Abstract
With the influence of global climate warming, the responses of regional hydroclimatic variables to climate change are of great importance for water resource planning and management. The evolution of precipitation, mean temperature, and runoff at different timescales, was investigated using the Mann–Kendall test from 1969 to 2011 in the Miyun Reservoir Basin, China. In addition, three precipitation indices and different precipitation grades were also considered. Annual precipitation had a non-significant decreasing trend, flood precipitation trend was significantly decreasing with a magnitude of 18.50 mm/10 years, and non-flood precipitation trend was significantly increasing with a magnitude of 6.91 mm/10 years. Precipitation frequency in flood season featured a significantly decreasing trend. Meanwhile, flood precipitation intensity for large rain (25 ≤ p < 50 mm/day) and non-flood precipitation amount for medium rain (10 ≤ p < 25mm/day) also showed significant increasing trends. The mean temperature exhibited significant upward trends during the year, in flood season, and in non-flood season with rates of 0.36 °C/10 years, 0.32 °C/10 years and 0.38 °C/10 years, respectively. The magnitude of the mean temperature increase in the non-flood season was greater than in the flood season. Runoff experienced continuous and significant downward trends of 1.6 × 108 m3/10 years, 1.1 × 108 m3/10 years and 0.40 × 108 m3/10 years, respectively, during the year, in flood season, and in non-flood season. The decreased annual streamflow was more obvious after 2000 than before. The results obtained in this study could be used as references for decision-making regarding water resource management in the watershed.
Highlights
Due to greenhouse gas emissions resulting from anthropogenic activities [1], global climate warming is undoubtedly happening
Within the context of global warming, this study investigated regional responses of Within the context of global warming, this study investigated regional responses of hydroclimatic hydroclimatic variables to climate changes in the Miyun Reservoir Basin (MRB)
The analysis presented here demonstrated that the mean annual temperature in the MRB has increased by 1.55 ◦ C over the past 43 years, and this increase was greater than in the Haihe River Basin and at the global level (0.72 ◦ C during 1951–2012) [43]
Summary
Due to greenhouse gas emissions resulting from anthropogenic activities [1], global climate warming is undoubtedly happening. As supported in the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR5), globally averaged temperature increased 0.85 ◦ C between 1880 and. Identifying the characteristics of regional climate change and their potential impacts on the natural system, especially at the basin scale, has attracted widespread attentions from both academic circles and government. Changes in long-term hydroclimatic variables such as precipitation and temperature could represent regional climate change. To understand regional climate change impacts, it is relevant to investigate the changing properties of hydroclimatic variables as the first step in the backdrop of addressing global warming [4]
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