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Erik Jeppesen

Hydraulic connectivity and evaporation control the water quality and sources of chromophoric dissolved organic matter in Lake Bosten in arid northwest China

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  • Lei Zhou, Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm, Univ Chinese Acad Sci, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Sino Danish Ctr Educ & Res SDC
  • ,
  • Yongqiang Zhou, Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm
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  • Yang Hu, Univ Chinese Acad Sci, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Sino Danish Ctr Educ & Res SDC
  • ,
  • Jian Cai, Univ Chinese Acad Sci, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Sino Danish Ctr Educ & Res SDC
  • ,
  • Chengrong Bai, Univ Chinese Acad Sci, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Sino Danish Ctr Educ & Res SDC
  • ,
  • Keqiang Shao, Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm
  • ,
  • Guang Gao, Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm
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  • Yunlin Zhang, Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm
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  • Erik Jeppesen
  • Xiangming Tang, Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm

Lake Bosten is the largest oligosaline lake in arid northwestern China, and water from its tributaries and evaporation control the water balance of the lake. In this study, water quality and chromophoric dissolved organic matter (CDOM) absorption and fluorescence were investigated in different seasons to elucidate how hydraulic connectivity and evaporation may affect the water quality and variability of CDOM in the lake. Mean suspended solids and turbidity were significantly higher in the upstream tributaries than in the lake, the difference being notably more pronounced in the wet than in the dry season. A markedly higher mean first principal component (PC1) score, which was significantly positively related to protein-like components, and a considerably lower fluorescence peak integration ratio -I-C:I-T, indicative, of the terrestrial humic-like CDOM contribution percentage, were observed in the lake than in the upstream tributaries. Correspondingly, notably higher contribution percentages of terrestrial humiclike components were observed in the river mouth areas than in the remaining lake regions. Furthermore, significantly higher mean turbidity, and notably lower mean conductivity and salinity, were recorded in the southwestern Kaidu river mouth than. in the remaining lake regions in the wet season. Notably higher mean salinity is recorded in Lake Bosten than in upstream tributaries. Autochthonous protein-like associated amino-acids and also PC1 scores increased significantly with increasing salinity. We conclude that the dynamics of water quality and CDOM composition in remote arid Lake Bosten are strongly driven by evaporation and also the hydraulic connectivity between the upstream tributaries and the downstream lake. (C) 2017 Elsevier Ltd. All rights reserved.

Original languageEnglish
JournalChemosphere
Volume188
Pages (from-to)608-617
Number of pages10
ISSN0045-6535
DOIs
Publication statusPublished - Dec 2017

    Research areas

  • Lake Bosten, Water quality, Chromophoric dissolved organic matter (CDOM), Hydraulic connectivity, PARALLEL FACTOR-ANALYSIS, BACTERIAL COMMUNITY COMPOSITION, EMISSION MATRIX FLUORESCENCE, OLIGOSALINE LAKE, LAND-USE, MOLECULAR-WEIGHT, SURFACE-SEDIMENT, PARAFAC ANALYSIS, CLIMATE-CHANGE, SALT BALANCE

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