Dynamics of dissolved O2, CO2, CH4, and N2O in a tropical coastal swamp in southern Thailand |
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| Authors: | Shingo Ueda Chun-Sim U Go Takahito Yoshioka Naohiro Yoshida ast; Eitaro Wada Toshihiro Miyajima ast ast; Atsuko Sugimoto Narin Boontanon Pisoot Vijarnsorn Suporn Boonprakub |
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| Institution: | (1) National Institute for Resources and Environment, 16-3 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan;(2) Present address: College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa, 252-8510, Japan);(3) Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Chikusa, Nagoya, Aichi, 464-8601, Japan;(4) Present address: Tokyo Institute of Technology, Midori, Yokohama, Kanagawa, 226-8502, Japan);(5) Center for Ecological Research, Kyoto University, 809-3 Otsuka, Kamitanakami-Hirano, Otsu, Shiga, 520-2113, Japan;(6) Present address: Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano, Tokyo, 164-8639, Japan) |
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| Abstract: | We studied the distribution of dissolved O2, CO2, CH4, and N2O in a coastal swamp system in Thailand with the goal to characterize the dynamics of these gases within the system. The gas concentrations varied spatially and seasonally in both surface and ground waters. The entire system was a strong sourcefor CO2 and CH4, and a possible sink for atmospheric N2O. Seasonal variation in precipitation primarily regulated the redox conditions in the system. However, distributions of CO2, CH4, and N2O in the river that received swamp waters were not always in agreement with redox conditions indicated by dissolvedO2 concentrations. Sulfate production through pyriteoxidation occurred in the swamp with thin peat layerunder aerobic conditions and was reflected by elevatedSO
4
2–
/Cl– in the river water. When SO
4
2–
/Cl– was high, CO2 and CH4 concentrations decreased, whereas the N2O concentration increased. The excess SO
4
2–
in the river water was thus identified as a potential indicator for gas dynamics in this coastal swamp system. |
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| Keywords: | carbon dioxide coastal peat swamp methane nitrous oxide oxygen pyrite oxidation redox condition |
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