Sentences with phrase «decline in sea ice by»

He pointed to computer models he and his colleagues studied that project a 30 percent decline in sea ice by 2050.

Not exact matches

«As krill stock started to decline dramatically with the lack of sea ice in the late 1980s, so did the survival of these young,» said Trivelpiece, whose work will be published online this week by the Proceedings of the National Academy of Sciences.

«This shift is characterized by the persistent decline in the thickness and summer extent of sea - ice cover and by a warmer, l

Climate sceptics point to increased sightings by indigenous Canadian communities, though that could be due to declines in sea ice driving the animals ashore.

An earlier study based on maps of the Antarctic ice produced by American weather satellites, by Joe Jacka and colleagues at the Australian Antarctic Division in Hobart, Tasmania, showed a similar decline in Antarctic sea ice.

«The Arctic is facing a decline in sea ice that might equal the negative record of 2012: Data collected by the CryoSat - 2 satellite reveal large amounts of thin ice that are unlikely to survive the summer.»

U.S. District Court Judge Claudia Wilken in Oakland, Calif., on April 29 ordered the Bush administration to stop dragging its feet on the fate of polar bears and decide by May 15 whether declining sea ice in the Arctic threatens their existence.

The trends revealed by the data were clear: The average albedo in the northern area of the Arctic Ocean, including open water and sea ice, is declining in all summer months (May - August).

A comprehensive review (pdf) by the US Fish and Wildlife Service concluded that shrinking sea ice is the primary cause for the decline seen in these populations, and it recently proposed listing polar bears as threatened (pdf) under the Endangered Species Act.

The findings suggest that while the response of Antarctic summer sea ice to human - caused climate change may be less dramatic than in the Arctic, sea ice cover may have declined by as much as 14 % over the last 100 years.

One study, published in Proceedings of the National Academy of Sciences in January, hinted at such a mechanism when it linked sea ice decline to apparent changes in the Arctic Oscillation during several winters preceded by large sea ice losses.

A recent paper by Francis & Hunter provides an interesting discussion about reasons for the recent decline in the Arctic sea - ice extent, based on new satellite observations.

«in Western Hudson Bay, the decline in population size, condition, and survival of young as a consequence of earlier breakup of the sea ice brought about by climate warming have all been well documented (Stirling et al., 1999; Gagnon and Gough, 2005; Regehr et al., 2005; I. Stirling and N.J. Lunn, unpub.»

Since sea surfaces rose by roughly 400 feet since the peak of the last ice age due to melting of glaciers, it is quite possible that a great many civilizations did decline or perish due to warming, and in fact perished so thoroughly that there is no trace of them.

But Mr. Kempthorne stressed that the decision was made under some duress, that oil and gas operations were not harmful to the bears and that the Endangered Species Act listing would not affect policy on greenhouse gases (even though the model shows that a continuing decline in the bears» sea - ice habitat were all driven by rising greenhouse gases).

In fact, recent research has suggested that, perhaps unintuitively, the extreme cold spell experienced by Europe this winter was linked to the sea ice decline in the ArctiIn fact, recent research has suggested that, perhaps unintuitively, the extreme cold spell experienced by Europe this winter was linked to the sea ice decline in the Arctiin the Arctic.

The fact that I can point to the majority of models not predicting this fast of a decline, and you can point out a few that say that it might have started by now and it hasn't, totally ignores the fact that either way, sea ice is diminishing and that is consistent with accumulating heat in the Earth's climate system.

In just over 30 years, sea ice volume has dropped precipitously, declining by 76 percent from 1979 (16,855 cubic kilometers) to 2011 (4,017 cubic kilometers).

«'' Climate researchers believe that the three - decade decline in Arctic sea ice can not be explained by natural causes alone.

The International Conservation Union, in its latest red list of endangered wildlife, gave polar bears threatened status in May, projecting a decline of 30 percent by midcentury from current populations, mainly due to projected losses of sea ice in a warming world.

According to research by the National Snow and Ice Data Center (NSIDC), based at the University of Colorado at Boulder, the decline in summer Arctic sea ice «is considered a strong signal of long - term climate warming&raquIce Data Center (NSIDC), based at the University of Colorado at Boulder, the decline in summer Arctic sea ice «is considered a strong signal of long - term climate warming&raquice «is considered a strong signal of long - term climate warming».

In fact, although climate models predict that Arctic sea ice will decline in response to greenhouse gas increases, the current pace of retreat at the end of the melt season is exceeding the models» forecasts by around a factor of 3 (Stroeve 2007In fact, although climate models predict that Arctic sea ice will decline in response to greenhouse gas increases, the current pace of retreat at the end of the melt season is exceeding the models» forecasts by around a factor of 3 (Stroeve 2007in response to greenhouse gas increases, the current pace of retreat at the end of the melt season is exceeding the models» forecasts by around a factor of 3 (Stroeve 2007).

They contend polar bears are already being harmed by declines in summer sea ice coverage, or will be shortly.

In 1999 Rothrock, Yu and Maykut reported in Geophysical Review Letters that the average draught of the sea ice in the Arctic region had declined by 1.3 metres (4.3 ft) compared with the 1960s and 1970In 1999 Rothrock, Yu and Maykut reported in Geophysical Review Letters that the average draught of the sea ice in the Arctic region had declined by 1.3 metres (4.3 ft) compared with the 1960s and 1970in Geophysical Review Letters that the average draught of the sea ice in the Arctic region had declined by 1.3 metres (4.3 ft) compared with the 1960s and 1970in the Arctic region had declined by 1.3 metres (4.3 ft) compared with the 1960s and 1970s.

Virtually all of the evidence generated by polar bear researchers shows that polar bears are not being harmed by declines in summer sea ice, and in some cases, they are doing very well indeed.

Although the Arctic Ocean is typically mostly covered by ice, both the thickness and extent of summer sea ice in the Arctic have shown a dramatic decline over the past thirty years, satellite measurements have found.

-- It would explain not only the current decline in Arctic sea ice, but also earlier periods of decline and recovery (which are not explained by the AGW attribution).

«If sea ice declines at the rates projected by the IPCC climate models, and continues to influence emperor penguins as it did in the second half of the 20th century in Terre Adélie, at least two - thirds of the colonies are projected to have declined by greater than 50 % from their current size by 2100,» Dr Jenouvrier said.

As the rate of sea ice decline speeds up it is starting to exceed the predictions of climate computer models which had previously suggested that by 2100 the Arctic will be ice free in summer.

Arctic sea ice declined by roughly 10 percent in the past decade, culminating in a record 2007 minimum ice cover of 1.59 million square miles.

In 1992 when breakup of sea ice was delayed by 25 days, the body condition of all ringed seals declined.

Cycles of natural variability such as the Arctic Oscillation are known to play a role in Arctic sea ice extent, but the sharp decline seen in this decade can not be explained by natural variability alone.

There is ample evidence that the recent decline in Arctic Sea Ice is primarily driven by Wind and Atmospheric Oscillations, i.e.: https://wattsupwiththat.com/2012/06/16/the-economist-provides-readers-with-erroneous-information-about-arctic-sea-ice/

Furthermore, the Arctic has warmed more than twice as fast as the global average, a phenomenon known as Arctic amplification, and stimulated by the combined increasing Arctic temperatures and rapid loss of sea ice in all seasons along with declining snow cover in the spring and early summer.

Since the satellite record began in 1979, summer sea ice cover has fallen by around 13 % per decade, with rising temperatures playing a large role in the decline.

According to AMEG, here's how climate change in the Arctic has changed weather patterns: Over the past three decades, snow cover has been reduced by 17 - 18 % per decade and sea ice is declining fast because of human - induced global warming.

Not only does this low - pressure area, or cyclone, look bigger, more intense and longer - lasting than the one from last year, the ice also seems to be in a weaker state than ever, as evidenced by the fact that 2012 trend lines on both sea ice area and sea ice extent graphs track lower than previous record years, despite weather that until recently would completely stall the decline.

Don't forget that the sea ice models these biologists use do not predict a decline in winter ice (Dec - March) and project only slight declines in spring ice (April - June) by mid-century (Amstrup et al. 2007; Durner et al. 2009; Oakley et al. 2012; Wang et al. 2012).

For more on the terrestrial foods topic, see my detailed discussion in this previous post, and this recent (March 30) ScienceNews report on yet another, largely anecdotal «polar bears resort to bird eggs because of declining sea ice» story (see photo below, based on a new paper by Prop and colleagues), which was also covered March 31 at the DailyMail («Polar bears are forced to raid seabird nests as Arctic sea ice melts — eating more than 200 eggs in two hours,» with lots of hand - wringing and sea ice hype but little mention of the fact that there are many more bears now than there were in the early 1970s around Svalbard or that the variable, cyclical, AMO (not global warming) has had the largest impact on sea ice conditions in the Barents Sesea ice» story (see photo below, based on a new paper by Prop and colleagues), which was also covered March 31 at the DailyMail («Polar bears are forced to raid seabird nests as Arctic sea ice melts — eating more than 200 eggs in two hours,» with lots of hand - wringing and sea ice hype but little mention of the fact that there are many more bears now than there were in the early 1970s around Svalbard or that the variable, cyclical, AMO (not global warming) has had the largest impact on sea ice conditions in the Barents Sesea ice melts — eating more than 200 eggs in two hours,» with lots of hand - wringing and sea ice hype but little mention of the fact that there are many more bears now than there were in the early 1970s around Svalbard or that the variable, cyclical, AMO (not global warming) has had the largest impact on sea ice conditions in the Barents Sesea ice hype but little mention of the fact that there are many more bears now than there were in the early 1970s around Svalbard or that the variable, cyclical, AMO (not global warming) has had the largest impact on sea ice conditions in the Barents Sesea ice conditions in the Barents SeaSea).

However, the pace of decline returned to near - average rates by July, and the end - of - summer minimum sea ice extent, recorded on September 10, eventually tied for second lowest with 2007 (2012 remains the lowest in the satellite time series by more than 600,000 square kilometers or 232,000 square miles).

By mid-August, the Laptev Sea was essentially ice - free, while the East Siberian and Kara sea ice also declined substantially in July and AuguSea was essentially ice - free, while the East Siberian and Kara sea ice also declined substantially in July and Augusea ice also declined substantially in July and August.

The effects of declining sea ice on marine mammals are likely to be reflected in the shifting of marine mammal populations (or smaller units) to higher latitudes by either direct movement and / or indirect shifts associated with increased mortality and decreased reproduction at lower latitudes, coincident with decreased mortality and increased reproduction at higher latitudes (Tynan and DeMaster 1997).

For example, the dramatic decline of summer sea ice in the Arctic — a loss of ice cover roughly equal to half the area of the continental United States — exacerbates global warming by reducing the reflectivity of Earth's surface and increasing the amount of heat absorbed.

As sea ice declines, it becomes thinner, with less ice build - up over multiple years, and therefore more vulnerable to further melting.15 Models that best match historical trends project northern waters that are virtually ice - free by late summer by the 2030s.25, 26,12 Within the general downward trend in sea ice, there will be time periods with both rapid ice loss and temporary recovery, 27 making it challenging to predict short - term changes in ice conditions.

Projected decline in spring snow depth on Arctic sea ice caused by progressively later autumn open ocean freeze - up this century

Arctic sea ice end - of - summer minimum area, although variable from year to year, has plummeted by more than a third in the past few decades, at a faster rate than in most models [21], with the sea ice thickness declining a factor of four faster than simulated in IPCC climate models [22].

Hezel, P. J., X. Zhang, C. M. Bitz, B. P. Kelly, and F. Massonnet, 2012: Projected decline in spring snow depth on Arctic sea ice caused by progressively later autumn open ocean freeze - up this century.

«There is no doubt that Arctic sea ice extent is trending downwards, with much of that multi-decadal decline in sea ice extent being due to human - induced climate change,» Hoerling told BuzzFeed News by email.

Ocean acidification, rising ocean temperatures, declining sea ice, and other environmental changes interact to affect the location and abundance of marine fish, including those that are commercially important, those used as food by other species, and those used for subsistence.16, 17,18,122,19,20,21 These changes have allowed some near - surface fish species such as salmon to expand their ranges northward along the Alaskan coast.124, 125,126 In addition, non-native species are invading Alaskan waters more rapidly, primarily through ships releasing ballast waters and bringing southerly species to Alaska.5, 127 These species introductions could affect marine ecosystems, including the feeding relationships of fish important to commercial and subsistence fisheries.

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Deprived Societies» (12/19/00) «HIV Epidemic Restructuring Africa's Population» (10/31/00) «Fish Farming May Overtake Cattle Ranching As a Food Source» (10/3/00) «OPEC Has World Over a Barrel Again» (9/8/00) «Climate Change Has World Skating on Thin Ice» (8/29/00) «The Rise and Fall of the Global Climate Coalition» (7/25/00) «HIV Epidemic Undermining sub-Saharan Africa» (7/18/00) «Population Growth and Hydrological Poverty» (6/21/00) «U.S. Farmers Double Cropping Corn And Wind Energy» (6/7/00) «World Kicking the Cigarette Habit» (5/10/00) «Falling Water Tables in China» (5/2/00) Top of pain Many Countries» (8/6/02) «World Turning to Bicycle for Mobility and Exercise» (7/17/02) «New York: Garbage Capital of the World» (4/17/02) «Earth's Ice Melting Faster Than Projected» (3/12/02) «World's Rangelands Deteriorating Under Mounting Pressure» (2/5/02) «World Wind Generating Capacity Jumps 31 Percent in 2001» (1/8/02) «This Year May be Second Warmest on Record» (12/18/01) «World Grain Harvest Falling Short by 54 Million Tons: Water Shortages Contributing to Shortfall» (11/21/01) «Rising Sea Level Forcing Evacuation of Island Country» (11/15/01) «Worsening Water Shortages Threaten China's Food Security» (10/4/01) «Wind Power: The Missing Link in the Bush Energy Plan» (5/31/01) «Dust Bowl Threatening China's Future» (5/23/01) «Paving the Planet: Cars and Crops Competing for Land» (2/14/01) «Obesity Epidemic Threatens Health in Exercise - Deprived Societies» (12/19/00) «HIV Epidemic Restructuring Africa's Population» (10/31/00) «Fish Farming May Overtake Cattle Ranching As a Food Source» (10/3/00) «OPEC Has World Over a Barrel Again» (9/8/00) «Climate Change Has World Skating on Thin Ice» (8/29/00) «The Rise and Fall of the Global Climate Coalition» (7/25/00) «HIV Epidemic Undermining sub-Saharan Africa» (7/18/00) «Population Growth and Hydrological Poverty» (6/21/00) «U.S. Farmers Double Cropping Corn And Wind Energy» (6/7/00) «World Kicking the Cigarette Habit» (5/10/00) «Falling Water Tables in China» (5/2/00) Top of pain 2001» (1/8/02) «This Year May be Second Warmest on Record» (12/18/01) «World Grain Harvest Falling Short by 54 Million Tons: Water Shortages Contributing to Shortfall» (11/21/01) «Rising Sea Level Forcing Evacuation of Island Country» (11/15/01) «Worsening Water Shortages Threaten China's Food Security» (10/4/01) «Wind Power: The Missing Link in the Bush Energy Plan» (5/31/01) «Dust Bowl Threatening China's Future» (5/23/01) «Paving the Planet: Cars and Crops Competing for Land» (2/14/01) «Obesity Epidemic Threatens Health in Exercise - Deprived Societies» (12/19/00) «HIV Epidemic Restructuring Africa's Population» (10/31/00) «Fish Farming May Overtake Cattle Ranching As a Food Source» (10/3/00) «OPEC Has World Over a Barrel Again» (9/8/00) «Climate Change Has World Skating on Thin Ice» (8/29/00) «The Rise and Fall of the Global Climate Coalition» (7/25/00) «HIV Epidemic Undermining sub-Saharan Africa» (7/18/00) «Population Growth and Hydrological Poverty» (6/21/00) «U.S. Farmers Double Cropping Corn And Wind Energy» (6/7/00) «World Kicking the Cigarette Habit» (5/10/00) «Falling Water Tables in China» (5/2/00) Top of pain the Bush Energy Plan» (5/31/01) «Dust Bowl Threatening China's Future» (5/23/01) «Paving the Planet: Cars and Crops Competing for Land» (2/14/01) «Obesity Epidemic Threatens Health in Exercise - Deprived Societies» (12/19/00) «HIV Epidemic Restructuring Africa's Population» (10/31/00) «Fish Farming May Overtake Cattle Ranching As a Food Source» (10/3/00) «OPEC Has World Over a Barrel Again» (9/8/00) «Climate Change Has World Skating on Thin Ice» (8/29/00) «The Rise and Fall of the Global Climate Coalition» (7/25/00) «HIV Epidemic Undermining sub-Saharan Africa» (7/18/00) «Population Growth and Hydrological Poverty» (6/21/00) «U.S. Farmers Double Cropping Corn And Wind Energy» (6/7/00) «World Kicking the Cigarette Habit» (5/10/00) «Falling Water Tables in China» (5/2/00) Top of pain Exercise - Deprived Societies» (12/19/00) «HIV Epidemic Restructuring Africa's Population» (10/31/00) «Fish Farming May Overtake Cattle Ranching As a Food Source» (10/3/00) «OPEC Has World Over a Barrel Again» (9/8/00) «Climate Change Has World Skating on Thin Ice» (8/29/00) «The Rise and Fall of the Global Climate Coalition» (7/25/00) «HIV Epidemic Undermining sub-Saharan Africa» (7/18/00) «Population Growth and Hydrological Poverty» (6/21/00) «U.S. Farmers Double Cropping Corn And Wind Energy» (6/7/00) «World Kicking the Cigarette Habit» (5/10/00) «Falling Water Tables in China» (5/2/00) Top of pain China» (5/2/00) Top of page