Difference between revisions of "RECENT PUBLICATIONS ON FORAMINIFERA"
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| + | ==MEDITERRANEAN OUTFLOW WATER DURING THE MESSINIAN== | ||
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| + | Messinian foraminiferal stable oxygen and carbon isotopes of the Montemayor-1 core(Guadalquivir Basin, SW Spain) have been investigated. This record is exceptional tostudy the Mediterranean Outflow Water (MOW) impact on the Atlantic meridional overturning circulation (AMOC) and global climate during the Messinian because the core is near the Guadalhorce Corridor, the last Betic gateway to be closed during the early Messinian. Our results allow dating accurately its closure at 6.18 Ma. Constant benthic d18O values, high difference between benthic and planktonic d18O, and low sedimentation rates before 6.18 Ma indicate the presence of a two-layer water column, with bottom | ||
| + | winnowing due to an enhanced Mediterranean outflow current. The enhanced contribution of dense MOW to the North Atlantic Ocean likely fostered the formation of North Atlantic | ||
| + | Deep Water (NADW). After 6.18 Ma, benthic d18O values parallel that of the global glacioeustatic curve, the difference between benthic and planktonic d18O is low, and | ||
| + | sedimentation rates considerably increased. This indicates a good vertical mixing of the water column, interruption of the MOW, and a dominant glacioeustatic control on the | ||
| + | isotopic signatures. According to the role of MOW in the modern Atlantic thermohaline circulation, the reduction of the MOW after the closure of the Guadalhorce Corridor | ||
| + | might have resulted in a decreased NADW formation rate between 6.0 and 5.5 Ma weakening the AMOC and promoting northern hemisphere cooling. | ||
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| + | <font size="2">([http://www.agu.org/pubs/crossref/2012/2012PA002309.shtml ABSTRACT]) | ||
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| + | ----Pérez-Asensio, J.N., Aguirre, J., Schmiedl, G., Civis, J., 2012. [http://www.agu.org/pubs/crossref/2012/2012PA002309.shtml Impact of restriction of the Atlantic-Mediterranean gateway on the Mediterranean Outflow Water and eastern Atlantic circulation during the Messinian]. Paleoceanography 27, PA3222, doi:10.1029/2012PA002309. | ||
==DISCOVERY OF ORDOVICIAN ''Bathysiphon'' - TEST STRUCTURE AND HABITAT OF A 'LIVING FOSSIL'== | ==DISCOVERY OF ORDOVICIAN ''Bathysiphon'' - TEST STRUCTURE AND HABITAT OF A 'LIVING FOSSIL'== | ||
