Sentences with phrase «gyre current»

Not exact matches

If you trawl a fine mesh net through any of the globe's five subtropical gyres — giant ocean vortexes where currents converge and swirl unhurriedly — you will haul on deck a muddle of brown planktonic goop, the occasional fish, squid or Portuguese man - of - war — and, almost certainly, a generous sprinkling of colourful plastic particles, each no larger than your fingernail.

Ocean currents have been carrying floating debris into all five of the world's major oceanic gyres for decades.

SeaWiFS data show that photosynthesizing organisms have declined in certain ocean gyres (large - scale surface current patterns), said Jim Yoder, a scientist at the Woods Hole Oceanographic Institution, in a NASA article commemorating the end of SeaWiFS's mission.

Such accumulation zones are created when large amounts of floating plastic debris are caught by ocean currents and concentrate in the centre of gyre systems.

These are the currents that make up the North Pacific Gyre.

The scientists then plopped them — the biggest, seven inches long — off the coast of Florida and into the Gulf Stream, which is part of the North Atlantic Gyre, a system of currents that flows clockwise up the U.S. East Coast.

This rubbish - strewn patch floats within the North Pacific Gyre, the center of a series of currents several thousand miles wide that create a circular effect, ensnaring trash and debris.

On track, for these turtles, means following a warm, food - rich current system known as the North Atlantic gyre.

Here we report that hatchling loggerheads, when exposed to magnetic fields replicating those found in three widely separated oceanic regions, responded by swimming in directions that would, in each case, help keep turtles within the currents of the North Atlantic gyre and facilitate movement along the migratory pathway.

Southerly katabatic winds and coastal currents produced the circulation field and retentive gyre shown in (a).

As may be expected from the positions of ocean currents, most mixing in the upper layers of the ocean takes place on the western boundaries of ocean gyres where the current speeds are greatest.

The patch is in an area of ocean between California and Hawaii called the North Pacific Subtropical Gyre — a kind of swirling dead end for Pacific currents, which have been depositing floating plastic trash there for decades.

An island of floating plastic garbage twice the size of Texas is trapped within the current gyre in the middle of the North Pacific Ocean.

[Response: The classical (i.e. Stommel) theory of the subtropical gyre requires that the interior equatorward (Sverdrup) transport that takes place everywhere but a narrow strip along the western edge of the basin, precisely balance the poleward transport that takes place in a narrow boundary current along the western edge of the basin.

In 2012, a new record low was established, and a contributor to this was an unusually warm current that merged with the Beaufort Sea Gyre.

Where the poleward & equatorward currents of this intensified circulation converge — the centre of the gyres — surface water is pumped downwards into the ocean interior in a process known as Ekman pumping.

In an email chat, Yair Rosenthal of Rutgers University and Braddock Linsley of Columbia University, whose related work was explored here in 2013, said the Argo analysis appeared to support their view that giant subtropical gyres are the place where heat carried on currents from the tropics descends into the deeper ocean.

This is to be expected because the spin - up of the wind - driven ocean circulation speeds up the currents (Ekman transport) which carry heat out of the tropics in the near - surface layers toward the subtropical ocean gyres.

a) The wind driven gyre fills the entire basin (between the rapid western boundary current and the slower southward returning currents in the rest of the Atlantic), and extends vertically down to the top of the NADW.

But if you want a very rough idea... (others will no doubt correct me) then the wind - driven circ ends up being a large gyre, which concentrates into a narrow current along the western boundary, with a much broader return in the rest of the basin — William]

Because of ocean currents and winds, a large chunk of the gyre's trash now eventually lands on the shores of the Hawaiian archipelago.

The warm sea surface temperatures in the gyres, during hiatus decades, indicate convergence of near - surface currents and strong downwelling of heat.

I also have a hard time understanding how the Gulf Stream — the western boundary current of the North Atlantic gyre — would weaken much under global warming, as it is driven by a physical process, gyre circulation, amplified by the presence of the coastline: http://oceanmotion.org/html/background/western-boundary-currents.htm

Conceptually, it's hard to see how the Gulf Stream western boundary current could be weakened by conditions around Greenland; this is a fluid dynamics system, not a mechanical «belt»; a backup due to less deep water formation should have little effect on the physics of the gyre and the formation of the western boundary current, and it also seems the tropical warming and the resulting equator - to - pole heat transport are the drivers — but perhaps modulation by jet stream meandering is playing some role in the cooling?

Many of the surface currents of the world oceans (i.e., the ocean «gyres» which appear as rotating horizontal current systems in the upper ocean) are driven by the wind, however, the sinking in the Arctic is related to the buoyancy forcing (effects that change either the temperature or salinity of the water, and hence its buoyancy).

Although one may think that's a good thing, it doesn't really mean that the South Pacific is cleaner but that the currents in this part of the ocean create a tighter gyre and thus the garbage may be more concentrated.

Drexel Environmental Science Graduate Student [ANDY REVKIN says: Some of the sea ice on the Arctic Ocean kind of circles in a gyre, like a slow turntable, and much of it is ejected perpetually past Greenland into the North Atlantic by winds and currents.

«The ocean's five major gyres, giant swirling currents, often trap this debris, turning the ocean into a toxic plastic soup.»

To get a glimpse of what was going on in the dark, the researchers looked at samples from two subtropical gyres, or systems of rotating ocean currents, in the South Atlantic and North Pacific.

The amount of warm water entering the Irminger Current is particularly limited because the sub-Polar gyre also shunts the pole - ward transport to the east towards the Barents Sea.

13 Gyres Vertical columns or mounds of water at the surface and flow around them Produce enormous circular currents Five major locations: North Pacific - clockwise South Pacific - counterclockwise Indian Ocean - counterclockwise South Atlantic - counterclockwise North Atlantic - clockwise

The strength of the Icelandic Low is the critical factor in determining path of the polar jet stream over the North Atlantic In the winter the IL is located at SW of Greenland (driver Subpolar Gyre), but in the summer the IL is to be found much further north (most likely driver the North Icelandic Jet, formed by complex physical interactions between warm and cold currents), which as graphs show had no major ups or downs.

The strength of the Icelandic Low is the critical factor in determining path of the polar jet stream over the North Atlantic In the winter the IL is located at SW of Greenland (Subpolar Gyre) In summer the IL is to be found much further north (most likely the North Icelandic Jet, formed by complex physical interactions between warm and cold currents) These two run under two different regimes and two clocks (see the CET synthesis from 3 harmonics, one for each summer and winter, and one common — see the above link, bottom graph).

Because gyres are systems of circulating currents, they result in marine debris accumulation at their centers.

pressure, wind, waves, & gyres visualizing & understanding coherence of terrestrial surface pressure, wind, waves, & currents (ocean gyres)

Most of the deep ocean warming is occurring in the subtropical ocean gyres - vast rotating masses of water in each ocean basin where near - surface currents converge and are forced downward into the ocean interior.

Note that there is also poleward transport in the shallow currents at the western edge of each subtropical ocean gyre - known as western boundary currents.

As the North Atlantic subtropical gyre spun - up in response to the trade wind - forcing, the gulfstream, the powerful ribbon - like western boundary current travelling north along the North American coast at the edge of the gyre, intensified.

Roemmich et al (2007) suggest that mid-latitude gyres in all of the oceans are influenced by decadal variability in the Southern and Northern Annular Modes (SAM and NAM respectively) as wind driven currents in baroclinic oceans (Sverdrup, 1947).

These two near - surface currents converge in the centre of the subtropical ocean gyres and, with nowhere else to go, the water is directed downward into the ocean interior (known as Ekman pumping).

Some of the warm water would be subducted by Atlantic Meridional Overturning Circulation / Thermohaline Circulation, some would be carried by ocean currents into the Arctic Ocean where it would melt sea ice, and the remainder would be spun southward by the North Atlantic gyre toward the tropics so it could be warmed more by the effects of the slower - than - normal trade winds.

not entirely clear, but since it is the north leg of the NAO (Icelandic pressure) that is determinant, it presumably takes some years for the warm atlantic currents to reach the Arctic and return as cold currents via Denmark Strait (Icelandic pressure) and few more years to loop into the subpolar gyre to initiate AMO oscillation Hence in order of occurrence NAP > NAO > AMO (refer to http://www.vukcevic.talktalk.net/NAOn.htm one but last illustration) Just as a reminder compare NAP waveform with the CET spectrum components (1660 - 2021) http://www.vukcevic.talktalk.net/CET-NV.htm I hope some of the above helps, but if not than your «how you cook up your «secret recipe» NAP misgiving is by far safer than accepting «blanco» assurance.

The circulation to the south on the southern rim of the subtropical gyre is completed by the westward - flowing North Equatorial Current, part of which flows into the Gulf of Mexico; the remaining part flows northward as the Antilles Current.

Because of the energy of the subtropical gyre and its associated currents, these short - term fluctuations have little influence on it, however.

The southward - flowing currents are generally weaker than the Gulf Stream and occur in the eastern part of the North Atlantic Central Water lens or the subtropical gyre.

Winds and storms pushing into lower latitudes spin up the gyres pushing cold polar water into the Californian and Peruvian currents facilitating deep ocean upwelling.

The cool phase starts with upwelling which starts with flows in the Peruvian and Californian Currents spinning up with the Pacific gyres.

More salt is La Niña as wind and currents spin up gyres and upwelling increases...

The two gyres share the eastward extension of western boundary currents, such as the Gulf Stream or Kuroshio, and are induced by the shear in the winds that cross the respective ocean basins.

These range from few years (Beaufort gyre 4 years, Circumpolar current 8 years, Indian ocean gyre 10 years, N. Atlantic subpolar gyre 20 years etc.) up to above 100 years for some of the Pacific gyres, and finally the great ocean conveyor belt estimated at ~ 1600 years.