The Weissert Event similar to 133 million years ago marked a profound global cooling that punctuated the Early Cretaceous greenhouse. We present modelling, high-resolution bulk organic carbon isotopes and chronostratigraphically calibrated sea surface temperature (SSTs) based on an organic paleothermometer (the TEX86 proxy), which capture the Weissert Event in the semi-enclosed Weddell Sea basin, offshore Antarctica (paleolatitude similar to 54 degrees S; paleowater depth similar to 500 meters). We document a similar to 3-4 degrees C drop in SST coinciding with the Weissert cold end, and converge the Weddell Sea data, climate simulations and available worldwide multi-proxy based temperature data towards one unifying solution providing a best-fit between all lines of evidence. The outcome confirms a 3.0 degrees C (+/- 1.7 degrees C) global mean surface cooling across the Weissert Event, which translates into a similar to 40% drop in atmospheric pCO(2) over a period of similar to 700 thousand years. Consistent with geologic evidence, this pCO(2) drop favoured the potential build-up of local polar ice.

Impact of global cooling on Early Cretaceous high pCO2 / L. Cavalheiro, T. Wagner, S. Steinig, C. Bottini, W. Dummann, O. Esegbue, G. Gambacorta, V. Giraldo-Gómez, A. Farnsworth, S. Flögel, P. Hofmann, D.J. Lunt, J. Rethemeyer4, E. Erba. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 12:1(2021 Sep 13), pp. 5411.1-5411.11. [10.1038/s41467-021-25706-0]

Impact of global cooling on Early Cretaceous high pCO2

L. Cavalheiro
Primo
Writing – Original Draft Preparation
;
C. Bottini
Formal Analysis
;
G. Gambacorta;E. Erba
Ultimo
Funding Acquisition
2021-09-13

Abstract

The Weissert Event similar to 133 million years ago marked a profound global cooling that punctuated the Early Cretaceous greenhouse. We present modelling, high-resolution bulk organic carbon isotopes and chronostratigraphically calibrated sea surface temperature (SSTs) based on an organic paleothermometer (the TEX86 proxy), which capture the Weissert Event in the semi-enclosed Weddell Sea basin, offshore Antarctica (paleolatitude similar to 54 degrees S; paleowater depth similar to 500 meters). We document a similar to 3-4 degrees C drop in SST coinciding with the Weissert cold end, and converge the Weddell Sea data, climate simulations and available worldwide multi-proxy based temperature data towards one unifying solution providing a best-fit between all lines of evidence. The outcome confirms a 3.0 degrees C (+/- 1.7 degrees C) global mean surface cooling across the Weissert Event, which translates into a similar to 40% drop in atmospheric pCO(2) over a period of similar to 700 thousand years. Consistent with geologic evidence, this pCO(2) drop favoured the potential build-up of local polar ice.
Settore GEO/02 - Geologia Stratigrafica e Sedimentologica
Settore GEO/01 - Paleontologia e Paleoecologia
Settore GEO/08 - Geochimica e Vulcanologia
DECC18MGIUD_01 - Dipartimenti di Eccellenza 2018-2022 - Dipartimento di SCIENZE DELLA TERRA "ARDITO DESIO" - GIUDICI, MAURO - DECC - Bando Dipartimenti di Eccellenza - 2018
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/899076
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