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- W3147468044 abstract "Atmospheric samples and surface seawater collected on a Chinese Antarctic Research Expedition (CHINARE) transect are used to investigate sources and production of nitrate ( NO 3 − ) in the atmosphere and its contribution to the surface NO 3 − pool in the ocean. Most atmospheric NO 3 − is concentrated on intermediate size particles, and much higher concentrations were observed in the northern hemisphere than in the high southern latitudes. Isotopes of NO 3 − ( δ 15 N , δ 18 O and Δ 17 O ) suggest that elevated atmospheric NO 3 − in coastal areas was associated with human activities, while NO 3 − in the high southern latitudes tends to be influenced by precursor Antarctic snowpack emissions driven by photolysis. In general, no clear association was found between the isotopes of surface seawater and atmospheric NO 3 − , suggesting that the ocean is unlikely to be an important direct source of atmospheric NO x on this transect. A significant linear relationship between δ 18 O and Δ 17 O of NO 3 − is used to interpret important pathways for NO 3 − production. In the tropics, >59% of atmospheric NO 3 − is produced via OH oxidation of NO 2 , while the elevated oxygen isotopic ratios ( δ 18 O and Δ 17 O ) in the high southern latitudes suggest increased NO 3 − production via BrO and/or DMS pathways assuming a minor contribution of the N 2 O 5 channel. In surface seawater, high NO 3 − concentrations are present in the coastal areas and in the Southern Ocean. In coastal areas of China, positive Δ 17 O values in seawater NO 3 − (1.7 ± 1.0‰) provide direct evidence of uncycled atmospheric deposition contribution, with a calculated contribution of at least 2-3% to total surface NO 3 − . A Δ 17 O = 0 was found everywhere else in seawater, suggesting that atmospheric deposition has a minimal presence in the surface NO 3 − pool. Near Antarctica, deposition of atmospheric NO 3 − with extremely low δ 15 N ( < − 30 ‰ ) could lower δ 15 N found in sea ice, and this process could be isotopically important to evaluate nitrogen cycling in sea ice. • Concentration and isotopic composition of NO 3 − show notable latitudinal gradients. • Atmospheric NO 3 − is mainly produced via OH oxidation in the tropics. • The high southern latitudes show an increased importance of BrO or DMS pathways. • Positive Δ 17 O of seawater NO 3 − is found in coastal waters and Δ 17 O ≈ 0 in other areas. • Atmospheric deposition near Antarctica can lower δ 15 N of NO 3 − in sea ice." @default.
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- W3147468044 date "2021-06-01" @default.
- W3147468044 modified "2023-10-18" @default.
- W3147468044 title "Using stable isotopes to distinguish atmospheric nitrate production and its contribution to the surface ocean across hemispheres" @default.
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- W3147468044 doi "https://doi.org/10.1016/j.epsl.2021.116914" @default.
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