Tracking the equatorial front in the eastern Equatorial Pacific Ocean by the isotopic and faunal composition of planktonic Foraminifera

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doi: 10.1016/j.marmicro.2011.01.001
Author(s): Rincón-Martínez, Daniel; Steph, Silke; Lamy, Frank; Mix, Alan; Tiedemann, Ralf
Author Affiliation(s): Primary:
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
Other:
University of Bremen, Germany
Oregon State University, United States
Volume Title: Marine Micropaleontology
Source: Marine Micropaleontology, 79(1-2), p.24-40. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. Supplemental information/data is available in the online version of this article. 76 refs.; illus., incl. 3 tables
Summary: Core-top samples from the eastern tropical Pacific (10°N to 20°S) were used to test whether the ratio between Globorotalia menardii cultrata and Neogloboquadrina dutertrei abundance (Rc/d) and the oxygen isotope composition (δ18O) of planktonic foraminifera can be used as proxies for the latitudinal position of the Equatorial Front. Specifically, this study compares the δ18O values of eight species of planktonic foraminifera (Globigerinoides ruber sensu stricto (ss) and sensu lato (sl), Globigerinoides sacculifer, Globigerinoides triloba, Pulleniatina obliquiloculata, Neogloboquadrina dutertrei, Globorotalia menardii menardii, Globorotalia menardii cultrata and Globorotalia tumida) with the seasonal hydrography of the region and evaluates the application of each species or combination of species for paleoceanographic reconstructions. The results are consistent with sea surface temperature and water column stratification patterns. We found that in samples north of 1°N the Rc/d values tend to be higher and δ18O values of G. ruber, G. sacculifer, G. triloba, P. obliquiloculata, N. dutertrei, and G. menardii cultrata tend to be lower than those from samples located south of 1°N. We suggest that the combined use of Rc/d and the δ18O difference between G. ruber and G. tumida or between P. obliquiloculata and G. tumida are the most suitable tools for reconstructing changes in the latitudinal position of the Equatorial Front and changes in the thermal stratification of the upper water column in the eastern tropical Pacific. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 10 Paleontology, Invertebrate; Annual variations; Carnegie Ridge; Currents; DSDP Site 506; Deep Sea Drilling Project; East Pacific; Equatorial Front; Equatorial Pacific; Foraminifera; Globigerinacea; Globigerinidae; Globigerinoides; Globorotalia; Globorotalia menardii; Globorotaliidae; IPOD; Invertebrata; Isotope ratios; Isotopes; Leg 111; Leg 138; Leg 202; Leg 70; Living taxa; Neogloboquadrina; Neogloboquadrina dutertrei; North Pacific; Northeast Pacific; O-18/O-16; ODP Site 1239; ODP Site 1240; ODP Site 1242; ODP Site 677; ODP Site 847; Ocean Drilling Program; Ocean currents; Oxygen; Pacific Ocean; Panama Basin; Planktonic taxa; Protista; Rotaliina; Seasonal variations; South Pacific; Southeast Pacific; Stable isotopes; Tests
Coordinates: N000100 N000100 W0822800 W0822800
N075100 N075100 W0833600 W0833600
S004000 S004000 W0820500 W0820500
N001134 N001136 W0951911 W0951914
Record ID: 2011099190
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands