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Author |
Savarino J, Kaiser J, Morin S, Sigman D M, Thiemens M H, |
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Title |
Nitrogen and oxygen isotopic constraints on the origin of atmospheric nitrate in coastal Antarctica
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2007 |
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Atmospheric Chemistry and Physics |
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7 |
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8 |
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1925 -1945 |
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Abstract |
Throughout the year 2001, aerosol samples were collected continuously for 10 to 15 days at the French Antarctic Station Dumont d'Urville DDU) (66 degrees 40' S, 140 degrees 01' E, 40m above mean sea level). The nitrogen and oxygen isotopic ratios of particulate nitrate at DDU exhibit seasonal variations that are among the most extreme observed for nitrate on Earth. In association with concentration measurements, the isotope ratios delineate four distinct periods, broadly consistent with previous studies on Antarctic coastal areas. During austral autumn and early winter March to mid-July), nitrate concentrations attain a minimum between 10 and 30 ng m(-3) referred to as Period 2). Two local maxima in August (55 ng m(-3)) and November/December (165 ng m(-3)) are used to assign Period 3 (mid-July to September) and Period 4 October to December). Period 1 January to March) is a transition period between the maximum concentration of Period 4 and the background concentration of Period 2. These seasonal changes are reflected in changes of the nitrogen and oxygen isotope ratios. During Period 2, which is characterized by background concentrations, the isotope ratios are in the range of previous measurements at midlatitudes: delta O-18(vsmow)=(77.2 8.6)parts per thousand; Delta O-17=(29.8 4.4)parts per thousand; delta N-15(air)=(- 4.4 5.4)parts per thousand mean one standard deviation). Period 3 is accompanied by a significant increase of the oxygen isotope ratios and a small increase of the nitrogen isotope ratio to delta O-18(vsmow)=( 98.8 13.9)parts per thousand; Delta O-17=(38.8 4.7)parts per thousand and delta N-15(air)=(4.3 8.20 parts per thousand). Period 4 is characterized by a minimum N-15/N-14 ratio, only matched by one prior study of Antarctic aerosols, and oxygen isotope ratios similar to Period 2: delta O-18(vsmow)=(77.2 7.7)parts per thousand; Delta O-17=(31.1 3.2)parts per thousand; delta N-15(air)=(- 32.7 8.4)parts per thousand. Finally, during Period 1, isotope ratios reach minimum values for oxygen and intermediate values for nitrogen: delta O-18(vsmow)= 63.2 2.5 parts per thousand; Delta O-17= 24.0 1.1 parts per thousand; delta N-15(air)=- 17.9 4.0 parts per thousand). Based on the measured isotopic composition, known atmospheric transport patterns and the current understanding of kinetics and isotope effects of relevant atmospheric chemical processes, we suggest that elevated tropospheric nitrate levels during Period 3 are most likely the result of nitrate sedimentation from polar stratospheric clouds (PSCs), whereas elevated nitrate levels during Period 4 are likely to result from snow re-emission of nitrogen oxide species. We are unable to attribute the source of the nitrate during periods 1 and 2 to local production or long-range transport, but note that the oxygen isotopic composition is in agreement with day and night time nitrate chemistry driven by the diurnal solar cycle. A precise quantification is difficult, due to our insufficient knowledge of isotope fractionation during the reactions leading to nitrate formation, among other reasons.
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Supercooled liquid water clouds observed over Dome C, Antarctica: temperature sensitivity and cloud radiative forcing |
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2024 |
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Atmospheric Chemistry and Physics |
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24 |
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1 |
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613-630 |
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910 |
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Cynthia H. Whaley, Kathy S. Law, Jens Liengaard Hjorth, Henrik Skov, Stephen R. Arnold, Joakim Langner, Jakob Boyd Pernov, Garance Bergeron, Ilann Bourgeois, Jesper H. Christensen, Rong-You Chien, Makoto Deushi, Xinyi Dong, Peter Effertz, Gregory Faluvegi, Mark Flanner, Joshua S. Fu, Michael Gauss, Greg Huey, Ulas Im, Rigel Kivi, Louis Marelle, Tatsuo Onishi, Naga Oshima, Irina Petropavlovskikh, Jeff Peischl, David A. Plummer, Luca Pozzoli, Jean-Christophe Raut, Tom Ryerson, Ragnhild Skeie, Sverre Solberg, Manu A. Thomas, Chelsea Thompson, Kostas Tsigaridis, Svetlana Tsyro, Steven T. Turnock, Knut von Salzen, David W. Tarasick |
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Arctic tropospheric ozone: assessment of current knowledge and model performance |
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2023 |
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Atmospheric Chemistry and Physics |
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23 |
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1 |
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637-661 |
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1215 |
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8507 |
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Eleftherios Ioannidis, Kathy S. Law, Jean-Christophe Raut, Louis Marelle, Tatsuo Onishi, Rachel M. Kirpes, Lucia M. Upchurch, Thomas Tuch, Alfred Wiedensohler, Andreas Massling, Henrik Skov, Patricia K. Quinn, Kerri A. Pratt |
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Modelling wintertime sea-spray aerosols under Arctic haze conditions |
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2023 |
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Atmospheric chemistry and physics |
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23 |
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10 |
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5641-5678 |
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1215 |
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8504 |
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14 years of lidar measurements of polar stratospheric clouds at the French Antarctic station Dumont d'Urville |
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2023 |
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Atmospheric chemistry and physics |
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23 |
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1 |
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431-451 |
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209 |
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8491 |
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Model evaluation of short-lived climate forcers for the Arctic Monitoring and Assessment Programme: a multi-species, multi-model study |
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2022 |
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Atmospheric Chemistry and Physics |
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22 |
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9 |
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5775-5828 |
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1215 |
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8506 |
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Photolytic modification of seasonal nitrate isotope cycles in East Antarctica |
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2022 |
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Atmospheric Chemistry and Physics |
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22 |
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24 |
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15637-15657 |
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1177 |
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8583 |
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Author |
Yanzhi Cao, Zhuang Jiang, Becky Alexander, Jihong Cole-Dai, Joel Savarino, Joseph Erbland, Lei Geng |
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Title |
On the potential fingerprint of the Antarctic ozone hole in ice-core nitrate isotopes: a case study based on a South Pole ice core |
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2022 |
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Atmospheric chemistry and physics |
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22 |
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20 |
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13407-13422 |
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1177 |
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8455 |
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Ice fog observed at cirrus temperatures at Dome C, Antarctic Plateau |
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2022 |
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Atmospheric Chemistry and Physics |
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22 |
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19 |
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12857-12872 |
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8769 |
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Summer variability of the atmospheric NO2 : ?NO ratio at Dome C on the East Antarctic Plateau |
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2022 |
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Atmospheric Chemistry and Physics |
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22 |
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18 |
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12025-12054 |
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1177 |
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8591 |
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