Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord
The Arctic Ocean is considered the most vulnerable ecosystem to ocean acidification, and large-scale assessments of pH and the saturation state for aragonite (Ωarag) have led to the notion that the Arctic Ocean is already close to a corrosive state. In high-latitude coastal waters the regulation of...
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Copernicus Publications
2015
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00015497 2023-05-15T14:55:21+02:00 Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord Krause-Jensen, D. Duarte, C. M. Hendriks, I. E. Meire, L. Blicher, M. E. Marbà, N. Sejr, M. K. 2015-08 electronic https://doi.org/10.5194/bg-12-4895-2015 https://noa.gwlb.de/receive/cop_mods_00015497 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00015452/bg-12-4895-2015.pdf https://bg.copernicus.org/articles/12/4895/2015/bg-12-4895-2015.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-12-4895-2015 https://noa.gwlb.de/receive/cop_mods_00015497 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00015452/bg-12-4895-2015.pdf https://bg.copernicus.org/articles/12/4895/2015/bg-12-4895-2015.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2015 ftnonlinearchiv https://doi.org/10.5194/bg-12-4895-2015 2022-02-08T22:54:34Z The Arctic Ocean is considered the most vulnerable ecosystem to ocean acidification, and large-scale assessments of pH and the saturation state for aragonite (Ωarag) have led to the notion that the Arctic Ocean is already close to a corrosive state. In high-latitude coastal waters the regulation of pH and Ωarag is, however, far more complex than offshore because increased biological activity and input of glacial meltwater affect pH. Effects of ocean acidification on calcifiers and non-calcifying phototrophs occupying coastal habitats cannot be derived from extrapolation of current and forecasted offshore conditions, but they require an understanding of the regimes of pH and Ωarag in their coastal habitats. To increase knowledge of the natural variability in pH in the Arctic coastal zone and specifically to test the influence of benthic vegetated habitats, we quantified pH variability in a Greenland fjord in a nested-scale approach. A sensor array logging pH, O2, PAR, temperature and salinity was applied on spatial scales ranging from kilometre scale across the horizontal extension of the fjord; to 100 m scale vertically in the fjord, 10–100 m scale between subtidal habitats with and without kelp forests and between vegetated tidal pools and adjacent vegetated shores; and to centimetre to metre scale within kelp forests and millimetre scale across diffusive boundary layers of macrophyte tissue. In addition, we assessed the temporal variability in pH on diurnal and seasonal scales. Based on pH measurements combined with point samples of total alkalinity, dissolved inorganic carbon and relationships to salinity, we also estimated variability in Ωarag. Results show variability in pH and Ωarag of up to 0.2–0.3 units at several scales, i.e. along the horizontal and vertical extension of the fjord, between seasons and on a diel basis in benthic habitats and within 1 m3 of kelp forest. Vegetated intertidal pools exhibited extreme diel pH variability of > 1.5 units and macrophyte diffusive boundary layers a pH range of up to 0.8 units. Overall, pelagic and benthic metabolism was an important driver of pH and Ωarag producing mosaics of variability from low levels in the dark to peak levels at high irradiance generally appearing favourable for calcification. We suggest that productive coastal environments may form niches of high pH in a future acidified Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Ocean Greenland Ocean acidification Subarctic Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Greenland Biogeosciences 12 16 4895 4911 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Krause-Jensen, D. Duarte, C. M. Hendriks, I. E. Meire, L. Blicher, M. E. Marbà, N. Sejr, M. K. Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
topic_facet |
article Verlagsveröffentlichung |
description |
The Arctic Ocean is considered the most vulnerable ecosystem to ocean acidification, and large-scale assessments of pH and the saturation state for aragonite (Ωarag) have led to the notion that the Arctic Ocean is already close to a corrosive state. In high-latitude coastal waters the regulation of pH and Ωarag is, however, far more complex than offshore because increased biological activity and input of glacial meltwater affect pH. Effects of ocean acidification on calcifiers and non-calcifying phototrophs occupying coastal habitats cannot be derived from extrapolation of current and forecasted offshore conditions, but they require an understanding of the regimes of pH and Ωarag in their coastal habitats. To increase knowledge of the natural variability in pH in the Arctic coastal zone and specifically to test the influence of benthic vegetated habitats, we quantified pH variability in a Greenland fjord in a nested-scale approach. A sensor array logging pH, O2, PAR, temperature and salinity was applied on spatial scales ranging from kilometre scale across the horizontal extension of the fjord; to 100 m scale vertically in the fjord, 10–100 m scale between subtidal habitats with and without kelp forests and between vegetated tidal pools and adjacent vegetated shores; and to centimetre to metre scale within kelp forests and millimetre scale across diffusive boundary layers of macrophyte tissue. In addition, we assessed the temporal variability in pH on diurnal and seasonal scales. Based on pH measurements combined with point samples of total alkalinity, dissolved inorganic carbon and relationships to salinity, we also estimated variability in Ωarag. Results show variability in pH and Ωarag of up to 0.2–0.3 units at several scales, i.e. along the horizontal and vertical extension of the fjord, between seasons and on a diel basis in benthic habitats and within 1 m3 of kelp forest. Vegetated intertidal pools exhibited extreme diel pH variability of > 1.5 units and macrophyte diffusive boundary layers a pH range of up to 0.8 units. Overall, pelagic and benthic metabolism was an important driver of pH and Ωarag producing mosaics of variability from low levels in the dark to peak levels at high irradiance generally appearing favourable for calcification. We suggest that productive coastal environments may form niches of high pH in a future acidified Arctic Ocean. |
format |
Article in Journal/Newspaper |
author |
Krause-Jensen, D. Duarte, C. M. Hendriks, I. E. Meire, L. Blicher, M. E. Marbà, N. Sejr, M. K. |
author_facet |
Krause-Jensen, D. Duarte, C. M. Hendriks, I. E. Meire, L. Blicher, M. E. Marbà, N. Sejr, M. K. |
author_sort |
Krause-Jensen, D. |
title |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_short |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_full |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_fullStr |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_full_unstemmed |
Macroalgae contribute to nested mosaics of pH variability in a subarctic fjord |
title_sort |
macroalgae contribute to nested mosaics of ph variability in a subarctic fjord |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/bg-12-4895-2015 https://noa.gwlb.de/receive/cop_mods_00015497 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00015452/bg-12-4895-2015.pdf https://bg.copernicus.org/articles/12/4895/2015/bg-12-4895-2015.pdf |
geographic |
Arctic Arctic Ocean Greenland |
geographic_facet |
Arctic Arctic Ocean Greenland |
genre |
Arctic Arctic Ocean Greenland Ocean acidification Subarctic |
genre_facet |
Arctic Arctic Ocean Greenland Ocean acidification Subarctic |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-12-4895-2015 https://noa.gwlb.de/receive/cop_mods_00015497 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00015452/bg-12-4895-2015.pdf https://bg.copernicus.org/articles/12/4895/2015/bg-12-4895-2015.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-12-4895-2015 |
container_title |
Biogeosciences |
container_volume |
12 |
container_issue |
16 |
container_start_page |
4895 |
op_container_end_page |
4911 |
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1766327146226122752 |