Elevation Rain Shadows Zones of Latitude Topography Cities Factors that affect climate
Warm Currents Ocean Currents Cold Currents
Not exact matches
Changes in
ocean currents are also lead to upwelling of
warm water, which also increases evaporation — and thus snow.
Sensors that have plumbed the depths of Arctic seas since 2002 have found
warm currents creeping up from the Atlantic
Ocean and helping drive the dramatic retreat of sea ice there over the last decade.
In the
current context of global
warming it is important to assess the impacts that changes in
ocean and climate may have on Antarctica, and reconstructing past climate fluctuations provides vital information on the responses and possible feedback mechanisms within the climate system.
Ocean currents bringing unusually
warm water, for instance, could shift away more from Greenland, or move in closer, he said.
The causes of the
warming remain debated, but Liu and his team homed in on the melting glacial water that poured into
oceans as the ice receded, paradoxically slowing the
ocean current in the North Atlantic that keeps Europe from freezing over.
A system of
ocean currents, popularly referred to as the «Great Ocean Conveyor,» brings warm waters to the North Atla
ocean currents, popularly referred to as the «Great
Ocean Conveyor,» brings warm waters to the North Atla
Ocean Conveyor,» brings
warm waters to the North Atlantic.
«Using a numerical climate model we found that sulfate reductions over Europe between 1980 and 2005 could explain a significant fraction of the amplified
warming in the Arctic region during that period due to changes in long - range transport, atmospheric winds and
ocean currents.
The incoming water, part of the global conveyor belt of
currents circulating throughout the
oceans, is relatively
warm and salty compared with the rest of the Southern
Ocean.
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.
If you decouple that ice from where it's grounded — something that
currents of
warming water, already circulating around the Antarctic coast, could do — then water could flow beneath the inland ice and lubricate its slide into the
ocean.
Some glaciers on the perimeter of West Antarctica are receiving increased heat from deep,
warm ocean currents, which melt ice from the grounding line, releasing the brake and causing the glaciers to flow and shed icebergs into the
ocean more quickly.
The Arctic took another 3,000 - 4,000 years to
warm this much, primarily because of the fact that the Northern Hemisphere had huge ice sheets to buffer
warming, and the fact that changes in
ocean currents and Earth's orbital configuration accelerated
warming in the south.
Map of
current land and ice separating the Weddell and Ross seas, courtesy of Wikimedia Commons / Wutsje / CIA Octopuses have made themselves at home in most of the world's
oceans — from the
warmest of tropical seas to the deep, dark reaches around hydrothermal vents.
They found that adding five years of strong trade winds created powerful
ocean currents that buried the
warm surface water, bringing cooler water to the surface.
He warned on Tuesday that
warming ocean currents east of Greenland were melting ice in the seabed.
The Pacific
Ocean's
current cool phase is driving the global
warming slowdown — but that countering effect is not going to last, scientists say.
As the
oceans have
warmed and the climate has changed, hotspots are developing in regions where the
currents that transport
warm tropical waters towards the poles are strengthening.
Velicogna and her colleagues also measured a dramatic loss of Greenland ice, as much as 38 cubic miles per year between 2002 and 2005 — even more troubling, given that an influx of fresh melt water into the salty North Atlantic could in theory shut off the system of
ocean currents that keep Europe relatively
warm.
At the same time, the Indian
Ocean Dipole, a
current discovered only in the past decade, cools the eastern tropics and
warms western
currents, lessening spring rains in the southeast.
The Arctic
Ocean continually loses thick, old ice, the kind that easily survives a
warm summer, as
currents sweep it out the Fram Strait, east of Greenland.
Our global climate models zoom down to finer and finer resolutions; our satellites reveal remote corners of the globe; we increase our understanding of the response of giant ice sheets and deep
ocean currents to a
warming planet.
But as the two shelves are on opposite sides of the peninsula and subject to different
ocean currents, he says, «it was probably due to atmospheric
warming».
Under normal conditions, the trade winds and
ocean currents in the tropical Pacific travel from the Americas to Asia, maintaining a pool of very
warm water and a related area of intense tropical rainfall around Indonesia.
Starting from the same kernel of scientific truth as did The Day After Tomorrow — that global
warming could disrupt
ocean currents in the North Atlantic — a study commissioned by the Pentagon, of all organizations, concluded that the «risk of abrupt climate change... should be elevated beyond a scientific debate to a U.S. national security concern.»
Changes in
ocean currents, Kennett says, triggered the methane bursts by channeling
warmer water over continental slopes, as at Storegga.
Schimdt has found evidence that
warm ocean currents and convective forces beneath Europa's frozen shell can cause large blocks of ice to overturn and melt, bringing vast pockets of water, sometimes holding as much liquid as all of the Great Lakes combined, to within several kilometers of the moon's icy surface.
Extreme weather does not prove the existence of global
warming, but climate change is likely to exaggerate it — by messing with
ocean currents, providing extra heat to forming tornadoes, bolstering heat waves, lengthening droughts and causing more precipitation and flooding.
El Nino's mass of
warm water puts a lid on the normal
currents of cold, deep water that typically rise to the surface along the equator and off the coast of Chile and Peru, said Stephanie Uz,
ocean scientist at Goddard Space Flight Center in Greenbelt, Maryland.
It will show Manhattan frozen solid after the
warm ocean current known as the Gulf Stream shuts down.
Unexpectedly, this more detailed approach suggests changes in Antarctic coastal winds due to climate change and their impact on coastal
currents could be even more important on melting of the ice shelves than the broader
warming of the
ocean.
If it is permanent, «it is logical to suggest that the winds and
ocean currents change accordingly and switch us into a new regime where heat is not buried so deeply, and we jump to the next level in global
warming,» Trenberth said.
The observed increase in freshwater content will affect the conditions in all Greenland fjords and may ultimately affect the global
ocean currents that keep Europe
warm.
Persistent mass of
warm water is reshuffling
ocean currents, marine ecosystems, and inland weather.
«Our research indicates that as global
warming continues, parts of East Antarctica will also be affected by these wind - induced changes in
ocean currents and temperatures,» Dr Jourdain said.
«When we included projected Antarctic wind shifts in a detailed global
ocean model, we found water up to 4 °C
warmer than
current temperatures rose up to meet the base of the Antarctic ice shelves,» said lead author Dr Paul Spence from the ARC Centre of Excellence for Climate System Science (ARCCSS).
«Even in this
current warming climate, some mountains are so high that the temperatures are still below freezing, and the
warming ocean may provide more precipitation to drive some of the glaciers to advance,» Batbaatar said.
The
warm waters give up their heat in the bitterly cold regions monitored by OSNAP, become denser, and sink, forming
ocean - bottom
currents that return southward, hugging the perimeter of the
ocean basins.
The science team obtained vital information about the physical characteristics within one large
warm - water eddy, which likely originated from the North Brazil
Current, and analyzed its potential influence on sub-surface
ocean conditions during the passage of tropical cyclones.
A March study shows that one large swath of the ice sheet sits on beds as deep as 8,000 feet below sea level and is connected to
warming ocean currents.
For example, contrary to their assertion,
current conditions in the eastern Pacific are almost the antithesis of projected conditions for most reef systems under global
warming and
ocean acidification.
The shelves slow and stabilize the glaciers behind them, but they are succumbing to a hidden force: Deep,
warming ocean currents are melting the ice from beneath.
While the glaciers in this region seemed stable, it turns out
warming ocean currents have been melting the underside of the ice.
East Antarctica, situated on high ground that protects it from
warming ocean currents, was considered stable.
That's because a
current of cold
ocean water moves from north to south along the West Coast, cooling the coastal Pacific and removing the threat of hurricanes, which form only when low pressure systems siphon off the energy from
warm ocean water.
One of the most outstanding and diverse coral reefs in the world is found in the Ryukyu Archipelago, a group of subtropical islands and islets belonging to Japan and blessed by the
warm Kuroshio
ocean current.
Sea ice and icebergs also melt as
ocean currents carry them to
warmer places farther from the poles.
Climate models do not predict an even
warming of the whole planet: changes in wind patterns and
ocean currents can change the way heat is distributed, leading to some parts
warming much faster than average, while a few may cool, at least at first.
They underwent rapid collapse through calving of vast armadas of icebergs and undercutting of the ice margin by
warm ocean currents.»
The Gulf Stream, an
ocean current that brings
warm water from the equator toward the North Atlantic, has been credited with this observed variation in temperature for over a century.