Regional Characteristics and Impact Factors of Change in Terrestrial Water Storage in Northwestern China From 2002 to 2020

Yin, Jigang; Wei, Jiahua; Li, Qiong

doi:10.1109/jstars.2022.3224864

Cited by 2 publications

(4 citation statements)

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“…Thus, the differences in hydrochemical composition are primarily due to variations in the aquifer's lithology: (1) in the southern region, the influence of salt rock dissolution and oilfield water is more significant, while in the northern mountainous areas, the development of carbonate rock joints and fissures is more pronounced, indicating a more significant impact due to carbonate weathering; (2) the connectivity of the aquifers in the floodplain areas results in different groundwater recharge mechanisms, with direct upstream groundwater recharge in the south and vertical top-supported cross-flow recharge in the north, resulting in relatively lower potentials for evaporation.…”

Section: Number Watershedmentioning

confidence: 99%

“…The inland arid basins in northwest China face a scarcity of freshwater resources with respect to uneven spatial and temporal distributions, severe desertification, and fragile ecological environments. Since the 21st century, climate warming has led to increased precipitation in the northwestern arid regions, resulting in varying changes in terrestrial water storage [1]. This has amplified hydrological fluctuations and uncertainties in water resources [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The Qaidam Basin (QB) is a typical inland plateau basin, and due to its arid climate, the river-lake system is highly susceptible to seasonal changes and precipitation. Climate warming has brought about changes in regional hydrological cycles, resulting in increased precipitation, river discharge and lake areas [4], and expanded land water storage [1,5], while also causing the freshening of resource-based lakes [6]. The spatiotemporal variations in hydrochemistry and isotopes are primarily constrained by factors such as geological structure, lithogenic origins, topography, hydrology, and meteorology, yet the mechanisms underlying their influences remain unclear.…”

Section: Introductionmentioning

confidence: 99%

“…The chemical characteristics of salt lake water in the QB are closely related to their material sources, which primarily include four types: (1) It is believed that the salt content in lakes is a result of long-term weathering, leaching, transportation, dissolution, and precipitation processes caused by continuous contributions from surrounding weathering and leaching, as well as from groundwater and surface water [15]. For example, the source of potassium is attributed to the widespread distribution of potassium-containing rocks around the basin [16].…”

Section: Introductionmentioning

confidence: 99%

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Hydrochemical and Isotopic Characteristics and the Spatiotemporal Differences of Surface Water and Groundwater in the Qaidam Basin, China

Yang,

Wei,

Shi

2023

Water

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In the context of climate change, precipitation and runoff in the arid inland basins of northwest China have undergone significant changes. The Qaidam Basin (QB) is a typical highland arid inland area. Understanding the spatial and temporal variations in surface water and groundwater chemistry and isotopes, as well as their causes, is crucial for future water resource management and ecological protection. Samples of river, lake, and groundwater, as well as others, were collected and tested in five typical watersheds in the summer and winter. The hydrochemistry and isotopic spatiotemporal differences in various water bodies were studied using the significant difference method, water vapor flux models, hydrochemistry, isotopes, and other methods for cause analyses. The results indicate the following: (1) There are differences in hydrochemistry between the southern and northern basins because the southern basin is more influenced by the dissolution of salt rocks and evaporation, whereas the northern basin is mainly affected by carbonate weathering. (2) The enrichment of δD and δ18O in the northern basin gradually increases from west to east, while in the southern basin, it is the opposite. This is because the southern basin receives a larger contribution of water vapor from the mid-latitude westerlies, while the northern basin primarily relies on local evaporation as its water vapor source. (3) Significant differences are observed in the total dissolved solids (TDS) and hydrochemical types of river water and groundwater between the summer and winter due to higher rates of rock weathering and evaporation in the summer. (4) The more pronounced seasonal differences in hydrogen and oxygen stable isotopes in the southern basin are due to higher rates of internal water vapor circulation in the summer. (5) The similarity in characteristics between river water and groundwater is the result of strong exchanges between river water and groundwater from piedmonts to terminals. The spatiotemporal heterogeneity of terminal lakes is attributed to the accumulation of salts and groundwater replenishment from other sources.

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Section: Number Watershedmentioning

confidence: 99%