Reply on RC1 DOI Creative Commons

Bartholomé Duboc

Published: Dec. 21, 2024

Abstract. Recent studies investigating future warming scenarios have shown that the ocean oxygen content will continue to decrease over coming century due and changes in oceanic circulation. However, significant uncertainties remain regarding magnitude patterns of deoxygenation. Here, we simulate oxygenation with ACCESS ESM1.5 model during two past interglacials were warmer than preindustrial climate, Last Interglacial (Marine Isotope Stage (MIS) 5e, ~ 129–115 ka) MIS 9e (~ 336–321 ka). While orbital parameters similar 5e 9e, lower precession, higher eccentricity obliquity pre-industrial, greenhouse gas radiative forcing was highest 9e. We find global is overall less oxygenated simulations compared control run concentrations are more sensitive distribution incoming solar radiation differences concentrations. Large regions Mediterranean Sea hypoxic simulation, a lesser extent an intensification expansion African Monsoon, enhanced river run-off resulting freshening surface waters stratification. Upwelling zones off coast North America Africa weaker both run, leading primary productivity export production. Antarctic Bottom Water oxygenated, while Atlantic Deep Pacific Ocean at intermediate depths content. All primarily caused by circulation production secondarily temperature solubility.

Language: Английский

Dissolved oxygen affinities of hundreds of benthic foraminiferal species DOI
Martin Tetard, Joseph G. Prebble, Giuseppe Cortese

et al.

Marine Micropaleontology, Journal Year: 2024, Volume and Issue: 190, P. 102380 - 102380

Published: June 1, 2024

Language: Английский

Citations

4
Temporal, Morphological, and Taxonomic Frameworks for Calibrating Benthic Foraminiferal Pore Patterns as a Paleoxygenation Proxy DOI Creative Commons
Sebastián Garrido, Babette Hoogakker, Julien Richirt

et al.

Paleoceanography and Paleoclimatology, Journal Year: 2025, Volume and Issue: 40(5)

Published: April 28, 2025

Abstract Calcareous benthic foraminifera commonly develop pores in their test wall for gas exchange (e.g., O 2 , CO ) with seawater. Pore patterns, that is, porosity, pore density, and size, are influenced by environmental factors like bottom water dissolved oxygen concentration (BWDO). Certain species show increased porosity under low BWDO, making them a useful proxy reconstructing past BWDO. The patterns as BWDO validated the Southeast Pacific (SEP) examining six relation to estimated on sediment sites. Specimens were collected from surface sediments between 24 3,252 m depth across SEP (12°–44°S). selected based Rose Bengal staining, isotopes, calibrated radiocarbon age reflect modern conditions. Porosity, density size measured umbilical spiral sides of foraminifera, including all visible chambers, penultimate antepenultimate chambers (PAC). Pores side, facing column, used attachment, response changes uptake. In SEP, strongest correlations is found measurements side foraminiferal test, indicating this area most sensitive changes. Combined species, C. wuellerstorfi increase lower These findings align global calibrations, supporting quantitative use reconstruct an error range around ±60 μmol kg −1 above 100 ±20 than .

Language: Английский

Citations

0
Editorial: The marine iodine cycle, past, present and future DOI Creative Commons
Rosie Chance, Gregory A. Cutter, Dalton Hardisty

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: May 9, 2024

EDITORIAL article Front. Mar. Sci., 09 May 2024Sec. Marine Biogeochemistry Volume 11 - 2024 | https://doi.org/10.3389/fmars.2024.1417731

Language: Английский

Citations

0
Reply on RC2 DOI Creative Commons

Bartholomé Duboc

Published: Dec. 21, 2024

Abstract. Recent studies investigating future warming scenarios have shown that the ocean oxygen content will continue to decrease over coming century due and changes in oceanic circulation. However, significant uncertainties remain regarding magnitude patterns of deoxygenation. Here, we simulate oxygenation with ACCESS ESM1.5 model during two past interglacials were warmer than preindustrial climate, Last Interglacial (Marine Isotope Stage (MIS) 5e, ~ 129–115 ka) MIS 9e (~ 336–321 ka). While orbital parameters similar 5e 9e, lower precession, higher eccentricity obliquity pre-industrial, greenhouse gas radiative forcing was highest 9e. We find global is overall less oxygenated simulations compared control run concentrations are more sensitive distribution incoming solar radiation differences concentrations. Large regions Mediterranean Sea hypoxic simulation, a lesser extent an intensification expansion African Monsoon, enhanced river run-off resulting freshening surface waters stratification. Upwelling zones off coast North America Africa weaker both run, leading primary productivity export production. Antarctic Bottom Water oxygenated, while Atlantic Deep Pacific Ocean at intermediate depths content. All primarily caused by circulation production secondarily temperature solubility.

Language: Английский

Citations

0
Reply on RC3 DOI Creative Commons

Bartholomé Duboc

Published: Dec. 21, 2024

Abstract. Recent studies investigating future warming scenarios have shown that the ocean oxygen content will continue to decrease over coming century due and changes in oceanic circulation. However, significant uncertainties remain regarding magnitude patterns of deoxygenation. Here, we simulate oxygenation with ACCESS ESM1.5 model during two past interglacials were warmer than preindustrial climate, Last Interglacial (Marine Isotope Stage (MIS) 5e, ~ 129–115 ka) MIS 9e (~ 336–321 ka). While orbital parameters similar 5e 9e, lower precession, higher eccentricity obliquity pre-industrial, greenhouse gas radiative forcing was highest 9e. We find global is overall less oxygenated simulations compared control run concentrations are more sensitive distribution incoming solar radiation differences concentrations. Large regions Mediterranean Sea hypoxic simulation, a lesser extent an intensification expansion African Monsoon, enhanced river run-off resulting freshening surface waters stratification. Upwelling zones off coast North America Africa weaker both run, leading primary productivity export production. Antarctic Bottom Water oxygenated, while Atlantic Deep Pacific Ocean at intermediate depths content. All primarily caused by circulation production secondarily temperature solubility.

Language: Английский

Citations

0
Reply on RC1 DOI Creative Commons

Bartholomé Duboc

Published: Dec. 21, 2024

Abstract. Recent studies investigating future warming scenarios have shown that the ocean oxygen content will continue to decrease over coming century due and changes in oceanic circulation. However, significant uncertainties remain regarding magnitude patterns of deoxygenation. Here, we simulate oxygenation with ACCESS ESM1.5 model during two past interglacials were warmer than preindustrial climate, Last Interglacial (Marine Isotope Stage (MIS) 5e, ~ 129–115 ka) MIS 9e (~ 336–321 ka). While orbital parameters similar 5e 9e, lower precession, higher eccentricity obliquity pre-industrial, greenhouse gas radiative forcing was highest 9e. We find global is overall less oxygenated simulations compared control run concentrations are more sensitive distribution incoming solar radiation differences concentrations. Large regions Mediterranean Sea hypoxic simulation, a lesser extent an intensification expansion African Monsoon, enhanced river run-off resulting freshening surface waters stratification. Upwelling zones off coast North America Africa weaker both run, leading primary productivity export production. Antarctic Bottom Water oxygenated, while Atlantic Deep Pacific Ocean at intermediate depths content. All primarily caused by circulation production secondarily temperature solubility.

Language: Английский

Citations

0