Previous studies of lake evolution have mainly focused on the important role of runoff, precipitation, and/or snow melt water in hydrological systems ( Zhai et al., 2011 Long et al., 2012 Liu et al., 2013 Li et al., 2016). Understanding lake evolution patterns can help us predict lake development trends and manage water resources ( Panizzo et al., 2013 Creutz et al., 2016 Lopez et al., 2019 Wan et al., 2019 Woolway et al., 2020).
Lakes are important water resources, especially in hyper-arid areas. As a record from groundwater recharge lakes in deserts, our study provides new insight into projecting future lake changes in hyper-arid areas. Although precipitation has increased in the arid region of Northwest China in recent decades with increasing temperature, the enhancement of the evaporation effect is much greater. Comprehensive analysis of regional climate data suggests that the increase in evaporation caused by rising temperature is an important factor affecting lake evolution in the desert. During the second period from 1950 to 2018, the contents of TOC, TN, and carbonate minerals increased rapidly at the beginning of the 1950s, indicating that the lake’s primary productivity and salinity increased. In the first period from 1880 to 1950, the TOC and TN contents were low, and the minerals consisted of all detrital minerals, which indicate that the lake’s primary productivity and salinity were low. The evolution of Sayinwusu Lake since 1880 can be divided into two periods. 210Pb and 137Cs dating, total organic carbon (TOC) and total nitrogen (TN) contents, and mineral content analysis were used to reconstruct the lake evolution over the past 140 years. In this study, an 86 cm-long sediment core was extracted from Sayinwusu Lake, one of groundwater-recharge lakes in the southeastern Badain Jaran Desert, Northwest China. Previous studies have mainly focused on lakes with runoff recharge, while the evolution of groundwater recharge lakes in hyper-arid areas is still less known. Understanding the evolution of lakes in arid areas is very important for water resource management. 3Key Laboratory of Quaternary Chronology and Hydro-Environmental Evolution, China Geological Survey, Shijiazhuang, China.2Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, China.
1Centre for Glacier and Desert Research, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China.Gaolei Jiang 1,2,3*, Nai’ang Wang 1*, Xin Mao 2,3, Hua Zhao 2,3, Linjing Liu 2,3, Jianmei Shen 2, Zhenlong Nie 2 and Zhe Wang 2
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