Preprints
https://doi.org/10.5194/egusphere-2024-3547
https://doi.org/10.5194/egusphere-2024-3547
25 Nov 2024
 | 25 Nov 2024
Status: this preprint is open for discussion.

Estimation of particulate organic carbon export to the ocean from lateral degradations of tropical peatland coasts

Hiroki Kagawa, Koichi Yamamoto, Sigit Sutikno, Muhammad Haidar, Noerdin Basir, Atsushi Koyama, Ariyo Kanno, Yoshihisa Akamatsu, and Motoyuki Suzuki

Abstract. The amount of particulate organic carbon (POC) export to the ocean due to coastal erosion and peat mass movement events on Bengkalis Island, Indonesia, was estimated. The annual flux of POC to the ocean due to coastal erosion along the research area of Bengkalis Island was estimated to be in the range of 2.06 to 7.60 tC m−1 yr−1. POC exports to the ocean by events of peat mass movement along the coast of the northern part of Bengkalis Island were estimated in a range of 1.43 to 5.41 tC m−1, with an average increase of 2.23 tC m-1 from 2010 to 2018. The estimation of the POC flux was carried out by combining the analysis of the peat soil and the estimation of the volume of exported peat using aerial photogrammetry and satellite imagery analysis. A linear relationship was found between the area affected by the landslide and the volume of the peat soil divided by area. Coastal erosion and peat mass movements occurred in a chain of events, confirming that peat from coastal areas was exported to the ocean. Annual export of POC from coastal erosion for 1 m was equivalent to annual carbon emissions from degraded peatlands of 0.41 to 1.52 hectares. The carbon export rate per metre from events of peat mass movement corresponds to carbon emissions produced over one year of 0.29 to 1.08 hectares of degraded peatlands. On a peatland coast with an average length of 3,152 metres, the amount of POC exported to the ocean due to events of peat mass movement was estimated to range from 4.45 to 17.1 ktC, while the POC exported due to coastal erosion was estimated to range from 6.35 to 23.9 ktC yr-1. These lateral carbon exports on the tropical peatland coast indicate a new route of carbon export to the ocean, in addition to the common riverine discharge of organic carbon.

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Hiroki Kagawa, Koichi Yamamoto, Sigit Sutikno, Muhammad Haidar, Noerdin Basir, Atsushi Koyama, Ariyo Kanno, Yoshihisa Akamatsu, and Motoyuki Suzuki

Status: open (until 06 Jan 2025)

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Hiroki Kagawa, Koichi Yamamoto, Sigit Sutikno, Muhammad Haidar, Noerdin Basir, Atsushi Koyama, Ariyo Kanno, Yoshihisa Akamatsu, and Motoyuki Suzuki
Hiroki Kagawa, Koichi Yamamoto, Sigit Sutikno, Muhammad Haidar, Noerdin Basir, Atsushi Koyama, Ariyo Kanno, Yoshihisa Akamatsu, and Motoyuki Suzuki

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Short summary
This study elucidated the carbon export that has never been highlighted before, such as coastal peat mass movements and coastal erosion in tropical peatlands. The flux of POC exported to the ocean in the northern part of Bengkalis Island, Indonesia was estimated to range from 2.06 to 7.60 tC m-1 yr-1 due to coastal erosion and from 1.43 to 5.41 tC m-1 due to peat mass movement events. A significant amount of carbon is continuously released to the ocean.