Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination

Research output: Contribution to journal › Letter › Research › peer-review

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Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination. / Lambert, Fabrice; Opazo, Natalia; Ridgwell, Andy; Winckler, Gisela; Lamy, Frank; Shaffer, Gary; Kohfeld, Karen; Ohgaito, Rumi; Albani, Samuel; Abe-Ouchi, Ayako.

In: Earth and Planetary Science Letters, Vol. 554, 116675, 15.01.2021.

Research output: Contribution to journal › Letter › Research › peer-review

Harvard

Lambert, F, Opazo, N, Ridgwell, A, Winckler, G, Lamy, F, Shaffer, G, Kohfeld, K, Ohgaito, R, Albani, S & Abe-Ouchi, A 2021, 'Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination', Earth and Planetary Science Letters, vol. 554, 116675. https://doi.org/10.1016/j.epsl.2020.116675

APA

Lambert, F., Opazo, N., Ridgwell, A., Winckler, G., Lamy, F., Shaffer, G., Kohfeld, K., Ohgaito, R., Albani, S., & Abe-Ouchi, A. (2021). Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination. Earth and Planetary Science Letters, 554, [116675]. https://doi.org/10.1016/j.epsl.2020.116675

Vancouver

Lambert F, Opazo N, Ridgwell A, Winckler G, Lamy F, Shaffer G et al. Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination. Earth and Planetary Science Letters. 2021 Jan 15;554. 116675. https://doi.org/10.1016/j.epsl.2020.116675

Author

Lambert, Fabrice ; Opazo, Natalia ; Ridgwell, Andy ; Winckler, Gisela ; Lamy, Frank ; Shaffer, Gary ; Kohfeld, Karen ; Ohgaito, Rumi ; Albani, Samuel ; Abe-Ouchi, Ayako. / Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination. In: Earth and Planetary Science Letters. 2021 ; Vol. 554.

Bibtex

@article{c1d7afb8be8d4b1f80dbbd18a3e43667,
title = "Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination",
abstract = "The last time Earth's climate experienced geologically rapid global warming was associated with the last glacial termination, when atmospheric CO2 concentrations rose from 180 ppmv during the Last Glacial Maximum (LGM, 26-19 kaBP) to similar to 260 ppmv by the early Holocene (12-8 kaBP). About one quarter of that difference is thought to be due to a stronger biological pump during glacial times, driven by increased aeolian dust deposition and hence greater iron availability in ocean surface waters. However, dust supply did not change uniformly or in synchrony over the deglacial transition and what is not known is the relative importance of different oceanic regions and how this may have changed in time. Using an Earth system model of intermediate complexity, we quantify the sensitivity of atmospheric CO2 to regional changes in iron supply, and test six different global dust reconstructions in order to explore uncertainty in past dust changes. We confirm the Southern Ocean (>34 degrees S) as the region most sensitive to iron fertilization, with the Atlantic and Pacific sectors accounting for about 41 +/- 23% and 16 +/- 10%, respectively, of the total CO2 reduction from global iron fertilization. However, the North Pacific contributes 28 +/- 3% to the total implying an important role for Northern Hemisphere processes in driving deglacial CO2 rise. In addition, our analysis reveals an unexpected regional-temporal disparity, and while Southern Hemisphere iron fertilization influences atmospheric CO2 relatively constantly throughout the termination the impact of the Northern Hemisphere only occurs during the later stages of the termination. (C) 2020 The Author(s). Published by Elsevier B.V.",
keywords = "CO2, dust, iron fertilization, paleoclimate, termination, SOUTHERN-OCEAN, DUST DEPOSITION, ATMOSPHERIC CO2, NORTH PACIFIC, TEMPERATURE, MAXIMUM, FLUXES, TRANSPORT, AEROSOLS, MODEL",
author = "Fabrice Lambert and Natalia Opazo and Andy Ridgwell and Gisela Winckler and Frank Lamy and Gary Shaffer and Karen Kohfeld and Rumi Ohgaito and Samuel Albani and Ayako Abe-Ouchi",
year = "2021",
month = jan,
day = "15",
doi = "10.1016/j.epsl.2020.116675",
language = "English",
volume = "554",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination

AU - Lambert, Fabrice

AU - Opazo, Natalia

AU - Ridgwell, Andy

AU - Winckler, Gisela

AU - Lamy, Frank

AU - Shaffer, Gary

AU - Kohfeld, Karen

AU - Ohgaito, Rumi

AU - Albani, Samuel

AU - Abe-Ouchi, Ayako

PY - 2021/1/15

Y1 - 2021/1/15

N2 - The last time Earth's climate experienced geologically rapid global warming was associated with the last glacial termination, when atmospheric CO2 concentrations rose from 180 ppmv during the Last Glacial Maximum (LGM, 26-19 kaBP) to similar to 260 ppmv by the early Holocene (12-8 kaBP). About one quarter of that difference is thought to be due to a stronger biological pump during glacial times, driven by increased aeolian dust deposition and hence greater iron availability in ocean surface waters. However, dust supply did not change uniformly or in synchrony over the deglacial transition and what is not known is the relative importance of different oceanic regions and how this may have changed in time. Using an Earth system model of intermediate complexity, we quantify the sensitivity of atmospheric CO2 to regional changes in iron supply, and test six different global dust reconstructions in order to explore uncertainty in past dust changes. We confirm the Southern Ocean (>34 degrees S) as the region most sensitive to iron fertilization, with the Atlantic and Pacific sectors accounting for about 41 +/- 23% and 16 +/- 10%, respectively, of the total CO2 reduction from global iron fertilization. However, the North Pacific contributes 28 +/- 3% to the total implying an important role for Northern Hemisphere processes in driving deglacial CO2 rise. In addition, our analysis reveals an unexpected regional-temporal disparity, and while Southern Hemisphere iron fertilization influences atmospheric CO2 relatively constantly throughout the termination the impact of the Northern Hemisphere only occurs during the later stages of the termination. (C) 2020 The Author(s). Published by Elsevier B.V.

AB - The last time Earth's climate experienced geologically rapid global warming was associated with the last glacial termination, when atmospheric CO2 concentrations rose from 180 ppmv during the Last Glacial Maximum (LGM, 26-19 kaBP) to similar to 260 ppmv by the early Holocene (12-8 kaBP). About one quarter of that difference is thought to be due to a stronger biological pump during glacial times, driven by increased aeolian dust deposition and hence greater iron availability in ocean surface waters. However, dust supply did not change uniformly or in synchrony over the deglacial transition and what is not known is the relative importance of different oceanic regions and how this may have changed in time. Using an Earth system model of intermediate complexity, we quantify the sensitivity of atmospheric CO2 to regional changes in iron supply, and test six different global dust reconstructions in order to explore uncertainty in past dust changes. We confirm the Southern Ocean (>34 degrees S) as the region most sensitive to iron fertilization, with the Atlantic and Pacific sectors accounting for about 41 +/- 23% and 16 +/- 10%, respectively, of the total CO2 reduction from global iron fertilization. However, the North Pacific contributes 28 +/- 3% to the total implying an important role for Northern Hemisphere processes in driving deglacial CO2 rise. In addition, our analysis reveals an unexpected regional-temporal disparity, and while Southern Hemisphere iron fertilization influences atmospheric CO2 relatively constantly throughout the termination the impact of the Northern Hemisphere only occurs during the later stages of the termination. (C) 2020 The Author(s). Published by Elsevier B.V.

KW - CO2

KW - dust

KW - iron fertilization

KW - paleoclimate

KW - termination

KW - SOUTHERN-OCEAN

KW - DUST DEPOSITION

KW - ATMOSPHERIC CO2

KW - NORTH PACIFIC

KW - TEMPERATURE

KW - MAXIMUM

KW - FLUXES

KW - TRANSPORT

KW - AEROSOLS

KW - MODEL

U2 - 10.1016/j.epsl.2020.116675

DO - 10.1016/j.epsl.2020.116675

M3 - Letter

VL - 554

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

M1 - 116675

ER -

ID: 256625724