Understanding the Implications of Hydrographic Processes on the Dynamics of the Carbonate System in a Sub-Antarctic Marine-Terminating Glacier-Fjord (53°S)
The biogeochemical dynamics of fjords in the southeastern Pacific Ocean are strongly influenced by hydrological and oceanographic processes occurring at a seasonal scale. In this study, we describe the role of hydrographic forcing on the seasonal variability of the carbonate system of the Sub-Antarc...
Published in: | Frontiers in Marine Science |
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Language: | English |
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Frontiers Media S.A.
2022
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Online Access: | https://doi.org/10.3389/fmars.2022.643811 https://doaj.org/article/dd151349f8294bf9a2f5b84ae62994a7 |
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ftdoajarticles:oai:doaj.org/article:dd151349f8294bf9a2f5b84ae62994a7 2023-05-15T13:45:10+02:00 Understanding the Implications of Hydrographic Processes on the Dynamics of the Carbonate System in a Sub-Antarctic Marine-Terminating Glacier-Fjord (53°S) Jurleys P. Vellojin Gonzalo S. Saldías Susan E. Allen Rodrigo Torres Maximiliano Vergara-Jara Marcus Sobarzo Michael D. DeGrandpre José Luis Iriarte 2022-06-01T00:00:00Z https://doi.org/10.3389/fmars.2022.643811 https://doaj.org/article/dd151349f8294bf9a2f5b84ae62994a7 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2022.643811/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.643811 https://doaj.org/article/dd151349f8294bf9a2f5b84ae62994a7 Frontiers in Marine Science, Vol 9 (2022) Patagonian fjord glacial freshwater water column stratification Sub-Antarctic fjords carbonate system phytoplankton blooms Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2022 ftdoajarticles https://doi.org/10.3389/fmars.2022.643811 2022-12-30T23:05:10Z The biogeochemical dynamics of fjords in the southeastern Pacific Ocean are strongly influenced by hydrological and oceanographic processes occurring at a seasonal scale. In this study, we describe the role of hydrographic forcing on the seasonal variability of the carbonate system of the Sub-Antarctic glacial fjord, Seno Ballena, in the Strait of Magellan (53°S). Biogeochemical variables were measured in 2018 during three seasonal hydrographic cruises (fall, winter and spring) and from a high-frequency pCO2-pH mooring for 10 months at 10 ± 1 m depth in the fjord. The hydrographic data showed that freshwater input from the glacier influenced the adjacent surface layer of the fjord and forced the development of undersaturated CO2 (< 400 μatm) and low aragonite saturation state (ΩAr < 1) water. During spring, the surface water had relatively low pCO2 (mean = 365, range: 167 - 471 μatm), high pH (mean = 8.1 on the total proton concentration scale, range: 8.0 - 8.3), and high ΩAr (mean = 1.6, range: 1.3 - 4.0). Concurrent measurements of phytoplankton biomass and nutrient conditions during spring indicated that the periods of lower pCO2 values corresponded to higher phytoplankton photosynthesis rates, resulting from autochthonous nutrient input and vertical mixing. In contrast, higher values of pCO2 (range: 365 – 433 μatm) and relatively lower values of pHT (range: 8.0 – 8.1) and ΩAr (range: 0.9 – 2.0) were recorded in cold surface waters during winter and fall. The naturally low freshwater carbonate ion concentrations diluted the carbonate ion concentrations in seawater and decreased the calcium carbonate saturation of the fjord. In spring, at 10 m depth, higher primary productivity caused a relative increase in ΩAr and pHT. Assuming global climate change will bring further glacier retreat and ocean acidification, this study represents important advances in our understanding of glacier meltwater processes on CO2 dynamics in glacier–fjord systems. Article in Journal/Newspaper Antarc* Antarctic Ocean acidification Directory of Open Access Journals: DOAJ Articles Antarctic Pacific Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Patagonian fjord glacial freshwater water column stratification Sub-Antarctic fjords carbonate system phytoplankton blooms Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Patagonian fjord glacial freshwater water column stratification Sub-Antarctic fjords carbonate system phytoplankton blooms Science Q General. Including nature conservation geographical distribution QH1-199.5 Jurleys P. Vellojin Gonzalo S. Saldías Susan E. Allen Rodrigo Torres Maximiliano Vergara-Jara Marcus Sobarzo Michael D. DeGrandpre José Luis Iriarte Understanding the Implications of Hydrographic Processes on the Dynamics of the Carbonate System in a Sub-Antarctic Marine-Terminating Glacier-Fjord (53°S) |
topic_facet |
Patagonian fjord glacial freshwater water column stratification Sub-Antarctic fjords carbonate system phytoplankton blooms Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The biogeochemical dynamics of fjords in the southeastern Pacific Ocean are strongly influenced by hydrological and oceanographic processes occurring at a seasonal scale. In this study, we describe the role of hydrographic forcing on the seasonal variability of the carbonate system of the Sub-Antarctic glacial fjord, Seno Ballena, in the Strait of Magellan (53°S). Biogeochemical variables were measured in 2018 during three seasonal hydrographic cruises (fall, winter and spring) and from a high-frequency pCO2-pH mooring for 10 months at 10 ± 1 m depth in the fjord. The hydrographic data showed that freshwater input from the glacier influenced the adjacent surface layer of the fjord and forced the development of undersaturated CO2 (< 400 μatm) and low aragonite saturation state (ΩAr < 1) water. During spring, the surface water had relatively low pCO2 (mean = 365, range: 167 - 471 μatm), high pH (mean = 8.1 on the total proton concentration scale, range: 8.0 - 8.3), and high ΩAr (mean = 1.6, range: 1.3 - 4.0). Concurrent measurements of phytoplankton biomass and nutrient conditions during spring indicated that the periods of lower pCO2 values corresponded to higher phytoplankton photosynthesis rates, resulting from autochthonous nutrient input and vertical mixing. In contrast, higher values of pCO2 (range: 365 – 433 μatm) and relatively lower values of pHT (range: 8.0 – 8.1) and ΩAr (range: 0.9 – 2.0) were recorded in cold surface waters during winter and fall. The naturally low freshwater carbonate ion concentrations diluted the carbonate ion concentrations in seawater and decreased the calcium carbonate saturation of the fjord. In spring, at 10 m depth, higher primary productivity caused a relative increase in ΩAr and pHT. Assuming global climate change will bring further glacier retreat and ocean acidification, this study represents important advances in our understanding of glacier meltwater processes on CO2 dynamics in glacier–fjord systems. |
format |
Article in Journal/Newspaper |
author |
Jurleys P. Vellojin Gonzalo S. Saldías Susan E. Allen Rodrigo Torres Maximiliano Vergara-Jara Marcus Sobarzo Michael D. DeGrandpre José Luis Iriarte |
author_facet |
Jurleys P. Vellojin Gonzalo S. Saldías Susan E. Allen Rodrigo Torres Maximiliano Vergara-Jara Marcus Sobarzo Michael D. DeGrandpre José Luis Iriarte |
author_sort |
Jurleys P. Vellojin |
title |
Understanding the Implications of Hydrographic Processes on the Dynamics of the Carbonate System in a Sub-Antarctic Marine-Terminating Glacier-Fjord (53°S) |
title_short |
Understanding the Implications of Hydrographic Processes on the Dynamics of the Carbonate System in a Sub-Antarctic Marine-Terminating Glacier-Fjord (53°S) |
title_full |
Understanding the Implications of Hydrographic Processes on the Dynamics of the Carbonate System in a Sub-Antarctic Marine-Terminating Glacier-Fjord (53°S) |
title_fullStr |
Understanding the Implications of Hydrographic Processes on the Dynamics of the Carbonate System in a Sub-Antarctic Marine-Terminating Glacier-Fjord (53°S) |
title_full_unstemmed |
Understanding the Implications of Hydrographic Processes on the Dynamics of the Carbonate System in a Sub-Antarctic Marine-Terminating Glacier-Fjord (53°S) |
title_sort |
understanding the implications of hydrographic processes on the dynamics of the carbonate system in a sub-antarctic marine-terminating glacier-fjord (53°s) |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.643811 https://doaj.org/article/dd151349f8294bf9a2f5b84ae62994a7 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic Ocean acidification |
genre_facet |
Antarc* Antarctic Ocean acidification |
op_source |
Frontiers in Marine Science, Vol 9 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2022.643811/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.643811 https://doaj.org/article/dd151349f8294bf9a2f5b84ae62994a7 |
op_doi |
https://doi.org/10.3389/fmars.2022.643811 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1766213944160026624 |