Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, Malaysia
Chromophoric Dissolved Organic Matter (CDOM) is a vital water constituent in aquatic ecosystems that contributes to water colour, affects light penetration, and impacts primary production. This study aims to determine the spatial and monsoonal variability of CDOM absorption properties in the Likas e...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Oceanologia |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0078323422000549 |
| _version_ | 1811257810224152576 |
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| author | Saiyidah Munirah Mohd-Shazali Jafar-Sidik Madihah Nurzaliah Ali Chen Cheng-Ann Robert J.W. Brewin Md. Suffian Idris P. Purba Noir |
| author_facet | Saiyidah Munirah Mohd-Shazali Jafar-Sidik Madihah Nurzaliah Ali Chen Cheng-Ann Robert J.W. Brewin Md. Suffian Idris P. Purba Noir |
| author_sort | Saiyidah Munirah Mohd-Shazali |
| collection | DOAJ |
| description | Chromophoric Dissolved Organic Matter (CDOM) is a vital water constituent in aquatic ecosystems that contributes to water colour, affects light penetration, and impacts primary production. This study aims to determine the spatial and monsoonal variability of CDOM absorption properties in the Likas estuary, characterise the source of CDOM, and investigate the correlations between CDOM absorption properties and salinity. Likas estuary is a small estuary located in Kota Kinabalu city on the west coast of Sabah, facing the South China Sea. A mangrove ecosystem surrounds it with manufactured structures such as residential areas and public facilities. Surface water samples were collected at 19 stations: upstream of rivers to the river mouth and coastal area during spring tides every month, from June 2018 to July 2019, for 14-months. The distribution of aCDOM(440) in the study area is predictable as a signature in a coastal area with a decreasing gradient from the upstream towards coastal water (0.29 ± 0.19 m−1 to 1.05 ± 0.39 m−1). There are increasing spatial patterns of spectral slopes S275-295 and SR. However, S350-400 and S300-600 declined spatial gradients from the upstream to coastal water. Thus, S300-600 indicates a linear relationship between aCDOM(440), which unconventional results in coastal water. We suspect this is due to a small coverage of the study site with a distance of 0.5 m intervals of each station. This could be why the S300-600 had constant values throughout the study area (with no statistical difference between stations). In addition, S300-600 was merely varied in the stations located at the river mouth and coastal water. Based on the spectral slope ratio (SR), most of the stations located in the Darau, Inanam, and Bangka-Bangka rivers had SR values less than 1. Hence, CDOM in these stations is a terrestrial-dominated source. Therefore, from our observations during the study period, monsoonal variation could alter the source of CDOM in the study area. |
| first_indexed | 2024-04-12T18:03:23Z |
| format | Article |
| id | doaj.art-745eb939371c4d70bf2c366268c01820 |
| institution | Directory Open Access Journal |
| issn | 0078-3234 |
| language | English |
| last_indexed | 2024-04-12T18:03:23Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Oceanologia |
| spelling | doaj.art-745eb939371c4d70bf2c366268c018202022-12-22T03:22:04ZengElsevierOceanologia0078-32342022-10-01644583594Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, MalaysiaSaiyidah Munirah Mohd-Shazali0Jafar-Sidik Madihah1Nurzaliah Ali2Chen Cheng-Ann3Robert J.W. Brewin4Md. Suffian Idris5P. Purba Noir6Borneo Marine Research Institute, University of Malaysia of Sabah, Sabah, MalaysiaBorneo Marine Research Institute, University of Malaysia of Sabah, Sabah, Malaysia; Corresponding author at: Borneo Marine Research Institute, Universiti Malaysia Sabah, Jalan UMS 88400, Kota Kinabalu, Sabah, Malaysia.Borneo Marine Research Institute, University of Malaysia of Sabah, Sabah, MalaysiaBorneo Marine Research Institute, University of Malaysia of Sabah, Sabah, MalaysiaCentre for Geography and Environmental Science, College of Life and Environmental Sciences, University of Exeter, Penryn, Cornwall, United KingdomFaculty of Science and Marine Environment, University of Malaysia Terengganu, Terengganu, MalaysiaMarine Research Laboratory (MEAL), Faculty of Fishery and Marine Science, Padjadjaran University, Jatinangor, IndonesiaChromophoric Dissolved Organic Matter (CDOM) is a vital water constituent in aquatic ecosystems that contributes to water colour, affects light penetration, and impacts primary production. This study aims to determine the spatial and monsoonal variability of CDOM absorption properties in the Likas estuary, characterise the source of CDOM, and investigate the correlations between CDOM absorption properties and salinity. Likas estuary is a small estuary located in Kota Kinabalu city on the west coast of Sabah, facing the South China Sea. A mangrove ecosystem surrounds it with manufactured structures such as residential areas and public facilities. Surface water samples were collected at 19 stations: upstream of rivers to the river mouth and coastal area during spring tides every month, from June 2018 to July 2019, for 14-months. The distribution of aCDOM(440) in the study area is predictable as a signature in a coastal area with a decreasing gradient from the upstream towards coastal water (0.29 ± 0.19 m−1 to 1.05 ± 0.39 m−1). There are increasing spatial patterns of spectral slopes S275-295 and SR. However, S350-400 and S300-600 declined spatial gradients from the upstream to coastal water. Thus, S300-600 indicates a linear relationship between aCDOM(440), which unconventional results in coastal water. We suspect this is due to a small coverage of the study site with a distance of 0.5 m intervals of each station. This could be why the S300-600 had constant values throughout the study area (with no statistical difference between stations). In addition, S300-600 was merely varied in the stations located at the river mouth and coastal water. Based on the spectral slope ratio (SR), most of the stations located in the Darau, Inanam, and Bangka-Bangka rivers had SR values less than 1. Hence, CDOM in these stations is a terrestrial-dominated source. Therefore, from our observations during the study period, monsoonal variation could alter the source of CDOM in the study area.http://www.sciencedirect.com/science/article/pii/S0078323422000549Coloured dissolved organic matter (CDOM)The absorption coefficient of CDOM (aCDOM)Molecular weight and degradation of CDOMHigh molecular weight (HMW) CDOMLow molecular weight (LMW) CDOM |
| spellingShingle | Saiyidah Munirah Mohd-Shazali Jafar-Sidik Madihah Nurzaliah Ali Chen Cheng-Ann Robert J.W. Brewin Md. Suffian Idris P. Purba Noir Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, Malaysia Oceanologia Coloured dissolved organic matter (CDOM) The absorption coefficient of CDOM (aCDOM) Molecular weight and degradation of CDOM High molecular weight (HMW) CDOM Low molecular weight (LMW) CDOM |
| title | Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, Malaysia |
| title_full | Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, Malaysia |
| title_fullStr | Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, Malaysia |
| title_full_unstemmed | Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, Malaysia |
| title_short | Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, Malaysia |
| title_sort | dynamics of absorption properties of cdom and its composition in likas estuary north borneo malaysia |
| topic | Coloured dissolved organic matter (CDOM) The absorption coefficient of CDOM (aCDOM) Molecular weight and degradation of CDOM High molecular weight (HMW) CDOM Low molecular weight (LMW) CDOM |
| url | http://www.sciencedirect.com/science/article/pii/S0078323422000549 |
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