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dc.contributor.authorJurikova, Hana
dc.contributor.authorGuha, Tania
dc.contributor.authorAbe, Osamu
dc.contributor.authorShiah, Fuh-Kwo
dc.contributor.authorWang, Chung-Ho
dc.contributor.authorLiang, Mao-Chang
dc.date.accessioned2020-07-14T14:30:02Z
dc.date.available2020-07-14T14:30:02Z
dc.date.issued2016-12-22
dc.identifier.citationJurikova , H , Guha , T , Abe , O , Shiah , F-K , Wang , C-H & Liang , M-C 2016 , ' Variations in triple isotope composition of dissolved oxygen and primary production in a subtropical reservoir ' , Biogeosciences , vol. 13 , pp. 6683-6698 . https://doi.org/10.5194/bg-13-6683-2016en
dc.identifier.issn1726-4170
dc.identifier.otherPURE: 269138217
dc.identifier.otherPURE UUID: 19807c16-72c0-4b3b-af4e-91ced2d907f9
dc.identifier.otherScopus: 85007038222
dc.identifier.urihttp://hdl.handle.net/10023/20248
dc.descriptionThe work was supported in part by MOST grants 101-2628-M-001-001-MY4 and 105-2111-M-001-006-MY3 to Academia Sinica.en
dc.description.abstractLakes and reservoirs play an important role in the carbon cycle, and therefore monitoring their metabolic rates is essential. The triple oxygen-isotope anomaly of dissolved O2 [17Δ =  ln(1+δ17O) − 0.518  ×  ln(1 + δ18O)] offers a new, in situ, perspective on primary production, yet little is known about 17Δ from freshwater systems. We investigated the 17Δ together with the oxygen : argon ratio [Δ(O2 ∕ Ar)] in the subtropical Feitsui Reservoir in Taiwan from June 2014 to July 2015. Here, we present the seasonal variations in 17Δ, GP (gross production), NP (net production) and the NP ∕ GP (net to gross ratio) in association with environmental parameters. The 17Δ varied with depth and season, with values ranging between 26 and 205 per meg. The GP rates were observed to be higher (702 ± 107 mg C m−2 d−1) in winter than those (303 ± 66 mg C m−2 d−1) recorded during the summer. The overall averaged GP was 220 g C m−2 yr−1 and NP was −3 g C m−2 yr−1, implying the reservoir was net heterotrophic on an annual basis. This is due to negative NP rates from October to February (−198 ± 78 mg C m−2 d−1). Comparisons between GP rates obtained from the isotope mass balance approach and 14C bottle incubation method (14C–GP) showed consistent values on the same order of magnitude with a GP ∕ 14C–GP ratio of 1.2 ± 1.1. Finally we noted that, although typhoon occurrences were scarce, higher than average 17Δ values and GP rates were recorded after typhoon events.
dc.language.isoeng
dc.relation.ispartofBiogeosciencesen
dc.rightsCopyright © Author(s) 2016. This work is distributed under the Creative Commons Attribution 3.0 License.en
dc.subjectGE Environmental Sciencesen
dc.subjectDASen
dc.subject.lccGEen
dc.titleVariations in triple isotope composition of dissolved oxygen and primary production in a subtropical reservoiren
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.identifier.doihttps://doi.org/10.5194/bg-13-6683-2016
dc.description.statusPeer revieweden


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