| |
Records |
Links |
|
Author |
Spahni R., Schwander J., Flückiger J., Stauffer B., Chappellaz J. & Raynaud D. |
|
| |
Title |
The attenuation of fast atmospheric CH4 variations recorded in polar ice cores. |
Type |
Journal Article |
| |
Year |
2003 |
Publication |
Geophysical research letters |
Abbreviated Journal |
|
|
| |
Volume  |
30 |
Issue |
11 |
Pages |
25-1 |
|
| |
Keywords |
|
|
| |
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 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0094-8276 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
2231 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Savarino, J.; Romero, A.; Cole-Dai, J.; Bekki, S.; Thiemens, M.H. |
|
| |
Title |
UV induced mass-independent sulfur isotope fractionation in stratospheric volcanic sulfate |
Type |
Journal Article |
| |
Year |
2003 |
Publication |
Geophysical research letters |
Abbreviated Journal |
|
|
| |
Volume |
30 |
Issue |
|
Pages |
|
|
| |
Keywords |
0340 Atmospheric Composition and Structure: Middle atmosphere—composition and chemistry; 0370 Atmospheric Composition and Structure: Volcanic effects; 1040 Geochemistry: Isotopic composition/chemistry; 1827 Hydrology: Glaciology |
|
| |
Abstract |
Sulfuric acid aerosols produced in the stratosphere following massive volcanic eruptions possess a mass-independent sulfur isotopic signature, acquired when volcanic SO2 experiences UV photooxidation. The volcanic data are consistent with laboratory SO2 photooxidation experiments using UV light at 248 nm (maximum absorption of ozone), whereas sulfur isotopic anomalies previously observed in Archean samples are consistent with photodissociation at 190–220 nm. A mechanism of SO2 photooxidation, occurring in the early stage of a stratospheric volcanic plume, in the range of 220–320 nm (weak band absorption of SO2), is also proposed. Since mass-independent sulfur isotope anomalies in stratospheric volcanic sulfate appear to depend on the exposure of SO2 to UV radiation, their measurements might therefore offer the possibility to determine the degree of UV penetration in the ozone-absorption window for the present and past atmospheres. They can also be used to determine the stratospheric or tropospheric nature of volcanic eruptions preserved in glaciological records, offering the possibility to reassess the climatic impact of past volcanic eruptions. |
|
| |
Programme |
457 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
American Geophysical Union |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0094-8276 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5537 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Genthon, C.; Cosme, E. |
|
| |
Title |
Intermittent signature of ENSO in west-Antarctic precipitation |
Type |
Journal Article |
| |
Year |
2003 |
Publication |
Geophysical research letters |
Abbreviated Journal |
|
|
| |
Volume |
30 |
Issue |
|
Pages |
|
|
| |
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 |
|
| |
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. |
|
| |
Programme |
411 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
American Geophysical Union |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0094-8276 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5605 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Priestley, K.; Debayle, E. |
|
| |
Title |
Seismic evidence for a moderately thick lithosphere beneath the Siberian Platform |
Type |
Journal Article |
| |
Year |
2003 |
Publication |
Geophysical research letters |
Abbreviated Journal |
|
|
| |
Volume |
30 |
Issue |
|
Pages |
|
|
| |
Keywords |
7207 Seismology: Core and mantle; 7218 Seismology: Lithosphere and upper mantle; 7255 Seismology: Surface waves and free oscillations |
|
| |
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. |
|
| |
Programme |
133;906 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
American Geophysical Union |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0094-8276 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5630 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Dommergue, A.; Ferrari, C.P.; Gauchard, P.-A.; Boutron, C.F.; Poissant, L.; Pilote, M.; Jitaru, P.; Adams, F.C. |
|
| |
Title |
The fate of mercury species in a sub-arctic snowpack during snowmelt |
Type |
Journal Article |
| |
Year |
2003 |
Publication |
Geophysical research letters |
Abbreviated Journal |
|
|
| |
Volume |
30 |
Issue |
|
Pages |
|
|
| |
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 |
|
| |
Abstract |
An extensive mercury study was conducted in April 2002 prior to and during the annual melting of a snowpack in a sub-arctic site along the Hudson Bay (Canada). Gas-phase measurements show that the snowmelt coincides with an elemental mercury (Hg°) pulse in the snowpack air far above ambient levels. Additional measurements of inorganic mercury (Hg2+) and methylmercury (MeHg+) in snow pits, in surface snow and in a meltwater sample clearly reveal that most of Hg is removed from the snow during the first days of snowmelt. We estimate that gas-phase exchanges contribute poorly to remove Hg from the snowpack; consequently during a snowmelt day more than 90% of Hg present in the snow surface is likely released with the meltwater. In arctic areas, where Hg accumulates at an accelerated rate in the snow surfaces [
Lu et al., 2001] during mercury depletion events (MDE), the discharge of this toxic and bio-accumulating pollutant in water systems could be a threat to ecosystems and local indigenous populations. |
|
| |
Programme |
399 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
American Geophysical Union |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0094-8276 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5642 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Banks J., Van Buren A., Cherel Y. & Whitfield. J.B. |
|
| |
Title |
Genetic evidence for three species of rockhopper penguins, Eudyptes chrysocome. |
Type |
Journal Article |
| |
Year |
2006 |
Publication |
Polar biology |
Abbreviated Journal |
Polar Biol. |
|
| |
Volume |
30 |
Issue |
|
Pages |
61-67 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Programme |
109 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0722-4060 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
3722 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Marchand, M.; Bekki, S.; Denis, L.; Pommereau, J.-P.; Khattatov, B.V. |
|
| |
Title |
Test of the night-time polar stratospheric NO2 decay using wintertime SAOZ measurements and chemical data assimilation |
Type |
Journal Article |
| |
Year |
2003 |
Publication |
Geophysical research letters |
Abbreviated Journal |
|
|
| |
Volume |
30 |
Issue |
|
Pages |
|
|
| |
Keywords |
0340 Atmospheric Composition and Structure: Middle atmosphere—composition and chemistry; 3210 Mathematical Geophysics: Modeling; 3337 Meteorology and Atmospheric Dynamics: Numerical modeling and data assimilation |
|
| |
Abstract |
Chemistry Transport Models (CTMs) tend to underestimate very severely NO2 concentrations in the polar lower stratosphere during the winter suggesting that either the NO
x sink is overestimated or a source of NO
x is missing in models. We study the night-time decay of polar NO2 because it is controlled by the reaction between NO2 and O3 which is thought to be the main NO
x sink at high latitudes winter. The model-calculated night-time decay of polar NO2 is tested using solar occultation measurement of NO2 and O3 taken within the Northern polar vortex by the “Système d'Analyse parObservation Zénithal” (SAOZ) instrument on board of a long duration balloon in February 2000. A trajectory analysis is performed in order to find air parcels which have been sampled at sunset and at sunrise by the SAOZ instrument and have stayed in the dark between the measurements. Sunset (or sunrise) SAOZ measurements are then assimilated in a trajectory photochemical model in a variational mode and compared to the corresponding sunrise (or sunset) SAOZ measurements which are called validation measurements. The results are used to assess the ability of the model to reproduce the observed night-time evolution of NO2. Overall, there is a good agreement between analyzed NO2 and validation measurements indicating that the night-time chemistry of NO2 appears to be properly described by the model. The results do not hint at all at the existence of a NO
x source, and certainly not a source strong enough to counteract the NO2 sink (NO2 + O3 reaction). |
|
| |
Programme |
209 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
American Geophysical Union |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0094-8276 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5639 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Jouventin P., Mcgraw K. J., Morel M. & Célerier A. |
|
| |
Title |
Dietary carotenoid supplementation affects orange beak but not foot coloration in Gentoo Penguins Pygoscelis papua |
Type |
Journal Article |
| |
Year |
2007 |
Publication |
Waterbirds |
Abbreviated Journal |
Waterbirds |
|
| |
Volume |
30 |
Issue |
|
Pages |
573-578 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Programme |
354 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1524-4695 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
4580 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Aubin, T., Mathevon, N., Staszewski, V. & Boulinier, T. |
|
| |
Title |
Acoustic communication in the Kittiwake Rissa tridactyla: potential cues for sexual and individual signatures in long calls. |
Type |
Journal Article |
| |
Year |
2007 |
Publication |
Polar biology |
Abbreviated Journal |
Polar Biol. |
|
| |
Volume |
30 |
Issue |
|
Pages |
1027-1033 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Programme |
333 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0722-4060 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
4638 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Madec L. & Bellido A. |
|
| |
Title |
Spatial variation of shell morphometrics in the subantarctic land snail Notodiscus hookeri from Crozet and Kerguelen Islands. |
Type |
Journal Article |
| |
Year |
2007 |
Publication |
Polar biology |
Abbreviated Journal |
Polar Biol. |
|
| |
Volume |
30 |
Issue |
|
Pages |
1571-1578 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Programme |
136 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0722-4060 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
4796 |
|
| Permanent link to this record |
