Mg/Ca Thermometry in Coral Skeletons

Mitsuguchi, Takehiro; Matsumoto, Eiji; Abe, Osamu; Uchida, Tetsuo; Isdale, Peter

doi:10.1126/science.274.5289.961

Cited by 338 publications

(225 citation statements)

References 11 publications

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“…Given the long residence time of Mg in ocean waters, it is unlikely that squid at the different locations experienced varying concentrations of dissolved Mg2+. Mitsuguchi et al (1996) reported that Mg/Ca ratios were positively correlated with temperature in coral skeletons, but it seems unlikely that the autumn-spawned cohort was consistently exposed to higher temperatures than the spring-spawned cohort ). However, differences in Mg and Mn content could be explained if organic content varied with growth rate and growth rate varied across cohorts.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal variation in elemental signatures of statoliths from the Patagonian longfin squid (Loligo gahi)

Arkhipkin¹,

Campana²,

Fitzgerald³

et al. 2004

Can. J. Fish. Aquat. Sci.

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Abstract:We quantified elemental signatures in statoliths of 718 Patagonian longfin squid (Loligo gahi) collected in the vicinity of the Falkland Islands (southwest Atlantic) and at sites on the Patagonian Shelf and coastal Peru. All squid were assigned to a spawning cohort by size, spawning condition, and back-calculated spawning date based on daily increments in statoliths. The remaining statolith was then analyzed for six elemental ratios (Mg/Ca, Mn/Ca, Sr/Ca, Cd/Ca, Ba/Ca, and Pb/Ca) using high-resolution inductively coupled plasma mass spectrometry (ICP-MS). Elemental concentrations in the statoliths were broadly similar to other biogenic aragonites. Differences in Sr/Ca ratios in statoliths among geographic locations were generally consistent with a negative correlation between Sr/Ca and temperature. Variations in statolith Cd/Ca and Ba/Ca values confirmed that during winter months, the squid were foraging deeper in the water column. Both Mg/Ca and Mn/Ca ratios in statoliths decreased with squid size, probably corresponding to a decrease in the contribution of the organic component of the statolith. Elemental signatures in the statoliths of L. gahi varied significantly geographically and between spring-and autumn-spawned cohorts, which must therefore have spent significant portions of their life histories in different environments. Résumé : Nous avons quantifié les signatures d'éléments dans les statolithes de 718 calmars patagons (Loligo gahi)récoltés dans les environs des îles Falkland (Atlantique sud) et à certains sites sur la plate-forme patagonienne et la côte du Pérou. Tous les calmars ont été assignés à une cohorte de fraye d'après leur taille, leur état reproductif et leur date de fraye déterminée par rétrocalcul à partir des couches de croissance journalière sur les statolithes. Nous avons déterminé six rapports d'éléments dans le second statolithe, soit Mg/Ca, Mn/Ca, Sr/Ca, Cd/Ca, Ba/Ca et Pb/Ca, après une analyse par spectrométrie de masse à source de plasma à couplage inductif (ICP-MS) de haute résolution. Les concentrations d'éléments dans les statolithes sont grossièrement semblables à celles des autres aragonites d'origine biologique. Les différences de Sr/Ca dans les statolithes provenant des diverses localités géographiques s'accordent en général avec la corrélation négative qui existe entre Sr/Ca et la température. Les variations de Cd/Ca et de Ba/Ca dans les statolithes confirment que durant les mois d'hiver les calmars recherchent leur nourriture à de plus grandes profondeurs dans la colonne d'eau. Les rapports Mg/Ca et Mn/Ca déclinent tous les deux à mesure que le calmar grandit, ce qui correspond probablement à une diminution de la contribution de la composante organique du statolithe. Les signatures des éléments des statolithes de L. gahi varient de façon significative en fonction du site géographique, ainsi qu'entre les cohortes pondues au printemps et à l'automne, qui doivent alors avoir passé une partie significative de leur temps dans des environnements différents.[Traduit par l...

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Section: Discussionmentioning

confidence: 99%

Spatial and temporal variation in elemental signatures of statoliths from the Patagonian longfin squid (Loligo gahi)

Arkhipkin¹,

Campana²,

Fitzgerald³

et al. 2004

Can. J. Fish. Aquat. Sci.

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“…3c). As Mg/Ca is positively correlated with SST (Mitsuguchi et al 1996(Mitsuguchi et al , 2003, this rising trend may record the increase in SST from the 1930s. In contrast, the Mg/Ca series obtained from 10AR1 has no secular rising or declining trend from the 1930s (Fig.…”

Section: Coral Geochemical Records and Growth Ratesmentioning

confidence: 99%

Evaluation of annual resolution coral geochemical records as climate proxies in the Great Barrier Reef of Australia

et al. 2014

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Sampling of annually banded massive coral skeletons at annual (or higher) resolutions is increasingly being used to obtain replicate long-term time series of changing seawater conditions. However, few of these studies have compared and calibrated the lower annual resolution records based on coral geochemical tracers with the corresponding instrumental climate records, although some studies have inferred the climatic significance of annual coral series derived from averages of monthly or sub-annual records. Here, we present annual resolution analysis of coral records of elemental and stable isotopic composition that are approximately 70 years long. These records were preserved in two coexisting colonies of Porites sp. from Arlington Reef, on the Great Barrier Reef in Australia, and are used to evaluate the climatic significance of annually resolved coral geochemical proxies. The geochemical records of coral sample ''10AR2,'' with its faster and relatively constant annual growth rate, appear to have been independent of skeletal growth rate and other vital effects. The annual resolution of Sr/Ca and Dd 18 O time series was shown to be a good proxy for annual sea surface temperature (SST; r = -0.67, n = 73, p \ 0.0000001) and rainfall records (r = -0.34, n = 67, p \ 0.01). However, a slower growing coral sample, ''10AR1'' showed significantly lower correlations (r = -0.20, n = 71, p = 0.05 for Sr/Ca and SST; r = -0.19, n = 67, p = 0.06 for Dd 18 O and rainfall), indicating its greater susceptibility to biological/metabolic effects. Our results suggest that while annually resolved coral records are potentially a valuable tool for determining, in particular, long timescale climate variability such as Pacific Decadal Oscillation, Interdecadal Pacific Oscillation, and other climatic factors, the selection of the coral sample is important, and replication is essential.

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“…Most of these are based on the temperature-dependent incorporation of divalent cations into coral skeletal aragonite. The use of coralline Sr/Ca ratios as a temperature proxy has received the most attention (Smith et al, 1979;Beck et al, 1992) though several other coral temperature proxies also have been proposed, most notably Mg/Ca ratios (Oomori et al, 1983;Mitsuguchi et al, 1996) and U/Ca ratios (Min et al, 1995;Shen and Dunbar, 1995). Other potential coral paleothermometers include B and F (Hart and Cohen, 1996) which occur as trace elements in seawater and coral ((1 ppm).…”

Section: Paleothermometrymentioning

confidence: 99%

New views of tropical paleoclimates from corals

Gagan

Ayliffe

Beck

et al. 2000

Quaternary Science Reviews

455

287

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Corals o!er a rich archive of past climate variability in tropical ocean regions where instrumental data are limited and where our knowledge of multi-decadal climate sensitivity is incomplete. In the eastern equatorial Paci"c, coral isotopic records track variations in ENSO-related changes in sea-surface temperature; further west, corals record variability in sea-surface temperature and rainfall that accompanies zonal displacement of the Indonesian Low during ENSO events. These multi-century records reveal previously unrecognised ENSO variability on time scales of decades to centuries. Outside the ENSO-sensitive equatorial Paci"c, long-term trends towards recent warmer/wetter conditions suggest the tropics respond to global forcings. New coral paleothermometers indicate that surface-ocean temperatures in the tropical southwestern Paci"c were depressed by 4}63C during the Younger Dryas climatic event and rose episodically during the next 4000 yr. High temporal-resolution measurements of Sr/Ca and O in corals provide information about the surface-ocean hydrologic balance and can resolve the seasonal balance between precipitation and evaporation. Radiocarbon measurements in corals, coupled with ocean circulation models, may be used to reconstruct near-surface ocean circulation, past mixing rates, and the distribution of fossil fuel CO in the upper ocean. Most recently, seasonal to interannual variations in the radiocarbon of corals from the equatorial Paci"c have been linked to the redistribution of surface waters associated with the ENSO.

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Mg/Ca Thermometry in Coral Skeletons

Cited by 338 publications

References 11 publications

Spatial and temporal variation in elemental signatures of statoliths from the Patagonian longfin squid (Loligo gahi)

Spatial and temporal variation in elemental signatures of statoliths from the Patagonian longfin squid (Loligo gahi)

Evaluation of annual resolution coral geochemical records as climate proxies in the Great Barrier Reef of Australia

New views of tropical paleoclimates from corals

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