Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters

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 light‐absorbent chromophoric dissolved organic matter (CDOM), it may also reduce the amount of sunlight availabl...

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Main Authors: Kaushal, Nikita, Sanwlani, Nivedita, Tanzil, Jani T. I., Cherukuru, Nagur, Sahar, Syamil, Müller, Moritz, Mujahid, Aazani, Lee, Jen N., Goodkin, Nathalie Fairbank, Martin, Patrick
Other Authors: Asian School of the Environment
Format: Journal Article
Language:English
Published: 2021
Subjects:
Online Access:https://hdl.handle.net/10356/147908
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author Kaushal, Nikita
Sanwlani, Nivedita
Tanzil, Jani T. I.
Cherukuru, Nagur
Sahar, Syamil
Müller, Moritz
Mujahid, Aazani
Lee, Jen N.
Goodkin, Nathalie Fairbank
Martin, Patrick
author2 Asian School of the Environment
author_facet Asian School of the Environment
Kaushal, Nikita
Sanwlani, Nivedita
Tanzil, Jani T. I.
Cherukuru, Nagur
Sahar, Syamil
Müller, Moritz
Mujahid, Aazani
Lee, Jen N.
Goodkin, Nathalie Fairbank
Martin, Patrick
author_sort Kaushal, Nikita
collection NTU
description 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 light‐absorbent 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 land‐to‐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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spelling ntu-10356/1479082023-02-28T16:40:07Z Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters Kaushal, Nikita Sanwlani, Nivedita Tanzil, Jani T. I. Cherukuru, Nagur Sahar, Syamil Müller, Moritz Mujahid, Aazani Lee, Jen N. Goodkin, Nathalie Fairbank Martin, Patrick Asian School of the Environment Earth Observatory of Singapore Science::Geology CDOM DOC 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 light‐absorbent 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 land‐to‐ocean tDOM flux from this protected peatland catchment, and suggests an additional impact by solar radiation, which degrades tDOM at sea. Ministry of Education (MOE) National Research Foundation (NRF) Published version This work was funded through a Singapore Ministry of Education Academic Research Fund Tier 1 grant to P.M. (RG123/18), a National Research Foundation (NRF) – Royal Society Commonwealth Postdoctoral Fellowship to N.K. (NRF-SCS-ICFC2017-01), and the Singapore NRF Fellowship scheme awarded to N. G. (NRFF-2012-03), administered by Earth Observatory of Singapore under the Research Centres of Excellence initiative. N.C. acknowledges Australian Academy of Sciences funding support through Regional Collaborations Programme for continued development of the remote sensing model. M.M. acknowledges funding from the Sarawak Multimedia Authority under the Sarawak Digital Centre of Excellence. A.M. acknowledges GRA and research funding under GL/F07/UMS/07/2017. J.N. acknowledges funding from Malaysia Fundamental Research Grant Scheme (FRGS/2/2013/STWN04/UMT/03/1). 2021-05-06T05:52:57Z 2021-05-06T05:52:57Z 2021 Journal Article Kaushal, N., Sanwlani, N., Tanzil, J. T. I., Cherukuru, N., Sahar, S., Müller, M., Mujahid, A., Lee, J. N., Goodkin, N. F. & Martin, P. (2021). Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters. Geophysical Research Letters, 48(8), e2020GL092130-. https://dx.doi.org/10.1029/2020GL092130 1944-8007 https://hdl.handle.net/10356/147908 10.1029/2020GL092130 8 48 e2020GL092130 en Ministry of Education Singapore. Grant Number: RG123/18 National Research Foundation Singapore. Grant Number: NRF‐SCS‐ICFC2017‐01 National Research Foundation Singapore. Grant Number: NRFF‐2012‐03 Graduate Research Assistant. Grant Number: GL/F07/UMS/07/2017 Malaysia Fundamental Research Grant Scheme. Grant Number: FRGS/2/2013/STWN04/UMT/03/1 Geophysical Research Letters https://doi.org/10.21979/N9/5CZV22 © 2021 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. application/pdf
spellingShingle Science::Geology
CDOM
DOC
Kaushal, Nikita
Sanwlani, Nivedita
Tanzil, Jani T. I.
Cherukuru, Nagur
Sahar, Syamil
Müller, Moritz
Mujahid, Aazani
Lee, Jen N.
Goodkin, Nathalie Fairbank
Martin, Patrick
Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters
title Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters
title_full Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters
title_fullStr Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters
title_full_unstemmed Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters
title_short Coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters
title_sort coral skeletal luminescence records changes in terrestrial chromophoric dissolved organic matter in tropical coastal waters
topic Science::Geology
CDOM
DOC
url https://hdl.handle.net/10356/147908
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