The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends
Abstract Ocean deoxygenation is an emerging hazard for marine ecosystems and a fingerprint of anthropogenic change. Interior ocean oxygen concentrations respond to changes in ventilation that supply oxygen and the demand of biogeochemical processes that consume oxygen. A better understanding of thei...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-10-01
|
| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2021GL094797 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849687783321370624 |
|---|---|
| author | Pearse James Buchanan Alessandro Tagliabue |
| author_facet | Pearse James Buchanan Alessandro Tagliabue |
| author_sort | Pearse James Buchanan |
| collection | DOAJ |
| description | Abstract Ocean deoxygenation is an emerging hazard for marine ecosystems and a fingerprint of anthropogenic change. Interior ocean oxygen concentrations respond to changes in ventilation that supply oxygen and the demand of biogeochemical processes that consume oxygen. A better understanding of their regional importance would improve confidence in Earth System Model projections, which underpin ecosystem risk and vulnerability assessments. Using a hindcast reanalysis simulation, we find that oxygen trends between 1975 and 2014 in low‐oxygen zones along eastern margins are strongly affected by biogeochemical processes that alter oxygen demand, while oxygen‐rich regions of the open ocean are driven by ventilation changes. A similar regional distinction emerges among CMIP6 Earth System Models. Therefore, while biogeochemical functioning is an important source of uncertainty in low‐latitude, low‐oxygen regions, uncertainty in global trends is due to insufficient physical supply changes in Earth System Models, which is confirmed using repeat hydrographic section data in the southern mid‐latitudes. |
| format | Article |
| id | doaj-art-140c736a265b4bf0a8fb2278e9286d3f |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2021-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-140c736a265b4bf0a8fb2278e9286d3f2025-08-20T03:22:14ZengWileyGeophysical Research Letters0094-82761944-80072021-10-014820n/an/a10.1029/2021GL094797The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen TrendsPearse James Buchanan0Alessandro Tagliabue1Department of Earth, Ocean, and Ecological Sciences University of Liverpool Liverpool UKDepartment of Earth, Ocean, and Ecological Sciences University of Liverpool Liverpool UKAbstract Ocean deoxygenation is an emerging hazard for marine ecosystems and a fingerprint of anthropogenic change. Interior ocean oxygen concentrations respond to changes in ventilation that supply oxygen and the demand of biogeochemical processes that consume oxygen. A better understanding of their regional importance would improve confidence in Earth System Model projections, which underpin ecosystem risk and vulnerability assessments. Using a hindcast reanalysis simulation, we find that oxygen trends between 1975 and 2014 in low‐oxygen zones along eastern margins are strongly affected by biogeochemical processes that alter oxygen demand, while oxygen‐rich regions of the open ocean are driven by ventilation changes. A similar regional distinction emerges among CMIP6 Earth System Models. Therefore, while biogeochemical functioning is an important source of uncertainty in low‐latitude, low‐oxygen regions, uncertainty in global trends is due to insufficient physical supply changes in Earth System Models, which is confirmed using repeat hydrographic section data in the southern mid‐latitudes.https://doi.org/10.1029/2021GL094797ocean deoxygenationbiogeochemistryclimate changeglobal warmingmarine ecosystemmodeling |
| spellingShingle | Pearse James Buchanan Alessandro Tagliabue The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends Geophysical Research Letters ocean deoxygenation biogeochemistry climate change global warming marine ecosystem modeling |
| title | The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends |
| title_full | The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends |
| title_fullStr | The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends |
| title_full_unstemmed | The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends |
| title_short | The Regional Importance of Oxygen Demand and Supply for Historical Ocean Oxygen Trends |
| title_sort | regional importance of oxygen demand and supply for historical ocean oxygen trends |
| topic | ocean deoxygenation biogeochemistry climate change global warming marine ecosystem modeling |
| url | https://doi.org/10.1029/2021GL094797 |
| work_keys_str_mv | AT pearsejamesbuchanan theregionalimportanceofoxygendemandandsupplyforhistoricaloceanoxygentrends AT alessandrotagliabue theregionalimportanceofoxygendemandandsupplyforhistoricaloceanoxygentrends AT pearsejamesbuchanan regionalimportanceofoxygendemandandsupplyforhistoricaloceanoxygentrends AT alessandrotagliabue regionalimportanceofoxygendemandandsupplyforhistoricaloceanoxygentrends |