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What Does Arctic Climate Tell Us?
October 18, 2007 23:03


Solar activity

Russian scientist claims global warming can be just a temporary inconvenience, since climatic changes show their natural fluctuating patterns and depend on our Sun’s activity level. Research fellow of the Arctic and Antarctic research and science centre suggests the phenomenon, widely known as global warming, is not more than a natural variation.

Recent 40 or 50 years showed that Arctic climate was getting warmer and now temperatures continue rising. Majority of scientists explains such behaviour with growing concentration of main greenhouse gases in the atmosphere and is sure that temperatures would definitely grow till the end of 21st century. If the tendency and growing speed remain the same, the Arctic would enter the year 2100 with air temperature 4-7 degrees higher than it has now, and with ice areas twice as little as the current ice cover of the North. However, another point of view exists, suggesting long-term temperature rising to be just an episode of global history, a consequence of natural fluctuations, which depend on changes in solar activity and surface air pressure.

 

The scientist has analyzed data of monthly average values of surface air pressure between November and April 1923-2005 in cellular mesh points, located northwards from 40th parallel of the northern hemisphere. Mesh step is 10 degrees in latitude and 30 degrees in longitude. Then the geographer compared air pressure fluctuations with changes of solar activity in the same time period. 1927 was the year, when 16th solar cycle ended, and now we live in the 23rd cycle, which is far from its end. Every 11-year preiod contains three years of high solar activity and eight years, during whuich our Sun is not quite active.

Intensification of solar activity in every cycle is accompanied with abnormal changes of surface air pressure in high and moderate latitudes. There exist two regions, in which mentioned abnormalities are detected most often. First one is located in the northern part of the Atlantic Ocean and Near-Atlantic Arctic, including waters around Greenland and Iceland, the North Sea, the Greenland Sea, the Norwegian Sea and the Barents Sea and Canadian Arctic Islands. The second region includes the northern part of the Pacific Ocean and Near-Pacific Arctic together with waters around the Aleutian Islands, the Bering Sea and the Chukchee Sea, as well as north-eastern coast of Asia. Pressure changes in these two regions always happen in antiphase. In case when solar activity rises and pressure increases in the Atlantic region, then in the Pacific one the pressure drops and vice versa. These pressure fluctuations are like scale balance with centre located in the Arctic. Pressure discrepancy in these centres changes from 4.5 to 7 millibar.

 

Changes in surface air pressure can cause long-term natural anomalies, for instance, if presuure over Atlantic keeps growing, then warm waters from moderate latitudes travel to the Arctic through the strait between the Greenland and Europe slower. Such situation was detected during 21st and 22nd solar cycles in the sixties and eighties of the previous century and coincided with cooling in the Arctic. If pressure over Atlantic drops, then speed of warm water transfer grows, like in 1920-1940s, when warming was detected in the Arctic.

During the 22nd solar cycle, which started in 1986, the pressure over vast territories of the northern hemisphere, including Canada, Greenland, the Arctic Ocean, Eastern Europe, Eastern and Western Siberia, dropped significantly. This stage of natural fluctuations concurs with current climate state, which is usually called the global warming. However, in the next solar cycle the pressure over the Northern Atlantic may change, causing the end of global warming.

Source:
    Russian Science News

Kizilova Anna


Tags: ecology     

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