Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models

Southeast Asia contains most of the world’s tropical peat carbon pool. In recent decades, intensive peatland conversion for commercial activities has led to the rise in terrigenous dissolved organic carbon (DOC) concentration in coastal waters, which has many repercussions on coastal ecosystems. Opt...

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Main Author: Wee, Shi Jun
Other Authors: Sang-Ho Yun
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2023
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Online Access:https://hdl.handle.net/10356/165747
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1657472023-04-10T15:32:04Z Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models Wee, Shi Jun Sang-Ho Yun Asian School of the Environment sangho.yun@ntu.edu.sg Science::Geology Social sciences::Geography::Oceanography Social sciences::Geography::Environmental sciences Social sciences::Geography::Water Southeast Asia contains most of the world’s tropical peat carbon pool. In recent decades, intensive peatland conversion for commercial activities has led to the rise in terrigenous dissolved organic carbon (DOC) concentration in coastal waters, which has many repercussions on coastal ecosystems. Optical remote sensing has emerged as an effective tool to monitor these impacts over large areas at high spatiotemporal resolutions. A recent study has applied a semi-analytical inversion model, parametrized with regional field measurements, to estimate the concentrations of DOC, colored dissolved organic matter (CDOM), and total suspended sediments (TSS) off peatland-rich Northwest Borneo. However, such studies remain lacking in other parts of Southeast Asia. To bridge this gap, we demonstrate the applicability of the aforementioned model in other coastal waters of Southeast Asia using MODIS-Aqua data. We incorporated field measurements from the Singapore Strait (2019–2020) into a regional spectral library and applied the algorithm to several parts of Southeast Asia. In NW Borneo, the model fit improved with the absolute mean relative percentage difference (MRPD) between the modelled and observed backscattering albedo decreasing by 2.72 ± 3.56 %. At the Malacca, Singapore, and west Karimata Strait, MRPD was generally small in coastal waters and estimates of DOC, CDOM, and TSS fell within the range of measurements from Sarawak and Singapore Strait. The model clearly reflected the spatial and temporal (multi-year) variability in each biogeochemical parameter. Overall, the semi-analytical model has a strong ability to monitor biogeochemical changes in Southeast Asia coastal waters beyond NW Borneo. Bachelor of Science in Environmental Earth Systems Science 2023-04-10T01:50:37Z 2023-04-10T01:50:37Z 2023 Final Year Project (FYP) Wee, S. J. (2023). Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/165747 https://hdl.handle.net/10356/165747 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Geology
Social sciences::Geography::Oceanography
Social sciences::Geography::Environmental sciences
Social sciences::Geography::Water
spellingShingle Science::Geology
Social sciences::Geography::Oceanography
Social sciences::Geography::Environmental sciences
Social sciences::Geography::Water
Wee, Shi Jun
Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models
description Southeast Asia contains most of the world’s tropical peat carbon pool. In recent decades, intensive peatland conversion for commercial activities has led to the rise in terrigenous dissolved organic carbon (DOC) concentration in coastal waters, which has many repercussions on coastal ecosystems. Optical remote sensing has emerged as an effective tool to monitor these impacts over large areas at high spatiotemporal resolutions. A recent study has applied a semi-analytical inversion model, parametrized with regional field measurements, to estimate the concentrations of DOC, colored dissolved organic matter (CDOM), and total suspended sediments (TSS) off peatland-rich Northwest Borneo. However, such studies remain lacking in other parts of Southeast Asia. To bridge this gap, we demonstrate the applicability of the aforementioned model in other coastal waters of Southeast Asia using MODIS-Aqua data. We incorporated field measurements from the Singapore Strait (2019–2020) into a regional spectral library and applied the algorithm to several parts of Southeast Asia. In NW Borneo, the model fit improved with the absolute mean relative percentage difference (MRPD) between the modelled and observed backscattering albedo decreasing by 2.72 ± 3.56 %. At the Malacca, Singapore, and west Karimata Strait, MRPD was generally small in coastal waters and estimates of DOC, CDOM, and TSS fell within the range of measurements from Sarawak and Singapore Strait. The model clearly reflected the spatial and temporal (multi-year) variability in each biogeochemical parameter. Overall, the semi-analytical model has a strong ability to monitor biogeochemical changes in Southeast Asia coastal waters beyond NW Borneo.
author2 Sang-Ho Yun
author_facet Sang-Ho Yun
Wee, Shi Jun
format Final Year Project
author Wee, Shi Jun
author_sort Wee, Shi Jun
title Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models
title_short Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models
title_full Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models
title_fullStr Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models
title_full_unstemmed Monitoring dissolved organic carbon concentration in coastal waters of Southeast Asia using remote sensing semi-analytical inversion models
title_sort monitoring dissolved organic carbon concentration in coastal waters of southeast asia using remote sensing semi-analytical inversion models
publisher Nanyang Technological University
publishDate 2023
url https://hdl.handle.net/10356/165747
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