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. (2003). The attenuation of fast atmospheric CH4 variations recorded in polar ice cores. Geophysical research letters, 30(11), 25–1.
Abstract: To reconstruct fast atmospheric trace gas variations from polar ice cores it has to be considered that their amplitudes are attenuated during the enclosure process in the ice. Relevant processes for the attenuation are the molecular diffusion in the open pores of the firn column and the gradual bubble close off in the depth of the transition from firn to ice. These processes depend mainly on temperature and accumulation rate and lead e.g. to a strong attenuation for cold sites with low accumulation rates. With a diffusion and enclosure model it is possible to calculate the attenuation for a single event and to compare ice core records from different sites. We investigate the atmospheric methane (CH4) variation during the cold event 8200 years ago and calculate that its amplitude as recorded in the EPICA Dome C ice core is attenuated to a magnitude between 34% and 59%.
Programme: 960
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Savarino, J.; Romero, A.; Cole-Dai, J.; Bekki, S.; Thiemens, M.H. (2003). UV induced mass-independent sulfur isotope fractionation in stratospheric volcanic sulfate. Geophysical research letters, 30.
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Genthon, C.; Cosme, E. (2003). Intermittent signature of ENSO in west-Antarctic precipitation. Geophysical research letters, 30.
Abstract: Precipitation data from the new ERA40 reanalyses and from a 200-year simulation confirm a robust main mode of precipitation variability in west Antarctica. An intermittently strong ENSO signature is found in this mode. However, high correlation with ENSO indices appears infrequent. Thus, the high correlation found in ERA40, and previously in other chronologically realistic data, in the late 1980s and the 1990s may not be expected to last. Unlike previously suggested by others, the sign of the correlation between ENSO indices and west Antarctic precipitation, when significant, does not appear to change in time: Precipitation variability at the ENSO pace in the Bellingshausen-Weddell (Ross-Amunsden) region is consistently in phase (phase opposition, respectively) with the Southern Oscillation Index. This is consistent with a tropospheric wave train connecting the tropical Pacific and west Antarctic regions, which modulates in phase opposition the advection of air and moisture in the 2 regions.
Keywords: 3349 Meteorology and Atmospheric Dynamics: Polar meteorology; 3354 Meteorology and Atmospheric Dynamics: Precipitation; 1620 Global Change: Climate dynamics; 1655 Global Change: Water cycles; 9310 Information Related to Geographic Region: Antarctica
Programme: 411
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Priestley, K.; Debayle, E. (2003). Seismic evidence for a moderately thick lithosphere beneath the Siberian Platform. Geophysical research letters, 30.
Abstract: We have built a Sv-wavespeed tomographic model for the upper mantle beneath the Siberian platform and surrounding region derived from the analysis of more than 13,000 fundamental and higher mode regional waveforms. The dense path coverage and rich higher mode content of the data allow building an upper mantle image with an horizontal resolution of a few hundred kilometers extending to ?400 km depth. The high velocity, upper mantle lid or seismic lithosphere is ?200 km thick beneath most of the Siberian platform but may extend to ?250 km depth beneath small areas. A high velocity seismic lid also underlies a large region west of the Siberian platform. Our observation of a ?200 thick seismic lithosphere beneath the Siberian platform on the slow-moving Eurasian plate, similar to the thickness of the seismic lithosphere beneath Precambrian terrains on the fast-moving Australian plate, suggests that a moderately thick seismic lithosphere beneath Precambrian terrains may be more common than previously supposed.
Keywords: 7207 Seismology: Core and mantle; 7218 Seismology: Lithosphere and upper mantle; 7255 Seismology: Surface waves and free oscillations
Programme: 133;906
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Dommergue, A.; Ferrari, C.P.; Gauchard, P.-A.; Boutron, C.F.; Poissant, L.; Pilote, M.; Jitaru, P.; Adams, F.C. (2003). The fate of mercury species in a sub-arctic snowpack during snowmelt. Geophysical research letters, 30.
Keywords: 0330 Atmospheric Composition and Structure: Geochemical cycles; 0322 Atmospheric Composition and Structure: Constituent sources and sinks; 1863 Hydrology: Snow and ice; 1065 Geochemistry: Trace elements
Programme: 399
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Banks J., Van Buren A., Cherel Y. & Whitfield. J.B. (2006). Genetic evidence for three species of rockhopper penguins, Eudyptes chrysocome. Polar Biol., 30, 61–67.
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Marchand, M.; Bekki, S.; Denis, L.; Pommereau, J.-P.; Khattatov, B.V. (2003). Test of the night-time polar stratospheric NO2 decay using wintertime SAOZ measurements and chemical data assimilation. Geophysical research letters, 30.
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. (2007). Dietary carotenoid supplementation affects orange beak but not foot coloration in Gentoo Penguins Pygoscelis papua. Waterbirds, 30, 573–578.
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Aubin, T., Mathevon, N., Staszewski, V. & Boulinier, T. (2007). Acoustic communication in the Kittiwake Rissa tridactyla: potential cues for sexual and individual signatures in long calls. Polar Biol., 30, 1027–1033.
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Madec L. & Bellido A. (2007). Spatial variation of shell morphometrics in the subantarctic land snail Notodiscus hookeri from Crozet and Kerguelen Islands. Polar Biol., 30, 1571–1578.
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