History of carbonate ion concentration over the last 100 million years

被引:146
作者
Tyrrell, T [1 ]
Zeebe, RE
机构
[1] Univ Southampton, Southampton Oceanog Ctr, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England
[2] Alfred Wegener Inst Polar & Marine Res, D-27570 Bremerhaven, Germany
关键词
D O I
10.1016/j.gca.2004.02.018
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Instead of having been more or less constant, as once assumed, it is now apparent that the major ion chemistry of the oceans has varied substantially over time. For instance, independent lines of evidence suggest that calcium concentration ([Ca(2+)]) has approximately halved and magnesium concentration ([Mg(2+)]) approximately doubled over the last 100 million years. On the other hand, the calcite compensation depth, and hence the CaCO(3) saturation, has varied little over the last 100 My as documented in deep sea sediments. We combine these pieces of evidence to develop a proxy for seawater carbonate ion concentration ([CO(3)(2-)]) over this period of time. From the calcite saturation state (which is proportional to the product of [Ca(2+)] times [CO(3)(2-)], but also affected by [Mg(2+)] we can calculate seawater [CO(3)(2-)] Our results show that [CO(3)(2-)] has nearly quadrupled since the Cretaceous. Furthermore, by combining our [CO(3)(2-)] proxy with other carbonate system proxies, we provide calculations of the entire seawater carbonate system and atmospheric CO(2). Based on this, reconstructed atmospheric CO(2) is relatively low in the Miocene but high in the Eocene. Finally, we make a strong case that seawater pH has increased over the last 100 My. Copyright (C) 2004 Elsevier Ltd
引用
收藏
页码:3521 / 3530
页数:10
相关论文
共 72 条
[1]   EFFECT OF DEEP-SEA SEDIMENTARY CALCITE PRESERVATION ON ATMOSPHERIC CO2 CONCENTRATION [J].
ARCHER, D ;
MAIERREIMER, E .
NATURE, 1994, 367 (6460) :260-263
[2]   Photosynthesis-induced biofilm calcification and calcium concentrations in phanerozoic oceans [J].
Arp, G ;
Reimer, A ;
Reitner, J .
SCIENCE, 2001, 292 (5522) :1701-1704
[3]   Foraminiferal calcification response to glacial-interglacial changes in atmospheric CO2 [J].
Barker, S ;
Elderfield, H .
SCIENCE, 2002, 297 (5582) :833-836
[4]   INFLUENCE OF SEA-WATER COMPOSITION ON APPARENT CONSTANTS OF CARBONATE SYSTEM [J].
BENYAAKOV, S ;
GOLDHABE.MB .
DEEP-SEA RESEARCH, 1973, 20 (01) :87-99
[5]  
Berner E.K., 2012, GLOBAL ENV WATER AIR
[6]   THE CARBONATE-SILICATE GEOCHEMICAL CYCLE AND ITS EFFECT ON ATMOSPHERIC CARBON-DIOXIDE OVER THE PAST 100 MILLION YEARS [J].
BERNER, RA ;
LASAGA, AC ;
GARRELS, RM .
AMERICAN JOURNAL OF SCIENCE, 1983, 283 (07) :641-683
[7]   GEOCARB III:: A revised model of atmospheric CO2 over phanerozoic time [J].
Berner, RA ;
Kothavala, Z .
AMERICAN JOURNAL OF SCIENCE, 2001, 301 (02) :182-204
[8]   3GEOCARB-II - A REVISED MODEL OF ATMOSPHERIC CO2 OVER PHANEROZOIC TIME [J].
BERNER, RA .
AMERICAN JOURNAL OF SCIENCE, 1994, 294 (01) :56-91
[9]  
Broecker W.S., 1982, Tracers in the Sea
[10]   OCEAN CHEMISTRY DURING GLACIAL TIME [J].
BROECKER, WS .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1982, 46 (10) :1689-1705