| Title: | "Hydrological Controls on Dissolved Organic Matter Composition throughout the Aquatic Continuum of the Watershed of Selin Co, the Largest Lake on the Tibetan Plateau" |
| Author(s): | Zhou L; Zhou Y; Zhang Y; Wu Y; Jang KS; Spencer RGM; Brookes JD; Jeppesen E; |
| Address: | "State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. Bio-Chemical Analysis Team, Korea Basic Science Institute, Cheongju 28119, South Korea. Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, United States. Water Research Centre, School of Biological Science, The University of Adelaide, 5005 Adelaide, Australia. Department of Bioscience and Center for Water Technology (WATEC), Aarhus University, Vejlsovej 25, DK-8600 Silkeborg, Denmark. Sino-Danish Centre for Education and Research, Beijing 100190, China. Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara 06800, Turkey. Institute of Marine Sciences, Middle East Technical University, Mersin 33731, Turkey" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Alpine river and lake systems on the Tibetan Plateau are highly sensitive indicators and amplifiers of global climate change and important components of the carbon cycle. Dissolved organic matter (DOM) encompasses organic carbon in aquatic systems, yet knowledge about DOM variation throughout the river-lake aquatic continuum within alpine regions is limited. We used optical spectroscopy, ultrahigh-resolution mass spectrometry (Fourier transform ion cyclotron resonance mass spectrometry), and stable water isotopic measurements to evaluate linkages between DOM composition and hydrological connection. We investigated glacial influences on DOM composition throughout the watershed of Selin Co, including upstream glacier-fed rivers and downstream-linked lakes. We found that the dissolved organic carbon concentration increased, whereas specific ultraviolet absorbance (SUVA(254)) decreased along the river-lake continuum. Relative to rivers, the downstream lakes had low relative abundances of polyphenolic and condensed aromatic compounds and humic-like substances but increased relative abundances of aliphatics and protein-like compounds. SUVA(254) decreased while protein-like components increased with enriched stable water isotope delta(2)H-H(2)O, indicating that DOM aromaticity declined while autochthonous production increased along the flow paths. Glacier meltwater contributed to elevated relative abundances of aliphatic and protein-like compounds in headwater streams, while increased relative abundances of aromatics and humic-like DOM were found in glacier-fed lakes than downstream lakes. We conclude that changes in hydrological conditions, including glacier melt driven by a warming climate, will significantly alter DOM composition and potentially their biogeochemical function in surface waters on the Tibetan Plateau" |
| Keywords: | "*Hydrology *Dissolved Organic Matter/analysis *Lakes/analysis/chemistry Tibet Water Movements Rivers Freezing Mass Spectrometry Hydrogen Oxygen Isotopes Volatilization FT-ICR MS, stable water isotopes alpine lakes dissolved organic matter (DOM);" |
| Notes: | "MedlineZhou, Lei Zhou, Yongqiang Zhang, Yunlin Wu, Yonghong Jang, Kyoung-Soon Spencer, Robert G M Brookes, Justin D Jeppesen, Erik eng Research Support, Non-U.S. Gov't 2023/03/10 Environ Sci Technol. 2023 Mar 21; 57(11):4668-4678. doi: 10.1021/acs.est.2c08257. Epub 2023 Mar 9" |
