Sentences with phrase «declining sea ice cover»

Models can help scientists understand what effects higher temperatures will have, for instance, or whether declining sea ice cover on the Arctic Ocean will add to climate change.

For example, the Pacific - Arctic Gateway through the Bering Strait would be an ideal monitoring area because of increased heat and freshwater flow, increased marine mammal migration, declining sea ice cover, increased oil and gas exploration, exploratory fisheries in the last decade, and flow of pollutants, especially persistent organic pollutants largely from Asia.

The empirical evidence from the past two decades reveals that declining sea ice cover and thickness have been great enough to enhance Arctic warming during most of the year.

Not exact matches

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

«One societally relevant implication is that more storminess probably means more erosion of Arctic coastlines, especially in tandem with declines in buffering sea ice cover and increases in thawing coastal permafrost,» concluded Dr. Vavrus.

«Because these plants are photosynthetic, it's not surprising to find that as the amount of sea ice cover declined, the amount of [photosynthesis] increased,» says biological oceanographer Kevin Arrigo of Stanford University's School of Earth Sciences, who led an effort to use the MODIS (Moderate Resolution Imaging Spectroradiometer) devices on NASA's Terra and Aqua satellites to determine changes in phytoplankton growth.

In September 2007 less sea ice covered the Arctic than at any point since the U.S. government began keeping records of its decline.

Krill require a cover of sea ice to spawn and hide from predators, and recent Antarctic krill declines have been linked to the retreating ice.

Arctic warming has caused a rapid decline in sea ice cover during the past decade that could seriously affect everything from Arctic ecosystems to shipping and oil drilling.

Researchers also tracked sea ice cover in the Arctic over these two periods and found that the ice declined substantially from the first to the second period.

Projected 21st Century Decline Snow Cover Overlying the Arctic Sea Ice and Implications for the Sea Ice and Arctic Climate in CESM / CCSM Benjamin Blazey

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.

The data (back to 1979) suggest that snow cover has not been declining at the rate of sea ice and this study could be an explanation of that.

Probably not from Arctic sea ice cover reduction either, as the ice cover in the late 60s, begin 70s doesn't show a decline (as far as reliable in the pre-satellite era).

Furthermore, decline in snow cover and sea ice will tend to amplify regional warming through snow and ice - albedo feedback effects (see Glossary and Chapter 9).

Furthermore, Prof. Slingo rejected data which shows a decline in Arctic sea ice volume of 75 % and also rejected the possibility that further decreases may cause an immediate collapse of ice cover.

All climate models tell us that it is the Arctic sea ice cover that declines first, and that Antarctic ice extent falls only later, and may even (as observed) temporarily increase in response to changing patterns of atmospheric circulation.

Marc Kaufman, «Decline in Winter Arctic Ice Linked to Greenhouse Gases,» Washington Post, 14 September 2006; Joséfino C. Comiso, «Abrupt Decline in the Arctic Winter Sea Ice Cover,» Geophysical Research Letters, vol.

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.

Besides these thousands of thermometer readings from weather stations around the world, there are many other clear indicators of global warming such as rising ocean temperatures, sea level, and atmospheric humidity, and declining snow cover, glacier mass, and sea ice.

The majority of the winter warming is associated with changes in sea ice cover even though the sea ice declines at this time of the year are relatively small.

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.

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.

The evidence for rapid climate change is compelling: Sea level rise, Global temperature rise, Warming oceans, Shrinking ice sheets, Declining Arctic sea ice, Glacial retreat, Extreme events, Ocean acidification, Decreased snow cover http://climate.nasa.gov/evidence/ It's changing «rapidly&raquSea level rise, Global temperature rise, Warming oceans, Shrinking ice sheets, Declining Arctic sea ice, Glacial retreat, Extreme events, Ocean acidification, Decreased snow cover http://climate.nasa.gov/evidence/ It's changing «rapidly&raqusea ice, Glacial retreat, Extreme events, Ocean acidification, Decreased snow cover http://climate.nasa.gov/evidence/ It's changing «rapidly».

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).

«leading to a dramatic decline in the amount of sea ice that covers the region each winter.»

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.

The Arctic is warming much faster than most of the planet, leading to a dramatic decline in the amount of sea ice that covers the region each winter.

Anomalous cyclonic atmospheric circulation throughout the Arctic Basin during June has continued to precondition sea ice, making the ice cover vulnerable to a precipitous drop in sea ice extent; however the persistence of the June cyclonic circulation (and cloudiness associated with the surface lows) has induced divergence within the sea ice cover, and has delayed the onset of the rapid sea ice extent decline typically observed in June.

Polar bears are one of the most sensitive Arctic marine mammals to climate warming because they spend most of their lives on sea ice.35 Declining sea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionsea ice.35 Declining sea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionsea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionsea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionsea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea regionSea region.45

[Gallery: Vanishing Glaciers] «The average thickness of the Arctic sea ice cover is declining because it is rapidly losing its thick component, the multi-year ice.

This report discusses our current understanding of the mechanisms that link declines in Arctic sea ice cover, loss of high - latitude snow cover, changes in Arctic - region energy fluxes, atmospheric circulation patterns, and the occurrence of extreme weather events; possible implications of more severe loss of summer Arctic sea ice upon weather patterns at lower latitudes; major gaps in our understanding, and observational and / or modeling efforts that are needed to fill those gaps; and current opportunities and limitations for using Arctic sea ice predictions to assess the risk of temperature / precipitation anomalies and extreme weather events over northern continents.

http://www.sciencedirect.com/science/article/pii/S0959378012001215 They showed a low bias in IPCC evaluations for sea level rise, CO2 emissions, sea ice decline, permafrost melt and carbon feedbacks, rainfall intensity and northern hemisphere snow cover.

The study adds to the evidence showing that the free - fall in summer sea ice extent and even sharper decline in spring snow cover in the Northern Hemisphere is reverberating throughout the atmosphere, making extreme events more likely to occur.

The new study, along with other previously published research, showed that the decline in sea ice and snow cover has slowed the west - to - easterly component of the jet stream, thereby enhancing the north - to - south waviness of the jet, which leads to the creation of more stagnant or «blocked» weather patterns.

The rapidly declining summer Arctic sea - ice cover might already have passed a tipping point, although this is hard to identify due to high year - to - year variability.

In addition, the decline of Arctic Ocean sea ice cover led to increased warmth, and therefore buoyancy, of water that flowed into the North Atlantic, Sévellec et al. (2017).

Within this uncertainty range, this reconstruction suggests that the pronounced decline in summer Arctic sea ice cover that began in the late twentieth century is unprecedented in both magnitude and duration when compared with the range of variability of the previous roughly 1,450 years.

How much it has grown is not stated in the paper: «Observational determination of albedo decrease caused by vanishing Arctic sea ice» http://eisenman.ucsd.edu/publications/Pistone-Eisenman-Ramanathan-2014.pdf but it seems very clear that Arctic sea - ice loss is in accelerating decline towards zero in the coming decades, meaning that this forcing will rise very substantially along with those from land - ice and snow cover decline.

The President made several incorrect statements, including suggesting that global temperatures are not increasing, and sea ice cover is not declining.

The new evidence — including satellite data showing that the average multiyear wintertime sea ice cover in the Arctic in 2005 and 2006 was nine feet thick, a significant decline from the 1980s — contradicts data cited in widely circulated reports by Washington Post columnist George F. Will that sea ice in the Arctic has not significantly declined since 1979.

Barents Sea numbers have probably increased since 2005 and have definitely not declined despite much less sea ice covSea numbers have probably increased since 2005 and have definitely not declined despite much less sea ice covsea ice cover.