Coral Skeletal Luminescence Records Changes in Terrestrial Chromophoric Dissolved Organic Matter in Tropical Coastal Waters
t Terrigenous dissolved organic matter (tDOM) carried by rivers represents an important carbon flux to the coastal ocean, which is thought to be increasing globally. Because tDOM is rich in lightabsorbent chromophoric dissolved organic matter (CDOM), it may also reduce the amount of sunlight avail...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/37768/1/Coral%20Skeletal%20Luminescence%20Records%20Changes%20in.pdf http://ir.unimas.my/id/eprint/37768/ https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL092130 |
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| Summary: | t Terrigenous dissolved organic matter (tDOM) carried by rivers represents an important
carbon flux to the coastal ocean, which is thought to be increasing globally. Because tDOM is rich in lightabsorbent chromophoric dissolved organic matter (CDOM), it may also reduce the amount of sunlight
available in coastal ecosystems. Despite its biogeochemical and ecological significance, there are few
long-term records of tDOM, hindering our understanding of its drivers and dynamics. Corals incorporate
terrestrial humic acids, an important constituent of CDOM, resulting in luminescent bands that have
been previously linked to rainfall and run-off. We show that luminescence green-to-blue (G/B) ratios in a
coral core growing in waters affected by peatland run-off correlate strongly with remote sensing-derived
CDOM absorption. The 24-year monthly resolution reconstructed record shows that rainfall controls landto-ocean tDOM flux from this protected peatland catchment, and suggests an additional impact by solar
radiation, which degrades tDOM at sea. |
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