Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes
To investigate the factors affecting water quality in coastal regions with sea dike constructions, surface water outside a sea dike was monitored for six years from 2015 to 2020 in the Saemangeum region of Korea. Statistical analyses of the six years of high-frequency measurements revealed that the...
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ftmdpi:oai:mdpi.com:/2077-1312/11/6/1247/ 2023-08-20T04:09:00+02:00 Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes Yong-Woo Lee Yong Hwa Oh Sang Heon Lee Dohyun Kim DongJoo Joung agris 2023-06-19 application/pdf https://doi.org/10.3390/jmse11061247 EN eng Multidisciplinary Digital Publishing Institute Chemical Oceanography https://dx.doi.org/10.3390/jmse11061247 https://creativecommons.org/licenses/by/4.0/ Journal of Marine Science and Engineering; Volume 11; Issue 6; Pages: 1247 water quality sea dike hypoxia pH apparent oxygen utilization Republic of Korea Text 2023 ftmdpi https://doi.org/10.3390/jmse11061247 2023-08-01T10:32:06Z To investigate the factors affecting water quality in coastal regions with sea dike constructions, surface water outside a sea dike was monitored for six years from 2015 to 2020 in the Saemangeum region of Korea. Statistical analyses of the six years of high-frequency measurements revealed that the water quality in this system was predominantly governed by natural processes followed by pollutant inputs as the secondary influencing factor. Severe dissolved oxygen (DO) depletion was observed in the surface waters during warm periods, probably owing to the advection of DO-depleted water from elsewhere to the surface layer. Based on the apparent oxygen utilization (AOU)–pH relationship (r = 0.52, n = 1837), the maximum AOU (180 µM) led to a pH decrease from 8.04 to 7.50, which was considerably lower than the estimated value of 7.72. This extra pH drop was probably due to a reduction in the buffering capacity associated with increased CO2 in the water column originating from the atmosphere and in situ production, as well as local water column redox reactions associated with benthic inputs of reduced chemical species. Overall, persistent DO depletion with ongoing eutrophication/hypoxia could accelerate ocean acidification in Korean coastal waters, which could be more acute in coastal regions with artificial coastal constructions. Text Ocean acidification MDPI Open Access Publishing Journal of Marine Science and Engineering 11 6 1247 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
water quality sea dike hypoxia pH apparent oxygen utilization Republic of Korea |
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water quality sea dike hypoxia pH apparent oxygen utilization Republic of Korea Yong-Woo Lee Yong Hwa Oh Sang Heon Lee Dohyun Kim DongJoo Joung Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes |
topic_facet |
water quality sea dike hypoxia pH apparent oxygen utilization Republic of Korea |
description |
To investigate the factors affecting water quality in coastal regions with sea dike constructions, surface water outside a sea dike was monitored for six years from 2015 to 2020 in the Saemangeum region of Korea. Statistical analyses of the six years of high-frequency measurements revealed that the water quality in this system was predominantly governed by natural processes followed by pollutant inputs as the secondary influencing factor. Severe dissolved oxygen (DO) depletion was observed in the surface waters during warm periods, probably owing to the advection of DO-depleted water from elsewhere to the surface layer. Based on the apparent oxygen utilization (AOU)–pH relationship (r = 0.52, n = 1837), the maximum AOU (180 µM) led to a pH decrease from 8.04 to 7.50, which was considerably lower than the estimated value of 7.72. This extra pH drop was probably due to a reduction in the buffering capacity associated with increased CO2 in the water column originating from the atmosphere and in situ production, as well as local water column redox reactions associated with benthic inputs of reduced chemical species. Overall, persistent DO depletion with ongoing eutrophication/hypoxia could accelerate ocean acidification in Korean coastal waters, which could be more acute in coastal regions with artificial coastal constructions. |
format |
Text |
author |
Yong-Woo Lee Yong Hwa Oh Sang Heon Lee Dohyun Kim DongJoo Joung |
author_facet |
Yong-Woo Lee Yong Hwa Oh Sang Heon Lee Dohyun Kim DongJoo Joung |
author_sort |
Yong-Woo Lee |
title |
Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes |
title_short |
Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes |
title_full |
Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes |
title_fullStr |
Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes |
title_full_unstemmed |
Assessment of Water Quality in a Coastal Region of Sea Dike Construction in Korea and the Impact of Low Dissolved Oxygen Concentrations on pH Changes |
title_sort |
assessment of water quality in a coastal region of sea dike construction in korea and the impact of low dissolved oxygen concentrations on ph changes |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2023 |
url |
https://doi.org/10.3390/jmse11061247 |
op_coverage |
agris |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Journal of Marine Science and Engineering; Volume 11; Issue 6; Pages: 1247 |
op_relation |
Chemical Oceanography https://dx.doi.org/10.3390/jmse11061247 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/jmse11061247 |
container_title |
Journal of Marine Science and Engineering |
container_volume |
11 |
container_issue |
6 |
container_start_page |
1247 |
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1774721641948905472 |