辽宁电线覆冰日数气候特征与大气环流异常的关系

doi:10.3969/j.issn.1673-503X.2021.03.017

Abstract

Abstract:

Using data from 11 meteorological stations with wire icing observation projects in Liaoning province from 1980 to 2019, NCEP reanalysis data, and Hadley sea surface temperature data, the climatic characteristics of the icing days of Liaoning electrical generators and the circulation characteristics that were conducive to the occurrence of icing were analyzed.The results show that there are three high value regions for the occurrence of wire icing phenomenon in Liaoning province, which are in the northern area of Liaoning province, the mountainous area in eastern Liaoning, and the coastal area of central and western Liaoning province.The wire icing phenomenon in Liaoning province mainly occurs from October of the current year to April of the following year, and the number of wire icing days from 1980 to 2019 shows a significant decrease.The number of wire icing days has a significant interannual variation cycle, the main interannual variation period is 5-7 years, and the interannual oscillation energy has undergone 3 changes of strength-weakening in the recent 40 years.The difference of SST anomaly between high index years and low index years in Autumn from September to November in Liaoning province shows the distribution of El Nino type.The SST in the Pacific presents El Nino type in the more wire icing year, the overall SST in the Northwest Pacific is relatively cold, and the SST in the sea of Japan has an obvious negative anomaly.At the same time, there is a high pressure center over Lake Baikal on the mainland, and the latitudinal direction of the northern hemisphere in Asia is "high in the north and low in the south".The winter monsoon is stronger, and the cold air moves southward frequently.Liaoning province is controlled by the northeast airflow, on the southeast side of the abnormal anticyclonic circulation of Lake Baikal, and there is a weak anticyclonic circulation over the Sea of Okhotsk which leads to an abnormal east wind over the Sea of Japan.When the southbound cold air and the east side of the Sea of Japan transport cold water vapor intersection, it is easy to lead to the cold fog, causing the rime phenomenon.The supercooled water vapor condenses on the wires and causes the wires to become iced.

Key words: Wire icing, Climatic characteristics, Circulation characteristics

CLC Number:

P426.3⁺3

Xiu-bo SUN,Wan-ying ZHANG,Jian-qiang ZHANG,Cong LUO. The relationship between climate characteristics of wire icing days in Liaoning province and atmospheric general circulation anomalies[J]. Journal of Meteorology and Environment, 2021, 37(3): 125-131.

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站名	营口	丹东	沈阳	宽甸	开原	阜新	锦州	鞍山	桓仁	本溪	大连
年均覆冰日数/d	2.7	2.6	2.0	1.9	1.8	1.4	1.4	0.95	0.88	0.6	0.3

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The relationship between climate characteristics of wire icing days in Liaoning province and atmospheric general circulation anomalies

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