Antarctica is cooling/gaining ice
The skeptic argument...The amount of ice surrounding Antarctica is now at the highest level ever measured for this time of the year, since satellites first began to monitor it almost 30 years ago. All of the IPCC’s models of Antarctica in the twenty-first century forecast a gain in ice, as a warmer surrounding ocean evaporates more water, which subsequently falls in the form of snow when it hits the continent. Other studies, such as Peter Doran’s in Nature in 2003, show actual cooling in recent decades. It’s simply too cold for rain in Antarctica, and it’ll stay that way for a very long time. The bottom line is that there is more ice than ever surrounding Antarctica (source: Patrick Michaels).
What the science says...
Antarctic cooling is a uniquely regional phenomenon. In fact, the case of Antartica cooling is a great case study on how the media and global warming skeptics seize upon a study and interpret it inappropriately. The original study observed regional cooling in east Antarctica. The hole in the ozone layer above the South Pole causes cooling in the stratosphere. This increased circular winds around the continent preventing warmer air from reaching east Antarctica and the Antarctic plateau. The flip side of this is the Antarctic Peninsula has "experienced some of the fastest warming on Earth, nearly 3°C over the last half-century".
While East Antartica is gaining ice due to increased precipitation, Antartica is overall losing ice. This is mostly due to melting in West Antarctica which recently featured the largest melting observed by satellites in the last 30 years. As well as melting, Antartic glaciers are accelerating further adding to sea level rise.
Further readingTamino compares and analyses the long term trends in sea ice data from the Northern and Southern Hemisphere in Sea Ice, North and South, Then and Now.
Comments1.Quietman at 10:38 AM on 12 March, 2008
I suppose that the volcanic activity that they discovered recently has nothing to do with this?
2.Wondering Aloud at 01:36 AM on 1 April, 2008
Another one of those issues the more you investigate the less convincing it becomes.
3.Quietman at 12:02 PM on 22 April, 2008
"Computer models have predicted that energetic particles hitting the top of the atmosphere in polar regions may change temperatures by stimulating the production of nitrous oxides (NOx)."
"NOx destroys ozone in catalytic reaction cycles; and when you change ozone in the stratosphere, that... can then feed down to surface temperatures."
From an article by BBC News "More doubt on cosmic climate link By Richard Black, Environment correspondent, BBC News website, Vienna" under the subhead Local change
[ Response: I did see that article earlier today. The section on Antarctica is interesting although the phenomena they're describing seems to be regional and shows no long term trends - it's a localised, short term effect. However, what did get my attention was the section on cosmic rays as I've actually been preparing a post on that very topic - cloud cover during Forbush events. This new study covers the same material using different data so I contacted the author this morning hoping to get more info. More on this soon, I hope. ]
4.Quietman at 06:26 AM on 23 April, 2008
John
I noticed the ozone portion because it rang a bell fro what I had read previously in Mackeys paper.
5.AnthonySG1 at 20:25 PM on 9 May, 2008
OK smarties. If Antarctica is overall losing ice, then how do you explain the data?
http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/current.area.south.jpg
The Arctic doesn't seem to be doing so bad anymore, also:
http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/current.area.jpg
[ Response: Funny you should ask, the last few weeks, I've been preparing a series of posts on Antarctica and the Arctic. First one next week. Stay tuned... ]
6.Second order skeptic at 22:45 PM on 24 June, 2008
AnthonySG1: Your images are concerned with the ice _area_ . Ice _mass_ on the other hand is shrinking.
Antarctic Ice Loss Speeds Up, Nearly Matches Greenland Loss - NASA Jet Propulsion Laboratory
7.PaulM at 22:48 PM on 4 September, 2008
The misinformation on this site is astonishing.
Antarctic ice is increasing.
In addition to the cryosphere link provided Anthony,
This is confirmed by NSIDC,
Sea Ice Trends & Climatologies from SMMR & SSM/I - Total Antarctic
by NCDC,
State of the Climate | Global Analysis | April 2008
and by numerous scientific papers, including
Cavalieri and Parkinson, J. Geophys. Res. 113, C07004 (2008),
Comiso and Nishio, J. Geophys. Res. 113, CO2S07 (2008).
You have managed to find one paper that finds a decrease - but that only covers a 3 year period! Obviously you cannot get a significant trend from 3 years data.
8.Mizimi at 04:51 AM on 6 September, 2008
"NASA Finds VAST Regions of West Antarctica Melted in Recent Past 05.15.07
A team of NASA and university scientists has found clear evidence that EXTENSIVE areas of snow melted in west Antarctica in January 2005 in response to WARM TEMPERATURES. This was the first WIDESPREAD Antarctic melting ever detected with NASA's QuikScat satellite and the MOST SIGNIFICANT MELT observed using satellites during the past three decades. Combined, the affected regions encompassed an area as big as CALIFORNIA."
My caps. - just look at the map and tell me the use of those words is justified. The ACTUAL area involved is a FRACTION of the ice sheets, even the IPCC reckon it would take over 1000yrs to melt if the worst of their predictions materialised.
9.Kuni at 15:30 PM on 21 December, 2008
Increase in sea ice a bad thing
Does growing sea ice in Antarctica bode well for the future? - By Brendan I. Koerner - Slate Magazine
. . . No one's entirely sure what's causing the expansion of sea ice in Antarctica, but the likeliest explanation is a disturbing one. According to a 2005 NASA-funded study, warmer temperatures have caused greater snowfall around the continent's edges, where the open oceans provide plenty of raw material for precipitation. (Warmer air absorbs moisture more readily.) The weight of that excess snow pushes sheets of sea ice down into the water, causing more water to freeze.
The incremental expansion of Antarctica's sea ice has coincided with some more troubling changes. Four of the continent's largest glaciers (whose fates are largely unrelated to that of sea ice) are retreating rapidly, and researchers blame increases in ocean temperature. The diminishment of such massive glaciers means that, despite the slow creep forward of the continent's sea ice, the total mass of all Antarctic ice—which includes inland ice—has experienced a marked decrease. And a continuation of that trend could lead to significant rises in global sea levels. Furthermore, snow is melting much farther inland than ever, as well as high up in the Transantarctic Mountains. . .