http://lod.bco-dmo.org/id/dataset/991502
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2026-01-15
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Bulk sediment measurements in the eastern Pacific during the last deglaciation determined from core MAZ-1E-04 collected on cruise MAZ-I aboard the R/V El Puma in April 2015
2026-04-08
publication
2026-04-08
revision
Woods Hole Oceanographic Institution (WHOI BCO-DMO)
2026-04-13
publication
https://doi.org/10.26008/1912/bco-dmo.991502.1
Catherine V. Davis
North Carolina State University
principalInvestigator
Maria Luisa Machain-Castillo
Universidad Nacional Autónoma de México
principalInvestigator
Jorge Feliciano Ontiveros-Cuadras
Universidad Nacional Autónoma de México
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Alcorn, R., Ontiveros-Cuadras, J. F., Machain-Castillo, M. L., Davis, C. V. (2026) Bulk sediment measurements in the eastern Pacific during 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.991502.1 [access date]
Bulk sediment MAZ-1E-04 Dataset Description: Methods and Sampling: <p>Please see Alcorn et al. (2026) for a more detailed methodology.</p>
<p>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.</p>
<p>Total organic carbon (TOC %) was analyzed using a Perkin-Elmer 2400 CHN elemental analyzer with a reproducibility of 2.5% relative standard deviation (RSD).&nbsp;TOC %&nbsp;was measured to support interpretation of C:N ratios. Before analysis, inorganic carbon was dissolved with 4.5 mL of 1M H<sub>3</sub>PO<sub>4</sub> and samples were filtered onto precombusted (at 400°C for 5-8 h) glass filters. Samples were then dried at 40°C and wrapped in tin discs for measurement. Sedimentary δ<sup>15</sup>N and δ<sup>13</sup>C<sub>org</sub> were measured on the GV-IRMS interfaced with a Euro Elemental Analyzer, and %N was measured on a Perkin Elmer 2400 Elemental Analyzer. Inorganic δ<sup>13</sup>C<sub> </sub>was removed from δ<sup>13</sup>C<sub>org </sub>samples through acidification, and δ<sup>13</sup>C<sub>org </sub>results are presented relative to VPDB. Sedimentary δ<sup>15</sup>N &nbsp;was calculated using the following equation: δ<sup>15</sup>N = ((<sup>15</sup>N/<sup>14</sup>Nsample) / (<sup>15</sup>N/<sup>14</sup>N<sub>ref</sub>) – 1) * 1000 where <sup>15</sup>N/<sup>14</sup>N<sub>ref&nbsp; </sub>refers to atmospheric N<sub>2</sub>. Standards and duplicates were run every 20 samples with 0.05‰ reproducibility. Measurements of δ<sup>15</sup>N and δ<sup>13</sup>C<sub>org</sub> were taken at each 1 cm interval.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2154081 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2154081
completed
Catherine V. Davis
North Carolina State University
267-438-2198
701 Sumter St.
Columbia
SC
29208
USA
cdavis24@ncsu.edu
pointOfContact
Maria Luisa Machain-Castillo
Universidad Nacional Autónoma de México
machain@cmarl.unam.mx
pointOfContact
Jorge Feliciano Ontiveros-Cuadras
Universidad Nacional Autónoma de México
jontiveros@cmarl.unam.mx
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Depth_core
Age
d15N
d13C
pct_N
C_N_ratio
Perkin Elmer 2400 Elemental Analyzer
Euro Elemental Analyzer
gravity corer
theme
None, User defined
depth core
age
d15N
d13C
Nitrogen
ratio
featureType
BCO-DMO Standard Parameters
CHN Elemental Analyzer
Elemental Analyzer
Gravity Corer
instrument
BCO-DMO Standard Instruments
MAZ-I
service
Deployment Activity
Mexican Margin in the Eastern Tropical North Pacific
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Glacial-Interglacial Changes in Oxygen Minimum Zones Using Deep-Dwelling, Low-Oxygen Planktic Foraminifera
https://osprey.bco-dmo.org/project/914014
Glacial-Interglacial Changes in Oxygen Minimum Zones Using Deep-Dwelling, Low-Oxygen Planktic Foraminifera
<p>NSF abstract: </p>
<p>Oxygen minimum zones (OMZs) are naturally occurring regions of low oxygen found across large swaths of the ocean at depths of 100 to 1000 meters below the surface. OMZs play an important role in biogeochemical cycling and ecosystem function and any change in the expanse of their low oxygen waters can have far reaching implications for marine life and valuable fisheries resources. Marine oxygenation is variable on multiple timescales in response to global climate change, with recent observations showing that OMZs have expanded over the past half century. This project will explore promising new geochemical and morphologic proxies applicable to low-oxygen environments in the planktic foraminifer Globorotaloides hexagonus, a unicellular calcifying organism whose fossil record in seafloor sediments is well suited to reconstructing past low-oxygen environments in the water column. The project will focus on the extensive OMZ of the eastern tropical Pacific. The first goal is to evaluate and calibrate the targeted measurements for modern G. hexagonus collected live in plankton tows. The second goal is to apply these proxies to fossil specimens in sediment cores to generate records of glacial-Holocene change. The outcomes will be useable proxies for generating records of the OMZ environment, and a better understanding of how a major regional OMZ changed during the most recent period of rapid climate change. Both outcomes represent important progress towards understanding natural oscillations in the OMZ as well as modeling and planning for a changing OMZ in the face of global climate perturbations. The project will provide opportunities for undergraduate researchers as well as support a female early career researcher. </p>
<p>The marine sedimentary record is the most promising archive from which to reconstruct long term marine oxygenation. However, significant limitations exist in the available proxies for low oxygen marine environments. This project aims to address this need by evaluating and applying a range of promising geochemical (trace element and stable isotope) and morphologic (area-density and porosity) proxies relevant to low oxygen environments in the planktic foraminifer Globorotaloides hexagonus. The project will develop viable proxies based on the morphology and geochemistry of G. hexagonus shells previously collected in depth-distributed MOCNESS (Multiple Opening/Closing Net and Environmental Sensing System) tows from the eastern Pacific. The results from this proxy development in modern shells will then be ground-truthed and applied to two already well characterized sediment cores from the Mexican Margin and Panama Basin that span from the Last Glacial Maximum through the Holocene. The sediment records will be used to reconstruct past conditions in the eastern tropical Pacific OMZ, where significant questions about glacial-interglacial oxygenation persist. This research will lead to a more mechanistic understanding of how OMZs respond to climate more broadly.</p>
OMZ forams
largerWorkCitation
project
eng; USA
oceans
Mexican Margin in the Eastern Tropical North Pacific
-106.91
-106.91
22.905
22.905
2015-04-27
2015-04-29
eastern Pacific
0
BCO-DMO catalogue of parameters from Bulk sediment measurements in the eastern Pacific during 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)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/996202.rdf
Name: Depth_core
Units: centimeter (cm)
Description: <p>Depth in sediment core</p>
http://lod.bco-dmo.org/id/dataset-parameter/996203.rdf
Name: Age
Units: years before present (ybp)
Description: <p>Calibrated sediment age in years before present</p>
http://lod.bco-dmo.org/id/dataset-parameter/996204.rdf
Name: d15N
Units: per mil
Description: <p>Stable nitrogen isotope ratio of bulk sediment</p>
http://lod.bco-dmo.org/id/dataset-parameter/996205.rdf
Name: d13C
Units: per mil
Description: <p>Stable carbon isotope ratio of bulk sediment</p>
http://lod.bco-dmo.org/id/dataset-parameter/996206.rdf
Name: pct_N
Units: %N
Description: <p>Nitrogen content of bulk sediment, expressed as weight percent</p>
http://lod.bco-dmo.org/id/dataset-parameter/996207.rdf
Name: C_N_ratio
Units: unitless
Description: <p>Carbon to nitrogen ratio of bulk sediment</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
https://doi.org/10.26008/1912/bco-dmo.991502.1
download
onLine
dataset
<p>Please see Alcorn et al. (2026) for a more detailed methodology.</p>
<p>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.</p>
<p>Total organic carbon (TOC %) was analyzed using a Perkin-Elmer 2400 CHN elemental analyzer with a reproducibility of 2.5% relative standard deviation (RSD).&nbsp;TOC %&nbsp;was measured to support interpretation of C:N ratios. Before analysis, inorganic carbon was dissolved with 4.5 mL of 1M H<sub>3</sub>PO<sub>4</sub> and samples were filtered onto precombusted (at 400°C for 5-8 h) glass filters. Samples were then dried at 40°C and wrapped in tin discs for measurement. Sedimentary δ<sup>15</sup>N and δ<sup>13</sup>C<sub>org</sub> were measured on the GV-IRMS interfaced with a Euro Elemental Analyzer, and %N was measured on a Perkin Elmer 2400 Elemental Analyzer. Inorganic δ<sup>13</sup>C<sub> </sub>was removed from δ<sup>13</sup>C<sub>org </sub>samples through acidification, and δ<sup>13</sup>C<sub>org </sub>results are presented relative to VPDB. Sedimentary δ<sup>15</sup>N &nbsp;was calculated using the following equation: δ<sup>15</sup>N = ((<sup>15</sup>N/<sup>14</sup>Nsample) / (<sup>15</sup>N/<sup>14</sup>N<sub>ref</sub>) – 1) * 1000 where <sup>15</sup>N/<sup>14</sup>N<sub>ref&nbsp; </sub>refers to atmospheric N<sub>2</sub>. Standards and duplicates were run every 20 samples with 0.05‰ reproducibility. Measurements of δ<sup>15</sup>N and δ<sup>13</sup>C<sub>org</sub> were taken at each 1 cm interval.</p>
Specified by the Principal Investigator(s)
- Loaded sheet 1 from "Supplementary Table S7.xlsx" (Excel format) with missing values treated as empty string or "nd"; resource named using filename as "supplementary_table_s7-1"
- Renamed fields: "Depth (cm)" to "Depth_core", "Age (ybp)" to "Age", "δ15N (‰)" to "d15N", "δ13C (‰)" to "d13C", "%N" to "pct_N", "C:N" to "C_N_ratio"
- Exported file as "991502_v1_bulk_sediment_maz-1e-04.csv"
Specified by BCO-DMO Data Managers
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
Perkin Elmer 2400 Elemental Analyzer
Perkin Elmer 2400 Elemental Analyzer
PI Supplied Instrument Name: Perkin Elmer 2400 Elemental Analyzer PI Supplied Instrument Description:Sedimentary δ15N and δ13Corg were measured on the GV-IRMS interfaced with a Euro Elemental Analyzer, and %N was measured on a Perkin Elmer 2400 Elemental Analyzer. Instrument Name: CHN Elemental Analyzer Instrument Short Name:CHN_EA Instrument Description: A CHN Elemental Analyzer is used for the determination of carbon, hydrogen, and nitrogen content in organic and other types of materials, including solids, liquids, volatile, and viscous samples.
Euro Elemental Analyzer
Euro Elemental Analyzer
PI Supplied Instrument Name: Euro Elemental Analyzer PI Supplied Instrument Description:Sedimentary δ15N and δ13Corg were measured on the GV-IRMS interfaced with a Euro Elemental Analyzer, and %N was measured on a Perkin Elmer 2400 Elemental Analyzer. Instrument Name: Elemental Analyzer Instrument Short Name: Instrument Description: Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB01/
gravity corer
gravity corer
PI Supplied Instrument Name: gravity corer PI Supplied Instrument Description: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. Instrument Name: Gravity Corer Instrument Short Name:Gravity Corer Instrument Description: The gravity corer allows researchers to sample sediment layers at the bottom of lakes or oceans. The coring device is deployed from the ship and gravity carries it to the seafloor. (http://www.whoi.edu/instruments/viewInstrument.do?id=1079). Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/51/
Cruise: MAZ-I
MAZ-I
R/V El Puma
vessel
MAZ-I
Alejandro Rodríguez-Ramírez
Universidad Nacional Autónoma de México
R/V El Puma
vessel