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Tytuł:
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Varying thermal structure controls the dynamics of CO 2 emissions from a subtropical reservoir, south China.
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Autorzy:
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Pu J; Key Laboratory of Karst Dynamics, MNR & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, China. Electronic address: .
Li J; Key Laboratory of Karst Dynamics, MNR & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, China.
Zhang T; Key Laboratory of Karst Dynamics, MNR & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, China.
Martin JB; Department of Geological Sciences, University of Florida, Gainesville, FL, 32611, USA.
Yuan D; Key Laboratory of Karst Dynamics, MNR & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, China.
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Źródło:
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Water research [Water Res] 2020 Jul 01; Vol. 178, pp. 115831. Date of Electronic Publication: 2020 Apr 17.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Oxford, Pergamon Press.
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MeSH Terms:
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Carbon Dioxide*
Groundwater*
China ; Environmental Monitoring ; Lakes ; Seasons
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Contributed Indexing:
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Keywords: CO(2) emission; China; Groundwater-fed reservoir; Mixing period; Thermal stratification
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Substance Nomenclature:
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142M471B3J (Carbon Dioxide)
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Entry Date(s):
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Date Created: 20200426 Date Completed: 20200525 Latest Revision: 20200525
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Update Code:
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20240105
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DOI:
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10.1016/j.watres.2020.115831
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PMID:
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32334180
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Thermal stratification and mixing are important to the physicochemical composition of reservoirs and lakes and impact their water quality and biogeochemical cycles. However, it remains unclear how thermal stratification and mixing process control the exchange of CO 2 between surface water and the Earth's atmosphere. To address this issue, we examine the temporal characteristics of some physicochemical parameters, partial pressure of CO 2 (pCO 2 ), the δ 13 C DIC , and CO 2 emission from a typical karst groundwater-fed reservoir (Dalongdong reservoir). During the 23 month study (2016-2018) thermal stratification limited CO 2 emission, in part from photosynthetic uptake of CO 2 , from early April to late October, while mixing processes stimulated CO 2 emission of CO 2 generated from organic matter remineralization in bottom water from October to April. The Dalongdong reservoir is an atmospheric source of CO 2 for most of the study period; however, during periods of stratification, approximately 0.37 ± 0.44 Gg CO 2 (1 Gg = 10 9 g) dissolved into the water from the atmosphere, while approximately 6.24 ± 3.73 Gg CO 2 was lost to the atmosphere during periods lacking stratification. Limited emissions during stratified period may thus represent a negative feedback to CO 2 contributions to global warming, which has increased lengths of stratified periods. These study results are important to optimize sampling monitoring strategies to reduce errors of regional CO 2 emission estimation.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
