Basile I., Petit J.R., Touron S., Grousset F.E. & Barkov N.I. (2001). Volcanic layers in Antarctic (Vostok) ice-cores : source identification and atmospheric implications. J. Geophys. Res., 106(d23), 31915–31931.
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Braünlich M., Abbalin O., Marik T., Jöckel P., M Brenninkmeijer C.A., Chappellaz J., Barnola J.M., Mulvaney R. & Sturges W.T. (2001). Changes in the global atmospheric methane budget over the last decades inferred from 13C and D isotopic analysis of Antarctic firn air. J. Geophys. Res., 106(d17), 20465–20481.
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Caillon N., Severinghaus J.P., Barnola J.M., Chappellaz J., Jouzel J. & Parrenin F. (2001). Estimation of temperature change and of gas age – ice age difference, 108kyr BP, at Vostok, Antarctica. J. Geophys. Res., 106(d23), 31893–31902.
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Genthon C. & Krinner G. (2001). Antarctic surface mass balance and systematic biases in GCMs. J. Geophys. Res., 106(d18), 20653–20664.
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Parrenin F., Jouzel J., Waelbroeck C., Ritz C. & Barnola J.M. (2001). Dating the Vostok ice core by an inverse method. J. Geophys. Res., 106(d23), 31837–31851.
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Pepin L., Raynaud D., Barnola J.M.. & Loutre M.F. (2001). Hemispheric roles of climate forcings during glacial-interglacial transitions, as decuced from the Vostok record and LLN-2D model experiments. J. Geophys. Res., 106(d23), 31885–31892.
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Sturges W.T., Mcintre H.P., Penkett S.A., Chappellaz J., Barnola J.M., Mulvaney R., Atlas E. & Stroud V. (2001). Methyl bromide, other brominated methanes, and methyl iodide in polar firn air. J. Geophys. Res., 106(d2), 1595–1606.
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Vimeux F., Masson V., Delaygue G., Jouzel J., Petit J.R. , Stievenard M., Vaikmae R. & White J.W.C. (2001). A 420,000 year deuterium excess record from East Antarctica : Information on past changes in the origin of precipitation at Vostok. J. Geophys. Res., 106(d23), 31863–31873.
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Drinkwater M.R., Long D.G. & Bingham A.W. (2001). Greenland Snow Accumulation Estimates from Scatterometer Data,. J. Geophys. Res., 106(d24), 33935–33950.
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Williams, J.; Gros, V.; Bonsang, B.; Kazan, V. (2001). HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island. J. Geophys. Res., 106(d12), 12,719–12,725.
Abstract: A new empirical method for the derivation of average HO radical concentrations is presented. The method is based on estimation of CO lifetime through the relative variability of CO and Rn measurements, and hydrocarbon measurements are used to independently determine the relative effects of chemistry and dynamics. Data from Amsterdam Island (37°S, 77°E), a remote site in the southern Indian Ocean, are used to calculate annual and daily HO levels for 1997 and 1998. A seasonal variation in calculated daily HO, consistent with seasonally changing photolysis rates, with maxima in summer and minima in winter is also derived which is comparable but slightly lower than the most recent zonal mean HO estimates of Spivakovsky et al. [2000]. The calculated annual HO shows a decrease from 2.7 × 105 molecule cm?3 in 1997 to 0.8 × 105 molecule cm?3 in 1998, possibly as a result of El Niño related meteorological changes. The empirically calculated HO correlates with temperature and relative humidity measured at the island but anticorrelates strongly with CO and to a lesser extent with O3. The limitations and improvements to this method are discussed. The method has potential for long-term monitoring of HO changes over areas upwind from remote sites.
Programme: 415
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