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Author |
Tison J.L., Souchez R., Wolff E., Moore J.C., Legrand M. & De Angelis M. |
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Title |
Is a periglacial biota responsible for enhanced dielectric response in banal ice from the greenland Ice Core Project ice core? |
Type |
Journal Article |
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Year |
1998 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
103 |
Issue  |
d15 |
Pages |
18885-18894 |
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322 |
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0148-0227 |
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yes |
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Call Number |
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Serial |
1892 |
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Author |
Sciare J, Favez O, Sarda-Estve R, Oikonomou K, Cachier H, Kazan V, |
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Title |
Long-term observations of carbonaceous aerosols in the Austral Ocean atmosphere: Evidence of a biogenic marine organic source
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Type |
Journal Article |
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Year |
2009 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
114 |
Issue |
D15 |
Pages |
D15302 - |
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Keywords |
organic aerosols, black carbon, biogenic aerosols, Austral Ocean, chlorophyll a, 0305 Atmospheric Composition and Structure: Aerosols and particles, 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry, 3339 Atmospheric Processes: Ocean/atmosphere interactions, |
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Abstract |
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Programme |
414;415;416 |
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Thesis |
Bachelor's thesis |
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Publisher |
AGU |
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ISSN |
0148-0227 |
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yes |
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Call Number |
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Serial |
1819 |
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Title |
Oxidant Production over Antarctic Land and its Export (OPALE) project: An overview of the 20102011 summer campaign
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Type |
Journal Article |
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Year |
2012 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
117 |
Issue |
D15 |
Pages |
D15307- |
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Keywords |
Antarctic photochemistry, atmospheric oxidants, hydroxyl radicals, nitrous acid, 0315 Biosphere/atmosphere interactions, 0365 Troposphere: composition and chemistry, 0368 Troposphere: constituent transport and chemistry, |
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Abstract |
This paper summarizes the objectives and setting of the OPALE (Oxidant Production over Antarctic Land and its Export) project during summer 2010/2011 at Dumont d'Urville. The primary goal of the campaign is to characterize the oxidizing environment of the atmospheric boundary layer along the coast of East Antarctica. A summary of the relevant field chemical measurements is presented including the carbon monoxide and ammonia records that are used here to identify local influences due to station activities and penguin emissions. An overview of the basic meteorological conditions experienced by the site is presented including the results from the trajectory/dispersion model FLEXPART to highlight which types of air mass were sampled (marine boundary layer versus continental Antarctic air). The results of the FLEXPART analysis demonstrate that high ozone levels and related changes in the OH concentrations are associated with the transport of continental air to DDU. Finally, three companion papers are introduced. A first paper is dedicated to the impact of local penguin emissions on the atmospheric budget of several oxygenated volatile organic compounds. The second paper reports on HONO levels that were measured for the first time in Antarctica by using the long path absorption photometer (LOPAP) technique. Finally, in a third paper, major findings on the HOx levels are detailed, leading to the overall conclusion that the photochemistry at coastal East Antarctica is strongly driven by an efficient HOx chemistry compared to the situation at other coastal Antarctic regions.
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Programme |
414 |
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Edition |
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ISSN |
2156-2202 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
3822 |
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Author |
Jourdain Bruno, Preunkert Susanne, Cerri Omar, Castebrunet Hlne, Udisti Roberto, Legrand Michel, |
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Title |
Year-round record of size-segregated aerosol composition in central Antarctica (Concordia station): Implications for the degree of fractionation of sea-salt particles
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Type |
Journal Article |
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Year |
2008 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
113 |
Issue |
D14 |
Pages |
D14308 - |
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Keywords |
Central Antarctica, size segregated aerosol, sea-salt fractionation, 0305 Atmospheric Composition and Structure: Aerosols and particles, 0345 Atmospheric Composition and Structure: Pollution: urban and regional, 4801 Oceanography: Biological and Chemical: Aerosols, 4906 Paleoceanography: Aerosols, 0368 Atmospheric Composition and Structure: Troposphere: constituent transport and chemistry, 9310 Geographic Location: Antarctica, 4207 Oceanography: General: Arctic and Antarctic oceanography, 3300 Atmospheric Processes, |
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Abstract |
The origin of sea-salt aerosol that reaches the high Antarctic plateau and is trapped in snow and ice cores remains still unclear. In particular, the respective role of emissions from the open ocean versus those from the sea-ice surface is not yet quantified. To progress on this question, the composition of bulk and size-segregated aerosol was studied in 2006 at the Concordia station (75S, 123E) located on the high Antarctic plateau. A depletion of sulfate relative to sodium with respect to the seawater composition is observed on sea-salt aerosol reaching Concordia from April to September. That suggests that in winter, when the sea-salt atmospheric load reaches a maximum, emissions from the sea-ice surface significantly contribute to the sea-salt budget of inland Antarctica.
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Programme |
414;903;1181 |
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Thesis |
Bachelor's thesis |
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Publisher |
AGU |
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ISSN |
0148-0227 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
1693 |
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Author |
H. W. Jacobi, D. Voisin, J. L. Jaffrezo, J. Cozic, T. A. Douglas |
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Title |
Chemical composition of the snowpack during the OASIS spring campaign 2009 at Barrow, Alaska |
Type |
Journal |
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Year |
2012 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
117 |
Issue |
D14 |
Pages |
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Keywords |
Alaska Arctic Barrow Chemistry Snow |
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Abstract |
The chemical composition of the seasonal snowpack was determined close to Barrow, an Arctic coastal location in northern Alaska. One hundred and twelve samples of different snow types including fresh snow, surface hoar, diamond dust, blowing snow, rounded snow grains, and depth hoar were collected and analyzed for major sea salt components, bromide, and nitrate. Sodium, chloride, sulfate, and potassium are mainly introduced into the snowpack by the deposition of sea salt, while magnesium and calcium result from a combination of sea salt and dust. Sulfate was strongly depleted in most samples compared to other sea salt components. This is attributed to the precipitation of mirabilite in newly formed sea ice and frost flowers that leads to an efficient fractionation of sulfate. Uptake of volatile but soluble species from the gas phase also contributed to the observed chloride, sulfate, and nitrate in the snow. However, for chloride and sulfate the input from the marine sources was overwhelming and the uptake from the gas phase was only visible in the samples with low concentrations like fresh snow, diamond dust, and surface hoar. Nitrate concentrations in the snowpack were less variable and for aged snow nitrate was related to the specific surface area of the snow indicating the adsorption of nitric acid can be an important nitrate source in the aged snow. Bromide was also introduced into the snowpack from marine sources, but due to its high reactivity it was partly transferred back to the atmosphere in the form of reactive species. The result of these processes was evident in bromide concentrations, which were both enriched and depleted at the snowpack surface while deeper layers were mostly depleted. Blowing snow also exhibited a depleted bromide composition. For all compounds except nitrate, many depth hoar samples exhibited the greatest concentrations, probably as a result of higher input earlier in the season as well as increases due to the sublimation of water during the metamorphism of the snow. |
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Programme |
1017 |
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ISSN |
2156-2202 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8163 |
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Author |
Malaize B., Paillard D., Jouzel J. & Raynaud D. |
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Title |
The Dole effect over the last two glacial-interglacial cycles. |
Type |
Journal Article |
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Year |
1999 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
104 |
Issue |
d12 |
Pages |
14199-14208 |
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Abstract |
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Programme |
159 |
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ISSN |
0148-0227 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
752 |
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Author |
Williams, J.; Gros, V.; Bonsang, B.; Kazan, V. |
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Title |
HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island |
Type |
Journal Article |
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Year |
2001 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
106 |
Issue |
d12 |
Pages |
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Abstract |
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Programme |
415 |
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Publisher |
American Geophysical Union |
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0148-0227 |
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yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5600 |
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Author |
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Title |
Measurements of OH and RO2 radicals at the coastal Antarctic site of Dumont d'Urville (East Antarctica) in summer 20102011
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Type |
Journal Article |
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Year |
2012 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
117 |
Issue |
D12 |
Pages |
D12310- |
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Keywords |
Antarctic photochemistry, Atmospheric oxidants, Hydroxyl radicals, 0322 Constituent sources and sinks, 0365 Troposphere: composition and chemistry, 0368 Troposphere: constituent transport and chemistry, |
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Abstract |
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Programme |
414 |
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ISSN |
2156-2202 |
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Approved |
yes |
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Call Number |
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Serial |
3816 |
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Author |
Ricaud P., Monnier E., Goutail F., Pommereau J.P., David C., Godin S., Froidevaux L., Waters J.W., Mergenthaler J., Roche A.E., Pumphrey H. & Chippeerfield M.P. |
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Title |
Stratosphere over Dumont d'Urville, Antarctica, in winter 1992. |
Type |
Journal Article |
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Year |
1998 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
103 |
Issue |
d11 |
Pages |
13267-13284 |
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Abstract |
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Programme |
904 |
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ISSN |
0148-0227 |
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yes |
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Call Number |
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Serial |
2287 |
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Author |
Risi Camille, Landais Amaelle, Bony Sandrine, Jouzel Jean, Masson-Delmotte Valrie, Vimeux Franoise, |
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Title |
Understanding the 17O excess glacial-interglacial variations in Vostok precipitation
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Type |
Journal Article |
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Year |
2010 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
115 |
Issue |
D10 |
Pages |
D10112 - |
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Keywords |
17 O excess, ice core isotopic composition, surface relative humidity, 4932 Paleoceanography: Ice cores, 0454 Biogeosciences: Isotopic composition and chemistry, 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry, 1655 Global Change: Water cycles, 3344 Atmospheric Processes: Paleoclimatology, |
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Abstract |
Combined measurements of δ18O, δ17O, and δD in ice cores, leading to d excess and 17O excess, are expected to provide new constraints on the water cycle and past climates. We explore different processes, both in the source regions and during the poleward transport, that could explain the 17O excess increase by 20 per meg observed from the Last Glacial Maximum (LGM) to Early Holocene (EH) at the Vostok station. Using a single-column model over tropical and subtropical oceans, we show that the relative humidity at the surface is the main factor controlling 17O excess in source regions. Then, using a Rayleigh-type model, we show that the 17O excess signal from the source region is preserved in the polar snowfall, contrary to d excess. Evaporative recharge over mid and high latitudes and δ18O seasonality in polar regions can also affect the Vostok 17O excess but cannot account for most of the 20 per meg deglacial increase from LGM to EH. On the other hand, a decrease of the relative humidity at the surface (rhs) by 8 to 22% would explain the observed change in 17O excess. Such a change would not necessarily be incompatible with a nearly unchanged boundary layer relative humidity, if the surface thermodynamic disequilibrium decreased by 4C. Such a change in rhs would affect source and polar temperatures reconstructions from δ18O and d excess measurements, strengthening the interest of 17O excess measurements to better constrain such changes.
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Programme |
458 |
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Publisher |
AGU |
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ISSN |
0148-0227 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
201 |
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