Controls on buffering and coastal acidification in a temperate estuary
Estuaries may be uniquely susceptible to the combined acidification pressures of atmospherically driven ocean acidification (OA), biologically driven CO2 inputs from the estuary itself, and terrestrially derived freshwater inputs. This study utilized continuous measurements of total alkalinity (TA)...
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ftuninhampshire:oai:scholars.unh.edu:faculty_pubs-2416 2023-05-15T17:51:37+02:00 Controls on buffering and coastal acidification in a temperate estuary Hunt, Christopher W. Salisbury, Joseph Vandemark, Douglas 2022-04-15T07:00:00Z application/pdf https://scholars.unh.edu/faculty_pubs/1410 https://scholars.unh.edu/cgi/viewcontent.cgi?article=2416&context=faculty_pubs unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/faculty_pubs/1410 https://scholars.unh.edu/cgi/viewcontent.cgi?article=2416&context=faculty_pubs http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Faculty Publications estuary coastal ocean buffering alkalinity pCO2 mixing biogeochemistry Oceanography text 2022 ftuninhampshire 2023-01-30T22:39:36Z Estuaries may be uniquely susceptible to the combined acidification pressures of atmospherically driven ocean acidification (OA), biologically driven CO2 inputs from the estuary itself, and terrestrially derived freshwater inputs. This study utilized continuous measurements of total alkalinity (TA) and the partial pressure of carbon dioxide (pCO2) from the mouth of Great Bay, a temperate northeastern U.S. estuary, to examine the potential influences of endmember mixing and biogeochemical transformation upon estuary buffering capacity (β–H). Observations were collected hourly over 28 months representing all seasons between May 2016 and December 2019. Results indicated that endmember mixing explained most of the observed variability in TA and dissolved inorganic carbon (DIC), concentrations of which varied strongly with season. For much of the year, mixing dictated the relative proportions of salinity-normalized TA and DIC as well, but a fall season shift in these proportions indicated that aerobic respiration was observed, which would decrease β–H by decreasing TA and increasing DIC. However, fall was also the season of weakest statistical correspondence between salinity and both TA and DIC, as well as the overall highest salinity, TA and β–H. Potential biogeochemically driven β–H decreases were overshadowed by increased buffering capacity supplied by coastal ocean water. A simple modeling exercise showed that mixing processes controlled most monthly changes in TA and DIC, obscuring impacts from air–sea exchange or metabolic processes. Advective mixing contributions may be as important as biogeochemically driven changes to observe when evaluating local estuarine and coastal OA. Text Ocean acidification University of New Hampshire: Scholars Repository |
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University of New Hampshire: Scholars Repository |
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estuary coastal ocean buffering alkalinity pCO2 mixing biogeochemistry Oceanography |
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estuary coastal ocean buffering alkalinity pCO2 mixing biogeochemistry Oceanography Hunt, Christopher W. Salisbury, Joseph Vandemark, Douglas Controls on buffering and coastal acidification in a temperate estuary |
topic_facet |
estuary coastal ocean buffering alkalinity pCO2 mixing biogeochemistry Oceanography |
description |
Estuaries may be uniquely susceptible to the combined acidification pressures of atmospherically driven ocean acidification (OA), biologically driven CO2 inputs from the estuary itself, and terrestrially derived freshwater inputs. This study utilized continuous measurements of total alkalinity (TA) and the partial pressure of carbon dioxide (pCO2) from the mouth of Great Bay, a temperate northeastern U.S. estuary, to examine the potential influences of endmember mixing and biogeochemical transformation upon estuary buffering capacity (β–H). Observations were collected hourly over 28 months representing all seasons between May 2016 and December 2019. Results indicated that endmember mixing explained most of the observed variability in TA and dissolved inorganic carbon (DIC), concentrations of which varied strongly with season. For much of the year, mixing dictated the relative proportions of salinity-normalized TA and DIC as well, but a fall season shift in these proportions indicated that aerobic respiration was observed, which would decrease β–H by decreasing TA and increasing DIC. However, fall was also the season of weakest statistical correspondence between salinity and both TA and DIC, as well as the overall highest salinity, TA and β–H. Potential biogeochemically driven β–H decreases were overshadowed by increased buffering capacity supplied by coastal ocean water. A simple modeling exercise showed that mixing processes controlled most monthly changes in TA and DIC, obscuring impacts from air–sea exchange or metabolic processes. Advective mixing contributions may be as important as biogeochemically driven changes to observe when evaluating local estuarine and coastal OA. |
format |
Text |
author |
Hunt, Christopher W. Salisbury, Joseph Vandemark, Douglas |
author_facet |
Hunt, Christopher W. Salisbury, Joseph Vandemark, Douglas |
author_sort |
Hunt, Christopher W. |
title |
Controls on buffering and coastal acidification in a temperate estuary |
title_short |
Controls on buffering and coastal acidification in a temperate estuary |
title_full |
Controls on buffering and coastal acidification in a temperate estuary |
title_fullStr |
Controls on buffering and coastal acidification in a temperate estuary |
title_full_unstemmed |
Controls on buffering and coastal acidification in a temperate estuary |
title_sort |
controls on buffering and coastal acidification in a temperate estuary |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2022 |
url |
https://scholars.unh.edu/faculty_pubs/1410 https://scholars.unh.edu/cgi/viewcontent.cgi?article=2416&context=faculty_pubs |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Faculty Publications |
op_relation |
https://scholars.unh.edu/faculty_pubs/1410 https://scholars.unh.edu/cgi/viewcontent.cgi?article=2416&context=faculty_pubs |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766158830605959168 |