Enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought event
An active debate has been underway on the magnitude and duration of carbon (C) emissions from hydroelectric reservoirs, yet little attention has been paid to stochastic C emissions from reservoir sediments during extreme climatic events. A rare opportunity for field measurements of CO _2 efflux from...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2016-01-01
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| Series: | Environmental Research Letters |
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| Online Access: | https://doi.org/10.1088/1748-9326/11/12/124003 |
| _version_ | 1797748655208267776 |
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| author | Hyojin Jin Tae Kyung Yoon Seung-Hoon Lee Hojeong Kang Jungho Im Ji-Hyung Park |
| author_facet | Hyojin Jin Tae Kyung Yoon Seung-Hoon Lee Hojeong Kang Jungho Im Ji-Hyung Park |
| author_sort | Hyojin Jin |
| collection | DOAJ |
| description | An active debate has been underway on the magnitude and duration of carbon (C) emissions from hydroelectric reservoirs, yet little attention has been paid to stochastic C emissions from reservoir sediments during extreme climatic events. A rare opportunity for field measurements of CO _2 efflux from a hydroelectric reservoir in Korea during an extreme drought event was used to examine how prolonged droughts can affect microbial organic matter processing and the release of CO _2 , CH _4 and N _2 O from exposed sediments. Chamber measurements of CO _2 efflux along an exposed sediment transect, combined with high-frequency continuous sensor measurements of the partial pressure of CO _2 (pCO _2 ) in the reservoir surface water, exhibited extraordinary pulses of CO _2 from exposed sediments and the turbulent inflowing water in contrast to a small CO _2 sink in the main water body of the reservoir and a low efflux of CO _2 from the flooded sediment. Significant increases in the production of CO _2 , CH _4 and N _2 O observed in a laboratory incubation of sediments, together with enhanced activities of phenol oxidase and three hydrolases, indicate a temporary activation of microbial organic matter processing in the drying sediment. The results suggest that drought-triggered pulses of greenhouse gas emission from exposed sediments can offset the C accumulation in reservoir sediments over time scales of years to decades, reversing the trend of declining C emissions from aging reservoirs. |
| first_indexed | 2024-03-12T16:08:52Z |
| format | Article |
| id | doaj.art-c1802739be7f4deaa4a0d45559eaf771 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T16:08:52Z |
| publishDate | 2016-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-c1802739be7f4deaa4a0d45559eaf7712023-08-09T14:15:32ZengIOP PublishingEnvironmental Research Letters1748-93262016-01-01111212400310.1088/1748-9326/11/12/124003Enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought eventHyojin Jin0Tae Kyung Yoon1https://orcid.org/0000-0003-0627-0135Seung-Hoon Lee2Hojeong Kang3Jungho Im4Ji-Hyung Park5Department of Environmental Science and Engineering, Ewha Womans University , Seoul 120-750, KoreaDepartment of Environmental Science and Engineering, Ewha Womans University , Seoul 120-750, KoreaSchool of Civil and Environmental Engineering, Yonsei University , Seoul 120-749, KoreaSchool of Civil and Environmental Engineering, Yonsei University , Seoul 120-749, KoreaSchool of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, KoreaDepartment of Environmental Science and Engineering, Ewha Womans University , Seoul 120-750, KoreaAn active debate has been underway on the magnitude and duration of carbon (C) emissions from hydroelectric reservoirs, yet little attention has been paid to stochastic C emissions from reservoir sediments during extreme climatic events. A rare opportunity for field measurements of CO _2 efflux from a hydroelectric reservoir in Korea during an extreme drought event was used to examine how prolonged droughts can affect microbial organic matter processing and the release of CO _2 , CH _4 and N _2 O from exposed sediments. Chamber measurements of CO _2 efflux along an exposed sediment transect, combined with high-frequency continuous sensor measurements of the partial pressure of CO _2 (pCO _2 ) in the reservoir surface water, exhibited extraordinary pulses of CO _2 from exposed sediments and the turbulent inflowing water in contrast to a small CO _2 sink in the main water body of the reservoir and a low efflux of CO _2 from the flooded sediment. Significant increases in the production of CO _2 , CH _4 and N _2 O observed in a laboratory incubation of sediments, together with enhanced activities of phenol oxidase and three hydrolases, indicate a temporary activation of microbial organic matter processing in the drying sediment. The results suggest that drought-triggered pulses of greenhouse gas emission from exposed sediments can offset the C accumulation in reservoir sediments over time scales of years to decades, reversing the trend of declining C emissions from aging reservoirs.https://doi.org/10.1088/1748-9326/11/12/124003hydroelectric reservoirgreenhouse gas emissionsedimentcarbon dioxideextreme eventdrought |
| spellingShingle | Hyojin Jin Tae Kyung Yoon Seung-Hoon Lee Hojeong Kang Jungho Im Ji-Hyung Park Enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought event Environmental Research Letters hydroelectric reservoir greenhouse gas emission sediment carbon dioxide extreme event drought |
| title | Enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought event |
| title_full | Enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought event |
| title_fullStr | Enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought event |
| title_full_unstemmed | Enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought event |
| title_short | Enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought event |
| title_sort | enhanced greenhouse gas emission from exposed sediments along a hydroelectric reservoir during an extreme drought event |
| topic | hydroelectric reservoir greenhouse gas emission sediment carbon dioxide extreme event drought |
| url | https://doi.org/10.1088/1748-9326/11/12/124003 |
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