Toarcian extreme warmth led to tropical cyclone intensification

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  • Ruhr-Universität Bochum
  • Université Claude Bernard Lyon 1
  • Universite Moulay Ismail
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Original languageEnglish
Pages (from-to)120-130
Number of pages11
JournalEarth and Planetary Science Letters
Volume425
Early online date10 Jun 2015
Publication statusPublished - 1 Sept 2015

Abstract

Models predict that tropical cyclone intensity should increase on a warming planet. Observing this relationship remains, however, a difficult task since no clear trend is yet emerging from the anthropogenic record. The geological past offers the opportunity to study this relationship by looking at episodes of extreme warmth, such as the Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, ca. 181 Ma). In this study, we document an increase in the occurrence of storm-related deposits during the onset of the T-OAE in the tide-dominated High Atlas Basin of Morocco, associated with a drastic deepening of the mean storm weather wave base. The palaeolatitude of the High Atlas Basin (18° North during the Early Jurassic) rules out winter storms as the driving mechanism behind the formation of these deposits and points to a dramatic intensification of tropical cyclone intensity during the T-OAE global warming. These new results, combined with the previously reported ubiquitous appearance of storm deposits during the T-OAE in tropical seas of the western Tethyan area, support the concept that the globally averaged intensity of tropical cyclones will increase in the coming century due to the anthropogenic climate change.

Keywords

    Climatic warming, Early Jurassic, Extreme storms, Hummocky cross-stratification, Toarcian Oceanic Anoxic Event

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Sustainable Development Goals

Cite this

Toarcian extreme warmth led to tropical cyclone intensification. / Krencker, François Nicolas; Bodin, Stéphane; Suan, Guillaume et al.
In: Earth and Planetary Science Letters, Vol. 425, 01.09.2015, p. 120-130.

Research output: Contribution to journalArticleResearchpeer review

Krencker FN, Bodin S, Suan G, Heimhofer U, Kabiri L, Immenhauser A. Toarcian extreme warmth led to tropical cyclone intensification. Earth and Planetary Science Letters. 2015 Sept 1;425:120-130. Epub 2015 Jun 10. doi: 10.1016/j.epsl.2015.06.003, 10.1016/j.epsl.2015.06.003
Krencker, François Nicolas ; Bodin, Stéphane ; Suan, Guillaume et al. / Toarcian extreme warmth led to tropical cyclone intensification. In: Earth and Planetary Science Letters. 2015 ; Vol. 425. pp. 120-130.
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title = "Toarcian extreme warmth led to tropical cyclone intensification",
abstract = "Models predict that tropical cyclone intensity should increase on a warming planet. Observing this relationship remains, however, a difficult task since no clear trend is yet emerging from the anthropogenic record. The geological past offers the opportunity to study this relationship by looking at episodes of extreme warmth, such as the Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, ca. 181 Ma). In this study, we document an increase in the occurrence of storm-related deposits during the onset of the T-OAE in the tide-dominated High Atlas Basin of Morocco, associated with a drastic deepening of the mean storm weather wave base. The palaeolatitude of the High Atlas Basin (18° North during the Early Jurassic) rules out winter storms as the driving mechanism behind the formation of these deposits and points to a dramatic intensification of tropical cyclone intensity during the T-OAE global warming. These new results, combined with the previously reported ubiquitous appearance of storm deposits during the T-OAE in tropical seas of the western Tethyan area, support the concept that the globally averaged intensity of tropical cyclones will increase in the coming century due to the anthropogenic climate change.",
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AU - Krencker, François Nicolas

AU - Bodin, Stéphane

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AU - Heimhofer, Ulrich

AU - Kabiri, Lahcen

AU - Immenhauser, Adrian

N1 - Funding Information: This research was financed by the Deutsche Forschungsgemeinschaft (DFG, project n° BO 3655/1-1 ). L. Henkel, M. Hönig and T. Kothe are thanked for their help during field expeditions and for laboratory work at Bochum. We would like to thank J.A. Wassenburg for fruitful discussions. Analytical work in the isotope laboratories at Bochum were supported by A. Niedermayr.

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N2 - Models predict that tropical cyclone intensity should increase on a warming planet. Observing this relationship remains, however, a difficult task since no clear trend is yet emerging from the anthropogenic record. The geological past offers the opportunity to study this relationship by looking at episodes of extreme warmth, such as the Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, ca. 181 Ma). In this study, we document an increase in the occurrence of storm-related deposits during the onset of the T-OAE in the tide-dominated High Atlas Basin of Morocco, associated with a drastic deepening of the mean storm weather wave base. The palaeolatitude of the High Atlas Basin (18° North during the Early Jurassic) rules out winter storms as the driving mechanism behind the formation of these deposits and points to a dramatic intensification of tropical cyclone intensity during the T-OAE global warming. These new results, combined with the previously reported ubiquitous appearance of storm deposits during the T-OAE in tropical seas of the western Tethyan area, support the concept that the globally averaged intensity of tropical cyclones will increase in the coming century due to the anthropogenic climate change.

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