Coccolithophores as proxy of seawater changes at orbital-to-millennial scale during middle Pleistocene Marine Isotope Stages 14-9 in North Atlantic core MD01-2446

Online Access: Get full text
doi: 10.1002/2013PA002574
Author(s): Marino, Maria; Maiorano, Patrizia; Tarantino, Francesca; Voelker, Antje; Capotondi, Lucilla; Girone, Angela; Lirer, Fabrizio; Flores, José-Abel; Naafs, B. David A.
Author Affiliation(s): Primary:
Universita degli Studi di Bari Aldo Moro, Dipartimento di Scienze della Terra e Geoambientali, Bari, Italy
Instituto Portugues do Mar e da Atmosfera, Portugal
Consiglio Nazionale delle Ricerche, Italy
Universidad de Salamanca, Spain
University of Bristol, United Kingdom
Volume Title: Paleoceanography
Source: Paleoceanography, 29(6), p.518-532. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 130 refs.; illus., incl. sketch map
Summary: Quantitative coccolithophore analyses were performed in core MD01-2446, located in the midlatitude North Atlantic, to reconstruct climatically induced sea surface water conditions throughout Marine Isotope Stages (MIS) 14-9. The data are compared to new and available paleoenvironmental proxies from the same site as well as other nearby North Atlantic records that support the coccolithophore signature at glacial-interglacial to millennial climate scale. Total coccolithophore absolute abundance increases during interglacials but abruptly drops during the colder glacial phases and deglaciations. Coccolithophore warm water taxa (wwt) indicate that MIS11c and MIS9e experienced warmer and more stable conditions throughout the whole photic zone compared to MIS13. MIS11 was a long-lasting warmer and stable interglacial characterized by a climate optimum during MIS11c when a more prominent influence of the subtropical front at the site is inferred. The wwt pattern also suggests distinct interstadial and stadial events lasting about 4-10 kyr. The glacial increases of Gephyrocapsa margereli-G. muellerae 3-4 µm along with higher values of Corg, additionally supported by the total alkenone abundance at Site U1313, indicate more productive surface waters, likely reflecting the migration of the polar front into the midlatitude North Atlantic. Distinctive peaks of G. margereli-muellerae (>4 µm), C. pelagicus pelagicus, Neogloboquadrina pachyderma left coiling, and reworked nannofossils, combined with minima in total nannofossil accumulation rate, are tracers of Heinrich-type events during MIS12 and MIS10. Additional Heinrich-type events are suggested during MIS12 and MIS14 based on biotic proxies, and we discuss possible iceberg sources at these times. Our results improve the understanding of mid-Brunhes paleoclimate and the impact on phytoplankton diversity in the midlatitude North Atlantic region. Abstract Copyright (2014), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Algae; Assemblages; Atlantic Ocean; C-13/C-12; Carbon; Cenozoic; Climate change; Coccolithophoraceae; Cores; Expedition 306; Expeditions 303/306; Foraminifera; Glaciation; Globigerinacea; Heinrich events; IODP Site U1313; IODP Site U1314; Integrated Ocean Drilling Program; Invertebrata; Isotope ratios; Isotopes; Marine environment; Marine sediments; Microfossils; Mid-Atlantic Ridge; Middle Pleistocene; Neogloboquadrina; Neogloboquadrina pachyderma; North Atlantic; Northeast Atlantic; O-18/O-16; Oxygen; Paleo-oceanography; Paleoclimatology; Paleoecology; Paleoenvironment; Paleotemperature; Plantae; Pleistocene; Productivity; Protista; Quantitative analysis; Quaternary; Rotaliina; Sea water; Sediments; Stable isotopes; Tore Seamount
Coordinates: N410000 N410000 W0325700 W0325700
N562200 N562200 W0275300 W0275300
N390300 N390300 E0123700 E0123700
Record ID: 2014067960
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom