关键词: 辽宁省, 极端气温指数, 变化特征

Abstract: Based on the daily average, maximum and minimum temperature from 52 meteorological stations in Liaoning Province, the variation characteristics of the extreme temperature events are analyzed using ten extreme temperature indices, which are commonly used abroad. The results show that the distribution of the annual average extreme temperature events have obvious regional differences. Temporally, the extreme warm events (warm days, warm nights, summer days, tropical nights, heat wave last indices) have increasing trends and the extreme cold events (cool days, cool nights, freeze days, frost days, cold snap last indices) have decreasing trends during 1961-2012; the extreme warm events had markedly increased in the mid-1990s and the extreme cold events had markedly decreased in the late 1980s; the changing rates of extreme warm events are less than that of the extreme cold events; the diurnal temperature range has an increasing trend in the province; the increasing (decreasing) trends of the extreme warm (cold) events are more significant in autumn (winter). Spatially, the extreme temperature events almost are increasing or decreasing coincidently in the province. Most extreme temperature events have about 8-years period of oscillation. Abrupt change had taken place in the mid-1980s to the late 1990s. In Liaoning Province, after the climate warming beginning from the late 1980s, the extreme warm events and cold events have all significantly increased and decreased.

Key words: Liaoning Province, extreme temperature indices, variation characteristics