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A cyclone statistics for the Arctic based on European Centre re-analysis data
Based on the six-hourly re-analysis sea-level pressure data of the European Centre for Medium-Range Weather Forecast (ECMWF) a cyclone statistics for the Arctic region north of 60° N is elaborated for the period 1 November 1986 to 31 October 1991. For each low pressure center on a weather map its location, central pressure and horizontal pressure gradients in E, W, N, and S direction are determined. Furthermore, cyclone centers are followed with time to calculate trajectories, pressure tendencies, and lifetimes. A horizontal grid of 300 km x 300 km is used as unit area for the statistical computations. A unit area experiences about 20 cyclone passages per year (range 5-40). On the average, six cyclones occur simultaneously in the Arctic region Lifetimes vary from 6 h to 15 days. The annual cyclone activity over the 5-year period is nearly the same. Cyclones are more frequent in summer (about 94 per month) than in winter (77 per month). In general summer cyclones are weaker than winter cyclones. On the average, the minimum central pressure during the lifetime of a cyclone is about 1000 hPa (typical range 980-1020) in summer and about 988 hPa (typical range 940-1030) in winter. In winter, a zone of high cyclone frequency extends from the region near Iceland over the Greenland Sea, Barents Sea, and Kara Sea to the Laptev Sea while the interior of the Arctic shows little cyclone frequency. In summer, the region near Iceland and the interior of the Arctic are separate centers of
Springer; Springer
ISSN : 0177-7971 CODEN : MAPHEU
Meteorology and atmospheric physics (Print) A. 2000, vol. 75, n° 3-4, pp. 233-250 [bibl. : 17 ref.]
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