| AN ATTRIBUTION ANALYSIS OF CHANGES IN POTENTIAL EVAPOTRANSPIRATION IN THE BEIJING–TIANJIN–HEBEI REGION UNDER CLIMATE CHANGE |
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| 引用本文： | 于占江,周伟灿,张 晓.AN ATTRIBUTION ANALYSIS OF CHANGES IN POTENTIAL EVAPOTRANSPIRATION IN THE BEIJING–TIANJIN–HEBEI REGION UNDER CLIMATE CHANGE[J].热带气象学报(英文版),2019,25(1):82-91. |
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| 作者姓名： | 于占江 周伟灿 张 晓 |
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| 摘 要： | Based on the measurements obtained at 64 national meteorological stations in the Beijing–Tianjin–Hebei (BTH) region between 1970 and 2013, the potential evapotranspiration (ET0) in this region was estimated using the Penman–Monteith equation and its sensitivity to maximum temperature (Tmax), minimum temperature (Tmin), wind speed (Vw), net radiation (Rn) and water vapor pressure (Pwv) was analyzed, respectively. The results are shown as follows. (1) The climatic elements in the BTH region underwent significant changes in the study period. Vw and Rn decreased significantly, whereas Tmin, Tmax and Pwv increased considerably. (2) In the BTH region, ET0 also exhibited a significant decreasing trend, and the sensitivity of ET0 to the climatic elements exhibited seasonal characteristics. Of all the climatic elements, ET0 was most sensitive to Pwv in the fall and winter and Rn in the spring and summer. On the annual scale, ET0 was most sensitive to Pwv, followed by Rn, Vw, Tmax and Tmin. In addition, the sensitivity coefficient of ET0 with respect to Pwv had a negative value for all the areas, indicating that increases in Pwv can prevent ET0 from increasing. (3) The sensitivity of ET0 to Tmin and Tmax was significantly lower than its sensitivity to other climatic elements. However, increases in temperature can lead to changes in Pwv and Rn. The temperature should be considered the key intrinsic climatic element that has caused the "evaporation paradox" phenomenon in the BTH region.
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| 关 键 词： | Beijing–Tianjin–Hebei region climate change potential evapotranspiration climatic element sensitivity coefficient |
| 修稿时间： | 2018/10/18 0:00:00 |
AN ATTRIBUTION ANALYSIS OF CHANGES IN POTENTIAL EVAPOTRANSPIRATION IN THE BEIJING-TIANJIN-HEBEI REGION UNDER CLIMATE CHANGE |
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| YU Zhan-jiang,ZHOU Wei-can and ZHANG Xiao.AN ATTRIBUTION ANALYSIS OF CHANGES IN POTENTIAL EVAPOTRANSPIRATION IN THE BEIJING-TIANJIN-HEBEI REGION UNDER CLIMATE CHANGE[J].Journal of Tropical Meteorology,2019,25(1):82-91. |
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| Authors: | YU Zhan-jiang ZHOU Wei-can and ZHANG Xiao |
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| Abstract: | Based on the measurements obtained at 64 national meteorological stations in the Beijing-Tianjin-Hebei(BTH) region between 1970 and 2013, the potential evapotranspiration(ET_0) in this region was estimated using the Penman-Monteith equation and its sensitivity to maximum temperature(T_(max)), minimum temperature(T_(min)), wind speed(V_w), net radiation(R_n) and water vapor pressure(P_(wv)) was analyzed, respectively. The results are shown as follows.(1)The climatic elements in the BTH region underwent significant changes in the study period. V_wand R_ndecreased significantly, whereas T_(min), T_(max)and P_(wv)increased considerably.(2) In the BTH region, ET_0 also exhibited a significant decreasing trend, and the sensitivity of ET_0 to the climatic elements exhibited seasonal characteristics. Of all the climatic elements, ET_0 was most sensitive to P_(wv)in the fall and winter and R_nin the spring and summer. On the annual scale,ET_0 was most sensitive to P_(wv), followed by R_n, V_w, T_(max)and T_(min). In addition, the sensitivity coefficient of ET_0 with respect to P_(wv)had a negative value for all the areas, indicating that increases in P_(wv) can prevent ET_0 from increasing.(3)The sensitivity of ET_0 to T_(min) and T_(max) was significantly lower than its sensitivity to other climatic elements. However,increases in temperature can lead to changes in P_(wv) and R_n. The temperature should be considered the key intrinsic climatic element that has caused the"evaporation paradox"phenomenon in the BTH region. |
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| Keywords: | , , , , |
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