Impact of Urbanization on Low-Temperature Precipitation in Beijing during 1960–2008简 |
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作者姓名: | HAN Zuoqiang YAN Zhongwei LI Zhen LIU Weidong WANG Yingchun |
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基金项目: | supported by National Natural Science Foundation of China(Grant No.41075063);Chinese Academy of Sciences Strategic Priority Research Program(Grant No.XDA05090000);National Basic Research Program of China(Grant No.2012CB956200) |
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摘 要: | Daily precipitation and temperature records at 13 stations for the period 1960-2008 were analyzed to identify climatic change and possible effects of urbanization on low-temperature precipitation LTP, precipitation of ≥ 0.1 mm d^-1 occurring under a daily minimum temperature (Tmin) of ≤ 0℃] in the greater Beijing region (B JR), where a rapid process of urbaniza tion has taken place over the last few decades. The paper provides a climatological overview of LTP in B JR. LTP contributes 61.7% to the total amount of precipitation in B JR in the cold season (November-March). There is a slight increasing trend 1.22 mm (10 yr)^-1] in the amount of total precipitation for the cold season during 1960-2008. In contrast, the amount of LTP decreases by 0.6 mm (10 yr)^-1. The warming rate of Train in B JR is 0.66℃ (10 yr)^-1. Correspondingly, the frequency of LTP decreases with increasing Tmin by -0.67 times per ℃. The seasonal frequency and amount of LTP in southeast B JR (mostly urban sites) are 17%-20% less than those in the northwestern (rural and montane sites). The intensity of LTP for the urban sites and northeastern B JR exhibited significant enhancing trends 0.18 and 0.15 mm d^- 1 (10 yr)^- 1, respectively]. The frequency of slight LTP (〈0.2 mm d^-1) significantly decreased throughout B JR by about -15.74% (10 yr)^-1 in the urban area and northeast B JR], while the contribution of the two heaviest LTP events to total LTP amount significantly increased by 3.2% (10 yr) ^-1.
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关 键 词: | 城市化进程 低温脱溶 北京 寒冷季节 日降水量 LTP 城市用地 日最低气温 |
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