Sentences with phrase «of ocean circulation changes»

This thesis presents the results of several general circulation model simulations aimed at studying the effect of ocean circulation changes when they occur in conjunction with increased atmospheric trace gas concentrations.

There is still debate over what kind of ocean circulation change causes the change in heat transport.

Not exact matches

The foundation of the research involved tracking the changes in ocean circulation in new detail by studying three sediment cores extracted from the seafloor of the Gulf of Mexico in 2010 during a scientific cruise.

That wind - driven circulation change leads to cooler ocean temperatures on the surface of the eastern Pacific, and more heat being mixed in and stored in the western Pacific down to about 300 meters (984 feet) deep, said England.

This trade wind strengthening, which occurs during a the negative phase of a phenomenon called the Interdecadal Pacific Oscillation (also known as the Pacific Decadal Oscillation), pushes warm water westward and and changes Pacific Ocean circulation.

Looking at shifts in Manley's winter temperatures from year to year, he says, gives a good reading of important natural cycles that influence climate, such as changes in ocean circulation like the North Atlantic Oscillation.

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.

Changes in polar vortex winds high in the stratosphere can alter the global conveyor belt of ocean circulation.

Greatly improved computer models began to suggest how such jumps could happen, for example through a change in the circulation of ocean currents.

Ongoing changes in ocean circulation patterns, which are helping to drive warm water from other parts of the sea closer to the Antarctic continent, are also believed to be a major factor.

«We argue that it was the establishment of the modern deep ocean circulation — the ocean conveyor — about 2.7 million years ago, and not a major change in carbon dioxide concentration in the atmosphere that triggered an expansion of the ice sheets in the northern hemisphere,» says Stella Woodard, lead author and a post-doctoral researcher in the Department of Marine and Coastal Sciences.

Gross says that the most important processes affecting day length are changes in the weather, especially unusual variations in the strength and direction of the winds, which bring on alterations in the global circulation of the atmosphere and ocean.

But within these long periods there have been abrupt climate changes, sometimes happening in the space of just a few decades, with variations of up to 10ºC in the average temperature in the polar regions caused by changes in the Atlantic ocean circulation.

Climate changes that began ~ 17,700 years ago included a sudden poleward shift in westerly winds encircling Antarctica with corresponding changes in sea ice extent, ocean circulation, and ventilation of the deep ocean.

It takes centuries for that heat to work its way into the deeper ocean, changing the circulation and removing the sea ice, which is a big part of this process,» he said.

«These conditions will cause changes in phytoplankton growth and ocean circulation around Antarctica, with the net effect of transferring nutrients from the upper ocean to the deep ocean,» said lead author J. Keith Moore, UCI professor of Earth system science.

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.

He believes that no one has thought of combining the two theories before because it's not an intuitive idea to look at how the effects of changing patterns of ocean circulation, which occur on time scales of thousands of years, would effect global silicate weathering, which in turn controls global climate on time scales of 100s of thousands of years.

The second theory focuses on dramatic changes in the patterns of ocean circulation.

«Formation of coastal sea ice in North Pacific drives ocean circulation, climate: New understanding of changes in North Pacific ocean circulation over the past 1.2 million years could lead to better global climate models.»

The deepening of the Drake Passage resulted in a change in ocean circulation that resulted in warm waters being directed northwards in circulation patterns like those found in the Gulf Stream that currently warms northwestern Europe.

And what we see is both how complex climate changes can be and how profound an effect changing patterns of ocean circulation can have on global climate states, if looked at on a geological time scale.»

James Kennett of the University of California at Santa Barbara adds that salinity changes might have had a greater influence on the circulation of Eocene oceans than on that of today's oceans.

In the North Atlantic, more heat has been retained at deep levels as a result of changes to both the ocean and atmospheric circulations, which have led to the winter atmosphere extracting less heat from the ocean.

Its measurements of ocean saltiness will also help scientists understand how changes in salinity affect the deep currents that drive ocean circulation.

They were able to show that episodes of extinction coincided with pulses of ocean anoxia, driven by changes in ocean circulation and nutrient levels.

He believes that changes in ocean circulation have warmed the Atlantic and increased hurricane activity in the past decade and that this is simply the result of normal oscillation in natural climate cycles.

A new analysis using changes in cloud cover over the tropical Indo - Pacific Ocean showed that a weakening of a major atmospheric circulation system over the last century is due, in part, to increased greenhouse gas emissions.

They will look for evidence of temperature changes caused by ocean circulation patterns in both the North Atlantic and tropical Pacific Oceans, which drive precipitation in Tibet as well as the Indian monsoons.

The cruise was part of the international GEOTRACES program, which aims to measure chemical tracers in the world's ocean to understand ocean circulation and provide a baseline to assess future chemical changes in the oceans.

Anderson and Allen suggest that the changes reflect an influx of moisture from the Pacific Ocean, probably due to changing global circulation (Science, vol 260, p 1920).

As a result, the frigid flow plays a critical role in regulating circulation, temperature, and availability of oxygen and nutrients throughout the world's oceans, and serves as both a barometer for climate change and a factor that can contribute to that change.

«Such a slowdown is consistent with the projected effects of anthropogenic climate change, where warming and freshening of the surface ocean from melting ice caps leads to weaker overturning circulation,» DeVries explained.

Some research has tied it to a series of small volcanic eruptions around the globe while other findings have linked it to the changes in winds and ocean circulation.

They were Jorge Sarmiento, an oceanographer at Princeton University who constructs ocean - circulation models that calculate how much atmospheric carbon dioxide eventually goes into the world's oceans; Eileen Claussen, executive director of the Pew Center for Global Climate Change in Washington, D.C.; and David Keith, a physicist with the University of Calgary in Alberta who designs technological solutions to the global warming problem.

However, Khazendar and Scheuchl said, researchers need more information on the shape of the bedrock and seafloor beneath the ice, as well as more data on ocean circulation and temperatures, to be able to better project how much ice these glaciers will contribute to the ocean in a changing climate.

New understanding of changes in North Pacific ocean circulation over the past 1.2 million years could lead to better global climate models

Your statement that «Thus it is natural to look at the real world and see whether there is evidence that it behaves in the same way (and it appears to, since model hindcasts of past changes match observations very well)» seems to indicate that you think there will be no changes in ocean circulation or land use trends, nor any subsequent changes in cloud responses thereto or other atmospheric circulation.

We know, however, that rapid warming of the planet increases the risk of crossing climatic points of no return, possibly setting in motion large - scale ocean circulation changes, the loss of major ice sheets, and species extinctions.

The understanding of the atmospheric circulation changes, later to be discovered to be connected to the appearance of El Niño events, was originally motivated by reasons other than ocean currents.

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As far as we understand them, they are due to a redistribution of heat within the earth system, very likely due to ocean circulation changes.

«The Greenland ice sheet as a whole is shrinking, melting and reducing in size as the result of globally changing air and ocean temperatures and associated changes in circulation patterns in both the ocean and atmosphere,» Muenchow said.

...» Meltwater from glacial Lake Agassiz (southwest of Hudson Bay) draining catastrophically into the North Atlantic via Lake Superior and the St. Laurence seaway was once thought to have initiated ocean circulation changes leading to the Younger Dryas cold period.

The goal is to capture natural variations in the climate, like changes in ocean circulation or features like the El Niño Southern Oscillation, that are swamped by the signal of human - caused warming when looking out to the end of the century.

Climate change is playing a major role in the slowing down of the circulation of the Atlantic Ocean.

In applying them, they found that a more realistic representation of the marine ecosystem helped the ocean to take up and store carbon at similar rates regardless of global changes in physical properties, like temperature, salinity and circulation.

Suppose also that — DESPITE THIS STABILIZING MECHANISM some as - yet unknown ocean circulation cycle operates that is the sole cause of the Holocene centennial scale fluctuations, and that this cycle has reversed and is operating today, yielding a temperature change that happens to mimic what models give in response to radiative forcing changes.

The results, reported in the journal Nature Geoscience, have consequences for many fields of science, including the study of ocean circulation and past climate change.

A more likely scenario is that changes in the ocean circulation are a consequence of wind shifts.