Changes in Water Chemistry Associated with Rainstorm Events Increase Carbon Emissions from the Inflowing River Mouth of a Major Drinking Water Reservoir

Li Y., Zhou Y., Zhou L., Zhang Y., Xu H., Jang K., ...Daha Fazla

Environmental Science and Technology, cilt.56, sa.22, ss.16494-16505, 2022 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 56 Sayı: 22
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1021/acs.est.2c06405
  • Dergi Adı: Environmental Science and Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, ABI/INFORM, Applied Science & Technology Source, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, BIOSIS, Biotechnology Research Abstracts, Business Source Elite, Business Source Premier, CAB Abstracts, Chemical Abstracts Core, Chimica, Compendex, Computer & Applied Sciences, EMBASE, Environment Index, Food Science & Technology Abstracts, Geobase, Greenfile, MEDLINE, Pollution Abstracts, Public Affairs Index, Veterinary Science Database, DIALNET
  • Sayfa Sayıları: ss.16494-16505
  • Anahtar Kelimeler: dissolved organic matter (DOM), CH4, reservoir, FT-ICR MS, CO2, DISSOLVED ORGANIC-MATTER, INORGANIC CARBON, FLUORESCENCE, LAKES, METHANE, DIOXIDE, DEGRADATION, VARIABILITY, QUALITY
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

© 2022 American Chemical Society. All rights reserved.Large reservoirs are hotspots for carbon emissions, and the continued input and decomposition of terrestrial dissolved organic matter (DOM) from upstream catchments is an important source of carbon emissions. Rainstorm events can cause a surge in DOM input; however, periodic sampling often fails to fully capture the impact of these discrete rainstorm events on carbon emissions. We conducted a set of frequent observations prior to and following a rainstorm event in a major reservoir Lake Qiandao (China; 580 km2) from June to July 2021 to investigate how rainstorms alter water chemistry and CO2and CH4emissions. We found that the mean CO2efflux (FCO2) (13.2 ± 9.3 mmol m-2d-1) and CH4efflux (FCH4) (0.12 ± 0.02 mmol m-2d-1) in the postrainstorm campaign were significantly higher than those in the prerainstorm campaign (-3.8 ± 3.0 and +0.06 ± 0.02 mmol m-2d-1, respectively). FCO2and FCH4increased with increasing nitrogen and phosphorus levels, elevated DOM absorption (a350), specific UV absorbance SUVA254, and terrestrial humic-like fluorescence. Furthermore, FCO2and FCH4decreased with increasing chlorophyll-a (Chl-a), dissolved oxygen (DO), and pH. A five-day laboratory anoxic bioincubation experiment further revealed a depletion of terrestrial-DOM concurrent with increased CO2and CH4production. We conclude that rainstorms boost the emission of CO2and CH4fueled by the surge and decomposition of fresh terrestrially derived biolabile DOM in this and likely many other reservoir's major inflowing river mouths.