©2026 Biological and Chemical Oceanography Data Management Office.The structure and drivers of oxygen minimum zone (OMZ) evolution in the Eastern Tropical North Pacific (ETNP) are investigated from ~20.7-10 ka using a multi-proxy from core MAZ-1E-04 (22°54.29’N, 106°54.59’W; 1463 m depth). Understanding how OMZ vertical structure changed during past glacial/interglacial cycles will help elucidate the drivers and patterns of OMZ expansion/contraction on longer timescales. Here, multispecies foraminiferal oxygen and carbon isotopes determined from core MAZ-1...
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Please see Alcorn et al. (2026) for a more detailed methodology.
Core MAZ-1E-04 (MAZ-I E04G) was collected on the oceanographic cruise MAZ-I aboard the R/V "El Puma" on April 28, 2015 using a gravity corer.
The species used in these analyses are Globigerinoides ruber (urn:lsid:marinespecies.org:taxname:113444), Neogloboquadrina dutertrei (urn:lsid:marinespecies.org:taxname:113473), Globorotaloides hexagonus (urn:lsid:marinespecies.org:taxname:1026605), Uvigerina (urn:lsid:marinespecies.org:taxname:112281) spp.
Individuals were picked from ~50 samples spanning from ~20.7 to ~10 ka. These samples are from the >150 µm size fractionation with an average mass of 107.4 μg.
Samples were lightly crushed using glass slides, transferred to microcentrifuge tubes, and cleaned by ultrasonication in Milli-Q water and then methanol.
Samples were analyzed at the University of South Carolina using a Thermo Scientific DELTA Q Continuous Flow Isotope Ratio Mass Spectrometer coupled with a GasBench Plus.
Isotopic analysis was previously performed on ~20 samples of N. dutertrei and G. hexagonus at Yale Analytical and Stable Isotope Center on a Kiel IV Carbonate Device and was added to our results.
Analysis of same sampling events
Analysis of same sampling events
Analysis of same sampling events
Analysis of same sampling events
Analysis of same sampling events
Alcorn, R., Tappa, E., Machain-Castillo, M. L., Davis, C. V. (2026). Multispecies foraminiferal oxygen and carbon isotopes in the eastern Pacific through the last deglaciation determined from core MAZ-1E-04 collected on cruise MAZ-I aboard the R/V El Puma in April 2015. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-04-08 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.991484.1 [access date]
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