Geochemistry and skeletal structure of Diploria strigosa, implications for coral-based climate reconstruction

Giry, Cyril; Felis, Thomas; Kölling, Martin; Scheffers, Sander

doi:10.1016/j.palaeo.2010.10.022

Cited by 41 publications

(74 citation statements)

References 93 publications

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“…We implement Sr/Ca palaeothermometry on precisely dated fossil specimens of D. strigosa corals that inhabited the shallow tropical waters of the southern Caribbean island of Bonaire (Caribbean Netherlands). The annually banded aragonite skeleton of D. strigosa is suitable for precision microsampling techniques (Hetzinger et al, 2006(Hetzinger et al, , 2010Giry et al, 2010Giry et al, , 2012Giry et al, , 2013Felis et al, 2015). Coral Sr/Ca variations are a well-established proxy for SST variability on seasonal (Gagan et al, 1998), interannual (Felis et al, 2009) and multidecadal time scales (Linsley et al, 2000).…”

Section: E-mail Address: Wbrocas@marumde (Wm Brocas)mentioning

confidence: 99%

“…Seven colonies were selected based on their suitability to produce the longest and most reliable geochemical records, while reflecting the broad geographical range of material retrieved from Bonaire. This study followed established procedures outlined by Felis et al (2009), Giry et al (2010Giry et al ( , 2012.…”

Section: Coral Materialsmentioning

confidence: 99%

“…X-radiography also serves to highlight regions within the coral slab to be avoided due to abnormally high or low density that likely results from diagenetic alteration. The dense theca skeletal element has been previously identified as the most suitable target source within D. strigosa for yielding Sr/Ca records (Hetzinger et al, 2006;Giry et al, 2010). Once the target theca was identified within each of the seven selected colonies, parallel sections of mixed coralline skeletal elements were screened for preservation.…”

Section: Screening For Diagenesismentioning

confidence: 99%

“…An estimate of average coral growth rates was made with further reference to the annual density bands seen in the X-radiographs. Based on these rates, continuous microsampling paths of either 0.4 or 0.5 mm interval spacing along the theca were used to ensure that approximately twelve samples were obtained per year, in accordance with established procedures (Giry et al, 2010(Giry et al, , 2012Felis et al, 2015). These sampling paths were created using a 0.6 mm diameter drill bit along the centre of the theca, to a depth of 2 mm.…”

Section: Microsampling Sr/ca Analysis Chronology Building and Spectmentioning

confidence: 99%

“…Annual maximum and minimum Sr/Ca values were therefore assigned as tie-points to the coldest (February/March) and warmest (September/October) months, respectively. Monthly time series were generated by following the established procedures of Felis et al (2009) and Giry et al (2010). Thereby, a monthly time series of Sr/Ca results from linear interpolation between these tie-points and subsequent interpolation to monthly resolution.…”

Section: Microsampling Sr/ca Analysis Chronology Building and Spectmentioning

confidence: 99%

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Last interglacial temperature seasonality reconstructed from tropical Atlantic corals

Brocas

Felis

Obert

et al. 2016

Earth and Planetary Science Letters

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Editor: M. Frank Keywords:coral Sr/Ca the last interglacial Caribbean climate sea surface temperature seasonality quasi-biennial to decadal variability Reconstructions of last interglacial (LIG, MIS 5e, ∼127-117 ka) climate offer insights into the natural response and variability of the climate system during a period partially analogous to future climate change scenarios. We present well preserved fossil corals (Diploria strigosa) recovered from the southern Caribbean island of Bonaire (Caribbean Netherlands). These have been precisely dated by the 230 Th/Umethod to between 130 and 120 ka ago. Annual banding of the coral skeleton enabled construction of time windows of monthly resolved strontium/calcium (Sr/Ca) temperature proxy records. In conjunction with a previously published 118 ka coral record, our eight records of up to 37 years in length, cover a total of 105 years within the LIG period. From these, sea surface temperature (SST) seasonality and variability in the tropical North Atlantic Ocean is reconstructed. We detect similar to modern SST seasonality of ∼2.9 • C during the early (130 ka) and the late LIG (120-118 ka). However, within the mid-LIG, a significantly higher than modern SST seasonality of 4.9 • C (at 126 ka) and 4.1 • C (at 124 ka) is observed. These findings are supported by climate model simulations and are consistent with the evolving amplitude of orbitally induced changes in seasonality of insolation throughout the LIG, irrespective of wider climatic instabilities that characterised this period. The climate model simulations suggest that the SST seasonality changes documented in our LIG coral Sr/Ca records are representative of larger regions within the tropical North Atlantic. These simulations also suggest that the reconstructed SST seasonality increase during the mid-LIG is caused primarily by summer warming. A 124 ka old coral documents, for the first time, evidence of decadal SST variability in the tropical North Atlantic during the LIG, akin to that observed in modern instrumental records.

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Section: E-mail Address: Wbrocas@marumde (Wm Brocas)mentioning

confidence: 99%

Section: Coral Materialsmentioning

confidence: 99%

Section: Screening For Diagenesismentioning

confidence: 99%

Section: Microsampling Sr/ca Analysis Chronology Building and Spectmentioning

confidence: 99%

Section: Microsampling Sr/ca Analysis Chronology Building and Spectmentioning

confidence: 99%

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Last interglacial temperature seasonality reconstructed from tropical Atlantic corals

Brocas

Felis

Obert

et al. 2016

Earth and Planetary Science Letters

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Impact of warming events on reef‐scale temperature variability as captured in two Little Cayman coral Sr/Ca records

Reumont

Hetzinger

Garbe‐Schönberg³

et al. 2016

Geochem Geophys Geosyst

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The rising temperature of the world's oceans is affecting coral reef ecosystems by increasing the frequency and severity of bleaching and mortality events. The susceptibility of corals to temperature stress varies on local and regional scales. Insights into potential controlling parameters are hampered by a lack of long term in situ data in most coral reef environments and sea surface temperature (SST) products often do not resolve reef-scale variations. Here we use 42 years of coral Sr/Ca data to reconstruct seasonal-to decadal-scale SST variations in two adjacent but distinct reef environments at Little Cayman, Cayman Islands. Our results indicate that two massive Diploria strigosa corals growing in the lagoon and in the fore reef responded differently to past warming events. Coral Sr/Ca data from the shallow lagoon successfully record high summer temperatures confirmed by in situ observations (>338C). Surprisingly, coral Sr/Ca from the deeper fore reef is strongly affected by thermal stress events, although seasonal temperature extremes and mean SSTs at this site are reduced compared to the lagoon. The shallow lagoon coral showed decadal variations in Sr/Ca, supposedly related to the modulation of lagoonal temperature through varying tidal water exchange, influenced by the 18.6 year lunar nodal cycle. Our results show that reef-scale SST variability can be much larger than suggested by satellite SST measurements. Thus, using coral SST proxy records from different reef zones combined with in situ observations will improve conservation programs that are developed to monitor and predict potential thermal stress on coral reefs.

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Climatic Constraints on Growth Rate and Geochemistry (Sr/Ca and U/Ca) of the Coral Siderastrea stellata in the Southwest Equatorial Atlantic (Rocas Atoll, Brazil)

Evangelista

Sifeddine

Corrège

et al. 2018

Geochem Geophys Geosyst

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Although relatively rare compared to similar latitudes in the Pacific or Indian Oceans, massive coral colonies are present in the Tropical/Equatorial Southwestern Atlantic Ocean. However, detailed geochemical compositions of these corals are still largely unknown. In this work, we present growth rates, Sr/Ca, and U/Ca ratios of the coral colony (Siderastrea stellata) sampled at Rocas Atoll, off the Brazilian coast. These variables are primarily affected by sea surface temperature (SST) at seasonal scale, and by wind stress at interannual scale, these results represent a broad new finding. A lower significance at the interannual time scale between Sr/Ca and U/Ca with respect to SST is attributed to the low SST amplitude closed to Equator. An investigation on the dependence of coral growth rates with respect to the “cloud shading effect” promoted by the Intertropical Convergence Zone (ITCZ) does not show significant influence. Additionally, rain seems to act on local geochemistry of Sr/Ca ratios and growth rate at the decadal scale.

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Geochemistry and skeletal structure of Diploria strigosa, implications for coral-based climate reconstruction

Cited by 41 publications

References 93 publications

Last interglacial temperature seasonality reconstructed from tropical Atlantic corals

Last interglacial temperature seasonality reconstructed from tropical Atlantic corals

Impact of warming events on reef‐scale temperature variability as captured in two Little Cayman coral Sr/Ca records

Climatic Constraints on Growth Rate and Geochemistry (Sr/Ca and U/Ca) of the Coral Siderastrea stellata in the Southwest Equatorial Atlantic (Rocas Atoll, Brazil)

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