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https://doi.org/10.5194/bg-2017-105
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-2017-105
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 05 Apr 2017

Research article | 05 Apr 2017

Review status
This discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The revised manuscript was not accepted.

The dynamics and export of dissolved organic carbon from subtropical small mountainous rivers during typhoon and non-typhoon periods

Tsung-Yu Lee1, Li-Chin Lee2, Jr-Chuan Huang2, Shih-Hao Jien3, Thomas Hein4,8, Franz Zehetner5, Shuh-Ji Kao6, and Fuh-Kwo Shiah7 Tsung-Yu Lee et al.
  • 1Department of Geography, National Taiwan Normal University, Taipei, Taiwan
  • 2Department of Geography, National Taiwan University, Taipei, Taiwan
  • 3Department of Soil and Water Conservation, National Pingtung University of Science and Technology, Pingtung, Taiwan
  • 4Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, Vienna, Austria
  • 5Institute of Soil Research, University of Natural Resources and Life Sciences, Vienna, Austria
  • 6State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China
  • 7Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
  • 8WasserCluster Lunz, Dr. Kupelwieser-Prom. 5, 3293 Lunz am See, Austria

Abstract. Small mountainous rivers (SMRs) are important conveyors of the land-to-ocean organic carbon export. However, relatively few studies have focused on dissolved organic carbon (DOC) compared to particulate organic carbon. In a long-term project (2002 to 2014), stream DOC was monitored in three neighboring subtropical small mountainous rivers of Taiwan. The objective was to relate DOC concentrations to water discharge and to quantify DOC flux during typhoon and non-typhoon periods. Seasonal fluctuations of DOC concentrations were closely correlated with air temperature at all sampling stations. During non-typhoon periods, increasing water discharge led to decreasing DOC concentrations due to a dilution effect. However, during typhoon periods, DOC concentrations increased with some lead time along the hydrograph and reached the annual maximum which likely sources from a significant input of litter and upper soil layers. The mean DOC concentration of the studied systems (<1.0mgL−1), is ranked in the lowest 1% among the world rivers. However, mean DOC yield (~30kgha−1y−1), is ranked in the top 30%, which is attributed to high rainfall and substantial organic carbon stocks in the watersheds. Up to 25±5.6% of the annual DOC flux was contributed by typhoon events, which occupied ~3% of the monitoring period. We conclude that typhoon events are important drivers for the land-to-ocean export of dissolved organic matter. Predicted future increases in frequency and magnitude of typhoon events will likely accelerate the release of terrestrial carbon and enhance its land-to-ocean transfer via dissolved organic matter.

Tsung-Yu Lee et al.
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Tsung-Yu Lee et al.
Tsung-Yu Lee et al.
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