Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems
Coastal pH and total alkalinity are regulated by a diverse range of local processes superimposed on global trends of warming and ocean acidification, yet few studies have investigated the relative importance of different processes for coastal acidification. We describe long-term (1972-2016) and seas...
Published in: | Global Biogeochemical Cycles |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/298264 2024-01-07T09:45:42+01:00 Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems Carstensen, Jacob Chierici, Melissa Gustafsson, Bo G. Gustafsson, Erik Tvärminne Zoological Station Marine Ecosystems Research Group 2019-01-23T22:42:27Z 17 application/pdf http://hdl.handle.net/10138/298264 eng eng Wiley/Blackwell 10.1002/2017GB005781 We are grateful to the regional environmental research centers under the Danish Nature Agency for collecting and providing DNAMAP data used in this study (available at www.miljoeportal.dk). This study is a contribution of the TRIACID project funded by the Nordic Council of Ministers (grant 170019) and BONUS COCOA project (grant agreement 2112932-1) funded by the Danish Research Council and the European Commission. B. G. and E. G. were further supported by the Swedish Agency for Marine and Water Management through their grant 1:11-Measures for marine and water environment. Carstensen , J , Chierici , M , Gustafsson , B G & Gustafsson , E 2018 , ' Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems ' , Global Biogeochemical Cycles , vol. 32 , no. 3 , pp. 497-513 . https://doi.org/10.1002/2017GB005781 85044296091 9eb8f4bb-7946-42c3-99e7-e0e8d9440bff http://hdl.handle.net/10138/298264 000430105900010 openAccess info:eu-repo/semantics/openAccess acidification eutrophication global warming alkalinity estuarine mixing OCEAN ACIDIFICATION BALTIC SEA BIOGEOCHEMICAL PROCESSES DANISH ESTUARIES TOTAL ALKALINITY CHESAPEAKE BAY SEAWATER WATERS PH 1172 Environmental sciences Article publishedVersion 2019 ftunivhelsihelda 2023-12-14T00:02:23Z Coastal pH and total alkalinity are regulated by a diverse range of local processes superimposed on global trends of warming and ocean acidification, yet few studies have investigated the relative importance of different processes for coastal acidification. We describe long-term (1972-2016) and seasonal trends in the carbonate system of three Danish coastal systems demonstrating that hydrological modification, changes in nutrient inputs from land, and presence/absence of calcifiers can drastically alter carbonate chemistry. Total alkalinity was mainly governed by conservative mixing of freshwater (0.73-5.17mmolkg(-1)) with outer boundary concentrations (similar to 2-2.4mmolkg(-1)), modulated seasonally and spatially (similar to 0.1-0.2mmolkg(-1)) by calcifiers. Nitrate assimilation by primary production, denitrification, and sulfate reduction increased total alkalinity by almost 0.6mmolkg(-1) in the most eutrophic system during a period without calcifiers. Trends in pH ranged from -0.0088year(-1) to 0.021year(-1), the more extreme of these mainly driven by salinity changes in a sluice-controlled lagoon. Temperature increased 0.05 degrees Cyr(-1) across all three systems, which directly accounted for a pH decrease of 0.0008year(-1). Accounting for mixing, salinity, and temperature effects on dissociation and solubility constants, the resulting pH decline (0.0040year(-1)) was about twice the ocean trend, emphasizing the effect of nutrient management on primary production and coastal acidification. Coastal pCO(2) increased similar to 4 times more rapidly than ocean rates, enhancing CO2 emissions to the atmosphere. Indeed, coastal systems undergo more drastic changes than the ocean and coastal acidification trends are substantially enhanced from nutrient reductions to address coastal eutrophication. Peer reviewed Article in Journal/Newspaper Ocean acidification HELDA – University of Helsinki Open Repository Global Biogeochemical Cycles 32 3 497 513 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
acidification eutrophication global warming alkalinity estuarine mixing OCEAN ACIDIFICATION BALTIC SEA BIOGEOCHEMICAL PROCESSES DANISH ESTUARIES TOTAL ALKALINITY CHESAPEAKE BAY SEAWATER WATERS PH 1172 Environmental sciences |
spellingShingle |
acidification eutrophication global warming alkalinity estuarine mixing OCEAN ACIDIFICATION BALTIC SEA BIOGEOCHEMICAL PROCESSES DANISH ESTUARIES TOTAL ALKALINITY CHESAPEAKE BAY SEAWATER WATERS PH 1172 Environmental sciences Carstensen, Jacob Chierici, Melissa Gustafsson, Bo G. Gustafsson, Erik Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems |
topic_facet |
acidification eutrophication global warming alkalinity estuarine mixing OCEAN ACIDIFICATION BALTIC SEA BIOGEOCHEMICAL PROCESSES DANISH ESTUARIES TOTAL ALKALINITY CHESAPEAKE BAY SEAWATER WATERS PH 1172 Environmental sciences |
description |
Coastal pH and total alkalinity are regulated by a diverse range of local processes superimposed on global trends of warming and ocean acidification, yet few studies have investigated the relative importance of different processes for coastal acidification. We describe long-term (1972-2016) and seasonal trends in the carbonate system of three Danish coastal systems demonstrating that hydrological modification, changes in nutrient inputs from land, and presence/absence of calcifiers can drastically alter carbonate chemistry. Total alkalinity was mainly governed by conservative mixing of freshwater (0.73-5.17mmolkg(-1)) with outer boundary concentrations (similar to 2-2.4mmolkg(-1)), modulated seasonally and spatially (similar to 0.1-0.2mmolkg(-1)) by calcifiers. Nitrate assimilation by primary production, denitrification, and sulfate reduction increased total alkalinity by almost 0.6mmolkg(-1) in the most eutrophic system during a period without calcifiers. Trends in pH ranged from -0.0088year(-1) to 0.021year(-1), the more extreme of these mainly driven by salinity changes in a sluice-controlled lagoon. Temperature increased 0.05 degrees Cyr(-1) across all three systems, which directly accounted for a pH decrease of 0.0008year(-1). Accounting for mixing, salinity, and temperature effects on dissociation and solubility constants, the resulting pH decline (0.0040year(-1)) was about twice the ocean trend, emphasizing the effect of nutrient management on primary production and coastal acidification. Coastal pCO(2) increased similar to 4 times more rapidly than ocean rates, enhancing CO2 emissions to the atmosphere. Indeed, coastal systems undergo more drastic changes than the ocean and coastal acidification trends are substantially enhanced from nutrient reductions to address coastal eutrophication. Peer reviewed |
author2 |
Tvärminne Zoological Station Marine Ecosystems Research Group |
format |
Article in Journal/Newspaper |
author |
Carstensen, Jacob Chierici, Melissa Gustafsson, Bo G. Gustafsson, Erik |
author_facet |
Carstensen, Jacob Chierici, Melissa Gustafsson, Bo G. Gustafsson, Erik |
author_sort |
Carstensen, Jacob |
title |
Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems |
title_short |
Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems |
title_full |
Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems |
title_fullStr |
Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems |
title_full_unstemmed |
Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems |
title_sort |
long-term and seasonal trends in estuarine and coastal carbonate systems |
publisher |
Wiley/Blackwell |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/298264 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
10.1002/2017GB005781 We are grateful to the regional environmental research centers under the Danish Nature Agency for collecting and providing DNAMAP data used in this study (available at www.miljoeportal.dk). This study is a contribution of the TRIACID project funded by the Nordic Council of Ministers (grant 170019) and BONUS COCOA project (grant agreement 2112932-1) funded by the Danish Research Council and the European Commission. B. G. and E. G. were further supported by the Swedish Agency for Marine and Water Management through their grant 1:11-Measures for marine and water environment. Carstensen , J , Chierici , M , Gustafsson , B G & Gustafsson , E 2018 , ' Long-Term and Seasonal Trends in Estuarine and Coastal Carbonate Systems ' , Global Biogeochemical Cycles , vol. 32 , no. 3 , pp. 497-513 . https://doi.org/10.1002/2017GB005781 85044296091 9eb8f4bb-7946-42c3-99e7-e0e8d9440bff http://hdl.handle.net/10138/298264 000430105900010 |
op_rights |
openAccess info:eu-repo/semantics/openAccess |
container_title |
Global Biogeochemical Cycles |
container_volume |
32 |
container_issue |
3 |
container_start_page |
497 |
op_container_end_page |
513 |
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1787427289400606720 |