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Landais, A.; Steffensen, J.P.; Caillon, N.; Jouzel, J.; Masson-Delmotte, V.; Schwander, J. |
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Title |
Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5e1 (120 kyr BP) from gas isotopes |
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Journal Article |
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Year |
2004 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
109 |
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Keywords |
1827 Hydrology: Glaciology; 3344 Meteorology and Atmospheric Dynamics: Paleoclimatology; 3349 Meteorology and Atmospheric Dynamics: Polar meteorology |
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Abstract |
The disturbed stratigraphy of the ice in the lowest 10% of the Greenland GRIP ice core has been previously demonstrated using gas measurements (?18O of O2 and CH4) on a few meters depth scale. However, rapid ice isotopic variations (on the scale of 20 cm) are experienced in the bottom of the GRIP ice core with complex chemical signatures that make them difficult to reconcile with a disturbed stratigraphy of the ice. This is the case for event 5e1, first described as a dramatic cooling 120 kyr BP. We analyzed at a 5 cm resolution the isotopic composition of the air from 2 m of the GRIP bottom ice core covering event 5e1. The ?15N measurements, combined with a basic firn modeling, lead to the solid conclusion that the rapid event 5e1 is not a climatic event. Rapid variations of ?18O of O2 (?18Oatm) are in agreement with a disturbed ice stratigraphy. However, the double peak shape of the ?18Oatm, recalling chemical data at the same depth, requires processes of diffusion after the mixing or even postcoring, placing limits to the interpretation of some classical paleoclimatic proxies in small scale mixed ice (<1 m). |
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American Geophysical Union |
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0148-0227 |
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yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5647 |
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Title |
High resolution climate record of the northern hemisphere reaching into last interglacial period. |
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Journal Article |
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Year |
2005 |
Publication |
Nature |
Abbreviated Journal |
Nature |
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Volume |
431 |
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Pages |
147-151 |
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458 |
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0028-0836 |
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yes |
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3102 |
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Masson-Delmotte, V.; Landais, A.; Stievenard, M.; Cattani, O.; Falourd, S.; Jouzel, J.; Johnsen, S.J.; Dahl-Jensen, D.; Sveinsbjornsdottir, A.; White, J.W.C.; Popp, T.; Fischer, H. |
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Title |
Holocene climatic changes in Greenland: Different deuterium excess signals at Greenland Ice Core Project (GRIP) and NorthGRIP |
Type |
Journal Article |
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Year |
2005 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
110 |
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Keywords |
paleoclimate; polar ice sheet; water cycle; 1041 Geochemistry: Stable isotope geochemistry; 0724 Cryosphere: Ice cores; 1620 Global Change: Climate dynamics; 1655 Global Change: Water cycles; 3344 Atmospheric Processes: Paleoclimatology |
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Abstract |
Water stable isotope measurements (?D and ?18O) have been conducted on the Holocene part of two deep Greenland ice cores (Greenland Ice Core Project (GRIP) and NorthGRIP), located ?320 km apart. These combined measurements provide the first two continuous Greenland Holocene deuterium excess profiles (d = ?D ? 8?18O), a parameter strongly influenced by changes in moisture sources. We discuss here temporal and regional fluctuations of the deuterium excess within central to north Greenland, with a mean temporal resolution of ?4 years. Although GRIP and NorthGRIP exhibit similar annual mean surface temperatures and ?18O levels, a significant offset of modern deuterium excess is observed between the two sites. We attribute this offset to a different mix of modern moisture sources, pointing to regional-scale differences in moisture advection toward Greenland. The common long-term deuterium excess Holocene increasing trend is probably related to the increased relative contribution of low-latitude moisture to Greenland snowfall, in response to the change in the Earth obliquity, as symmetrically observed in Antarctica. Three abrupt declines punctuate the GRIP excess record (8.2, 4.5, and 0.35 ka BP), suggesting associated reorganizations of the northern high latitudes hydrological cycle. The 8.2 ka BP event is characterized by (1) a rapid cooling followed by a progressive warming and (2) a deuterium excess cooling restricted to GRIP, therefore totally different from rapid events during glacial times. By contrast, the NorthGRIP deuterium excess record is more stable. We propose that a slightly larger proportion of moisture supplied by local storm tracks to GRIP induces an isotopic compensation mechanism between simultaneous site and source temperature coolings, resulting in a rather temperature-insensitive ?18O profile, together with well-marked deuterium excess amplitudes. NorthGRIP ?18O seems less biased by isotopic processes and should provide a more reliable past temperature record. |
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American Geophysical Union |
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0148-0227 |
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yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5508 |
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Masson-Delmotte, V.; Dreyfus, G.; Braconnot, P.; Johnsen, S.; Jouzel, J.; Kageyama, M.; Landais, A.; Loutre, M.-F.; Nouet, J.; Parrenin, F.; Raynaud, D.; Stenni, B.; Tuenter, E. |
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Title |
Past temperature reconstructions from deep ice cores: relevance for future climate change |
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Journal Article |
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Year |
2006 |
Publication |
Climate of the past |
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2 |
Issue |
2 |
Pages |
145-165 |
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458 |
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Copernicus Publications |
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1814-9324 |
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yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5530 |
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Masson-Delmotte, V. , Jouzel, J., Landais, A., Stievenard, M. , Johnsen, S.J. , White, J.W.C. , Sveinbjornsdottir, A. , Fuhrer, K., |
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Title |
Deuterium excess reveals millennial and orbital scale fluctuations of Greenland moisture origin |
Type |
Journal Article |
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Year |
2005 |
Publication |
Science |
Abbreviated Journal |
Science |
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Volume |
309 |
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118-121 |
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458 |
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0036-8075 |
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yes |
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3942 |
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Author |
Landais A, Masson-Delmotte V, Jouzel J, Raynaud D, Johnsen S, Huber C, Leuenberger M, Schwander J, Minster B |
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Title |
The glacial inception as recorded in the NorthGRIP Greenland ice core: timing, structure and associated abrupt temperature changes |
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Journal Article |
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Year |
2006 |
Publication |
Climate dynamics |
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Volume |
26 |
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Pages |
273-284 |
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458 |
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0930-7575 |
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yes |
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3943 |
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Author |
Landais A, Waelbroeck C, Masson-Delmotte V |
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Title |
On the limits of Antarctic and marine climate records synchronization: Lag estimates during marine isotopic stages 5d and 5c |
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Journal Article |
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Year |
2006 |
Publication |
Paleoceanography |
Abbreviated Journal |
Paleoceanography |
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Volume |
21 |
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Pages |
1001 |
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458 |
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0883-8305 |
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yes |
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3944 |
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Masson-Delmotte V, Landais A, Combourieu-Nebout N, von Grafenstein U, Jouzel J, Caillon N, Chappellaz J, Dahl-Jensen D, Johnsen SJ, Stenni B |
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Title |
Rapid climate variability during warm and cold periods in polar regions and Europe |
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Journal Article |
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2005 |
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C.R. Acad. Sci. Paris |
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337 |
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935-946 |
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458 |
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3945 |
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Landais A, Jouzel J, Masson-Delmotte V, Caillon N |
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Title |
Large temperature variations over rapid climatic events in Greenland: a method based on air isotopic measurements |
Type |
Journal Article |
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Year |
2005 |
Publication |
C.R. Acad. Sci. Paris |
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Volume |
337 |
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Pages |
947-956 |
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458 |
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3946 |
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Jouzel J, Masson-Delmotte V, Stievenard M, Landais A, Vimeux F, Johnsen SJ, Sveinbjornsdottir AE, White JW |
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Title |
Rapid deuterium-excess changes in Greenland ice cores: a link between the ocean and the atmosphere |
Type |
Journal Article |
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Year |
2005 |
Publication |
C.R. Acad. Sci. Paris |
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Volume |
337 |
Issue |
10-11 |
Pages |
957-969 |
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458 |
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3947 |
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