scholarly journals I. On tidal currents in the ocean

1888 ◽  
Vol 43 (258-265) ◽  
pp. 340-347
Keyword(s):  
Gulf Stream ◽  
Tidal Currents ◽  
Open Ocean ◽  
General Direction ◽  
Oceanic Currents

It is frequently asserted and commonly believed that tidal currents do not exist in the open ocean or in waters remote from land. Oceanic currents, that is, streams which set more or less constantly in one general direction, are well-known and, from their importance to navigation, have been the objects of much study. Chief among these may be mentioned the Gulf Stream and the Equatorial Currents in both oceans.

Gulf stream cold core rings: large-scale interaction sites for open ocean plankton communities

1976 ◽  
Vol 23 (8) ◽  
pp. 695-710 ◽  
Author(s):  
Peter H. Wiebe ◽  
Edward M. Hulburt ◽  
Edward J. Carpenter ◽  
Andrew E. Jahn ◽  
George P. Knapp ◽  
...  
Keyword(s):  
Gulf Stream ◽  
Large Scale ◽  
Open Ocean ◽  
Scale Interaction ◽  
Interaction Sites ◽  
Cold Core ◽  
Plankton Communities

How did they get here? The biogeography of the marine molluscs of the Azores

2009 ◽  
Vol 180 (4) ◽  
pp. 295-307 ◽  
Author(s):  
Sérgio P. Ávila ◽  
Carlos Marques Da Silva ◽  
Ralf Schiebel ◽  
Fabbrizzio Cecca ◽  
Thierry Backeljau ◽  
...  
Keyword(s):  
Shallow Water ◽  
Gulf Stream ◽  
Geographical Location ◽  
Fine Sand ◽  
Tropical Species ◽  
Short Term ◽  
Marine Molluscs ◽  
Molluscan Fauna ◽  
Oceanic Currents ◽  
Santa Maria

Abstract The geographical location of the Azores, midway between Europe and America, poses problems relative to their colonization and the biogeographic affinity of the biota presently living there. In the way of the Gulf Stream, originating off American shores, the Azorean biota, marine and terrestrial alike is predominantly European. To explain this distributional paradigm the present study investigates the Neogene fossil record of Santa Maria, Azores in order to establish the biogeographical relationships of the Pleistocene to Recent littoral molluscan fauna of this archipelago. The bulk of the Azorean malacofauna, both in the Pleistocene (71.3%) and in Recent times (75.6%) is biogeographically related with the eastern Atlantic, and that the Pleistocene (Eemian) fossil fauna is basically the same as the Recent fauna, with a few losses of tropical species and of shallow water bivalves associated to fine sand substrates. It is hypothesized that during Pleistocene glacial-interglacial cycles, short-duration events have occurred during which short-lived oceanic currents must have been established, especially during or shortly after glacial terminations. During these short-term events, the arrival of species to the Azores may have been increased and facilitated by temporary sea-surface currents that no longer exist now. Probable routes of dispersal to the archipelago of the Azores are also discussed, as well as the possible influence of the Pleistocene glaciations in the shallow water marine molluscs of these islands.

scholarly journals A Shelf Water Cascading Event near Cape Hatteras

2021 ◽  
Author(s):  
Lu Han ◽  
Harvey Seim ◽  
John Bane ◽  
Robert E. Todd ◽  
Mike Muglia
Keyword(s):  
Continental Shelf ◽  
Gulf Stream ◽  
Stream Water ◽  
Subsurface Layer ◽  
Open Ocean ◽  
South Atlantic Bight ◽  
Shelf Water ◽  
Carbon Export ◽  
Middle Atlantic ◽  
Cape Hatteras

AbstractCarbon-rich Middle Atlantic Bight (MAB) and South Atlantic Bight (SAB) shelf waters typically converge on the continental shelf near Cape Hatteras. Both are often exported to the adjacent open ocean in this region. During a survey of the region in mid-January 2018, there was no sign of shelf water export at the surface. Instead, a subsurface layer of shelf water with high chlorophyll and dissolved oxygen was observed at the edge of the Gulf Stream east of Cape Hatteras. Strong cooling over the MAB and SAB shelves in early January led to shelf waters being denser than offshore surface waters. Driven by the density gradient, the denser shelf waters cascaded beneath the Gulf Stream and were subsequently entrained into the Gulf Stream, as they were advected northeastward. Underwater glider observations 80 km downstream of the export location captured 0.44 Sv of shelf waters transported along the edge of the Gulf Stream in January 2018. In total, as much as 7×106 kg of carbon was exported from the continental shelf to a greater depth in the open ocean during this 5-day-long cascading event. Earlier observations of near-bottom temperature and salinity at a depth of 230 m captured several multiday episodes of shelf water at a location that was otherwise dominated by Gulf Stream water, indicating that the January 2018 cascading event was not unique. Cascading is an important, yet little-studied pathway of carbon export and sequestration at Cape Hatteras.

scholarly journals A Study of the Distributions of Two Endangered Sea Skaters Halobates matsumurai Esaki and Asclepios shiranui (Esaki) (Hemiptera: Gerridae: Halobatinae) with Special Reference to Their Strategies to Cope with Tidal Currents

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Terumi Ikawa ◽  
Yuichi Nozoe ◽  
Natsuko Yamashita ◽  
Namiko Nishimura ◽  
Satoshi Ohnoki ◽  
...  
Keyword(s):  
Special Reference ◽  
Intertidal Zone ◽  
Tidal Currents ◽  
Open Ocean ◽  
Survival Strategies ◽  
Close Relative ◽  
Coastal Species ◽  
Coastal Sea ◽  
Oceanic Species

There exist surprisingly few marine insects, most of which are confined to the intertidal zone. Halobates is the only genus to have some oceanic species along with some coastal species. Among the coastal sea skaters, that is, genus Halobates and its close relative, genus Asclepios, there are variations in their affinity for the shore. We have studied the distributions of two endangered Japanese sea skaters, Halobates matsumurai and Asclepios shiranui in Kujukushima, where they cooccur in coves. To compare their survival strategies at sea, we especially noted differences in their distributions along the shore during high and low tides. The results show that A. shiranui tended to remain along the shore during low tide. This species appeared to cling to the shore against the ebb current and to stay in the protected coves. By contrast, H. matsumurai tended to leave the shore during low tide. Notably, some adults were found skating outside the coves. The strategy of H. matsumurai appeared to be leaving with the ebb current even beyond the coves, thereby using more resources and enlarging its habitat. Some such coastal Halobates might have acquired the ability to live on the open ocean clearly independent of the shoreline.

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