Sentences with phrase «atlantic water circulation»

Not exact matches

The Atlantic Ocean surface circulation is an important part of the Earth's global climate, moving warm water from the tropics towards the poles.

These large Northern Hemisphere cooling events have previously been linked to a change in the Atlantic Ocean circulation that led to a reduced transport of warm water to the high latitudes in the North.

The simulations suggest that over decades, these warming events dramatically perturb the ocean surface, affecting the flow of the Atlantic Meridional Overturning Circulation, a system of currents that acts like a conveyor belt moving water around the planet.

This would shut down a global ocean circulation system that is driven by dense, salty water falling to the bottom of the north Atlantic and that ultimately produces the Gulf Stream.

Retreating sea ice in the Iceland and Greenland Seas may be changing the circulation of warm and cold water in the Atlantic Ocean, and could ultimately impact the climate in Europe, says a new study by an atmospheric physicist from the University of Toronto Mississauga (UTM) and his colleagues in Great Britain, Norway and the United States.

The highest resolution GFDL model, CM2.6, matched the Northwest Atlantic circulation and water mass distribution most accurately,» said Vincent Saba, a NOAA fisheries scientist and lead author of the study.

Observations and the high - resolution climate model CM2.6 show a strong relationship between a weakening Atlantic Meridional Overturning Circulation (AMOC) and an increase in the proportion of warm - temperate slope water entering the U.S. Northeast Continental Shelf, primarily through the Gulf of Maine's Northeast Channel.

In the North Pacific, overturning circulation driven by formation of the North Pacific Intermediate Water is not as strong as in the North Atlantic, but it plays a major role in the region's climate.

For decades, research on climate variations in the Atlantic has focused almost exclusively on the role of ocean circulation as the main driver, specifically the Atlantic Meridional Overturning Circulation, which carries warm water north in the upper layers of the ocean and cold water south in lower layers like a large concirculation as the main driver, specifically the Atlantic Meridional Overturning Circulation, which carries warm water north in the upper layers of the ocean and cold water south in lower layers like a large conCirculation, which carries warm water north in the upper layers of the ocean and cold water south in lower layers like a large conveyor belt.

The deep circulation that drives warm surface waters north is weakening, leading to a cooling of the north Atlantic relative to the rest of the oceans.

The thermohaline circulation of the global ocean is controlled in part by freshwater inputs to northern seas that regulate the strength of North Atlantic Deep Water formation by reducing surface seawater density.

Model predictions from the North Atlantic have revealed that over 17 % of the seafloor area below 500 m depth will experience pH reductions exceeding 0.2 units by 2100 because of subduction of high - CO2 waters by thermohaline circulation (Gehlen et al., 2014).

There is also a contribution of excess atmospheric CO2 absorption introduced to deep - water masses from dense, cold CO2 - rich surface waters at downwelling sites (e.g., North Atlantic), which then move through the oceans via meridional overturning circulation.

Presently, much of the Atlantic Ocean is well oxygenated (Figure 1) relative to the North Indian and Pacific Oceans, where bottom water O2 concentrations are lower because of the biological removal of O2 as thermohaline circulation moves deep waters across ocean basins from the North and South Atlantic towards the North Pacific, in isolation from the surface ocean.

However, over longer terms, deep - water oxygenation may also increase even if Atlantic meridional overturning circulation becomes weaker, as deep convection in the Weddell Sea and Antarctic Bottom Water becomes enhanced (Yamamoto et al., 2water oxygenation may also increase even if Atlantic meridional overturning circulation becomes weaker, as deep convection in the Weddell Sea and Antarctic Bottom Water becomes enhanced (Yamamoto et al., 2Water becomes enhanced (Yamamoto et al., 2015).

Both observations and the climate model demonstrate a robust relationship between a weakening Atlantic Meridional Overturning Circulation (AMOC) and an increase in the proportion of Warm - Temperate Slope Water entering the Northwest Atlantic Shelf.

For years, perhaps decades, Gray has been ascribing all sorts of climate changes and hurricane cycles to fluctuations in the Thermohaline Circulation (THC), an overturning circulation in the Atlantic ocean associated with formation of deep water in the NortCirculation (THC), an overturning circulation in the Atlantic ocean associated with formation of deep water in the Nortcirculation in the Atlantic ocean associated with formation of deep water in the North Atlantic.

eg «These studies provide new insights on the sensitivity and response of meridional ocean circulation to melt water inputs to the North Atlantic high latitudes (e.g., Bamberg et al., 2010; Irvali et al., 2012; Morley et al., 2011) and their potential role in amplifying small radiative variations into large a climate response through dynamic changes in ocean - atmosphere interactions (e.g., Morely et al., 2011; Irvali et al., 2012; Morley et al., 2014).

This seems like it's going to keep tropical waters hotter and thus promote more hurricanes (in agreement with what Gray says (if one interprets his statements as referring to the portion of the atlantic circulation — the subtropical gyre — that delivers more warm water to the tropics).

The structure of the ocean circulation basically anchors this region to something like pre-industrial temperatures, at least until deep bottom water originating in the North Atlantic also warms.

Unlikely: this idea was based on the hypothesis that the Atlantic thermohaline circulation, which carries warm surface water to northern Europe, could be halted by the influx of fresh water from melting Arctic ice.

so surely the fresh water would get in to the North Atlantic circulation without surface melting.

Ultimately if the freshwater melt was a dominant (which seems hard to believe given the scale of the wind - driven gyre transport) factor, it would be entrained into the gyres at the surface and you'd see an overall freshening of North Atlantic surface waters to make the whole system more like the Pacific, which has a much weaker meridional overturning circulation.

Today, the fact that global warming could disturb the water cycle and lead to a slowing down of the North Atlantic circulation is a real subject of concern.

The Guardian says: «the Atlantic Meridional Overturning Circulation (Amoc), has weakened by 15 % since 1950, thanks to melting Greenland ice and ocean warming making sea water less dense and more buoyant.

It would mean the thermohaline circulation might slow down because fresher waters would lessen the downdraft of water in the Northern Atlantic.

Changes in oceanic circulation in the North Atlantic have influence on a planetary level by affecting, in particular, the water cycle.

This water was then transported to the higher latitudes, contributing to the weakening of deep oceanic circulation, thereby reinforcing the cooling above and around the North Atlantic.

So, on the one hand you have the claim that Atlantic hurricane intensity is controlled by the AMO, whose mechanism is poorly understood but which has something to do with the meridional overturning circulation, which is influenced by the sinking of water off of Greenland.

On the other hand, the AMO hypothesis asserts that natural changes in the deep water circulation of the Atlantic Ocean drive hurricane season SST resulting in changes to both hurricane activity and GT.

This is not necessarily a contradiction to the other data series, because the two sediment cores used are located in the area of the deep outflow of Labrador Sea Water — but this is only one of two deep currents that together make up the southward part of the overturning circulation of the Atlantic, and thus the heat transport to the north.

This influx of fresh water then disrupted the Atlantic Ocean circulation, in turn causing a seesawing of heat between the hemispheres.

The Atlantic Meridional Overturning Circulation, or AMOC, is a powerful conveyor - like current system that carries warm water north from the equator and sends cool water back down from the Arctic.

Holland says it is due to a change in the atmospheric circulation resulting in a change in the North Atlantic gyre which then has allowed warmer water into the South Greenland region.

-LRB-- NAO) This sea ice then melts in the Sub Polar Atlantic, releasing fresh water into the sub - polar Atlantic waters, which in turn impedes the formation of NADW, which slows down the thermohaline circulation causing warm air not to be brought up from the lower latitudes as far north as previous while in lessening amounts.

In the North Atlantic Ocean, variations in the ocean circulation affect the heat exchange to the deeper waters of the ocean.

In recent years research tied the Bølling - Allerød warming to the release of heat from warm waters originating from the deep North Atlantic Ocean, possibly triggered by a strengthening of the Atlantic meridional overturning circulation (AMOC) at the time.

The vertically integrated inventory of human emitted CO2 in the oceans is (not surprisingly) much greater in areas of cold deep convection, especially in the northern Atlantic (the falling leg of the thermohaline circulation), and much less in the tropics where the ocean is strongly stratified; absorption in the tropics really is more in the near - surface waters.

The Atlantic Meridional Overturning Circulation (AMOC)- the transport of warm tropical surface water northward - is indeed propelled by dense water sinking in the North Atlantic and travelling equatorward in the deeper layers, but it also has a wind - driven component to it.

Oceanographically, the Southern Ocean is a major driver of global ocean circulation and plays a vital role in interacting with the deep water circulation in each of the Pacific, Atlantic, and Indian oceans.

So warmer - than - normal surface waters in the South Atlantic created by the changes in atmospheric circulation during an El Niño should be transported northward into the North Atlantic (and vice versa for a La Niña).

The waters that underlie the near - surface subtropical waters have freshened due to equatorward circulation of the freshened subpolar surface waters; in particular, the fresh intermediate water layer (at ~ 1,000 m) in the SH has freshened in both the Atlantic and Pacific Oceans.

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.

This subtropical gyre of warm North Atlantic Central Water is the hub of the energy that drives the North Atlantic circulation.

The dramatic finding comes from a study of ocean circulation in the North Atlantic, which found a 30 % reduction in the warm currents that carry water north from the Gulf Stream.

The Pentagon report describes a scenario in which human - caused global warming leads to a near - term collapse of the ocean's thermohaline circulation, which brings warm surface waters from the tropics to the North Atlantic, warming parts of Western Europe.

The overturning circulation pushes water through the Atlantic Basin, distributing heat as it moves warmer surface water from the tropics toward Greenland and the high northern latitudes and carries colder, deeper water from the North Atlantic southward.

The unusually high sea ice surface temperatures reflect a shift in ocean circulation, enhancing the import of warm, Atlantic - derived waters into the Arctic Ocean.

K. Billups, A. C. Ravelo, J. C. Zachos, «Early Pliocene deep water circulation in the western equatorial Atlantic: Implications for high - latitude climate change,» Paleooceanography 13: (1) 84 - 95 (February 1998).

The influx could slow down or shut off the North Atlantic Deep Water (NADW) formation, the driving factor behind the conveyor belt current known as thermohaline circulation, which brings large amounts of warm water to the North Atlantic reWater (NADW) formation, the driving factor behind the conveyor belt current known as thermohaline circulation, which brings large amounts of warm water to the North Atlantic rewater to the North Atlantic region.