The statistic and variance of cyclones in Northwest Passage of Arctic from July to October in 1979-2015

Qin Ting; Wei Lixin

doi:10.3969/j.issn.0253-4193.2018.11.010

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Qin Ting, Wei Lixin. The statistic and variance of cyclones in Northwest Passage of Arctic from July to October in 1979-2015[J]. Haiyang Xuebao, 2018, 40(11): 96-104. doi: 10.3969/j.issn.0253-4193.2018.11.010

Citation:

Qin Ting, Wei Lixin. The statistic and variance of cyclones in Northwest Passage of Arctic from July to October in 1979-2015[J]. Haiyang Xuebao, 2018, 40(11): 96-104. doi: 10.3969/j.issn.0253-4193.2018.11.010

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The statistic and variance of cyclones in Northwest Passage of Arctic from July to October in 1979-2015

doi: 10.3969/j.issn.0253-4193.2018.11.010

Qin Ting,
Wei Lixin

Key Laboratory of Research on Marine Hazards Forecasting, Beijing 100081, China;National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China

Received Date: 2018-01-18
Rev Recd Date: 2018-04-16

Abstract

Abstract

Based on the data of the ERA-Interim mean sea level pressure field in the European Center for Medium-Range Weather Forecasts, this paper uses the cyclone automatic identification and tracking algorithm to establish the cyclone data from July to October in the east and west of the Northwest Passage of the Arctic from 1979 to 2015. The data include cyclone basic latitude and longitude position information and the cyclone center minimum pressure value. Based on this set of data, this paper analyzes the climatological characteristics, spatial density distribution, cyclone intensity characteristics, cyclone deepening and the activity of explosive cyclones over the Northwest Passage from July to October. The number of cyclones at the east and west region of the Northwest Passage is significantly different. The number of cyclones at the east is more than twice that of the west, and the trend of the number of cyclones at both regions is inconsistent. The trend of the number of cyclones at the west region shows an insignificant decrease but an insignificant increase in east region. The overall cyclone intensity of the northwest channel was weak. The cyclone with the lowest atmospheric pressure reaching 980 hPa accounted for only 5% of the total number of cyclones. The lowest center of cyclone pressure is concentrated between 990-1 000 hPa. Since 1979, the overall trend of cyclone intensity in the eastern region has increased, and the cyclone in the western region also significantly increased before 2002, but the overall cyclone intensity in the western region turned weak after 2002. Cyclone life history concentrated in less than 7 days, the eastern cyclone within a day significantly more than the number of cyclones. The western region of the density distribution of cyclones is mainly distributed in the north of Beaufort Sea north of 74°N. The eastern region is mainly distributed in the northeast of Baffin Bay and the southeast of Baffin Island. In recent years, there has been a slight shift in the eastward and westward shifts of the main density distribution area of the cyclone. The growth of explosive cyclones in the Northwest Passage is concentrated near 70°N coasts, especially in northern Canada and near the west coast of Greenland. The North Atlantic Oscillation Index is significantly positively correlated with the number of cyclones in the eastern region.
- Northwest Passage of Arctic,
- cyclones,
- automated detection and tracking algorithm

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References(15)

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