Arctic Sea Ice Decline and Climate Change?

Arctic Warming 1918–1939 by Human Activities?

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  • The huge warming of the Arctic that started in the early 1920s and lasted for almost two decades is one of the most spectacular climate events of the 20th century (Bengtsson, 2004).
  • At least Polyakov (2002) get the timing right: The period from 1918 to 1922 displays exceptionally rapid winter warming not only in the circum-Arctic region northward of 62oN. (Polyakov, 2002).
  • A meridional pattern was also seen in the late 1930s with anomalous winter (DJFM) SAT, at Spitsbergen (Overland, 2008).
  • Average Arctic temperatures increased at almost twice the global average rate in the past 100 years. Arctic temperatures have high decadal variability, and a warm period was also observed from 1925 to 1945. (IPCC, 2007)
  • We theorize that the Arctic warming in the 1920s/1930s was due to natural fluctuations internal to the climate system (Johannessen, 2004).
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