Carbon isotope evidence for changes in Antarctic Intermediate Water circulation and ocean ventilation in the southwest Pacific during the last deglaciation

被引:83
作者
Bostock, HC [1 ]
Opdyke, BN
Gagan, MK
Fifield, LK
机构
[1] Australian Natl Univ, Dept Earth & Marine Sci, Canberra, ACT 0200, Australia
[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
[3] Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia
来源
PALEOCEANOGRAPHY | 2004年 / 19卷 / 04期
关键词
AAIW; deglaciation; delta C-13;
D O I
10.1029/2004PA001047
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
[1] Deep-sea sediment core FR1/97 GC-12 is located 990 mbsl in the northern Tasman Sea, southwest Pacific, where Antarctic Intermediate Water (AAIW) presently impinges the continental slope of the southern Great Barrier Reef. Analysis of carbon (delta(13)C) and oxygen (delta(18)O) isotope ratios on a suite of planktonic and benthic foraminifera reveals rapid changes in surface and intermediate water circulation over the last 30 kyr. During the Last Glacial Maximum, there was a large delta(13)C offset (1.1parts per thousand) between the surface-dwelling planktonic foraminifera and benthic species living within the AAIW. In contrast, during the last deglaciation ( Termination 1), the delta(13)C(planktonic-benthic) offset reduced to 0.4parts per thousand prior to an intermediate offset (0.7parts per thousand) during the Holocene. We suggest that variations in the dominance and direction of AAIW circulation in the Tasman Sea, and increased oceanic ventilation, can account for the rapid change in the water column delta(13)C(planktonic-benthic) offset during the glacial-interglacial transition. Our results support the hypothesis that intermediate water plays an important role in propagating climatic changes from the polar regions to the tropics. In this case, climatic variations in the Southern Hemisphere may have led to the rapid ventilation of deep water and AAIW during Termination 1, which contributed to the postglacial rise in atmospheric CO2.
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页码:1 / 15
页数:15
相关论文
共 115 条
[1]   Ice-core evidence of abrupt climate changes [J].
Alley, RB .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2000, 97 (04) :1331-1334
[2]   A northern lead in the orbital band: north-south phasing of Ice-Age events [J].
Alley, RB ;
Brook, EJ ;
Anandakrishnan, S .
QUATERNARY SCIENCE REVIEWS, 2002, 21 (1-3) :431-441
[3]   ESTIMATES OF SEA SURFACE TEMPERATURE IN THE CORAL SEA AT THE LAST GLACIAL MAXIMUM [J].
Anderson, D. M. ;
Prell, W. L. ;
Barratt, N. J. .
PALEOCEANOGRAPHY, 1989, 4 (06) :615-627
[4]   Tropical Pacific Ocean thermocline depth reconstructions for the last glacial maximum [J].
Andreasen, DJ ;
Ravelo, AC .
PALEOCEANOGRAPHY, 1997, 12 (03) :395-413
[5]   Radiocarbon calibration by means of mass spectrometric 230Th/234U and 14C ages of corals:: An updated database including samples from Barbados, Mururoa and Tahiti [J].
Bard, E ;
Arnold, M ;
Hamelin, B ;
Tisnerat-Laborde, N ;
Cabioch, G .
RADIOCARBON, 1998, 40 (03) :1085-1092
[6]   VOSTOK ICE CORE PROVIDES 160,000-YEAR RECORD OF ATMOSPHERIC CO2 [J].
BARNOLA, JM ;
RAYNAUD, D ;
KOROTKEVICH, YS ;
LORIUS, C .
NATURE, 1987, 329 (6138) :408-414
[7]   Sea-surface temperatures of the southwest Pacific Ocean during the Last Glacial Maximum [J].
Barrows, TT ;
Juggins, S ;
De Deckker, P ;
Thiede, J ;
Martinez, JI .
PALEOCEANOGRAPHY, 2000, 15 (01) :95-109
[8]  
Be A.W.H., 1977, P1
[9]  
Be A. W. H, 1977, Micropaleontology, V23, P369, DOI 10.2307/1485406
[10]   Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and revised paleotemperature equations [J].
Bemis, BE ;
Spero, HJ ;
Bijma, J ;
Lea, DW .
PALEOCEANOGRAPHY, 1998, 13 (02) :150-160