Sea-level rise from polar ice melt finally quantified
Posted in the Global Warming Forum
Since: Apr 08
"the green troll"
#1 Nov 29, 2012
Melting of polar ice sheets has added 11mm to global sea levels over the past two decades, according to the most definitive assessment so far.
More than 20 polar research teams have combined forces to produce estimates of the state of the ice in Greenland and Antarctica in a paper in Science.
Until now different measurement means have produced a wide range of estimates with large uncertainties.
But sea-level rise is now among the most pressing questions of our time.
Polar ice has a tremendous capacity to cause massive rises - with huge potential impacts on coastal cities and communities around the world.
But the remoteness and sheer size of the ice sheets mean accurate measurements are a serious challenge even for satellites which have to distinguish snow from ice, and the rise of the land from the shrinking of the ice.
The new estimate shows that polar melting contributed about one-fifth of the overall global sea level rise since 1992; other factors include warming that causes the seawater to expand.
#2 Nov 29, 2012
Lots of the total Greenland & especially Antarctic Land Ice Melts have been reduced by increased snow quantities due to AGW predicted warming Oceans placing more water vapor in the atmosphere. Moving on-land, the vapors cool to freezing & lower temperatures & fall as snow.
Of course, initial sea-level is slowed. As AGW advances, such a balancing act will be upset & sea-level rise will increase.
Since: Aug 08
#3 Nov 29, 2012
Arctic sea ice extent is 9,800,000 km2 (November 27, 2012)continuing & increasing losses greater than the size of New Jersey, despite present temperatures on Arctic Canadian islands, to as low as -35degC. with average temperatures above the 80th parallel continuing to rise sharply, this time to -16 degC! The sun has been unseen from the North Pole for 9+ weeks!
Arctic Ocean warmth is & will continue to keep Arctic sea ice thinner through the coming winter & even spring. As of November, Arctic sea ice VOLUME is ~21% lower than any other year Arctic sea ice yearly VOLUME. Average Arctic sea ice VOLUME during November for the period 1980-89, was ~18 thousand km3. Present November 2012 sea ice VOLUME is 6200 km3. The Arctic sea ice loss has been an uncontrolled plummet, desired by unscientific AGW deniers, who mostly have no or little mathematical or science background.
Presently, Arctic sea ice extent is at 9,927,031 km2 (November 28, 2012), yo-yoing upward by Mississippi-area size. Present temperatures on Arctic Canadian islands are as low as -43degC! Warmth pushed through Siberia, may have spilled into the area's strong heat above the 80th parallel.
The period of greatest average area Arctic sea icing increases per day(like Kansas-sized) is over.
Finally, the Arctic Ice Pack has attached solidly to the north coast of Alaska & now on the west coast. Baffin Bay is sea icing. Due to solar heats absorbed into the shallow waters of Hudson Bay, the Bay has resisted icing. However, Bay temperatures, now as low as -41 degC, due to cold spillage from the North Pole, finally cause strong icing on its north & west border.
The vast open Arctic waters north of Siberia have been covered by Arctic Ice Pack. The huge sea ice floes that strongly developed in the vast clear waters north of Siberia(due to broad double digit minus Siberian temps spilled from North Pole's 7+ weeks of darkness & vortex mixing breaking down stratified solar heated waters?), have done their job AND connected the Ice Pack to the entire Siberian coastline, truly a remarkable past development!
Chief Joseph Land was partially encircled by Arctic Ice Pack, very wide to the east, due to a continuing 5-day vortex, partially under the Ice Pack AND circling the islands that has moved cold Arctic sea water southward to the islands. The vortex quickly moved north completely under the Ice Pack, but has returned to the islands! Svalbard, in winter darkness 24/7, is still clear of the Ice Pack!!!!!!!!!!
A detail noted well over a month ago, is a raggy taggy developing edge along a part of the semi-circle Ice Pack, possibly NOT coincidental with the HUNDREDS OF THOUSANDS (plus?) OF SQUARE KILOMETERS, of waters north of Alaska & Siberia that are VASTLY CLEAR. Might the raggy taggy edge indicate huge turbulence & currents in this largest(ever?) ice free, & resulting southerly-directed heat stratified Arctic waters? I wonder if there might develop more raggy taggy edging, enough to form a swirl pattern?
A month+ ago, noted near the raggy taggy Ice Pack, developed 3 tiny pixel ice floes(arced?), separated from the Arctic ice pack toward southerly directions. A day later, the number of ice floes increased to 8 & indeed they formed an ARC. Pretty sure they represent a large scale vortex in open Arctic water!
Further data, showed that the vortex was true!
Downwelling solar heats, in unusual clear Arctic Ocean & seas, normally sea ice covered in decades past, which have strongly transported extra solar energy to continental shelf, sea & Ocean depths for 4 months, is over. The sun has been unseen from the North Pole for 9+ weeks & presently anywhere above the 69th parallel, now shrouding the Arctic with darkness for a good portion of the year! The sun is under 3 arcdeg above its farthest position to the south, due to the tilt of the Earth & present orbital position, with average temperatures above the 80th parallel jumping to -16 degC.
#5 Nov 30, 2012
Ice melting makes more beech front property.
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