International Journal of Geo-Information Article Exploring the Relationship between the Arid Valley Boundary’s Displacement and Climate Change during 1999–2013 in the Upper Reaches of the Min River, China Yalin Guo, Qing Wang * and Min Fan School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China;
[email protected] (Y.G.); fi
[email protected] (M.F.) * Correspondence:
[email protected]; Tel.: +86-28-6608-9459 Academic Editor: Wolfgang Kainz Received: 2 March 2017; Accepted: 24 April 2017; Published: 6 May 2017 Abstract: The arid valley is a unique type of ecological fragile landscape in the Hengduan Mountain Area, China. The boundary of the arid valley is one of the response indicators to mountainous climate change. Based on the meteorological data from 1999 to 2013 and the SPOT remote sensing images in 1999 and 2013 this study explored the response characteristics of the arid valley boundary to regional climate change in the upper reaches of the Min River in the Hengduan Mountains. The results are as follows: (1) During 1999–2013, the temperature, precipitation, and evaporation increased, and the sunshine duration and relative humidity showed decreasing trends at the rates of 0.008 ◦C/a, 2.25 mm/a, 5.51 mm/a, −8.72 h/a, and −0.19%/a, respectively. Meanwhile, the climate showed the warm-dry tendency in the southern region and the warm-humid tendency in the central and northern areas. (2) On the whole, the arid valley boundary mainly distributed between 1601–3200 m and moved downward to 2428 m at the speed of −0.76 ± 0.26 m/a along with global warming.