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• W2069796316 abstract "In order to estimate past changes in atmospheric NO x concentration, nitrate, an oxidation product of NO x , has often been measured in polar ice cores. In the frame of the European Project for Ice Coring in Antarctica (EPICA), a high‐resolution nitrate record was obtained by continuous flow analysis (CFA) of a new deep ice core drilled at Dome C. This record allows a detailed comparison of nitrate with other chemical trace substances in polar snow under different climatic regimes. Previous studies showed that it would be difficult to make firm conclusions about atmospheric NO x concentrations based on ice core nitrate without a better understanding of the factors controlling NO 3 − deposition and preservation. At Dome C, initially high nitrate concentrations (over 500 ppb) decrease within the top meter to steady low values around 15 ppb that are maintained throughout the Holocene ice. Much higher concentrations (averaging 53 ppb) are found in ice from the Last Glacial Maximum (LGM). Combining this information with data from previous sampling elsewhere in Antarctica, it seems that under climatic conditions of the Holocene, temperature and accumulation rate are the key factors determining the NO 3 − concentration in the ice. Furthermore, ice layers with high acidity show a depletion of NO 3 − , but higher concentrations are found before and after the acidity layer, indicating that NO 3 − has been redistributed after deposition. Under glacial conditions, where NO 3 − shows a higher concentration level and also a larger variability, non‐sea‐salt calcium seems to act as a stabilizer, preventing volatilization of NO 3 − from the surface snow layers." @default.
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• W2069796316 date "2000-08-01" @default.
• W2069796316 modified "2023-09-30" @default.
• W2069796316 title "Factors controlling nitrate in ice cores: Evidence from the Dome C deep ice core" @default.
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• W2069796316 doi "https://doi.org/10.1029/2000jd900264" @default.
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