Seasonal dynamics,typhoons and the regulation of lake metabolism in a subtropical humic lake |
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Authors: | JENG‐WEI TSAI TIMOTHY K KRATZ PAUL C HANSON JIUNN‐TZONG WU WILLIAM Y B CHANG PETER W ARZBERGER BING‐SHIH LIN FANG‐PANG LIN HSIU‐MEI CHOU CHIH‐YU CHIU |
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Institution: | 1. Research Center for Biodiversity, Academia Sinica, Taipei, Taiwan;2. Graduate Institute of Ecology and Evolutionary Biology, China Medical University, Taichung, Taiwan;3. Center for Limnology, University of Wisconsin – Madison, Madison, WI, U.S.A.;4. U.S. National Science Foundation Beijing Office, Dong San Huan Bei Lu, Chaoyang District, Beijing, China;5. University of California, San Diego, La Jolla, CA, U.S.A.;6. National Center for High‐Performance Computing, Hsinchu Science Park, Hsinchu, Taiwan |
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Abstract: | 1. We used high‐frequency in situ dissolved oxygen measurements to investigate the seasonal variability and factors regulating metabolism in a subtropical alpine lake in Taiwan between May 2004 and October 2005, specifically exploring how the typhoon season (from June or July to October) affects lake metabolism. 2. Gross primary production (GPP) and ecosystem respiration (R) both peaked in early summer and mid‐autumn but dropped during the typhoon season and winter. Yuan‐Yang Lake is a net heterotrophic ecosystem (annual mean net ecosystem production ?39.6 μmole O2 m?3). 3. Compared to the summer peaks, seasonal averages of GPP and R decreased by approximately 50% and 25%, respectively, during the typhoon season. Ecosystem respiration was more resistant to external disturbances than GPP and showed strong daily variation during typhoon seasons. 4. Changes in the quality and quantity of dissolved organic carbon controlled the temporal dynamics and metabolic regulation. External disturbances (typhoons) caused increased allochthony, increasing DOC and water colour and influencing lake metabolism. 5. Seasonal winter mixing and typhoon‐induced water mixing in summer and autumn play a key role in determining the extent to which the lake is a seasonal carbon sink or source to the atmosphere. |
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Keywords: | dissolved organic carbon high‐frequency measurements lake metabolism typhoon subtropical lake Yuan‐Yang Lake |
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