Tidal modulation of Sr/Ca ratios in a Pacific reef coral

被引：29

作者：

Cohen, AL ^{[1
]}

Sohn, RA ^{[1
]}

机构：

[1] Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2004年 / 31卷 / 16期

关键词：

D O I：

10.1029/2004GL020600

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The strontium-to-calcium ratio (Sr/Ca) of reef coral skeleton is an important tool for reconstructing past sea surface temperatures (SSTs). However, the accuracy of paleoSSTs derived from fossil coral Sr/Ca is challenged by evidence that physiological processes influence skeletal chemistry. Here we show that water level variations from tidal forcing are correlated with changes in coral Sr/Ca that cannot be accounted for by changes in SST. Ion microprobe measurements of Sr/Ca ratios in a Pacific Porites lutea reveal high-frequency variations at periods of similar to6, similar to10, and similar to25 days. The relationship between Sr/Ca and temperature on these short timescales does not follow trends observed at longer periods, indicating that an additional forcing is required to explain our observations. We demonstrate that Sr/Ca is correlated with both tidal water level variations and SST, and that their contributions to the Sr/Ca content of the skeleton vary as a function of period. We propose that water level influences Sr/Ca indirectly via modulation of photosynthetically-active radiation (PAR) that drives large changes in zooxanthellate photosynthesis.

引用

页码：L163101 / 4

页数：4

共 21 条

[1] Comparative determinations of trace and minor elements in coral aragonite by ion microprobe analysis, with preliminary results from Phuket, southern Thailand [J].

Allison, N .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1996, 60 (18) :3457-3470

[2] Kinetics of photoacclimation in corals [J].

Anthony, KRN ;

Hoegh-Guldberg, O .

OECOLOGIA, 2003, 134 (01) :23-31

[3] ON THE NATURE AND CAUSES OF DENSITY BANDING IN MASSIVE CORAL SKELETONS [J].

BARNES, DJ ;

LOUGH, JM .

JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, 1993, 167 (01) :91-108

[4] Abrupt changes in early Holocene tropical sea surface temperature derived from coral records [J].

Beck, JW ;

Recy, J ;

Taylor, F ;

Edwards, RL ;

Cabioch, G .

NATURE, 1997, 385 (6618) :705-707

[5]

BUDDEMEIER RW, 1974, 2 INT COR REEF S GRE

[6] Geochemical perspectives on coral mineralization [J].

Cohen, AL ;

McConnaughey, TA .

BIOMINERALIZATION, 2003, 54 :151-187

[7] The effect of algal symbionts on the accuracy of Sr/Ca paleotemperatures from coral [J].

Cohen, AL ;

Owens, KE ;

Layne, GD ;

Shimizu, N .

SCIENCE, 2002, 296 (5566) :331-333

[8] Kinetic control of skeletal Sr/Ca in a symbiotic coral: Implications for the paleotemperature proxy [J].

Cohen, AL ;

Layne, GD ;

Hart, SR ;

Lobel, PS .

PALEOCEANOGRAPHY, 2001, 16 (01) :20-26

[9] Interdecadal variation in the extent of South Pacific tropical waters during the Younger Dryas event [J].

Corrège, T ;

Gagan, MK ;

Beck, JW ;

Burr, GS ;

Cabioch, G ;

Le Cornec, F .

NATURE, 2004, 428 (6986) :927-929

[10] BIOLOGICAL-CONTROLS ON CORAL SR/CA AND DELTA-O-18 RECONSTRUCTIONS OF SEA-SURFACE TEMPERATURES [J].

DEVILLIERS, S ;

NELSON, BK ;

CHIVAS, AR .

SCIENCE, 1995, 269 (5228) :1247-1249

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