Articles | Volume 16, issue 13
https://doi.org/10.5194/bg-16-2733-2019
https://doi.org/10.5194/bg-16-2733-2019
Research article
 | 
12 Jul 2019
Research article |  | 12 Jul 2019

Composition and cycling of dissolved organic matter from tropical peatlands of coastal Sarawak, Borneo, revealed by fluorescence spectroscopy and parallel factor analysis

Yongli Zhou, Patrick Martin, and Moritz Müller

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Cited articles

Aarnos, H., Ylöstalo, P., and Vähätalo, A. V.: Seasonal phototransformation of dissolved organic matter to ammonium, dissolved inorganic carbon, and labile substrates supporting bacterial biomass across the Baltic Sea, J. Geophys. Res.-Biogeo., 117, 1–14, https://doi.org/10.1029/2010JG001633, 2012. 
Aarnos, H., Gélinas, Y., Kasurinen, V., Gu, Y., Puupponen, V. M., and Vähätalo, A. V.: Photochemical Mineralization of Terrigenous DOC to Dissolved Inorganic Carbon in Ocean, Global Biogeochem. Cy., 32, 250–266, https://doi.org/10.1002/2017GB005698, 2018. 
Alkhatib, M., Jennerjahn, T. C., and Samiaji, J.: Biogeochemistry of the Dumai River estuary, Sumatra, Indonesia, a tropical blackwater river, Limnol. Oceanogr., 52, 2410–2417, https://doi.org/10.4319/lo.2007.52.6.2410, 2007. 
Alling, V., Porcelli, D., Mörth, C.-M., Anderson, L. G., Sanchez-Garcia, L., Gustafsson, Ö., Andersson, P. S., and Humborg, C.: Degradation of terrestrial organic carbon, primary production and out-gassing of CO2 in the Laptev and East Siberian Seas as inferred from δ13C values of DIC, Geochim. Cosmochim. Ac., 95, 143–159, https://doi.org/10.1016/j.gca.2012.07.028, 2012. 
Baum, A., Rixen, T., and Samiaji, J.: Relevance of peat draining rivers in central Sumatra for the riverine input of dissolved organic carbon into the ocean, Estuar. Coast. Shelf Sci., 73, 563–570, https://doi.org/10.1016/j.ecss.2007.02.012, 2007. 
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We found that peatlands in coastal Sarawak, Borneo, export extremely humified organic matter, which dominates the riverine organic matter pool and conservatively mixes with seawater, while the freshly produced fraction is low and stable in concentration at all salinities. We estimated that terrigenous fractions, which showed high photolability, still account for 20 % of the coastal dissolved organic carbon pool, implying the importance of peat-derived organic matter in the coastal carbon cycle.
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