review of work on the circumpolar current and Convergence will indicate that a number of hypotheses have been advanced, each claiming to have some support from the observations and each differing considerably in their premises. Thus on one side departures from purely zonal flow along lines of latitude are all important, on the other such departures are irrelevant. It will be seen that none of the hypotheses suggest the formation of the marked Convergence zone that has been described by Deacon and in that respect they fail, for the dynamics of the flow should contain a description of the Convergence. It is worth while to describe these hypotheses briefly and see in what respects they are successful and where they fail.

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Neogene Pectinidae (Bivalvia) of tribe Chlamydini Teppner, 1922 in Patagonia (Argentina):ZygochlamysIhering, 1907 and three new genera

Journal of Paleontology ◽

10.1017/jpa.2018.75 ◽

2018 ◽

Vol 93 (2) ◽

pp. 312-336 ◽

Cited By ~ 1

Author(s):

María B. Santelli ◽

Claudia J. del Río

Keyword(s):

Late Miocene ◽

Type Species ◽

Antarctic Circumpolar Current ◽

Middle Miocene ◽

New Genus ◽

Early Miocene ◽

New Genera ◽

Early Pliocene ◽

Circumpolar Current ◽

The Antarctic

AbstractZygochlamysIhering, 1907 is revised and three new genera of tribe Chlamydini are named: the monospecific early Miocene generaPixiechlamysnew genus (type species:Pecten quemadensisIhering, 1897) andChokekenian. gen. (type species:Zygochlamys nicolasiMorra, 1985), and the late Miocene–early PlioceneMoirechlamysn. gen., containingPecten actinodesSowerby, 1846 (type species) andChlamys auroraeFeruglio, 1954.Zygochlamysis restricted to includeZ. geminata(Sowerby, 1846) (type species),Z. jorgensisIhering, 1907, andZ. sebastianiMorra, 1985. The present analysis increases the biostratigraphic usefulness of the group and improves taxonomic knowledge of the Neogene molluscan assemblages defined previously for Patagonia.Zygochlamys geminatais confined to the latest Oligocene–early Miocene interval of the Austral Basin of Patagonia (Argentina) and to the early Miocene of Chile,Z. jorgensisis restricted to the early to middle Miocene of the Golfo San Jorge and northern Austral Basins, andMoirechlamysn. gen., the most widespread genus, occurs in the late Miocene–early Pliocene of the Austral, Golfo San Jorge, Valdés, and Colorado basins. All these genera are endemic to southern South America;Zygochlamysis not related to other circumpolar genera such asAustrochlamysJonkers, 2003 orPsychrochlamysJonkers, 2003, rejecting its dispersal in the Antarctic Circumpolar Current, as has been proposed previously.UUID:http://zoobank.org/55d7ea85-5ec5-477a-9ede-5d3d795b75b5

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Nonlinear Differential Equations Modeling the Antarctic Circumpolar Current

Journal of Mathematical Fluid Mechanics ◽

10.1007/s00021-021-00618-7 ◽

2021 ◽

Vol 23 (4) ◽

Author(s):

Jifeng Chu ◽

Kateryna Marynets

Keyword(s):

Fixed Point ◽

Differential Equations ◽

Boundary Conditions ◽

Topological Degree ◽

Antarctic Circumpolar Current ◽

Fixed Point Theorems ◽

Nonlinear Differential Equations ◽

Existence Results ◽

Circumpolar Current ◽

The Antarctic

AbstractThe aim of this paper is to study one class of nonlinear differential equations, which model the Antarctic circumpolar current. We prove the existence results for such equations related to the geophysical relevant boundary conditions. First, based on the weighted eigenvalues and the theory of topological degree, we study the semilinear case. Secondly, the existence results for the sublinear and superlinear cases are proved by fixed point theorems.

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