Estimating regional coral reef calcium carbonate production from remotely sensed maps of seafloor character and reef structural complexity

Hamylton, Sarah, Duce, Stephanie, Vila-Concejo, Ana, Roelfsema, Chris M., Phinn, Stuart R., Carvalho, Rafael C., Shaw, Emily and Joyce, Karen E. (2017) Estimating regional coral reef calcium carbonate production from remotely sensed maps of seafloor character and reef structural complexity. Remote Sensing of Environment, 201 88-98. doi:10.1016/j.rse.2017.08.034


Author Hamylton, Sarah
Duce, Stephanie
Vila-Concejo, Ana
Roelfsema, Chris M.
Phinn, Stuart R.
Carvalho, Rafael C.
Shaw, Emily
Joyce, Karen E.
Title Estimating regional coral reef calcium carbonate production from remotely sensed maps of seafloor character and reef structural complexity
Journal name Remote Sensing of Environment   Check publisher's open access policy
ISSN 0034-4257
1879-0704
Publication date 2017-11-01
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.rse.2017.08.034
Open Access Status Not yet assessed
Volume 201
Start page 88
End page 98
Total pages 11
Place of publication New York, NY United States
Publisher Elsevier
Language eng
Abstract Carbonate production on coral reefs is responsible for the provision of beach sands, for the maintenance of seawater chemical balances and for the growth of reef structure and associated habitat complexity. Key carbonate producers including hard coral, crustose coralline algae, foraminiferal sand and Halimeda were mapped from satellite imagery (spatial resolution 2.5 m, mean overall accuracy = 81%) and an upscaling model was applied to estimate carbonate production. A sensitivity analysis was conducted to evaluate the influence of employing different calcification rates for live coral on the upscaling model. Contemporary coral reef carbonate production for the 21 reef platforms of the Capricorn-Bunker Group (southern Great Barrier Reef) is estimated to be between 489,000 and 659,000 t per year based on seawater chemistry, community composition, calcification rates and reef structural complexity (rugosity). The upscaling model was relatively insensitive to different parameterisations of live coral calcification employed, probably due to live coral being a relatively minor contributor by area (approximately 18% of total reef area throughout the study region). This suggests regional scale seafloor characteristics, such as percentage of area dominated by substrates prone to dissolution (e.g. coral rubble), have a strong bearing on calcium carbonate production and need to be given greater consideration The upscaling framework presented provides a new method for quantifying regional carbonate production that could be applied globally, and provides a valuable baseline against which future changes to carbonate production in this region can be assessed.
Keyword Remote sensing
Calcification
Climate change
Benthic change
Ocean acidification
Carbonate production
Coral reef
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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Created: Fri, 15 Sep 2017, 09:51:40 EST by Ashleigh Paroz on behalf of School of Earth and Environmental Sciences