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- W4308741570 abstract "• Tibetan glacier runoffs contain a low concentration of nitrate. • Nitrification-derived NO 3 – was the major source of glacier runoff NO 3 – . • Microbial nitrification process may have occurred in subglacial environments and glacial foreland soils. • The denitrification signal was not obvious in glacial runoff. Glacier and Ice sheets are the largest reservoir of freshwater on Earth. Global warming accelerates glacier retreat and enhances the volume of glacier runoff, which heavily impacts the geochemical cycling in downstream ecosystems. Nitrate is the main form of nitrogen in glacier runoff, while little is known about its source in high-altitude regions. Here, we measured complete nitrate isotopes (δ 15 N-NO 3 – , δ 18 O-NO 3 – and Δ 17 O-NO 3 – ) in ten geographically separated glacier runoffs on the Tibetan Plateau (TP) with altitudes ranging from 2,409 to 5,564 m. The average NO 3 – concentration in glacier runoff was 1.0 ± 0.7 mg·L -1 , which is lower than that in the river and lake of the TP. This indicates that the glacier runoff on the TP was less influenced by human activities. Nitrification-derived NO 3 – was the major source of glacier runoff NO 3 – , which ranged from 57 % to 90 %. The nitrification process could occur in subglacial environments and glacial foreland soils. Furthermore, denitrification process may not occur in glacier runoff over the TP. Our work may shed light on the nitrogen cycle in high-altitude areas." @default.
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- W4308741570 date "2022-11-01" @default.
- W4308741570 modified "2023-10-16" @default.
- W4308741570 title "High proportional nitrification-derived nitrate in glacier runoffs on the Tibetan Plateau indicated by triple oxygen isotopes of nitrate" @default.
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- W4308741570 doi "https://doi.org/10.1016/j.jhydrol.2022.128632" @default.
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