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Erik Jeppesen

Accumulation of Terrestrial Dissolved Organic Matter Potentially Enhances Dissolved Methane Levels in Eutrophic Lake Taihu, China

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DOI

  • Yongqiang Zhou, Sino Danish Ctr Educ & Res SDC
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  • Qitao Xiao, Chinese Acad Sci, Nanjing Institute of Geography & Limnology, CAS, Chinese Academy of Sciences, State Key Lab Lake Sci & Environm, Nanjing Inst Geog & Limnol
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  • Xiaolong Yao, Univ Chinese Acad Sci, University of Chinese Academy of Sciences, CAS, Chinese Academy of Sciences, Coll Resources & Environm
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  • Yunlin Zhang, Univ Chinese Acad Sci, University of Chinese Academy of Sciences, CAS, Chinese Academy of Sciences, Coll Resources & Environm
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  • Mi Zhang, Nanjing Univ Informat Sci & Technol, Nanjing University of Information Science & Technology, Int Joint Lab Climate & Environm Change ILCEC, Yale NUIST Ctr Atmospher Environm
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  • Kun Shi, Univ Chinese Acad Sci, University of Chinese Academy of Sciences, CAS, Chinese Academy of Sciences, Coll Resources & Environm
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  • Xuhui Lee, Nanjing Univ Informat Sci & Technol, Nanjing University of Information Science & Technology, Int Joint Lab Climate & Environm Change ILCEC, Yale NUIST Ctr Atmospher Environm
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  • David C. Podgorski, Univ New Orleans, University of New Orleans, University of Louisiana System, Dept Chem, Pontchartrain Inst Environm Sci
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  • Boqiang Qin, Univ Chinese Acad Sci, University of Chinese Academy of Sciences, CAS, Chinese Academy of Sciences, Coll Resources & Environm
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  • Robert G. M. Spencer, Florida State Univ, Florida State University, Florida State University System, Dept Earth Ocean & Atmospher Sci
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  • Erik Jeppesen

Inland waters play an important role for the storage of chromophoric dissolved organic matter (CDOM) and outgassing of methane (CH4). However, to date, linkages between the optical dynamics of CDOM and dissolved CH4 levels remain largely unknown. We used multi-year (2012-2014) seasonal data series collected from Lake Taihu and 51 connecting channels to investigate how CDOM optical dynamics may impact dissolved CH4 levels in the lake. High dissolved CH4 in the northwestern inflowing river mouths coincided with high underwater UV-vis light availability, dissolved organic carbon (DOC), chemical oxygen demand (COD), DOM aromaticity, terrestrial humic-rich fluorescence, in situ measured terrestrial CDOM, depleted dissolved oxygen (DO), stable isotopic delta H-2, and delta O-18 compared with other lake regions. Our results further revealed positive relationships between dissolved CH4 and CDOM absorption at 350 nm, i.e. a(350), COD, DOC, terrestrial humic-rich fluorophores, and DOM aromaticity, and negative relationships between dissolved CH4 and DO, delta H-2, and delta O-18. The central lake samples showed a major contribution of terrestrial-sourced molecular formulas to the ultrahigh resolution mass spectrometry data, suggesting the presence of allochthonous DOM sources even here. We conclude that an elevated terrestrial CDOM input likely enhances dissolved CH4 levels in Lake Taihu.

Original languageEnglish
JournalEnvironmental Science & Technology
Volume52
Issue18
Pages (from-to)10297-10306
Number of pages10
ISSN0013-936X
DOIs
Publication statusPublished - 18 Sep 2018

    Research areas

  • PARALLEL FACTOR-ANALYSIS, LARGE SHALLOW LAKE, FLUORESCENCE SPECTROSCOPY, WATER COLUMN, PARAFAC ANALYSIS, TIBETAN PLATEAU, CARBON, ECOSYSTEMS, CLIMATE, QUALITY

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