http://lod.bco-dmo.org/id/dataset/813159
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
2020-05-27
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Porosity from sediment cores collected on the R/V Nathaniel B. Palmer cruise NBP1601 to the West Antarctic continental shelf in January of 2016
2020-06-08
publication
2020-06-08
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2020-06-17
publication
https://doi.org/10.26008/1912/bco-dmo.813159.1
David J. Burdige
Old Dominion University
principalInvestigator
John P Christensen
New England Oceanographic Laboratory
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: Burdige, D., Christensen , J. (2020) Porosity from sediment cores collected on the R/V Nathaniel B. Palmer cruise NBP1601 to the West Antarctic continental shelf in January of 2016. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-06-08 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.813159.1 [access date]
Dataset Description: <p>Porosity from sediment cores collected on the R/V Nathaniel B. Palmer cruise NBP1601 to the West Antarctic continental shelf in January of 2016.</p> Methods and Sampling: Sediment and pore water collection:
Short sediment cores were collected using a Bowers & Connelly megacorer, a multiple coring device that can collect ~20-40 cm long sediment cores with undisturbed sediment surfaces. At two sites (stations 41 and 64) longer cores (up to ~2 m) were also collected with a Kasten corer.
Megacorer cores were either sectioned for solid phase analysis, profiled with polarographic microelectrodes to determine dissolved O2 concentrations, or sectioned in a cold van under N2 for pore water sample extraction. Samples for solid phase analyses were placed in pre-cleaned screw-capped vials and frozen for porosity determinations at the New England Oceanographic Laboratory (NEOL).
Kasten cores were brought into a large cold room on-board ship, laid on their side and one side of the core box removed to expose the sediment in the core. A plastic block was placed against the top of the core to prevent slumping of the sediment during processing, and pore waters were collected from these cores using Rhizon samplers inserted directly into the cores at measured intervals. After pore water sampling was complete, samples for solid phase analyses were removed from the cores with plastic spoons and again placed in pre-cleaned screw-capped vials for porosity determinations.
While it is possible to recover cores with intact sediment-water interfaces using a megacorer, loss of surface sediments is typical during Kasten coring, making it not possible to directly determine absolute depths below the sediment-water interface in a Kasten core. We therefore determined the absolute depths of pore water and solid phase sample intervals from Kasten cores by aligning Kasten core profiles of pore water alkalinity to megacore alkalinity profiles from the same site (Berelson et al., 2005; Komada et al., 2016).
Sediment porosity determination:
The water content of the frozen porosity samples was determined by weight difference, where each sample was thawed, and a portion weighed, dried at 60°C for 24 hours and then reweighed. The porosity was expressed in terms of ml of seawater per cubic centimeter of whole sediments, where the weight of dried sediment was reduced by the weight of sea salts within the pore water (assuming bottom water salinity), and the volume of dried sediments was calculated assuming a dry density of 2.65 g cm-3 (Christensen, 1989).
Funding provided by NSF Office of Polar Programs (formerly NSF PLR) (NSF OPP) Award Number: OPP-1551195 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1551195
completed
David J. Burdige
Old Dominion University
757-683-4930
Dept. of Ocean, Earth and Atmospheric Sciences
Norfolk
VA
23529
USA
dburdige@odu.edu
pointOfContact
John P Christensen
New England Oceanographic Laboratory
207-725-0681
74 Orion Street Suite 1
Brunswick
ME
04011
USA
jchriste@newenglandoceanlab.org
pointOfContact
asNeeded
Dataset Version: 1
Unknown
St_ID
Sa_ID
Core
Depth
Error
Porosity
ISO_DateTime_UTC
Lat
Lon
Kasten corer
Bowers & Connelly megacorer
theme
None, User defined
station
sample identification
sample type
depth below seafloor
sample description
sediment porosity
ISO_DateTime_UTC
latitude
longitude
featureType
BCO-DMO Standard Parameters
Gravity Corer
Multi Corer
instrument
BCO-DMO Standard Instruments
NBP1601
service
Deployment Activity
West Antarctic Shelf
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.
Organic Carbon Oxidation and Iron Remobilization by West Antarctic Shelf Sediments
https://osprey.bco-dmo.org/project/806864
Organic Carbon Oxidation and Iron Remobilization by West Antarctic Shelf Sediments
<p>NSF Award Abstract:</p>
<p>General Statement:</p>
<p>The continental shelf region west of the Antarctic Peninsula has recently undergone dramatic changes and ecosystem shifts, and the community of organisms that live in, or feed off, the sea floor sediments is being impacted by species invasions from the north. Previous studies of these sediments indicate that this community may consume much more of the regional productivity than previously estimated, suggesting that sediments are a rich and important component of this ecosystem and one that may be ripe for dramatic change. Furthermore, under richer sediment conditions, iron is mobilized and released back to the water column. Since productivity in this ecosystem is thought to be limited by the availability of iron, increased rates of iron release from these sediments could stimulate productivity and promote greater overall ecosystem change. In this research, a variety of sites across the shelf region will be sampled to accurately evaluate the role of sediments in consuming ecosystem productivity and to estimate the current level of iron release from the sediments. This project will provide a baseline set of sediment results that will present a more complete picture of the west Antarctic shelf ecosystem, will allow for comparison with water column measurements and for evaluation of the fundamental workings of this important ecosystem. This is particularly important since high latitude systems may be vulnerable to the effects of climate fluctuations. Both graduate and undergraduate students will be trained. Presentations will be made at scientific meetings, at other universities, and at outreach events. A project web site will present key results to the public and explain how this new information improves understanding of Antarctic ecosystems.</p>
<p>
Technical Description of Project:<br />
In order to determine the role of sediments within the west Antarctic shelf ecosystem, this project will determine the rates of sediment organic matter oxidation at a variety of sites across the Palmer Long Term Ecosystem Research (LTER) study region. To estimate the rates of release of iron and manganese from the sediments, these same sites will be sampled for detailed vertical distributions of the concentrations of these metals both in the porewaters and in important mineral phases. Since sediment sampling will be done at LTER sites, the sediment data can be correlated with the rich productivity data set from the LTER. In detail, the project: a) will determine the rates of oxygen consumption, organic carbon oxidation, nutrient release, and iron mobilization by shelf sediments west of the Antarctic Peninsula; b) will investigate the vertical distribution of diagenetic reactions within the sediments; and c) will assess the regional importance of these sediment rates. Sediment cores will be used to determine sediment-water fluxes of dissolved oxygen, total carbon dioxide, nutrients, and the vertical distributions of these dissolved compounds, as well as iron and manganese in the pore waters. Bulk sediment properties of porosity, organic carbon and nitrogen content, carbonate content, biogenic silica content, and multiple species of solid-phase iron, manganese, and sulfur species will also be determined. These measurements will allow determination of total organic carbon oxidation and denitrification rates, and the proportion of aerobic versus anaerobic respiration at each site. Sediment diagenetic modeling will link the processes of organic matter oxidation to metal mobilization. Pore water and solid phase iron and manganese distributions will be used to model iron diagenesis in these sediments and to estimate the iron flux from the sediments to the overlying waters. Finally, the overall regional average and distribution of the sediment processes will be compared with the distributions of seasonally averaged chlorophyll biomass and productivity.</p>
Antarctic Shelf Sediments
largerWorkCitation
project
eng; USA
oceans
West Antarctic Shelf
-71.2217
-62.7317
-67.7717
-64.1583
2016-01-14
2019-01-28
West Antarctic Continental Shelf
0
BCO-DMO catalogue of parameters from Porosity from sediment cores collected on the R/V Nathaniel B. Palmer cruise NBP1601 to the West Antarctic continental shelf in January of 2016
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/814548.rdf
Name: St_ID
Units: unitless
Description: <p>station ID number</p>
http://lod.bco-dmo.org/id/dataset-parameter/814549.rdf
Name: Sa_ID
Units: unitless
Description: <p>sample ID (station ID #-core ID #-sample #)</p>
http://lod.bco-dmo.org/id/dataset-parameter/814550.rdf
Name: Core
Units: unitless
Description: <p>core type (M = mega-corer; K = Kasten core)</p>
http://lod.bco-dmo.org/id/dataset-parameter/814551.rdf
Name: Depth
Units: centimeters (cm)
Description: <p>sediment depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/814552.rdf
Name: Error
Units: centimeters (cm)
Description: <p>half of the thickness of the sediment sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/814553.rdf
Name: Porosity
Units: ml porewater/cm^3 total sediment
Description: <p>sediment porosity</p>
http://lod.bco-dmo.org/id/dataset-parameter/814554.rdf
Name: ISO_DateTime_UTC
Units: yyyy-MM-dd'T'HH:mm'Z'
Description: <p>station timestamp (UTC) in ISO 8601 format yyyy-mm-ddTHH:MM</p>
http://lod.bco-dmo.org/id/dataset-parameter/814555.rdf
Name: Lat
Units: decimal degrees
Description: <p>station latitude, south is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/814556.rdf
Name: Lon
Units: decimal degrees
Description: <p>station longitude, west is negative</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
18988
https://darchive.mblwhoilibrary.org/bitstream/1912/25875/1/dataset-813159_sediment-porosity__v1.tsv
download
https://doi.org/10.26008/1912/bco-dmo.813159.1
download
onLine
dataset
Sediment and pore water collection:
Short sediment cores were collected using a Bowers & Connelly megacorer, a multiple coring device that can collect ~20-40 cm long sediment cores with undisturbed sediment surfaces. At two sites (stations 41 and 64) longer cores (up to ~2 m) were also collected with a Kasten corer.
Megacorer cores were either sectioned for solid phase analysis, profiled with polarographic microelectrodes to determine dissolved O2 concentrations, or sectioned in a cold van under N2 for pore water sample extraction. Samples for solid phase analyses were placed in pre-cleaned screw-capped vials and frozen for porosity determinations at the New England Oceanographic Laboratory (NEOL).
Kasten cores were brought into a large cold room on-board ship, laid on their side and one side of the core box removed to expose the sediment in the core. A plastic block was placed against the top of the core to prevent slumping of the sediment during processing, and pore waters were collected from these cores using Rhizon samplers inserted directly into the cores at measured intervals. After pore water sampling was complete, samples for solid phase analyses were removed from the cores with plastic spoons and again placed in pre-cleaned screw-capped vials for porosity determinations.
While it is possible to recover cores with intact sediment-water interfaces using a megacorer, loss of surface sediments is typical during Kasten coring, making it not possible to directly determine absolute depths below the sediment-water interface in a Kasten core. We therefore determined the absolute depths of pore water and solid phase sample intervals from Kasten cores by aligning Kasten core profiles of pore water alkalinity to megacore alkalinity profiles from the same site (Berelson et al., 2005; Komada et al., 2016).
Sediment porosity determination:
The water content of the frozen porosity samples was determined by weight difference, where each sample was thawed, and a portion weighed, dried at 60°C for 24 hours and then reweighed. The porosity was expressed in terms of ml of seawater per cubic centimeter of whole sediments, where the weight of dried sediment was reduced by the weight of sea salts within the pore water (assuming bottom water salinity), and the volume of dried sediments was calculated assuming a dry density of 2.65 g cm-3 (Christensen, 1989).
Specified by the Principal Investigator(s)
BCO-DMO Data Manager Processing Notes:
* Data from file "porosity.txt" imported into the BCO-DMO data system.
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions (spaces, +, and - changed to underscores).
* blank values in this dataset are displayed as "nd" for "no data." nd is the default missing data identifier in the BCO-DMO system.
* Joined with supplemental station information file to add station lat, lon, and ISO 8601 timestamp (UTC) into the dataset.
Specified by the Principal Investigator(s)
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
Kasten corer
Kasten corer
PI Supplied Instrument Name: Kasten 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/
Bowers & Connelly megacorer
Bowers & Connelly megacorer
PI Supplied Instrument Name: Bowers & Connelly megacorer Instrument Name: Multi Corer Instrument Short Name:Multi Corer Instrument Description: The Multi Corer is a benthic coring device used to collect multiple, simultaneous, undisturbed sediment/water samples from the seafloor. Multiple coring tubes with varying sampling capacity depending on tube dimensions are mounted in a frame designed to sample the deep ocean seafloor. For more information, see Barnett et al. (1984) in Oceanologica Acta, 7, pp. 399-408. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/51/
Cruise: NBP1601
NBP1601
Community Standard Description
International Council for the Exploration of the Sea
RVIB Nathaniel B. Palmer
vessel
NBP1601
David J. Burdige
Old Dominion University
Community Standard Description
International Council for the Exploration of the Sea
RVIB Nathaniel B. Palmer
vessel