Reversed Magnetozone in the Late Pleistocene Sediments from the Pacific Coast of Odaka, Northeast Japan

1977 ◽  
Vol 7 (3) ◽  
pp. 372-379 ◽  
Author(s):  
Ken-Ichi Manabe
Keyword(s):  
Late Pleistocene ◽  
North Atlantic ◽  
Deep Sea ◽  
Pacific Coast ◽  
Marine Terrace ◽  
The North ◽  
The Pacific ◽  
The North Atlantic ◽  
Sea Cliff ◽  
Peak Field

Paleomagnetic measurements have been carried out on 103 specimens taken at about 15 cm intervals in a sea cliff exposing the marine terrace formation. Secondary components were removed by partial demagnetization in a peak field of 200 Oe. Two short reversed magnetozones are recognized. Geological and biostratigraphical evidence indicates that they are equivalent to the Blake event, which was first reported by Smith and Foster (1969) (Science 163 , 565–567) from the North Atlantic deep-sea cores. The present result suggests a split nature for the Blake Event.

Spectral Analysis of Late Pleistocene-Holocene Sediments

1973 ◽  
Vol 3 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Nicklas G. Pisias ◽  
J.Paul Dauphin ◽  
Constance Sancetta
Keyword(s):  
Spectral Analysis ◽  
Late Pleistocene ◽  
North Atlantic ◽  
Deep Sea ◽  
Significant Peak ◽  
The North ◽  
Holocene Sediments ◽  
Deep Sea Sediments ◽  
The North Atlantic ◽  
Random Fluctuations

AbstractSpectral analysis of deep-sea sediments indicates that the fluctuations in compositional parameters are not random fluctuations with time. Spectra show significant peaks representing periodicities in the data of 380, 1300, and 2600 years. Two of these periods are similar to periods reported in 14C fluctuations. Analysis of a paleotemperature curve from the North Atlantic shows that the characteristics of the fluctuations within interglacial and glacial stages of the climate are similar, and that the spectrum has a significant peak at 2600 years.

scholarly journals Host identification for the deep-sea snail genus Haliella with description of a new species (Caenogastropoda, Eulimidae)

ZooKeys ◽  
2020 ◽  
Vol 908 ◽  
pp. 19-30
Author(s):  
Tsuyoshi Takano ◽  
Shoichi Kimura ◽  
Yasunori Kano
Keyword(s):  
New Species ◽  
North Atlantic ◽  
Deep Sea ◽  
Type Species ◽  
Barents Sea ◽  
The North ◽  
The Pacific ◽  
The North Atlantic ◽  
Host Identification ◽  
A New Species

A new parasitic species of eulimid gastropod, Haliella seisuimaruaesp. nov., is described from bathyal (728–978 m) waters off the Pacific coasts of Japan. It shows the closest resemblance to the type species H. stenostoma from the North Atlantic and Barents Sea in having a tall shell with an almost straight outer lip, but differs in having a junction of the parietal wall and columellar lip at 38% of the aperture height from the suture (33% in H. stenostoma), a slightly wider aperture and a more curved and extended columellar lip. The holotype of H. seisuimaruaesp. nov. was found attached to an irregular sea urchin, Brissopsis sp. cf. luzonica (Spatangoida: Brissidae). This represents the first direct observation of parasitic ecology and echinoderm host for the genus Haliella. A new replacement name, Eulima tsushimensisnom. nov., is proposed here for Eulima stenostoma A. Adams, 1861, which is preoccupied by Eulima stenostoma Jeffreys, 1858 (type of Haliella).

Preliminary report on the North Atlantic deep-sea cores taken by the Geophysical Laboratory, Carnegie Institution

1937 ◽  
Vol 18 (1) ◽  
pp. 224
Author(s):  
W. H. Bradley ◽  
M. N. Bramlette ◽  
J. A. Cushman ◽  
L. G. Henbest ◽  
K. E. Lahman ◽  
...  
Keyword(s):  
North Atlantic ◽  
Deep Sea ◽  
Preliminary Report ◽  
Carnegie Institution ◽  
The North ◽  
The North Atlantic

The North Atlantic anchor: Canada and the Pacific Century

2018 ◽  
Vol 73 (3) ◽  
pp. 364-378 ◽  
Author(s):  
Kim Richard Nossal
Keyword(s):  
North Atlantic ◽  
Policy Making ◽  
International Order ◽  
Asia Pacific ◽  
The North ◽  
The Pacific ◽  
Defence Policy ◽  
Key Driver ◽  
The North Atlantic ◽  
Strategic Perspective

This paper surveys Canada’s ambivalence towards the Asia Pacific, and seeks to put that ambivalence into the broader context of the dominant strategic perspective in Canada that has privileged, and continues to privilege, a North Atlantic focus for Canadian foreign and defence policy. It argues that Canada’s laggardly approach to Asia Pacific diplomacy can be best explained by the widespread perception among Canadians—and their government—that the North Atlantic alliance should remain the key driver of Canadian foreign and defence policy. Indeed, this geostrategic outlook has actually intensified with the election of Donald J. Trump and his unorthodox approach to the transatlantic alliance and the liberal international order. I argue that this North Atlantic outlook, so dominant for so much of Canada’s history, will continue to anchor Canadian foreign and defence policy, making Canada’s engagement in the Asia Pacific more problematic.

A barotolerant ciliate isolated from the abyssal deep sea of the North Atlantic: Euplotes dominicanus sp. n. (Ciliophora, Euplotia)

2020 ◽  
Vol 73 ◽  
pp. 125664 ◽  
Author(s):  
Suzana Živaljić ◽  
Anja Scherwass ◽  
Alexandra Schoenle ◽  
Manon Hohlfeld ◽  
Pablo Quintela-Alonso ◽  
...  
Keyword(s):  
North Atlantic ◽  
Deep Sea ◽  
The North ◽  
The North Atlantic

scholarly journals Influence of Water Masses on the Biodiversity and Biogeography of Deep-Sea Benthic Ecosystems in the North Atlantic

2020 ◽  
Vol 7 ◽  
Author(s):  
Patricia Puerta ◽  
Clare Johnson ◽  
Marina Carreiro-Silva ◽  
Lea-Anne Henry ◽  
Ellen Kenchington ◽  
...  
Keyword(s):  
North Atlantic ◽  
Deep Sea ◽  
Water Masses ◽  
The North ◽  
Influence Of Water ◽  
The North Atlantic ◽  
Benthic Ecosystems

New species, occurrence records and observations of predation by deep-sea Asteroidea (Echinodermata) from the North Atlantic by NOAA ship Okeanos Explorer

Zootaxa ◽  
2020 ◽  
Vol 4766 (2) ◽  
pp. 201-260 ◽  
Author(s):  
CHRISTOPHER L. MAH
Keyword(s):  
North Atlantic ◽  
Deep Sea ◽  
Substantial Contribution ◽  
The North ◽  
In Situ Observations ◽  
The North Atlantic ◽  
Feeding Observations ◽  
Occurrence Records ◽  
In Situ Feeding

Exploratory cruises by the NOAA Ship Okeanos Explorer have resulted in a substantial contribution in our understanding of deep-sea echinoderm biodiversity, biology, and ecology in the North Atlantic. This includes the description and in situ feeding observations of two, new corallivorous goniasterid species, Evoplosoma nizinskiae n. sp. and Sibogaster bathyheuretor n. sp. Significant in situ observations include a synchronous feeding event including multiple goniasterid asteroids and a cidaroid urchin on a large demosponge, providing new data for understanding echinoderm feeding behavior, including agonistic behavior, in deep-sea settings and new, in situ feeding observations for 28 deep-sea species including the myxasterid Pythonaster atlantidis, the korethrasterid Remaster palmatus and the poorly understood hippasterine goniasterids, Gilbertaster caribaea and Sthenaster emmae. 

scholarly journals Molecular circumscription of new species of Gyrocotyle Diesing, 1850 (Cestoda) from deep-sea chimaeriform holocephalans in the North Atlantic

2020 ◽  
Vol 97 (3) ◽  
pp. 285-296
Author(s):  
Rodney A. Bray ◽  
Andrea Waeschenbach ◽  
D. Timothy J. Littlewood ◽  
Odd Halvorsen ◽  
Peter D. Olson
Keyword(s):  
New Species ◽  
North Atlantic ◽  
Deep Sea ◽  
The North ◽  
The North Atlantic

scholarly journals Biogeochemistry of the North Atlantic during oceanic anoxic event 2: role of changes in ocean circulation and phosphorus input

2014 ◽  
Vol 11 (4) ◽  
pp. 977-993 ◽  
Author(s):  
I. Ruvalcaba Baroni ◽  
R. P. M. Topper ◽  
N. A. G. M. van Helmond ◽  
H. Brinkhuis ◽  
C. P. Slomp
Keyword(s):  
Pacific Ocean ◽  
Ocean Circulation ◽  
North Atlantic ◽  
Primary Productivity ◽  
Low Oxygen ◽  
Deep Basin ◽  
The North ◽  
The Pacific ◽  
The Pacific Ocean ◽  
The North Atlantic

Abstract. The geological record provides evidence for the periodic occurrence of water column anoxia and formation of organic-rich deposits in the North Atlantic Ocean during the mid-Cretaceous (hereafter called the proto-North Atlantic). Both changes in primary productivity and oceanic circulation likely played a role in the development of the low-oxygen conditions. Several studies suggest that an increased input of phosphorus from land initiated oceanic anoxic events (OAEs). Other proposed mechanisms invoke a vigorous upwelling system and an ocean circulation pattern that acted as a trap for nutrients from the Pacific Ocean. Here, we use a detailed biogeochemical box model for the proto-North Atlantic to analyse under what conditions anoxia could have developed during OAE2 (94 Ma). The model explicitly describes the coupled water, carbon, oxygen and phosphorus cycles for the deep basin and continental shelves. In our simulations, we assume the vigorous water circulation from a recent regional ocean model study. Our model results for pre-OAE2 and OAE2 conditions are compared to sediment records of organic carbon and proxies for photic zone euxinia and bottom water redox conditions (e.g. isorenieratane, carbon/phosphorus ratios). Our results show that a strongly elevated input of phosphorus from rivers and the Pacific Ocean relative to pre-OAE2 conditions is a requirement for the widespread development of low oxygen in the proto-North Atlantic during OAE2. Moreover, anoxia in the proto-North Atlantic is shown to be greatly influenced by the oxygen concentration of Pacific bottom waters. In our model, primary productivity increased significantly upon the transition from pre-OAE2 to OAE2 conditions. Our model captures the regional trends in anoxia as deduced from observations, with euxinia spreading to the northern and eastern shelves but with the most intense euxinia occurring along the southern coast. However, anoxia in the central deep basin is difficult to achieve in the model. This suggests that the ocean circulation used in the model may be too vigorous and/or that anoxia in the proto-North Atlantic was less widespread than previously thought.

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