High-resolution carbon and oxygen isotope records from a scleractinian (Porites) coral of Lakshadweep Archipelago

Ahmad, Shoeb; Padmakumari, V. M.; Raza, Waseem; Venkatesham, K.; Suseela, Gorti; Sagar, Netramani; Chamoli, Ashutosh; Rajan, Rajkumar

doi:10.1016/j.quaint.2009.11.020

Cited by 33 publications

(9 citation statements)

References 46 publications

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Section: Monsoon Dynamics Recorded By the Coralsupporting

confidence: 93%

“…The SW monsoon accounting for about 80% rainfall over India is highly important to Indian agriculture and society. At Lakshadweep Archipelago, our study site, the onset of the SW monsoon in June causes a sharp decrease in summer temperature on the order of 2–4°C [ Chakraborty and Ramesh , ; Ahmad et al ., ]. The increasing values of our coral‐Sr/Ca record from May to August (Figure c), following the ERSST trend and coinciding with the SW precipitation months, are a robust indicator of monsoon‐induced sea surface temperature cooling in the study region.…”

Section: Discussionmentioning

confidence: 99%

“…This reduction in temperature is recorded in corals from this region, as evidenced from previous isotopic studies (δ 18 O) of Porites sp. [ Chakraborty and Ramesh , ; Ahmad et al ., ] and Favia speciosa [ Chakraborty and Ramesh , ].…”

Section: Introductionmentioning

confidence: 99%

“…Massive Porites sp. corals have frequently been used as archives for highresolution paleoclimatic reconstructions [Smith et al, 1979;P€ atzold, 1984;Beck et al, 1992;Chakraborty and Ramesh, 1993;Pfeiffer and Dullo, 2006;Ahmad et al, 2011;Cahyarini et al, 2014]. As instrument-derived observations cover only the last few decades, scleractinian Porites sp.…”

Section: Introductionmentioning

confidence: 99%

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High‐resolution Sr/Ca ratios in a Porites lutea coral from Lakshadweep Archipelago, southeast Arabian Sea: An example from a region experiencing steady rise in the reef temperature

et al. 2016

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Here we present the first record of Sr/Ca variability in a massive Porites lutea coral from the Lakshadweep Archipelago, Arabian Sea. The annual mean sea surface temperature (SST) in this region and the surrounding areas has increased steadily in the recent past. During some major El Niño events, SSTs are even higher, imposing additional thermal‐stress on corals, episodically leading to coral bleaching. We infer from the coral‐Sr/Ca record (1981–2008) that during some of these events high and persistent SSTs lead to a dampening of the temperature signal in coral‐Sr/Ca, impairing the coral's ability to record full scale warming. Thus, coral‐Sr/Ca may provide a history of past El Niño Southern‐Oscillation (ENSO) induced thermal‐stress episodes, which are a recurrent feature also seen in cross‐spectral analysis between coral‐Sr/Ca and the Nino3.4 index. Despite the impact of episodical thermal‐stress during major El Niño events, our coral proxy faithfully records the seasonal monsoon‐induced summer cooling on the order of ∼2.3°C. Calibration of coral‐Sr/Ca with instrumental grid‐SST data shows significant correlation to regional SST and monsoon variability. Hence, massive Porites corals of this region are highly valuable archives for reconstructing long‐term changes in SST, strongly influenced by monsoon variability on seasonal scales. More importantly, our data show that this site with increasing SST is an ideal location for testing the future effects of the projected anthropogenic SST increase on coral reefs that are already under thermal‐stress worldwide.

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Section: Monsoon Dynamics Recorded By the Coralsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High‐resolution Sr/Ca ratios in a Porites lutea coral from Lakshadweep Archipelago, southeast Arabian Sea: An example from a region experiencing steady rise in the reef temperature

et al. 2016

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“…Of specific relevance to this project is the use of O and C stable isotope profiles in testing for seasonal upwelling, mostly in molluscs, but also corals and fish otoliths (Andrus et al 2002, Tao and Grossman 2010, Ahmad et al 2011, Sadler et al 2012.…”

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confidence: 99%

Stable isotope profiling in moderate marine bryozoan colonies across the Isthmus of Panama

2013

BMS

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In the tropics, upwelling of cold, deep water is the principal source of major seasonal fluctuations in temperature. Along the tropical eastern Pacific (TEP) coast of the Isthmus of Panama, seasonal upwelling induces corresponding drops in temperature. Upwelling does not occur along the southwestern Caribbean (SWC) coast of the isthmus. Our goal was to use these oceanographic differences to test the use of stable isotope profiles of free-living modern cupuladriid bryozoans as a method for quantifying paleo-seasonality. We determined O and C stable isotope values from micromilled carbonates profiled along the growth axis in three colonies of Cupuladria exfragminis Herrera-Cubilla, Dick, Sanner and Jackson, 2006 from the upwelling Gulf of Panama in TEP and three colonies of Cupuladria surinamensis Cadée, 1975 from the non-upwelling Bocas del Toro Archipelago in SWC. Pacific colonies had inter-colony δ 18 O carb values ranging from −2.1‰ to −0.2‰ on the international Vienna Pee Dee Belemnite scale, whereas SWC colonies ranged from −1.7‰ to −0.6‰. Pacific colonies consistently reveal cyclical trends in δ 18 O carb that are absent in the Caribbean colonies. Based on published measurements of temperature, salinity, and δ 18 O sw , the ≤2.5 yrs of cyclicity seen in the Pacific colonies reflects a combination of seasonal freshening and seasonal upwelling of colder water. is preliminary study suggests the potential for more exploration of bryozoans as a source of paleoclimate proxies.

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Climatic Variability and Anthropogenic Forcing on Marine Ecosystems: Evidence from the Lakshadweep Archipelago

Fousiya

Malik²,

Chakraborty³

2023

Coasts, Estuaries and Lakes

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High-resolution carbon and oxygen isotope records from a scleractinian (Porites) coral of Lakshadweep Archipelago

Cited by 33 publications

References 46 publications

High‐resolution Sr/Ca ratios in a Porites lutea coral from Lakshadweep Archipelago, southeast Arabian Sea: An example from a region experiencing steady rise in the reef temperature

High‐resolution Sr/Ca ratios in a Porites lutea coral from Lakshadweep Archipelago, southeast Arabian Sea: An example from a region experiencing steady rise in the reef temperature

Stable isotope profiling in moderate marine bryozoan colonies across the Isthmus of Panama

Climatic Variability and Anthropogenic Forcing on Marine Ecosystems: Evidence from the Lakshadweep Archipelago

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