Sentences with phrase «ice changes occur»

Ice sheets can take centuries to millennia to melt or form, whereas sea ice changes occur much more rapidly (as we're currently seeing in the Arctic).

Not exact matches

I believe that climate change is occurring — the reduction in the size of global ice caps is hard to ignore.

The new study «demonstrates that climate change can remobilize POPs stored in water, snow, ice and presumably soils — and that this process is already occurring in the Arctic region,» he wrote in an essay accompanying the new study.

In a presentation Thursday at the Seismology Society of America's annual meeting in Anchorage, West showed that long - ignored data within the state's earthquake records faithfully capture dynamic change occurring above ground: ice breaking off of glaciers and falling into water, the phenomenon known as calving.

A McGill - led international research team has now completed the first global study of changes that occurred in a crucial component of ocean chemistry, the nitrogen cycle, at the end of the last ice age.

«These findings add to mounting evidence suggesting that there are sweet spots or «windows of opportunity» within climate space where so - called boundary conditions, such as the level of atmospheric CO2 or the size of continental ice sheets, make abrupt change more likely to occur.

They also determined that CNFs could increase shelf life of ice cream, or at least decrease its sensitivity to temperature changes that occur when moved to and from the freezer.

When the Intergovernmental Panel on Climate Change (IPCC)-- an organization under the auspices of the United Nations that periodically evaluates the effects of climate change — tried to determine the ice loss from Antarctica for its Fourth Assessment Report released in 2007, discussion by the authors largely occurred behind closed doors, said Oppenheimer, who has been long involved with the IPCC and served as an author of its Assessment ReChange (IPCC)-- an organization under the auspices of the United Nations that periodically evaluates the effects of climate change — tried to determine the ice loss from Antarctica for its Fourth Assessment Report released in 2007, discussion by the authors largely occurred behind closed doors, said Oppenheimer, who has been long involved with the IPCC and served as an author of its Assessment Rechange — tried to determine the ice loss from Antarctica for its Fourth Assessment Report released in 2007, discussion by the authors largely occurred behind closed doors, said Oppenheimer, who has been long involved with the IPCC and served as an author of its Assessment Reports.

Beginning about 1850, industrial emissions resulted in a sevenfold increase in ice - core BC concentrations, with most change occurring in winter.

If proxy data can confirm that sea ice was indeed the major player in past abrupt climate - change events, it seems less likely that such dramatic abrupt changes will occur due to global warming, when extensive sea - ice cover will not be present.

He told the Climate News Network: «While the sparse existing observations do not indicate warmer water inflow towards the Wilkes ice sheet margin at present, there is no reason why changes similar to those in West Antarctica could not also occur here.»

While it is often occurring in remote regions, ongoing change with the cryosphere has impacts on people all around the world: sea level rise affects coastlines globally, billions of people rely on water from snowpack, and the diminishing sea ice that covers the Arctic Ocean plays a significant role in Earth's climate and weather patterns.

But could such a change, big enough to cause an ice age, occur?

«In order to know how Greenland's ice may change in the future, we need to focus on the areas where the changes have occurred over both short and long time periods.»

If proxy data can confirm that sea ice was indeed the major player in past abrupt climate - change events, it seems less likely that such dramatic abrupt changes will occur due to global warming, when extensive sea - ice cover will not be present.

... Polar amplification explains in part why Greenland Ice Sheet and the West Antarctic Ice Sheet appear to be highly sensitive to relatively small increases in CO2 concentration and global mean temperature... Polar amplification occurs if the magnitude of zonally averaged surface temperature change at high latitudes exceeds the globally averaged temperature change, in response to climate forcings and on time scales greater than the annual cycle.

More ground turns from white reflective snow to black, heat absorbant dirt.The same effect occurs as sea ice is lost.The corals blanch, and, as I stated last year on this site, the shutdown of the north Atlantic current will occur, since the salinity level studies I spoke of last year, off Greenland, continue to show that the upwelling mechanisms driving the North Atlanic current are in severe jeapordy, because the change in salinity levels effects the driver of the current, the upwelling and downwelling of different salinity levels off Greenland.

1993 Greenland ice cores suggest that great climate changes (at least on a regional scale) can occur in the space of a single decade.

Nature does not remain the same with slow and immediate changes occurring, from ice ages to volcanic eruptions.

Here's my uneducated question — while I respect Gavin's comments about not abusing the science, it seems to me that many measurable indicators of climate change are (to the extent I can tell) occurring / progressing / worsening faster than predicted by most models, whether we're talking about atmospheric CO2 levels, arctic ice melting, glacial retreat, etc..

In the short video above, Dr. Alley explains how some patterns in the changes that occur during Earth's ice ages and warm intervals (like the last 11,000 years) prove that greenhouse gases exert a warming effect.

The Antarctic ice increase is occurring in a limited region near the Ross Sea, and is related to the ozone hole through a fairly complicated change in atmospheric dynamics.

The largest climate mode shift over this time interval, occurring ~ 950,000 years before the present (the mid-Pleistocene transition), has previously been attributed to changes in the pattern and frequency of ice sheets.

In their latest Science paper submittal Jim Hansen, et al. argue that we must reduce atmospheric CO2 to below 350 ppm because so - called «slow feedbacks» such as changes in ice sheet albedo are occurring much faster than expected.

It occurred to me that there must be similar flows into all the oceans of the world and particularly from melting ice - caps where temperature changes may have exposed previously blocked outlets.

Can someone confirm that my reasoning is correct, and give me an idea of when the sudden change in 2008 ice surface area is likely to occur?

Ricarda Winkelmann et al. modeled the response of the Antarctic ice sheet to a wide range of future carbon emissions scenarios over the long - term (previous simulations have mainly looked at changes that might occur on a shorter timescale).

Might relate to opening a super cold bottle of pop, or the glacial melt and refreeze that occurs almost instantly as shifts change the pressure being exerted on super cold ice that is almost water.

No detailed assessment of the speed of change involved seems to have been made within the literature (though it should be possible to make such assessments from the ice core record), but the short duration of these events at least suggests changes that took only a few decades or less to occur.

Recent evidence from ice - core drilling in Greenland indicates that similar fluctuations also occurred during the previous interglacial period, possibly due to rapid changes in ocean circulation.

But other changes are occurring such as the melting of glaciers and ice packs in the Arctic and the acidification of the oceans.

Likewise headlines such as ««U.S. Scientist Sees New Ice Age Coming,» «Washington Post», July 9, 1971 (the scientist in question being a colleague of Dr. Hansen) or Holdren in 1971 predicting an ice age (http://www.zombietime.com/zomblog/?p=873), (although, to be fair, in the same book he simultaneously predicted global warming), or books from 1977 quoting the CIA: «The studies conclude that the world is entering a difficult period during which major climate change (further cooling) is likely to occur.&raqIce Age Coming,» «Washington Post», July 9, 1971 (the scientist in question being a colleague of Dr. Hansen) or Holdren in 1971 predicting an ice age (http://www.zombietime.com/zomblog/?p=873), (although, to be fair, in the same book he simultaneously predicted global warming), or books from 1977 quoting the CIA: «The studies conclude that the world is entering a difficult period during which major climate change (further cooling) is likely to occur.&raqice age (http://www.zombietime.com/zomblog/?p=873), (although, to be fair, in the same book he simultaneously predicted global warming), or books from 1977 quoting the CIA: «The studies conclude that the world is entering a difficult period during which major climate change (further cooling) is likely to occur.»

However, substantial ice sheet changes that occurred during the last hundreds to few thousands of years remain poorly quantified and are not included in our model.

It would require a much stronger relationship of temperature driving CO2 than occurred during the ice age — interglacial oscillations (and it is also important to remember that those changes occurred over much longer timescales too... which is the presumed reason why there is a several hundred year lag time between temperatures starting to rise or fall and CO2 starting to rise or fall).

GOAL 1: Examine the historical evolution of the arctic ice - ocean system from 1948 to 2003 to understand the large - scale changes that have occurred in sea ice and the upper Arctic Ocean over this time period.

Abstract — 2008 Climate and wildfires in the North American boreal forest... Climate controls the area burned through changing the dynamics of large - scale teleconnection patterns (Pacific Decadal Oscillation / El Niño Southern Oscillation and Arctic Oscillation, PDO / ENSO and AO) that control the frequency of blocking highs over the continent at different time scales......... Since the end of the Little Ice Age, the climate has been unusually moist and variable: large fire years have occurred in unusual years, fire frequency has decreased and fire — climate relationships have occurred at interannual to decadal time scales...... http://rstb.royalsocietypublishing.org/content/363/1501/2315.short ----------------------

But even if you choose to doubt them, it is really the first seven that, combined, point to human activities as the only explanation of rising global temperatures since the Industrial Revolution, and the subsequent climate changes (such as ice melt and sea level rise) that have occurred due to this global warming.

Shifting currents, increased freshwater input from melting sea ice and glaciers, and changes in upper and lower sea - level circulation patterns are already occurring, and they'll progress rapidly if anthropogenic greenhouse gas emission continues under a business - as - usual scenario.

Glacial cycles (ice ages) are set in motion by (1) periodic wobbles in the tilt of the Earth's rotation, (2) changes in the tilt of its axis, and (3) the shape of its orbit occurring over tens of thousands of years.

Changes occurring in marine terminating outlet glaciers of the Greenland Ice Sheet and ice shelves fringing the Antarctic Peninsula have altered our sense of the possible rate of response of large ice sheet - ice shelf systeIce Sheet and ice shelves fringing the Antarctic Peninsula have altered our sense of the possible rate of response of large ice sheet - ice shelf systeice shelves fringing the Antarctic Peninsula have altered our sense of the possible rate of response of large ice sheet - ice shelf systeice sheet - ice shelf systeice shelf systems.

There is concern in the scientific community that the temperature change from now to the end of the century will be roughly the same as the difference between now and the last Ice Age, which occurred 10,000 years ago, resulting in dramatic changes in temperature, weather patterns, water tables, land and biodiversity.

Changes to polar ice and glaciers and rainfall regimes have already occurred, the scientists said.

The effects of ice melt on ocean circulation were not included in the latest assessment by the United Nations» Intergovernmental Panel on Climate Change (IPCC), meaning Hansen's predictions would occur much earlier and be less gradual than envisioned in the consensus reports of the IPCC.

Abrupt and severe temperature shifts have occurred on occasion in the past, typically separated by hundreds of years or more, but shifts of this magnitude that are global in extent have almost always occurred during glacial eras, when the extent of snow and ice allowed for great changes in feedback in response to only modest signals.

During the first two decades of the twentieth century, «heavy sea ice was quite common along the coasts of Iceland, but in the 1920s a drastic change occurred.

Note also, having aerosols a cooling means that your relationship between CO2 and temperature in the ice - cores is blown away; dust levels increase by three orders of magnitude going from warming to cooling, and dust changes occur before temperature changes, which occur before CO2 changes.

Sea level equivalent (SLE)- The change in global average sea level that would occur if a given amount of water or ice were added to or removed from the oceans.

Losing a massive, state - sized ice block may leave the remaining shelf vulnerable to further climate change - related conditions and its collapse will occur earlier, O'Leary explained.

By scaling six CMIP3 models to recent observed September sea ice changes, a nearly ice - free Arctic in September is projected to occur by 2037...

Siders was among a panel of researchers who discussed the science behind the declining sea ice, the suite of changes occurring in the Arctic and public perception of it.