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Datum:14.06.06
Titel:GEOPHYSICAL RESEARCH LETTERS v. 13 June 2006: Greenland warming of 1920–1930 and 1995–2005
Link:www.agu.org/pubs/crossref/2006/2006GL026510.shtml
Details1:http://www.achgut.de/dadgd/view_article.php?aid=2592&ref=0

Uups: Grönlandklima nicht ungewöhnlich
Ist es in Grönland im letzten Jahrzehnt wirklich ungewöhnlich warm geworden? Wenn man der Medienberichterstattung und Al Gore glauben darf: Ja. Wenn man der jüngsten wissenschaftlichen Analyse glauben darf: NEIN.

Hier einige Auszüge aus der neusten Ausgabe von Geophysical Research Letters:

"We provide an analysis of Greenland temperature records to compare the current (1995-2005) warming period with the previous (1920-1930) Greenland warming. We find that the current Greenland warming is not unprecedented in recent Greenland history. Temperature increases in the two warming periods are of a similar magnitude, however, the rate of warming in 1920-1930 was about 50% higher than that in 1995 - 2005."

"An important question is to what extent can the current (1995-2005) temperature increase in Greenland coastal regions be interpreted as evidence of man-induced global warming? Although there has been a considerable temperature increase during the last decade (1995 to 2005) a similar increase and at a faster rate occurred during the early part of the 20th century (1920 to 1930) when carbon dioxide or other greenhouse gases could not be a cause. The Greenland warming of 1920 to 1930 demonstrates that a high concentration of carbon dioxide and other greenhouse gases is not a necessary condition for period of warming to arise. The observed 1995-2005 temperature increase seems to be within a natural variability of Greenland climate. A general increase in solar activity [Scafetta and West, 2006] since 1990s can be a contributing factor as well as the sea surface temperature changes of tropical ocean [Hoerling et al., 2001]."

"The glacier acceleration observed during the 1996-2005 period [Rignot and Kanagaratnam, 2006] has probably occurred previously. There should have been the same or more extensive acceleration during the 1920-1930 warming as well as during the Medieval Warm period in Greenland [Dahl-Jensen et al., 1998; DeMenocal et al., 2000] when Greenland temperatures were generally higher than today. The total Greenland mass seems to be stable or slightly growing [Zwally et al., 2005]."

"To summarize, we find no direct evidence to support the claims that the Greenland ice sheet is melting due to increased temperature caused by increased atmospheric concentration of carbon dioxide. The rate of warming from 1995 to 2005 was in fact lower than the warming that occurred from 1920 to 1930."

http://www.agu.org/pubs/crossref/2006/2006GL026510.shtml

(entdeckt in Benny Peisers CCnet)
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