Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
doi: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
Review status
This discussion paper is under review for the journal Biogeosciences (BG).
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 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 (< 1.0 mg L−1), is ranked in the lowest 1 % among the world rivers. However, mean DOC yield (~ 30 kg ha−1 y−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.

Citation: Lee, T.-Y., Lee, L.-C., Huang, J.-C., Jien, S.-H., Hein, T., Zehetner, F., Kao, S.-J., and Shiah, F.-K.: The dynamics and export of dissolved organic carbon from subtropical small mountainous rivers during typhoon and non-typhoon periods, Biogeosciences Discuss., doi:10.5194/bg-2017-105, in review, 2017.
Tsung-Yu Lee et al.
Tsung-Yu Lee et al.
Tsung-Yu Lee et al.

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