Since 1979, the volume of summer Arctic sea ice has declined by 75% and accelerating.… This video by Andy Lee Robinson illustrates the dramatic decline from 1979 until September 2, 2012.
Bad news comes in 3’s, so here’s the third installment of “melt news” from this summer.
1/ Greenland ice melt hit a record.
2/ Surface sea ice area minimum hit a record.
3/ Surface sea ice VOLUME has also hit a record low. The importance of this is when thickness is reduced the ice is susceptible to break up caused by storms and wave movement. It also provides a less stable base for new ice forming.
We have already seen this summer that melting ice on Greenland reached altitudes 2 – 3 kilometers above sea level causing an unprecedented 97% of Greenland to experience melting ice. (below).
The next data set showed a dramatic increase in melting of the Greenland ice sheet this northern summer, breaking the previous record ice melt on Greenland in 2010. http://www.greenlandmelting.com/1/post/2012/08/2012-the-goliath-melting-year.html
At the same time a new record low in summer Arctic sea-ice COVER broke the 2007 sea ice surface cover record minimum. (below).
Average July through September Arctic sea ice extent 1870-2008 from the Un. of Illinois (Walsh & Chapman 2001 updated to 2008) and observational data from NSIDC for 2009-2011. Black vertical dashed lines indicate the years 1938-43, used by some sceptics to repeat the tired old line of “natural variation” being responsible for this years melt.. Arctic sea ice extent from August 2012 from NSIDC (purple) overlaid on a map of sea ice extent in August 1938 from the Danish Meteorological Institute. Red symbols indicate direct observations in 1938. (below). http://www.skepticalscience.com/record-arctic-sea-ice-melt-to-levels-unseen-in-millennia.html Thirty years ago, the summer sea-ice extent was around 7.5 million square kilometres, but this year it will end up at half that figure. THE LOSS OF ARCTIC SEA ICE AREA THIS YEAR WAS 100,000 SQUARE KILOMETERS PER DAY DURING THE MELT SEASON. SEA ICE VOLUME. Sea ice volume hit a new low with this years total being APPROX 75% OF THE AVERAGE VOLUME SINCE SATELLITE RECORDING BEGAN. There seems to be no doubt in the scientific community that the “melt is on”. Forcing almost 20 billion tones of CO2 eqv. into the atmosphere every year is unlike ANY ‘natural’ forcing experienced for at least 10,000 years. Arctic temperature change reconstructed by Kaufmann et al. (2009) including data updated for and including instrumental measurements for the Arctic region (60 to
90° N) from NASA. WHAT IS ALSO CERTAIN IS THAT THE CURRENT MELT TRENDS ARE FAR WORSE THAN MODELLED TRENDS ACCEPTED BY I.P.C.C. REPORTS (below).