ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 38 Issue 5 > 2012,38(5):635-640. DOI:10.7519/j.issn.1000-0526.2012.05.016 Prev Next
Analysis of the February 2012 Atmospheric Circulation and Weather
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Abstract:
The characteristics of general circulation of atmosphere in February 2012 are as follows. There were two polar vortex centers in the Northern Hemisphere, which were located at the northeast of Canada and sea of Okhotsk, respectively. The latter has strengthened compared to the mean conditions. The circulation presented meridional patterns at the middle and high latitudes. There were active blocking anticyclones near the Ural Mountains persistently and their strength was higher than the normal. The average south branch trough was located at 90°E nearly, at the general average position, but stronger than the mean conditions. In February, the mean temperature is -3.2℃, warmer than that in January (-7.2℃), but colder than the same month of normal years (-2.0℃). The average precipitation all the country is 14.5 mm, less than that in January (16.8 mm), and less than the same month of normal years (17.6 mm). There were three cold air events affecting most of the country, and three precipitation processes in this month. There were extreme precipitation events happening at south of the Tibet. In Yunnan Province and southwest of Sichuan Province, the meteorological drought was developing. The cold, rainy (snowy), and less sunshine weathers were continuing in southern China.
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