A comparative study on environmental change response over the northern and the southern regions of the Qinling Mountains
Received date: 2001-06-15
Revised date: 2001-09-10
Online published: 2001-10-15
Based on the data up to 1999 from the hydro-climatological departments, this paper analyzes the climatic dividing implications of Qinling Mountains in regional response to the process of global warming, due to which the Grades of Dryness/wetness (GDW) in 100-year scale show that the northern region has entered an arid period, and the southern, a humid period. At decade scale, the D-value of annual average air temperature over Southern Shaanxi (Hanjiang Valley) and Central Shaanxi Plain (Guanzhong Plain) has narrowed, i.e. the former with slight change and the latter with rapid increase in temperature. Both regions are arid with decease in precipitation D-value, namely, the plain becomes warmer while the south drier. Qinling Mountains play a predominant role in the climatic dividing. The runoff coefficient (RC) of Weihe River decreases synchronously with that of Hanjiang River due to climate warming . The RC of Weihe dropped from 0.2 in the 1950s to less then 0.1 in the 1990s.Weihe valley (Guanzhong Plain) is practically an arid area as a result of the shortage of water .The successive 0.5 and 1.0℃ temperature anomaly over China marks, perhaps, the important transition period in which the environment becomes more vulnerable than before .The study shows the obvious trend of environmental aridity, which is of help to the understanding of regional response to the global climate change.
Key words： climate change; aridity; environmental change response; Qinling Mountains
YAN Jun-ping, ZHENG Yu . A comparative study on environmental change response over the northern and the southern regions of the Qinling Mountains[J]. GEOGRAPHICAL RESEARCH, 2001 , 20(5) : 576 -582 . DOI: 10.11821/yj2001050007
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