The deuterium excess records of EPICA Dome C and Dronning Maud Land ice cores (East Antarctica)

被引：173

作者：

Stenni, B. ^{[1
]}

Masson-Delmotte, V. ^{[2
]}

Selmo, E. ^{[3
]}

Oerter, H. ^{[4
]}

Meyer, H. ^{[5
]}

Roethlisberger, R. ^{[6
]}

Jouzel, J. ^{[2
]}

Cattani, O. ^{[2
]}

Falourd, S. ^{[2
]}

Fischer, H. ^{[7
,8
]}

Hoffmann, G. ^{[2
]}

Iacumin, P. ^{[3
]}

Johnsen, S. J. ^{[9
]}

Minster, B. ^{[2
]}

Udisti, R. ^{[10
]}

机构：

[1] Univ Trieste, Dept Geol Environm & Marine Sci, I-34127 Trieste, Italy

[2] CEA Saclay, CNRS, UMR 1572,CEA, UVSQ,IPSL,LSCE, F-91191 Gif Sur Yvette, France

[3] Univ Parma, Dept Earth Sci, I-43100 Parma, Italy

[4] Alfred Wegener Inst Polar & Marine Res, D-2850 Bremerhaven, Germany

[5] Alfred Wegener Inst Polar & Marine Res, Potsdam, Germany

[6] British Antarctic Survey, Cambridge CB3 0ET, England

[7] Univ Bern, Inst Phys, CH-3012 Bern, Switzerland

[8] Univ Bern, Oeschger Ctr Climate Change Res, CH-3012 Bern, Switzerland

[9] Univ Copenhagen, Niels Bohr Inst, Ctr Ice & Climate, DK-2100 Copenhagen, Denmark

[10] Univ Florence, Dept Chem, Florence, Italy

来源：

QUATERNARY SCIENCE REVIEWS | 2010年 / 29卷 / 1-2期

关键词：

SOUTHERN-OCEAN; ISOTOPIC COMPOSITION; CLIMATE VARIABILITY; WATER ISOTOPES; SURFACE; PRECIPITATION; MODEL; DUST; TEMPERATURES; CIRCULATION;

D O I：

10.1016/j.quascirev.2009.10.009

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

New high-resolution deuterium excess (d) data from the two EPICA ice cores drilled in Dronning Maud Land (EDML) and Dome C (EDC) are presented here. The main moisture sources for precipitation at EDC and EDML are located in the Indian Ocean and Atlantic Ocean, respectively. The more southward moisture origin for EDML is reflected in a lower present-day d value, compared to EDC. The EDML and EDC isotopic records (delta O-18 and d) show the main climate features common to the East Antarctic plateau and similar millennial scale climate variability during the last glacial period. However, quite large delta O-18 and d differences are observed during MIS5.5 and the glacial inception with a long-term behaviour. A possibility for this long-term difference could be related to uncertainties in past accumulation rate which are used in the glaciological models. Regional climate anomalies between the two sites during MIS5.5 could also be consistent with the observed EDML-EDC delta O-18 and d gradient anomalies. Simulations performed with the General Circulation Model ECHAM4 for different time slices provide a temporal temperature/isotope slope for the EDML region in fair agreement to the modern spatial slope. T-site and T-source records are extracted from both ice cores, using a modelling approach, after corrections for past 8180 seawater and elevation changes. A limited impact of d on Antarctic temperature reconstruction at both EDML and EDC has been found with a higher impact only at glacial inception. The AIM (Antarctic Isotope Maximum) events in both ice cores are visible also after the source correction, suggesting that these are real climate features of the glacial period. The different shape of the AIM events between EDC and EDML, as well as some climate features in the early Holocene, points to a slightly different climate evolution at regional scale. A comparison of our temperature reconstruction profiles with the aerosol fluxes show a strong coupling of the nssCa fluxes with Antarctic temperatures during glacial period and a tighter coupling of delta O-18 and T-site with ssNa flux at EDML compared to EDC during the glacial period and MIS5.5. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：146 / 159

页数：14

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