The relationship between climate characteristics of wire icing days in Hubei Province and atmospheric general circulation anomalies
CHEN Xiaoming1, 2, HU Miao3, HUANG Junjie1, 2
(1. State Grid Hubei Electric Power Research Institute, Wuhan 430077; 2. State Grid Key Laboratory of On-site Test Technology on High Voltage Power Apparatus, Wuhan 430077; 3. Wuhan Regional Climate Center, Wuhan 430074)
The daily wire icing data at 11 meteorology stations over Hubei Province, sea surface temperature (SST) from Hadley Centre, and reanalysis dataset from NCEP from 1980 to 2014 were used to analyze the climatic variation characteristics on the wire icing days in winter (from November to March) in Hubei. Moreover, we analyzed the field of sea temperature and atmosphere in the fall and winter of the anomalous wire icing years. The results indicate that the wire icing days distribute mainly in five cities (towns) namely Zhongxiang, Jingzhou, Xiangfan, Xiantao and Suizhou in Hubei, accounting for 73% of the total icing days of 11 stations. Wire icing days generally are observed from November of the current year to March of the next year in Hubei, and show a significant decreasing trend during the early 1990s. In the anomalously more icing years, the anomalous SST distribution with El Nino pattern is found over the central and eastern Pacific in tropics from September to November of the previous year. In the same period, water vapor from the South China Sea and the Bay of Bengal in winter is northward conveyed to Hubei, and northeast airflow in southeast side of Lake Baikal anomalous anti-cyclone and southerly airflow in northwest side of anomalous anti-cyclone at the coast of eastern China interact on Hubei, which is favorable to the occurrence of precipitation and the emergence of icing in Hubei Province.