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

Environmental Science & Technology
Yongqiang ZhouErik Jeppesen

Abstract

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 δ2H, and δ18O 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, δ2H, and δ18O. The central lake samples showed a major contribution of terrestrial-sourced molecular formulas to the ultrahigh resolution mass spectrometry data, suggesting the presence of allochthon...Continue Reading

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Citations

Aug 9, 2019·Environmental Science and Pollution Research International·Biao LiQinglong L Wu
Nov 21, 2020·The Science of the Total Environment·Lei ZhangZhaode Wang
Nov 29, 2020·The Science of the Total Environment·Yunlin ZhangWeining Zhu
Jan 18, 2021·The Science of the Total Environment·Lei ZhangJicheng Zhong
Mar 19, 2021·Water Research·Maciej BartosiewiczIsabelle Laurion
Apr 16, 2021·Environmental Science and Pollution Research International·Lifei WangJian Liu
Jun 13, 2021·Environmental Science and Pollution Research International·Haoyu RenYinghao Zhang
Dec 27, 2021·The Science of the Total Environment·Clarisse C BlanchetPetri Nummi

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