Staff View: Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo

Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo

Dissolved iron (dFe) is essential for multiple biogeochemical reactions in oceans, such as photosynthesis, respiration and nitrogen fixation. Currently, large uncertainties remain regarding the input of riverine dFe into coastal oceans, especially in tropical rivers in southeastern Asia. In the pres...

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Main Authors:	Aazani, Mujahid, Mohd Fakharuddin, Muhamad, Xiaohui, Zhang, Moritz, Müller, Shan, Jiang, Ying, Wu, Xunchi, Zhu, Zhuoyi, Zhu, Sien, Edwin Aun Sia, Holt, Faddrine Ajon Jang, Jing, Zhang
Format:	Article
Language:	English
Published:	Copernicus Publications on behalf of the European Geosciences Union. 2020
Subjects:	GC Oceanography GE Environmental Sciences
Online Access:	http://ir.unimas.my/id/eprint/30875/1/fakharudin.pdf http://ir.unimas.my/id/eprint/30875/ https://bg.copernicus.org/articles/17/1805/2020/
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spelling	my.unimas.ir.308752021-04-01T03:41:45Z http://ir.unimas.my/id/eprint/30875/ Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo Aazani, Mujahid Mohd Fakharuddin, Muhamad Xiaohui, Zhang Moritz, Müller Shan, Jiang Ying, Wu Xunchi, Zhu Zhuoyi, Zhu Sien, Edwin Aun Sia Holt, Faddrine Ajon Jang Jing, Zhang GC Oceanography GE Environmental Sciences Dissolved iron (dFe) is essential for multiple biogeochemical reactions in oceans, such as photosynthesis, respiration and nitrogen fixation. Currently, large uncertainties remain regarding the input of riverine dFe into coastal oceans, especially in tropical rivers in southeastern Asia. In the present study, the concentrations of dFe and distribution patterns of dFe were determined along the salinity gradient in the Rajang River and three blackwater rivers that drain from peatlands, including the Maludam River, the Sebuyau River and the Simunjan River. In the Rajang River, the dFe concentration in freshwater samples (salinity < 1 PSU – practical salinity units) in the wet season (March 2017) was higher than that in the dry season (August 2016), which might be related to the resuspension of sediment particles and soil erosion from cropland. In the Rajang estuary, an intense removal of dFe in low-salinity waters (salinity < 15 PSU) was observed, which was likely due to salt-induced flocculation and absorption of dFe onto suspended particulate matter (SPM). However, increases in the dFe concentration in the wet season were also found, which may be related to dFe desorption from SPM and the influences of agricultural activities. In the blackwater rivers, the dFe concentration reached 44.2 µmol L−1 , indicating a strong contribution to the dFe budget from peatland leaching. The dFe flux derived from the Rajang estuary to the South China Sea was estimated to be 6.4±2.3×105 kg yr−1 . For blackwater rivers, the dFe flux was approximately 1.1 ± 0.5 × 105 kg yr−1 in the Maludam River. Anthropogenic activities may play an important role in the dFe yield, such as in the Serendeng tributary of the Rajang River and Simunjan River, where intensive oil palm plantations were observed. Copernicus Publications on behalf of the European Geosciences Union. 2020 Article PeerReviewed text en http://ir.unimas.my/id/eprint/30875/1/fakharudin.pdf Aazani, Mujahid and Mohd Fakharuddin, Muhamad and Xiaohui, Zhang and Moritz, Müller and Shan, Jiang and Ying, Wu and Xunchi, Zhu and Zhuoyi, Zhu and Sien, Edwin Aun Sia and Holt, Faddrine Ajon Jang and Jing, Zhang (2020) Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo. Biogeosciences, 17 (7). pp. 1805-1819. ISSN 1726-4189 https://bg.copernicus.org/articles/17/1805/2020/ DOI:org/10.5194/bg-17-1805-2020
institution	Universiti Malaysia Sarawak
building	Centre for Academic Information Services (CAIS)
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaysia Sarawak
content_source	UNIMAS Institutional Repository
url_provider	http://ir.unimas.my/
language	English
topic	GC Oceanography GE Environmental Sciences
spellingShingle	GC Oceanography GE Environmental Sciences Aazani, Mujahid Mohd Fakharuddin, Muhamad Xiaohui, Zhang Moritz, Müller Shan, Jiang Ying, Wu Xunchi, Zhu Zhuoyi, Zhu Sien, Edwin Aun Sia Holt, Faddrine Ajon Jang Jing, Zhang Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo
description	Dissolved iron (dFe) is essential for multiple biogeochemical reactions in oceans, such as photosynthesis, respiration and nitrogen fixation. Currently, large uncertainties remain regarding the input of riverine dFe into coastal oceans, especially in tropical rivers in southeastern Asia. In the present study, the concentrations of dFe and distribution patterns of dFe were determined along the salinity gradient in the Rajang River and three blackwater rivers that drain from peatlands, including the Maludam River, the Sebuyau River and the Simunjan River. In the Rajang River, the dFe concentration in freshwater samples (salinity < 1 PSU – practical salinity units) in the wet season (March 2017) was higher than that in the dry season (August 2016), which might be related to the resuspension of sediment particles and soil erosion from cropland. In the Rajang estuary, an intense removal of dFe in low-salinity waters (salinity < 15 PSU) was observed, which was likely due to salt-induced flocculation and absorption of dFe onto suspended particulate matter (SPM). However, increases in the dFe concentration in the wet season were also found, which may be related to dFe desorption from SPM and the influences of agricultural activities. In the blackwater rivers, the dFe concentration reached 44.2 µmol L−1 , indicating a strong contribution to the dFe budget from peatland leaching. The dFe flux derived from the Rajang estuary to the South China Sea was estimated to be 6.4±2.3×105 kg yr−1 . For blackwater rivers, the dFe flux was approximately 1.1 ± 0.5 × 105 kg yr−1 in the Maludam River. Anthropogenic activities may play an important role in the dFe yield, such as in the Serendeng tributary of the Rajang River and Simunjan River, where intensive oil palm plantations were observed.
format	Article
author	Aazani, Mujahid Mohd Fakharuddin, Muhamad Xiaohui, Zhang Moritz, Müller Shan, Jiang Ying, Wu Xunchi, Zhu Zhuoyi, Zhu Sien, Edwin Aun Sia Holt, Faddrine Ajon Jang Jing, Zhang
author_facet	Aazani, Mujahid Mohd Fakharuddin, Muhamad Xiaohui, Zhang Moritz, Müller Shan, Jiang Ying, Wu Xunchi, Zhu Zhuoyi, Zhu Sien, Edwin Aun Sia Holt, Faddrine Ajon Jang Jing, Zhang
author_sort	Aazani, Mujahid
title	Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo
title_short	Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo
title_full	Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo
title_fullStr	Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo
title_full_unstemmed	Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo
title_sort	distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of sarawak, malaysian borneo
publisher	Copernicus Publications on behalf of the European Geosciences Union.
publishDate	2020
url	http://ir.unimas.my/id/eprint/30875/1/fakharudin.pdf http://ir.unimas.my/id/eprint/30875/ https://bg.copernicus.org/articles/17/1805/2020/
_version_	1696979516504670208
score	13.211869

Distribution and flux of dissolved iron in the peatland-draining rivers and estuaries of Sarawak, Malaysian Borneo

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