Climate characteristics and effects of urbanization of the urban high temperature of Beijing, Tianjin and Hebei, China
Using the daily maximum temperature data from May to August of 13 meteorological stations in Beijing, Tianjin and Hebei, we analyzed the temporal evolution and spatial distribution features of the urban high temperature of the above-mentioned cities. The urbanization effects of high temperature in different regions of Beijing-Tianjin-Hebei are studied by comparing the stations in the cities with those in nearby towns. The results show that: (l)The spatial distribution features of the urban high temperature of Beijing-Tianjin-Hebei show that there is a high value centre in the southwest decreasing to the northeast, composing a high value ridge from Shijiazhuang to Chengde; (2)The inter-annual variability of the urban high temperature of Beijing-Tianjin-Hebei indicate that for the cities in the northeast 1965-1998 is the period with less high temperature days, while 1999-2010 is the period with more high temperature days above 37℃ and 40 ℃. The other cities in Beijing-Tianjin-Hebei have the similar trends: the period of 1997 -2010 has the most high temperature days, the period of 1960-1972 comes for the second, 1973-1996 is the period with the least number of high temperature days; (3) Days of high temperature above 35 ℃in the northeast region of Hebei show a significant increasing trend since 2001, it has a sudden change in 1991-1992. Days of high temperature above 35 ℃in the south region of Hebei show a increasing trend since the 21st century; days of extreme high temperature above 37 ℃in the south region of Hebei show a significant increasing trend during 1999-2010, the sudden change year is 1996-1997. Days of high temperature above 35℃in Beijing have an increasing trend during 1998-2010, the abrupt change occurs in 1995-1996; The ones above 37℃have an obvious increasing trend since the end of 1990s to the year 2010, the abrupt change year is 1985-1986. Both the days of extreme high temperature above 40 ℃in the south region of Hebei and the days above 37℃in Tianjin have an increasing trend since 1960; (4)Since the 1970s, effects of urbanization gradually reveal in the northwest and south region of Hebei province which gets enhanced respectively from the 1990s and 1980s. The effects of urbanization of big cities in the northeast of Hebei-Beijing-Tianjin show no increasing trends in recent years, however, the effects of urbanization in small towns gradually reveal from the late 1990s to 2010. The reason might be the rapid growth of population in small towns and the increasing of urban area.
high temperatureinter-annual variabilityeffects of urbanizationcities in Beijing-Tianjin-Hebei
国家科技期刊平台
NSTL
万方数据
维普
