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• W4200553729 endingPage "152692" @default.
• W4200553729 startingPage "152692" @default.
• W4200553729 abstract "Atmospheric nitrogen deposition is a unique source of bioavailable nitrogen for ecosystems in remote regions, and has vital impacts on ecological processes. Understanding variations of atmospheric nitrogen deposition in these regions remains challenging due to a lack of observations. Ice cores contain records of nitrogen species of nitrate (NO3-) and ammonium (NH4+), hence provide valuable long-term data to study past variations of atmospheric nitrogen deposition. In this study, we present an annually resolved record of NH4+ and NO3- over the past millennium, derived from the Zangser Kangri (ZK) ice core in the central Tibetan Plateau. The concentration peaks of NH4+ and NO3- coincide with those of Ca2+ (a dust tracer), indicating that variation of nitrogen species in the ZK ice core is largely driven by dust activities. An EOF analysis for all chemical species (Cl-, SO42-, NO3-, Na+, NH4+, K+, Mg2+, Ca2+) reveals significant but separate loadings of NH4+ and NO3- on EOF 2, suggesting an additional source of nitrogen, likely from biogenic emissions of terrestrial ecosystems. Over the past millennium, the EOF 2 series has relatively high values around 1300 CE and 1600 CE, and has increased significantly since the Industrial Revolution. These variations are likely driven by temperature-dependent biogenic emissions on the Tibetan Plateau. Analyses of seasonal air mass backward trajectories and wind fields find that the chemical concentrations in the ZK ice core are mostly influenced by the westerly, but South Asia summer monsoon plays an important role in the transport of nitrogen species generated from biogenic emissions. This is further confirmed by the significant correlation between EOF 2 series and the South Asian summer monsoon index. This study provides new insight into the preindustrial sources, natural variabilities and major drivers of nitrogen deposition on the Tibetan Plateau." @default.
• W4200553729 created "2021-12-31" @default.
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• W4200553729 date "2022-03-01" @default.
• W4200553729 modified "2023-10-12" @default.
• W4200553729 title "Ice-core based assessment of nitrogen deposition in the central Tibetan Plateau over the last millennium" @default.
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• W4200553729 doi "https://doi.org/10.1016/j.scitotenv.2021.152692" @default.
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