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• W4318204972 endingPage "161896" @default.
• W4318204972 startingPage "161896" @default.
• W4318204972 abstract "Silicate weathering is critical to sustain our habitable planet. Lithium (Li) isotopes enable us to investigate the nature of silicate weathering. A number of riverine Li isotope (δ7Lirw) investigations have been made from polar to equatorial terrains, but there remains no consensus about the controlling mechanisms of both weathering and δ7Lirw. Here we investigated δ7Lirw response to climate by collecting weekly river water samples in a small catchment (the Buha River within the Lake Qinghai basin) on the northeastern Tibetan Plateau, with stable tectonic, lithology, and topography. In the hydrology year of 2007 of the Buha River, we find that during the dry seasons, δ7Lirw ratios show temperature dependency typically, when the groundwater fed the river. During the monsoon seasons, δ7Lirw were obviously lower than the temperature dependency predicted values, when abundant rock dissolved and thereby fresh Li release into rivers. We propose that the hydrology and temperature dependency together play important roles in regulating δ7Lirw ratios in such an alpine small catchment. The mechanism is that long residence time facilitates the equilibrium chemical and Li isotopic fractionation during the dry seasons, so a temperature dependency of δ7Lirw is achieved. In contrast, rapid erosion and weathering contribution of fresh rock-like δ7Li to river water would significantly decrease δ7Lirw ratios during the monsoon seasons. This hypothesis can better interpret previously reported data of seasonal δ7Lirw variation, as a superposition between temperature dependency and hydrology regulation on silicates weathering in the small catchments besides tectonics." @default.
• W4318204972 created "2023-01-27" @default.
• W4318204972 creator A5026506130 @default.
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• W4318204972 creator A5056864085 @default.
• W4318204972 creator A5065256485 @default.
• W4318204972 date "2023-04-01" @default.
• W4318204972 modified "2023-09-27" @default.
• W4318204972 title "Li isotopic seasonality in a small catchment at the northeastern Tibetan Plateau: Roles of hydrology and temperature dependency" @default.
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• W4318204972 doi "https://doi.org/10.1016/j.scitotenv.2023.161896" @default.
• W4318204972 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36709901" @default.
• W4318204972 hasPublicationYear "2023" @default.
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