"“We have lent a huge amount of money to the U.S. Of course we are concerned about the safety of our assets. To be honest, I am definitely a little worried.” "

Chinese premier Wen Jiabao 12th March 2009

""We have a financial system that is run by private shareholders, managed by private institutions, and we'd like to do our best to preserve that system."

Timothy Geithner US Secretary of the Treasury, previously President of the Federal Reserve Bank of New York.1/3/2009

Saturday, October 29, 2005

Greenland Ice Sheet grows - reason ? Snow in Winter

Recent Ice Sheet Growth in the Interior of Greenland

Climate scientists from Bergen have published a paper on October 20th Science Express, (which previews elected papers before publication in Science). They report growth estimated to be about 6 cm per year during the study period, 1992–2003 of the Greenland Ice sheet..

Climate change debates have promoted these studies using satellite data over the last 11 years – a much hyped publicised sea level increase of 7 metres would result from the Greenland Ice field melting. This process, expected on a millennial time scale, should begin upon crossing the critical threshold for surface air temperature increase (~3ÂșC) for Greenland, predicted to happen before the end of this century.

Second, increased Greenland Ice Sheet melt and freshwater input into the northern North Atlantic Ocean is theorized to weaken the Gulf Stream at high latitudes and possibly even disrupt the global thermohaline circulation on a relatively rapid, multi-decadal time scale.

Johannessen and co-workers attribute the observed growth in the interior of the Greenland due to increased snowfall brought about by variability in the regional atmospheric circulation, the so-called North Atlantic Oscillation (NAO) phenomenon.i.e snow in winter.

Using their ice-sheet elevation estimates, the known NAO, the researchers established, for the first time, a direct relationship between Greenland Ice Sheet elevation change and the NAO. i.e snow in winter.

Elevation changes during winter were found to be negatively correlated (–0.88) to the winter NAO index, explaining about three quarters of the elevation changes.

Therefore, strongly negative NAO-index conditions lead to increased accumulation and elevation change during wintertime and vice versa.

The strong correlation between winter elevation changes and the NAO index, suggests a previously underappreciated role of the winter season and the NAO for elevation changes – a wildcard in Greenland Ice Sheet mass-balance scenarios under global warming.

In other words, observed phenomena do not fit the extrapolations of the Global Warming theory – It is interesting therefore to consider the views of the much loved IPCC (Acronym for Scientific jihad against Industrial development) in seeking to explain the mission of NASA’s ICE Satellite.

A key category of scientific uncertainty identified by the IPCC is "Polar ice sheets which affect predictions of global sea level change".Early commencement is needed to establish a baseline on ice balance beforegreenhouse warming becomes more significant.

It is not known whether Greenland and Antarctic ice sheets are growing or shrinking (uncertainty is +- 30% of mass input = +- 5 cm/yr averageice thickness = +- 2.3 mm/yr global sea level change). ICESat will measure< 1 cm/yr average ice thickness change ( < 5% of mass input and <0.4 mm/yr global sea level change).

It is not known whether future changes in mass balance associatedwith climate warming will be positive or negative (sensitivity perhaps- 10% to + 20% change in mass input/K temperature change = +0.8 mm/yr/Kto - 1.6 mm/yr/K sea level change). ICESat should measure changes inmass balance expected for 1 K polar warming (depends on sensitivity estimate).

Regrettably EU’s CRYOsat didn’t achieve lift off so their plans to measure polar ice caps will not be available for some time (see previous posting) … try 5 years.

Meanwhile here is a picture of the very cold Greenland interior © Petter Bjorstad, Bergen, Norway.

Recent blogs on same topic here

1 comment:

josh narins said...

I believe the evidence is that the planet has warmed, and there is strong evidence to point to a human role.

I believe your post here helps prove it.

Why is it snowing more in Greenland? More water in the atmosphere, perhaps?

Global warming of a few degrees is not going to result in a melting of antarctica, for instance. The increased sea level will, if I understand the water cycle correctly, increase precipitation.

You read that story a month or so ago about a peat bog, with petagrams of mass, melting for the first time in ~9,000 years? Basic report from The Guardian.

I am open minded about this. I suppose there is a chance that the sun is solely responsible. The fact that earthlings generate more than a Quintillion Btu is probably irrelevant completely. But the one thing the anti-global warmers could most easily rest their hat on was the "no heat rise in the troposphere" claim, which was recently shown to be false.

(C) Very Seriously Disorganised Criminals 2002/3/4/5/6/7/8/9 - copy anything you wish