Climate Change in Eurasian Arctic Shelf Seas: Centennial Ice by Ivan E. Frolov, Zalmann M. Gudkovich, Valery P. Karklin,

By Ivan E. Frolov, Zalmann M. Gudkovich, Valery P. Karklin, Evgeny G. Kovalev, Vasily M. Smolyanitsky

In this publication the eminent authors examine the ice disguise variability within the Arctic Seas in the course of the 20th and early 21st centuries. within the first chapters, they convey that multi-year alterations of the sea-ice quantity within the Arctic Seas have been shaped by way of linear developments and long term (climatic) cycles lasting approximately 10, 20 and 60 years. The constitution of temporal variability of the western quarter (Greenland – Kara) differs considerably from the japanese area seas (Laptev and Chukchi). within the latter zone, not like the previous region, rather short-period cycles (up to ten years) predominate. The linear tendencies will be concerning a super-secular cycle of climatic adjustments over approximately 2 hundred years. the main major of those cycles, lasting 60 years, is such a lot mentioned within the western zone seas.

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Extra resources for Climate Change in Eurasian Arctic Shelf Seas: Centennial Ice Cover Observations

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The half-century wave period, identi®ed by these authors for the ®rst time, lasts 55±60 years, which is quite close to the rough estimates given above. Similar variability was detected in air temperature changes in a zone from 72 N to 87 N and in recurrence of the main atmospheric circulation forms identi®ed by Vangengeim (1935) and Girs (1960). Karklin et al. (2001) noted that the long-period ice extent variability in the Arctic Seas, unlike shorter-period variability, does not indicate an opposition in phase between the western and eastern regions, which may testify to their common nature.

Then, a relatively cooling trend was observed from the late 1950s to the late 1970s, which was in turn replaced by a new warming trend at the end of the century when the temperature reached its maximum in the late 1990s to the early 2000s. 1 approximated by a polynomial to the sixth power, suggests that the duration of this cycle is about 50±60 years. 2, see color section). 2 quite clearly shows the main features of surface air temperature variability in the high-latitude zone with alternation of cold and warm phases in a 60-year cycle.

The boundaries of the indicated time intervals and the intensity of the changes varied slightly from region to region and from winter to summer. In Karklin et al. (2001), data on interannual changes in the total ice extent of the Siberian Arctic Seas in the twentieth century were approximated by a polynomial to the sixth power. The curve thus obtained well re¯ects the long-period variability of the ice extent in the region under consideration. The half-century wave period, identi®ed by these authors for the ®rst time, lasts 55±60 years, which is quite close to the rough estimates given above.

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