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Middle Miocene environmental change : a multi-proxy study from the eastern Atlantic Ocean at the Porcupine Basin (IODP Leg 307)

(2012) GB2012, Abstracts. p.140-140
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Abstract
During the Middle Miocene Climatic Optimum (MMCO; 17-14.5 Ma) the relatively warm climate of the Miocene reached peak values. After the MMCO, the global climate started cooling. This happened through several short-lived cooling events, represented by positive oxygen isotope excursions: the Mi-events. Associated events are East Antarctic Ice Sheet growth and potential Northern Hemisphere ice expansion. The causes and consequences of the Mi-events are not well constrained yet. For this reason we aim to examine the role of the Gulf Stream in the cooling and subsequent warming of the Mi-events, since it is a possible mechanism to amplify or reduce regional changes in North-western Europe. Integrated Ocean Drilling Program (IODP) Leg 307 recovered a high resolution record from the Middle Miocene of the Porcupine Basin (offshore south-western Ireland), a region under influence of the Gulf Stream. We have extracted well-preserved palynomorphs (mainly organic-walled dinoflagellate cysts (see figure), acritarchs, some pollen) and organic molecules for paleothermometry (e.g. TEX86 and UK’37) from core 1318B. With these proxies, the development of the Mi-4 event is reconstructed on high resolution, by assessing e.g. temperature, sea level, thermocline depth and productivity. First results indicate a pronounced cooling during Mi-4 as recorded simultaneously in dinoflagellate cyst assemblages, TEX86 and Uk’37. The presented results will focus in detail on the phasing and rates of change in the reconstructed Mi-events.

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MLA
Quaijtaal, Willemijn, Stefan Schouten, Timme Donders, et al. “Middle Miocene Environmental Change : a Multi-proxy Study from the Eastern Atlantic Ocean at the Porcupine Basin (IODP Leg 307).” GB2012, Abstracts. 2012. 140–140. Print.
APA
Quaijtaal, W., Schouten, S., Donders, T., & Louwye, S. (2012). Middle Miocene environmental change : a multi-proxy study from the eastern Atlantic Ocean at the Porcupine Basin (IODP Leg 307). GB2012, Abstracts (pp. 140–140). Presented at the 4th International Geologica Belgica Meeting 2012 (GB-2012): Moving plates and melting icecaps : processes and forcing factors in geology.
Chicago author-date
Quaijtaal, Willemijn, Stefan Schouten, Timme Donders, and Stephen Louwye. 2012. “Middle Miocene Environmental Change : a Multi-proxy Study from the Eastern Atlantic Ocean at the Porcupine Basin (IODP Leg 307).” In GB2012, Abstracts, 140–140.
Chicago author-date (all authors)
Quaijtaal, Willemijn, Stefan Schouten, Timme Donders, and Stephen Louwye. 2012. “Middle Miocene Environmental Change : a Multi-proxy Study from the Eastern Atlantic Ocean at the Porcupine Basin (IODP Leg 307).” In GB2012, Abstracts, 140–140.
Vancouver
1.
Quaijtaal W, Schouten S, Donders T, Louwye S. Middle Miocene environmental change : a multi-proxy study from the eastern Atlantic Ocean at the Porcupine Basin (IODP Leg 307). GB2012, Abstracts. 2012. p. 140–140.
IEEE
[1]
W. Quaijtaal, S. Schouten, T. Donders, and S. Louwye, “Middle Miocene environmental change : a multi-proxy study from the eastern Atlantic Ocean at the Porcupine Basin (IODP Leg 307),” in GB2012, Abstracts, Brussels, Belgium, 2012, pp. 140–140.
@inproceedings{4414148,
  abstract     = {During the Middle Miocene Climatic Optimum (MMCO; 17-14.5 Ma) the relatively warm climate of the Miocene reached peak values. After the MMCO, the global climate started cooling. This happened through several short-lived cooling events, represented by positive oxygen isotope excursions: the Mi-events. Associated events are East Antarctic Ice Sheet growth and potential Northern Hemisphere ice expansion. The causes and consequences of the Mi-events are not well constrained yet. For this reason we aim to examine the role of the Gulf Stream in the cooling and subsequent warming of the Mi-events, since it is a possible mechanism to amplify or reduce regional changes in North-western Europe.
Integrated Ocean Drilling Program (IODP) Leg 307 recovered a high resolution record from the Middle Miocene of the Porcupine Basin (offshore south-western Ireland), a region under influence of the Gulf Stream. We have extracted well-preserved palynomorphs (mainly organic-walled dinoflagellate cysts (see figure), acritarchs, some pollen) and organic molecules for paleothermometry (e.g. TEX86 and UK’37) from core 1318B. With these proxies, the development of the Mi-4 event is reconstructed on high resolution, by assessing e.g. temperature, sea level, thermocline depth and productivity. First results indicate a pronounced cooling during Mi-4 as recorded simultaneously in dinoflagellate cyst assemblages, TEX86 and Uk’37. The presented results will focus in detail on the phasing and rates of change in the reconstructed Mi-events.},
  author       = {Quaijtaal, Willemijn and Schouten, Stefan and Donders, Timme and Louwye, Stephen},
  booktitle    = {GB2012, Abstracts},
  language     = {eng},
  location     = {Brussels, Belgium},
  pages        = {140--140},
  title        = {Middle Miocene environmental change : a multi-proxy study from the eastern Atlantic Ocean at the Porcupine Basin (IODP Leg 307)},
  year         = {2012},
}