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Southern ocean warming, sea level and hydrological change during the Paleocene-Eocene thermal maximum

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العنوان: Southern ocean warming, sea level and hydrological change during the Paleocene-Eocene thermal maximum
المؤلفون: A. Sluijs, P. K. Bijl, S. Schouten, U. Röhl, G.-J. Reichart, H. Brinkhuis
المصدر: Climate of the Past, Vol 7, Iss 1, Pp 47-61 (2011)
بيانات النشر: Copernicus Publications, 2011.
سنة النشر: 2011
المجموعة: LCC:Environmental pollution
LCC:Environmental protection
LCC:Environmental sciences
مصطلحات موضوعية: Environmental pollution, TD172-193.5, Environmental protection, TD169-171.8, Environmental sciences, GE1-350
الوصف: A brief (~150 kyr) period of widespread global average surface warming marks the transition between the Paleocene and Eocene epochs, ~56 million years ago. This so-called "Paleocene-Eocene thermal maximum" (PETM) is associated with the massive injection of 13C-depleted carbon, reflected in a negative carbon isotope excursion (CIE). Biotic responses include a global abundance peak (acme) of the subtropical dinoflagellate Apectodinium. Here we identify the PETM in a marine sedimentary sequence deposited on the East Tasman Plateau at Ocean Drilling Program (ODP) Site 1172 and show, based on the organic paleothermometer TEX86, that southwest Pacific sea surface temperatures increased from ~26 °C to ~33°C during the PETM. Such temperatures before, during and after the PETM are >10 °C warmer than predicted by paleoclimate model simulations for this latitude. In part, this discrepancy may be explained by potential seasonal biases in the TEX86 proxy in polar oceans. Additionally, the data suggest that not only Arctic, but also Antarctic temperatures may be underestimated in simulations of ancient greenhouse climates by current generation fully coupled climate models. An early influx of abundant Apectodinium confirms that environmental change preceded the CIE on a global scale. Organic dinoflagellate cyst assemblages suggest a local decrease in the amount of river run off reaching the core site during the PETM, possibly in concert with eustatic rise. Moreover, the assemblages suggest changes in seasonality of the regional hydrological system and storm activity. Finally, significant variation in dinoflagellate cyst assemblages during the PETM indicates that southwest Pacific climates varied significantly over time scales of 103 – 104 years during this event, a finding comparable to similar studies of PETM successions from the New Jersey Shelf.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1814-9324
1814-9332
Relation: http://www.clim-past.net/7/47/2011/cp-7-47-2011.pdf; https://doaj.org/toc/1814-9324; https://doaj.org/toc/1814-9332
DOI: 10.5194/cp-7-47-2011
URL الوصول: https://doaj.org/article/49394ca1f6204f508f44ae0d7d21d5da
رقم الانضمام: edsdoj.49394ca1f6204f508f44ae0d7d21d5da
قاعدة البيانات: Directory of Open Access Journals
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