Knowledge of moisture sources is of great significance for the understanding of groundwater recharge and hydrological cycle. However, it is often difficult to identify the moisture sources and evolution especially in the areas with complex climate system. Isotopes in groundwater that acts as a climate archive provide a unique perspective on the moisture sources and evolution. In this study, the stable isotopes (H, O) of precipitation and groundwater, radioactive isotope (C) of groundwater, water vapor trajectory modeling (HYSPLIT models) and d-excess based on mass balance model were employed to reveal the groundwater origin, moisture source and evolution in the northeastern Qaidam Basin, northeast Tibetan Plateau, China. The stable isotopic compositions indicate that the precipitation in the mountainous areas is the main origin of groundwater. The spatiotemporal variation of groundwater d-excess together with HYSPLIT modeling suggest that the moisture sources in the northeastern Qaidam Basin have been controlled by the Westerlies and did not alter obviously with time, whereas Delingha with relatively low elevation is influenced by both the Westerlies and local recycled moisture. More than 80 % water vapor derives from the northwest of study area for the plain and mountainous area, except for the mountainous area of Delingha, where approximately 23 % water vapor originates from the surface water evaporation in the plain area. The water vapor with high d-excess formed in the plain area is transported to the mountainous area and mixed with advected water vapor, resulting in the large d-excess of groundwater in Delingha. The moisture recycling fraction in precipitation for the mountainous area of Delingha is estimated to be about 2.0 % by using d-excess-based mass balance model. The results of the study could be helpful to the understanding of hydrological cycle of the area and elsewhere.
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http://dx.doi.org/10.1016/j.scitotenv.2022.160981 | DOI Listing |
Chem Commun (Camb)
January 2025
Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India.
Nickel catalysis has experienced a renaissance over the past two decades, driven by its ability to access diverse oxidation states (0 to +4) and unique reactivity. This review consolidates the advancements in nickel chemistry, providing an overview of ligands that stabilize specific nickel oxidation states. The stability, reactivity, and catalytic applications of Ni sources, including generation from air- and moisture-stable Ni precursors, are discussed, along with the roles of Ni and Ni intermediates in catalytic cycles.
View Article and Find Full Text PDFJ Ophthalmol
January 2025
Departments of Genetics, Microbiology and Immunology, Center for Research on Harmful Effects of Biological and Chemical Hazards, Faculty of Medical Sciences University of Kragujevac, 69 Svetozara Markovica Street, Kragujevac 34000, Serbia.
Severe dry eye disease (DED) is an inflammatory condition characterized by a lack of sufficient moisture or lubrication on the surface of the eye, significantly impacting the quality of life and visual function. Since detrimental immune response is crucially responsible for the development and aggravation of DED, therapeutic agents which modulate phenotype and function of eye-infiltrated inflammatory immune cells could be used for the treatment of severe DED. Due to their potent immunomodulatory properties, mesenchymal stem cells (MSCs) represent potentially new remedies for the treatment of inflammatory eye diseases.
View Article and Find Full Text PDFEcol Evol
January 2025
Department of Plant Biology and Ecology, College of Life Science Nankai University Tianjin P. R. China.
In the context of global climate change, exploring how plant adaptation and responses to drought vary among different regions are crucial to understanding and predicting its geographic distribution. In this study, to explore the drought adaptation and responses of the dominant species in the semi-arid Eurasian Steppes and their differences among the different regions in terms of growth, physiology, and RNA-seq transcriptome, was chosen as the study material, and a seed source (three regions: eastern, middle, and western regions) × soil moisture treatment (three treatments: control, light drought, and heavy drought) two-factor experiment was conducted. (1) Four growth traits for individuals from the western region were significantly lower than those from the other two regions.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
January 2025
Department of Aquatic Ecology, Netherlands Institute of Ecology, Wageningen 6708 PB, The Netherlands.
Arctic ecosystems are affected by accelerated warming as well as the intensification of the hydrologic cycle, yet understanding of the impacts of compound climate extremes (e.g., simultaneous extreme heat and rainfall) remains limited, despite their high potential to alter ecosystems.
View Article and Find Full Text PDFFood Sci Nutr
January 2025
Department of Horticultural Sciences, Faculty of Applied Sciences Cape Peninsula University of Technology Bellville South Africa.
Climate change, drought, and soil salinization present huge limitations to global agricultural output, which threatens food security. This necessitates the cultivation and domestication of wild edible halophytes as alternatives to mainstream food crops, especially in arid and semi-arid regions. is one of the under-researched and underutilized edible halophytes native to South Africa.
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