Sentences with phrase «ice decline since»

The September rate of sea ice decline since 1979 is now approximately 10 percent per decade, or 72,000 square kilometers (28,000 square miles) per year (see Figure 3).

However, there is also an emerging signal of overall Arctic sea ice decline since 1979 in both winter and summer that is not directly attributable to a trend in the overlying atmospheric circulation.»

They found that the circulation of air — and its temperature and humidity — could contribute 60 % of the polar sea ice decline since 1979.

It is arguably one of the most advanced of the seven in its impacts, with a 2011 GRL report putting its warming effect as equivalent to around 30 % of atmospheric anthro - CO2, and the recent report putting albedo loss from arctic sea - ice decline since»79 as providing a forcing equivalent on average to that from 25 % of the anthro - CO2 levels during the period.

Mark A.J. Curran, et al., «Ice Core Evidence for Antarctic Sea Ice Decline Since the 1950s,» Science, vol.

Not exact matches

Aerial mapping of Kilimanjaro's summit in February 2000 revealed a 33 % loss of ice since the last map in 1989 and an 82 % decline since 1912, says geologist Lonnie Thompson of Ohio State University's Byrd Polar Research Center in Columbus.

Schweitzer decline to discuss DNA because she does not work with it, but DNA is far less stable than proteins so is usually broken into fragments, even in tissue that has been frozen since the ice age.

Since that year the minimum ice cover has declined rapidly, dwindling to an all - time record low of 3.4 million square kilometers on September 16, 2012.

The volume of ice divergence has doubled since 2000 due to a more mobile ice cover as multiyear ice has declined, which can explain the drastic ice reduction in the Arctic Ocean in recent years.

Since 1979, average Arctic sea ice has declined about 7.5 percent per decade.

The sea ice decline has accelerated since 1996.

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

With the Arctic warming twice as fast compared to the rest of the world, the region's summer sea ice has declined by about 30 percent since 1979.

Overall, though, Arctic sea ice has seen a clear decline since satellites first began monitoring it in 1979.

The minimum Arctic sea ice has declined by a little over half since its maximum extent of the past three decades.

We find a consistent decreasing trend in Arctic Ocean sea ice thickness since 1979, and a steady decline in the Eastern Arctic Ocean over the full 40 - year period of comparison that accelerated after 1980, but the predictions of Western Arctic Ocean sea ice thickness between 1962 and 1980 differ substantially.

I sent some questions to some of the authors of the new study showing how much the thickness and total volume of Arctic sea ice have declined since 2003.

Global mean temperature since the last ice age has oscillated quasi-periodically between about + / - 1 % of its mean; over that time, the mean has slightly declined, as have the maxima and minima of the excursions.

Although the sea ice extent has held up since 2007, the thickness has declined; but the extent can not continue to hold up indefinitely while the thickness continues to decline.

Analysis of the new record shows that since a peak in 1980, sea ice thickness has declined 53 percent.

The argument at its simplest is that since there are individual model runs in the CCSM4 ensemble that are just about as bad as our current reality, we can't rule out the chance that reality will return to the CCSM4 ensemble line — i.e. the decline will slow, and the Arctic will be summer ice - free in «only» 2040 - 2050 or so.

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 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 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.

So sea ice is down 39 % since the 1970s and is projected to decline another 30 % by 2050?

The sea ice grows and recedes with the seasons every year and has been on the decline since spring... and the overall trend over time is definitely downward.

Sea ice in the Parry Channel route has shown a sharp decline since the middle of July, but the channel is still not entirely ice free.

Chip — As far as I can tell from Recent NSIDC Data, the models appear to have overestimated rather than underestimated sea ice decline, since recent September value exceed 4 million square kilometers.

Ice bridge at Kane Basin, Nares Strait March 26 2011 Ice volume The decline in ice volume since 1979 is dramatically illustrated by this PIOMAS graIce bridge at Kane Basin, Nares Strait March 26 2011 Ice volume The decline in ice volume since 1979 is dramatically illustrated by this PIOMAS graIce volume The decline in ice volume since 1979 is dramatically illustrated by this PIOMAS graice volume since 1979 is dramatically illustrated by this PIOMAS graph.

The movie displays the decline of arctic sea ice since 1979.

Most of the ice reduction in the Northern Hemisphere has occurred since 1970, and the decline continues at a rapid pace.

Josh — I do not dispute that there has been a decline in Arctic ice in the last 20 odd years, but the second lowest on [satellite] record is only since 1979.

Shown below is the declining sea ice trend for the month of January since satellite measurements began, in 1979.

In contrast, the actual science shows something quite different: though summer sea ice since 2007 has declined to levels not predicted until 2040 - 2070, there has been virtually no negative impact on polar bear health or survival, a result no one predicted back in 2005.

[1] Arctic sea ice has been in decline since at least the 1970s due to climate change, and research shows the thinning is accelerating.

They found that between 5 % and 30 % of the Arctic sea ice decline from 1979 to 2010 could be attributed to the natural cycles of the Atlantic Multidecadal Oscillation (AMO) and Arctic Oscillation (AO), and even less can be attributed to natural cycles since 1953, since these natural cycles tend to average out over longer timeframes (as Vinnikov also found).

And while temperature should decrease the total amount of carbon in the upper layer of the oceans, we see an increase in carbon (and a decrease in 13C / 12C ratio)- Ice cores, tree carbon and coralline sponges all give small 13C / 12C variations over the Holocene, but all show a steady and ever faster decline since about 1850.

The figure shows a clear and steady decline in Arctic sea ice since the late 1970s, with lighter darker colours (earlier years) at the top and lighter colors (more recent years) much lower.

That winter was also to be the coldest in the UK since 1978/79, when climate scientists were still scaring us with stories about imminent global cooling and satellites were only just starting to measure the temperature of the lower troposphere and the beginnings of the «catastrophic» decline in Arctic sea - ice.

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.

The data gleaned from those records, called the Hadley data set, show that Arctic sea ice has declined since at least the mid-1950s.

For example, as summer ice cover declines (as it has since the 70s), has the summer evaporation of water from the surface increased?

Miller assumes (reasonably enough) that the moss was engulfed by ice cap expansion — the expansion indicating a decline in temperature — and that the moss has not been subsequently exposed (since it degrades relatively rapidly upon exposure).

Since that report was written, steeper - than - expected declines have led to suggestions that summer sea ice might be largely gone by 2030, and some think much sooner.

Why does the GRACE satellite data show a rather fast decline in ice mass for Antarctica since 2002?

And the decline has accelerated, becoming far more dramatic, since about the year 2000, leading to annual average sea ice loss of around three million square kilometers.

If this is correct, then the fact that the sea ice extent has been «declining since records began» (in 1979) doesn't mean that recent trends are unusual.

At any rate, since the Antarctic sea ice extent doesn't seem to be declining, the public concern over sea ice seems to be confined to the Arctic.

Not only that, but if rising CO2 levels were responsible for the decline of sea ice and implied effects on polar bears since 1979 (when CO2 levels were around 340 ppm), why has spring ice extent been so variable since 1989 (when the first big decline occurred) but so little changed overall since then?

The total failure of polar bear numbers to crash as predicted in response to the abrupt decline in summer sea ice in 2007 and persistent low summer sea ice levels since then (Crockford 2017), is vindication for Mitch Taylor.

But the Bering Sea SST anomalies have also been decreasing since 2004, which also implies the Bering Sea would have had less contribution to the Arctic sea ice decline in 2007 and 2008 than it did in 2004.

Sea levels are rising (ask the Mayor of Miami who has spent tax monies to raise road levels), we've had 15 of the hottest years eve measured, more precipitation is coming down in heavy doses (think Houston), we're seeing more floods and drought than ever before (consistent with predictions), the oceans are measuring warmer, lake ice in North America is thawing sooner (where it happens in northern states and Canada), most glaciers are shrinking, early spring snowpacks out west have declined since the 1950's, growing seasons are longer throughout the plains, bird wintering ranges have moved north, leaf and bloom dates recorded by Thoreau in Walden have shifted in that area, insect populations that used to have one egg - larva - adult cycle in the summer now have two, the list goes on and on.