Spatial–temporal trends of hydrological transitions in thermokarst lakes on Northeast Qinghai–Tibet Plateau based on stable isotopes

2021 ◽  
pp. 126314
Author(s):  
Yuzhong Yang ◽  
Qingbai Wu ◽  
Fengjing Liu ◽  
Huijun Jin
Keyword(s):  
Stable Isotopes ◽  
Temporal Trends ◽  
Tibet Plateau ◽  
Thermokarst Lakes ◽  
Qinghai Tibet Plateau

scholarly journals Classification of Stable Isotopes and Identification of Water Replenishment in the Naqu River Basin, Qinghai-Tibet Plateau

Water ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 46 ◽  
Author(s):  
Xi Chen ◽  
Guoli Wang ◽  
Fuqiang Wang
Keyword(s):  
Stable Isotopes ◽  
River Basin ◽  
Source Identification ◽  
Evaluation Model ◽  
Tibet Plateau ◽  
High Status ◽  
Fuzzy Evaluation ◽  
Isotopic Study ◽  
Qinghai Tibet Plateau

The stable isotopic study of the mechanism of runoff replenishment in the Qinghai-Tibet Plateau is a time-consuming and complicated process requiring complex monitoring data and scientific evaluation methods. Based on the data of water stable isotopes (18O and 2H) in the Naqu River basin, the present paper developed a framework of the variable fuzzy evaluation model (VFEM) to provide a method to classify stable isotopes and generalize the source identification of water replenishment by rainfall or snowmelt in the Naqu River basin. The grade eigenvalues of tributaries were ranked from low to high as follows: 1, 1.005, 1.089, 1.151, 1.264, 1.455 and 2.624. Three sets of tributaries were distinguished. The grade eigenvalues of the Najinqu, Bazongqu, Mumuqu, Chengqu and Gongqu Rivers were small, indicating that these tributaries were strongly supplemented by precipitation and snowmelt; the grade eigenvalue of the Zongqingqu River was in the medium range (1.455); the third group included the Mugequ River with a high status value (2.624). This study mainly highlighted the combination of the classification of stable isotopes and plots of δ2H vs. δ18O in the source identification of water replenishment, which will be helpful for studying runoff replenishment and the evolution mechanism in the Qinghai-Tibet Plateau.

Using stable isotopes to illuminate thermokarst lake hydrology in permafrost regions on the Qinghai-Tibet plateau, China

2019 ◽  
Vol 30 (1) ◽  
pp. 58-71 ◽  
Author(s):  
Yuzhong Yang ◽  
Qingbai Wu ◽  
Yandong Hou ◽  
Peng Zhang ◽  
Hanbo Yun ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Tibet Plateau ◽  
Lake Hydrology ◽  
Thermokarst Lake ◽  
Qinghai Tibet Plateau ◽  
Permafrost Regions

scholarly journals Evaluation of Lacustrine Groundwater Discharge, Hydrologic Partitioning, and Nutrient Budgets in a Proglacial Lake in Qinghai-Tibet Plateau: Using <sup>222</sup>Rn and Stable Isotopes

2018 ◽  
Author(s):  
Xin Luo ◽  
Xing Xing Kuang ◽  
Jiu Jimmy Jiao ◽  
Sihai Liang ◽  
Rong Mao ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Primary Productivity ◽  
Nutrient Loading ◽  
Groundwater Discharge ◽  
Tibet Plateau ◽  
Nutrient Budgets ◽  
Proglacial Lakes ◽  
Proglacial Lake ◽  
Qinghai Tibet Plateau ◽  
Hydrologic Partitioning

Abstract. Proglacial lakes are good natural laboratories to investigate groundwater and glacier dynamics under current climate condition and to explore primary productivity under pristine lake status. This study conducted a series of investigations of 222Rn, stable isotopes, nutrients and other hydrogeochemical parameters in Ximen Co Lake, a remote proglacial lake in the east of Qinghai-Tibet Plateau (QTP). A radon mass balance model was used to quantify the lacustrine groundwater discharge (LGD) of the lake, leading to an LGD estimate of 10.3 ± 8.2 mm d−1. Based on the three end member models of stable 18O and Cl−, the hydrologic partitioning of the lake is obtained, which shows that groundwater discharge only accounts for 7.0 % of the total water input. The groundwater derived DIN and DIP loadings constitute 42.9 % and 5.5 % of the total nutrient loading to the lakes, indicating the significance of LGD in delivering disproportionate DIN into the lake. The primary productivity of the lake water is calculated to be 0.41 mmol C m−2 d−1. This study presents the first attempts to evaluate the LGD and hydrologic partitioning in the glacial lake by coupling radioactive and stable isotopic approaches and the findings advance the understanding of nutrient budgets and primary productivity in the proglacial lakes of QTP. The study is also instructional in revealing the hydrogeochemical processes in proglacial lakes elsewhere.

scholarly journals Hydrochemical and Stable Isotope Characteristics of Lake Water and Groundwater in the Beiluhe Basin, Qinghai–Tibet Plateau

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2269
Author(s):  
Jinlong Li ◽  
Wei Wang ◽  
Dahao Wang ◽  
Jiaqi Li ◽  
Jie Dong
Keyword(s):  
Stable Isotope ◽  
Lake Water ◽  
Thermal State ◽  
Saturation Index ◽  
Atmospheric Precipitation ◽  
Mineral Dissolution ◽  
Tibet Plateau ◽  
Hydrological Process ◽  
Thermokarst Lakes ◽  
Qinghai Tibet Plateau

Thermokarst lakes are a ubiquitous landscape feature that impact the thermal state, hydrological process, ecological environment, and engineering stability of the permafrost. This study established the hydrochemistry and stable isotope (δ18O and δD) variations of lake water and groundwater in a typical basin located in the central Qinghai–Tibet Plateau (QTP) of China. The results showed that most water samples could be classified as slightly alkaline, with high levels of salinity and hardness, while the dominant water types were HCO3-CO3 and Cl types. Natural hydrochemical processes, such as mineral dissolution, cation exchange, and groundwater evaporation, had strong impacts on the groundwater chemistry in this region. Dissolution of halite and carbonate minerals causes the major reactions controlling water chemistry in this basin. Additionally, the calculation of the saturation index (SI) values suggested that aragonite, calcite, and dolomite are saturated, while halite is not. Based on the analysis of the stable isotope characteristics, atmospheric precipitation, groundwater, and meltwater from the permafrost are the major sources of thermokarst lakes. Moreover, the evaporation-to-inflow ratio (E/I) indicated that all of the lakes continuously expanded and rapidly developed. Overall, groundwater is an crucial source of lake recharge and its hydrochemical characteristics also have a certain impact on lake water quality.

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