Coral carbon isotope sensitivity to growth rate and water depth with paleo-sea level implications

Linsley, Braddock K.; Dunbar, Robert B.; Dassié, Emilie P.; Tangri, Neil; Wu, Henry C.; Brenner, Logan D.; Wellington, Gerard M.

doi:10.1038/s41467-019-10054-x

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Coral carbon isotope sensitivity to growth rate and water depth with paleo-sea level implications

2019
By Linsley, Braddock K. ; Dunbar, Robert B. ; Dassié, Emilie P. ; ...
Source: Nat Commun. 2019; 10: 2056.

[PDF-1.13 MB]

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Details:

Journal Title:

Nature Communications
Personal Author:

Linsley, Braddock K. ; Dunbar, Robert B. ; Dassié, Emilie P. ; Tangri, Neil ; Wu, Henry C. ; ... More +

Linsley, Braddock K. ; Dunbar, Robert B. ; Dassié, Emilie P. ; Tangri, Neil ; Wu, Henry C. ; Brenner, Logan D. ; Wellington, Gerard M. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

Although reef coral skeletal carbon isotopes (δ13C) are routinely measured, interpretation remains controversial. Here we show results of a consistent inverse relationship between coral δ13C and skeletal extension rate over the last several centuries in Porites corals at Fiji, Tonga, Rarotonga and American Samoa in the southwest Pacific. Beginning in the 1950s, this relationship breaks down as the atmospheric 13C Suess effect shifts skeletal δ13C > 1.0‰ lower. We also compiled coral δ13C from a global array of sites and find that mean coral δ13C decreases by −1.4‰ for every 5 m increase in water depth (R = 0.68, p < 0.01). This highlights the fundamental sensitivity of coral δ13C to endosymbiotic photosynthesis. Collectively, these results suggest that photosynthetic rate largely determines mean coral δ13C while changes in extension rate and metabolic effects over time modulate skeletal δ13C around this mean value. The newly quantified coral δ13C-water depth relationship may be an effective tool for improving the precision of paleo-sea level reconstruction using corals.
Keywords:

[+]

Corals Growth
Source:

Nat Commun. 2019; 10: 2056.
DOI:

https://doi.org/10.1038/s41467-019-10054-x
Pubmed ID:

31053736
Pubmed Central ID:

PMC6499886
Document Type:

Journal Article
Funding:

Grant no. NA96GP0406
Rights Information:

CC BY
Compliance:

PMC
Main Document Checksum:

[+]

urn:sha256:c8f25f3515b6fe3f8edebae8a76897160bc23e14cf92cf20acaaeb9e14aecd0d
Download URL:

https://repository.library.noaa.gov/view/noaa/27605/noaa_27605_DS1.pdf
File Type:

	Author Correction	htm
	Available dataset	htm

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