Coupled evolution of temperature and carbonate chemistry during the Paleocene-Eocene; new trace element records from the low latitude Indian Ocean

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Coupled evolution of temperature and carbonate chemistry during the Paleocene-Eocene; new trace element records from the low latitude Indian Ocean. / Barnet, James; Littler, Kate; Harper, Dustin; LeVay, Leah J; Edgar, Kirsty; Henehan, Michael; Babila, Tali L.; Ullmann, Clemens; Leng, Melanie J.; Kroon, Dick ; Zachos, James.

In: Earth and Planetary Science Letters, Vol. 545, 116414, 01.09.2020.

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Barnet, J., Littler, K., Harper, D., LeVay, L. J., Edgar, K., Henehan, M., Babila, T. L., Ullmann, C., Leng, M. J., Kroon, D., & Zachos, J. (2020). Coupled evolution of temperature and carbonate chemistry during the Paleocene-Eocene; new trace element records from the low latitude Indian Ocean. Earth and Planetary Science Letters, 545, [116414]. https://doi.org/10.1016/j.epsl.2020.116414

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Author

Barnet, James ; Littler, Kate ; Harper, Dustin ; LeVay, Leah J ; Edgar, Kirsty ; Henehan, Michael ; Babila, Tali L. ; Ullmann, Clemens ; Leng, Melanie J. ; Kroon, Dick ; Zachos, James. / Coupled evolution of temperature and carbonate chemistry during the Paleocene-Eocene; new trace element records from the low latitude Indian Ocean. In: Earth and Planetary Science Letters. 2020 ; Vol. 545.

Bibtex

@article{2663b34c09d9469bb1d5f740d0d40c7b,
title = "Coupled evolution of temperature and carbonate chemistry during the Paleocene-Eocene; new trace element records from the low latitude Indian Ocean",
abstract = "The early Paleogene represents the most recent interval in Earth's history characterized by global greenhouse warmth on multi-million year timescales, yet our understanding of long-term climate and carbon cycle evolution in the low latitudes, and in particular the Indian Ocean, remains very poorly constrained. Here we present the first long-term sub-eccentricity-resolution stable isotope (δ 13C and δ 18O) and trace element (Mg/Ca and B/Ca) records spanning the late Paleocene–early Eocene (∼58–53 Ma) across a surface–deep hydrographic reconstruction of the northern Indian Ocean, resolving late Paleocene 405-kyr paced cyclicity and a portion of the PETM recovery. Our new records reveal a long-term warming of ∼4–5 °C at all depths in the water column, with absolute surface ocean temperatures and magnitudes of warming comparable to the low latitude Pacific. As a result of warming, we observe a long-term increase in δ 18O sw of the mixed layer, implying an increase in net evaporation. We also observe a collapse in the temperature gradient between mixed layer- and thermocline-dwelling species from ∼57–54 Ma, potentially due to either the development of a more homogeneous water column with a thicker mixed layer, or depth migration of the Morozovella in response to warming. Synchronous warming at both low and high latitudes, along with decreasing B/Ca ratios in planktic foraminifera indicating a decrease in ocean pH and/or increasing dissolved inorganic carbon, suggest that global climate was forced by rising atmospheric CO 2 concentrations during this time. ",
keywords = "Indian Ocean, Paleocene-Eocene Thermal Maximum, Paleogene, paleoceanography, paleoclimate, trace elements",
author = "James Barnet and Kate Littler and Dustin Harper and LeVay, {Leah J} and Kirsty Edgar and Michael Henehan and Babila, {Tali L.} and Clemens Ullmann and Leng, {Melanie J.} and Dick Kroon and James Zachos",
year = "2020",
month = sep,
day = "1",
doi = "10.1016/j.epsl.2020.116414",
language = "English",
volume = "545",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Coupled evolution of temperature and carbonate chemistry during the Paleocene-Eocene; new trace element records from the low latitude Indian Ocean

AU - Barnet, James

AU - Littler, Kate

AU - Harper, Dustin

AU - LeVay, Leah J

AU - Edgar, Kirsty

AU - Henehan, Michael

AU - Babila, Tali L.

AU - Ullmann, Clemens

AU - Leng, Melanie J.

AU - Kroon, Dick

AU - Zachos, James

PY - 2020/9/1

Y1 - 2020/9/1

N2 - The early Paleogene represents the most recent interval in Earth's history characterized by global greenhouse warmth on multi-million year timescales, yet our understanding of long-term climate and carbon cycle evolution in the low latitudes, and in particular the Indian Ocean, remains very poorly constrained. Here we present the first long-term sub-eccentricity-resolution stable isotope (δ 13C and δ 18O) and trace element (Mg/Ca and B/Ca) records spanning the late Paleocene–early Eocene (∼58–53 Ma) across a surface–deep hydrographic reconstruction of the northern Indian Ocean, resolving late Paleocene 405-kyr paced cyclicity and a portion of the PETM recovery. Our new records reveal a long-term warming of ∼4–5 °C at all depths in the water column, with absolute surface ocean temperatures and magnitudes of warming comparable to the low latitude Pacific. As a result of warming, we observe a long-term increase in δ 18O sw of the mixed layer, implying an increase in net evaporation. We also observe a collapse in the temperature gradient between mixed layer- and thermocline-dwelling species from ∼57–54 Ma, potentially due to either the development of a more homogeneous water column with a thicker mixed layer, or depth migration of the Morozovella in response to warming. Synchronous warming at both low and high latitudes, along with decreasing B/Ca ratios in planktic foraminifera indicating a decrease in ocean pH and/or increasing dissolved inorganic carbon, suggest that global climate was forced by rising atmospheric CO 2 concentrations during this time.

AB - The early Paleogene represents the most recent interval in Earth's history characterized by global greenhouse warmth on multi-million year timescales, yet our understanding of long-term climate and carbon cycle evolution in the low latitudes, and in particular the Indian Ocean, remains very poorly constrained. Here we present the first long-term sub-eccentricity-resolution stable isotope (δ 13C and δ 18O) and trace element (Mg/Ca and B/Ca) records spanning the late Paleocene–early Eocene (∼58–53 Ma) across a surface–deep hydrographic reconstruction of the northern Indian Ocean, resolving late Paleocene 405-kyr paced cyclicity and a portion of the PETM recovery. Our new records reveal a long-term warming of ∼4–5 °C at all depths in the water column, with absolute surface ocean temperatures and magnitudes of warming comparable to the low latitude Pacific. As a result of warming, we observe a long-term increase in δ 18O sw of the mixed layer, implying an increase in net evaporation. We also observe a collapse in the temperature gradient between mixed layer- and thermocline-dwelling species from ∼57–54 Ma, potentially due to either the development of a more homogeneous water column with a thicker mixed layer, or depth migration of the Morozovella in response to warming. Synchronous warming at both low and high latitudes, along with decreasing B/Ca ratios in planktic foraminifera indicating a decrease in ocean pH and/or increasing dissolved inorganic carbon, suggest that global climate was forced by rising atmospheric CO 2 concentrations during this time.

KW - Indian Ocean

KW - Paleocene-Eocene Thermal Maximum

KW - Paleogene

KW - paleoceanography

KW - paleoclimate

KW - trace elements

UR - http://www.scopus.com/inward/record.url?scp=85086580044&partnerID=8YFLogxK

U2 - 10.1016/j.epsl.2020.116414

DO - 10.1016/j.epsl.2020.116414

M3 - Article

VL - 545

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

M1 - 116414

ER -