http://lod.bco-dmo.org/id/dataset/944947
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
2024-12-03
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Benthic fluxes collected in August 2018 and July 2019 in northern Gulf of Mexico shelf on R/V Pelican
2024-12-03
publication
2024-12-03
revision
BCO-DMO Linked Data URI
2024-12-03
creation
http://lod.bco-dmo.org/id/dataset/944947
Kanchan Maiti
Louisiana State University
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: Maiti, K., Beck, H. (2024) Benthic fluxes collected in August 2018 and July 2019 in northern Gulf of Mexico shelf on R/V Pelican. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-12-03 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/944947 [access date]
Methods and Sampling: <p>Benthic fluxes were measured&nbsp;along the northern Gulf of Mexico shelf during cruises aboard the R/V Pelican in August 2018 and July 2019.&nbsp; Sediment cores, incubation experiments, and in-situ measurements from a custom made benthic lander all provided data on&nbsp;benthic fluxes of nutrients, dissolved inorganic carbon (DIC), and total alkalinity (TALK) as well as estimates of total oxygen and diffusive oxygen utilization.&nbsp;</p>
<p>Intact sediment cores&nbsp;were collected in triplicate from ____ (** how many stations? **&nbsp; five stations each year?) each station using an Ocean Instruments MC800 multi-corer and utilized for benthic flux measurements through whole core incubation technique (** reference? **).&nbsp;Temperature-controlled recirculating water baths adjusted to&nbsp;the bottom water&nbsp;temperature were used for all incubation experiments. Filtered bottom water was used to&nbsp;gradually fill up the core tube with minimum disturbance to the sediment-water interface. The&nbsp;overlying water column height was adjusted to 25 cm from the sediment surface to&nbsp;&nbsp;ensure similar water column volume among all cores using custom PVC core caps. Care was&nbsp;taken to avoid any visible air bubbles or headspace. The custom designed lids are fitted with two&nbsp;O-rings for gas-tight incubations, and include one tube attachment for the corresponding water&nbsp;reservoir, one tube attachment for sample extraction, and two tube attachments that connect to&nbsp;each other in a peristaltic pump, allowing continuous flow and circulation in the core for the&nbsp;entire duration of the incubation. Sediment cores were&nbsp;fully submerged into the temperature-controlled water bath, and reservoir tanks along with the&nbsp;incubation water bath were covered with an opaque shroud to ensure no primary production.&nbsp;</p>
<p>A custom benthic lander system was deployed with minimum sediment disturbance at each of&nbsp; the stations to carry out in situ flux measurements for total oxygen utilization (TOU). The lander system was&nbsp; equipped with chambers that each seal a sediment surface area of 840 square centimeters and a volume of&nbsp; approximately 16 liters. Each chamber included a magnetically coupled stirrer that mixed the&nbsp; water within the chamber uniformly in about 20 minutes at 12-16 rpm and produced a 300-400 μm diffusive boundary layer. Leakage was calculated from the loss of a CsBr tracer from samples taken from each chamber every 4 hours. Three of the benthic chambers were fitted with Seaguard dissolved oxygen (DO)&nbsp; optode sensors that directly measured DO every 15 minutes for the duration of the 22&nbsp; hour deployment.</p>
<p>Sediment oxygen penetration depth (OPD) was measured with a Unisense in situ 130 microprofiler system, which was equipped with two oxygen sensors (250 μm) and a&nbsp;resistivity sensor. The position of the sediment-water interface (SWI) was determined relative to the in situ oxygen profiles using a modified version of the technique of Sweerts 133 et al.&nbsp; (** ? what is this reference?**)&nbsp;(Revsbech 1989; Sweerts et al. 1989; Rabouille et al. 2003). Diffusive&nbsp;oxygen utilization (DOU) was calculated with Cai and Sayles’s adaptation of Fick’s law of diffusion using the oxygen gradient in coastal sediments.</p>
<p>Measurement details:</p>
<ul>
<li>DIC was measured with an Apollo SciTech DIC multisample analyzer (AS-C6L) with a laser-based CO2 detector.&nbsp;Certified reference material from batch 180 provided by Dr. Andrew Dickinson was used for calibration for DIC and TA measurements.</li>
<li>TA was measured with an Apollo SciTech Total Alkalinity titrator (AS-ALK2). Certified reference material from batch 180 provided by Dr. Andrew Dickinson was used for calibration for DIC and TA measurements.</li>
<li>NO2+NO3 was measured using EPA method 353.4</li>
<li>NH4 was measured using EPA method 350.1</li>
<li>PO4 was measured using EPA method 365.1</li>
<li>SiO4 was measured using using the method described in Strickland and Parsons (1968).</li>
<li>Dissolved nutrinet analysis was caried out using a Seal Analytical Auto Analyzer.</li>
<li>Oxygen penetration depth (OPD) was measured in situ with a Unisense microprofiler and utilized to caluclate DOU.</li>
<li>TOU was measured using custom benthic lander system.</li>
</ul>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1756788 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1756788
onGoing
Kanchan Maiti
Louisiana State University
225-578-4531
1143 Energy Coast Env Bldg
Baton Rouge
LA
70803
USA
kmaiti@lsu.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Latitude
Longitude
ISO_Date_UTC
O2_flux
DIC_flux
TA_flux
NO2_plus_NO3
NH4_flux
PO4_flux
SiO4_flux
POC_percent
OPD
TOU
DOU
Apollo SciTech Total Alkalinity titrator (AS-ALK2)
Apollo SciTech DIC multisample analyzer (AS-C6L) with a laser-based CO2 detector.
custom benthic lander system
Temperature-controlled recirculating water bath
Seal Analytical Auto Analyzer
Ocean Instruments MC800 multi-corer
Seaguard dissolved oxygen (DO) optode sensors
Unisense microprofiler
theme
None, User defined
latitude
longitude
date
dissolved Oxygen
dissolved inorganic Carbon
total alkalinity (TA)
nitrate plus nitrite
Ammonium
reactive phosphorus (PO4)
Silicate (reactive silica)
particulate organic Carbon (POC)
depth below seafloor
Total Oxygen Utilization
Diffusive Oxygen Utilization
featureType
BCO-DMO Standard Parameters
Apollo SciTech AS-ALK2 total alkalinity titrator
Apollo SciTech AS-C6L Dissolved Inorganic Carbon (DIC) analyzer
benthic lander
circulating water bath
Nutrient Autoanalyzer
Ocean Instruments MC-800 Multi corer
Optode
Unisense oxygen microsensor
instrument
BCO-DMO Standard Instruments
PE20-03
PE19-07
service
Deployment Activity
Cocodrie, Louisiana
northern Gulf of Mexico, Louisiana 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.
Collaborative Research: Sediment Geochemical Control on Ocean Acidification and Carbon Budget in a River Dominated Shelf System
https://osprey.bco-dmo.org/project/815333
Collaborative Research: Sediment Geochemical Control on Ocean Acidification and Carbon Budget in a River Dominated Shelf System
<p><strong>NSF Award Abstract:</strong></p>
<p>In many coastal regions fertilizer washed down rivers leads to high production of algae. Consumption of organic material produced by the algae in deeper waters or in sediments consumes oxygen, leading to low-oxygen "dead zones" in many places like the northern Gulf of Mexico. This process of nutrient input, algal growth, and loss of oxygen is called eutrophication. Consumption of the organic matter also releases dissolved carbon dioxide into the water, and contributes directly and indirectly to ocean acidification. In order to understand and predict this impact on acidification, it is important to understand how much of the organic matter degradation occurs in the water column versus in the sediments, how variable it is between seasons and years, and how it is affected by processes such as storms that disturb the bottom sediments. In this project, investigators from three institutions along with their graduate and undergraduate students will conduct a combination of field observations and computer modeling to address these questions in the northern Gulf of Mexico. They will share their results with the public through local outreach activities, and with secondary school students in Louisiana through partnerships and curriculum development with local teachers.</p>
<p>The proposed research will use a combined observational and numerical modeling approach to better understand the role of shelf sediment in driving bottom water dissolved inorganic carbon (DIC) and pH dynamics and acidification at seasonal scales. Past and current studies have not addressed this mechanism. This current lack of knowledge makes it difficult to construct a comprehensive carbon budget for this region. The proposed research will (i) quantify the role of benthic fluxes in DIC production leading to acidification in the bottom water; (ii) determine the importance of the seasonally changing benthic DIC flux in acidifying the bottom water; and (iii) explore the importance of episodic resuspension events in modulating benthic fluxes of DIC. Seasonal sampling will be carried out in Louisiana shelf using state of the art benthic lander platform to record in situ sediment and bottom water oxygen consumption rates, organic matter remineralization rates, sediment oxygen penetration depths, benthic fluxes of DIC and accompanying pH drop. Bottom current velocities and turbidity will also be recorded in conjunction with sediment porewater and water column sampling. Complementing these detailed near-bed and seabed observations, we will utilize a recently developed coupled hydrodynamics, sediment transport and biogeochemistry model (HydroBioSed) to scale up observed estimates of benthic fluxes to an annual scale.</p>
<p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p>
<p><strong>Related Project note:</strong></p>
<p>There are overlapping cruises with the project "nGOMx acidification" <a href="https://www.bco-dmo.org/project/751332">https://www.bco-dmo.org/project/751332</a>. Thus, while all benthic data can be found under this project "Sed Control on OA", some water column data can be found under the "nGOMx acidification" project.</p>
Sed Control on OA
largerWorkCitation
project
eng; USA
biota
oceans
Cocodrie, Louisiana; northern Gulf of Mexico, Louisiana Shelf
-90.83
-90.1
28.14
29.02
2018-08-14
2019-07-20
Louisiana shelf, northern Gulf of Mexico shelf
0
BCO-DMO catalogue of parameters from Benthic fluxes collected in August 2018 and July 2019 in northern Gulf of Mexico shelf on R/V Pelican
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/945198.rdf
Name: Latitude
Units: decimal degrees
Description: <p>latitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/945199.rdf
Name: Longitude
Units: decimal degrees
Description: <p>longitude</p>
http://lod.bco-dmo.org/id/dataset-parameter/945200.rdf
Name: ISO_Date_UTC
Units: umitless
Description: <p>start date of incubation</p>
http://lod.bco-dmo.org/id/dataset-parameter/945201.rdf
Name: O2_flux
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>sediment oxygen flux</p>
http://lod.bco-dmo.org/id/dataset-parameter/945202.rdf
Name: DIC_flux
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>sediment dissolved inorganic carbon (DIC) flux</p>
http://lod.bco-dmo.org/id/dataset-parameter/945203.rdf
Name: TA_flux
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>sediment total alkalinity flux</p>
http://lod.bco-dmo.org/id/dataset-parameter/945204.rdf
Name: NO2_plus_NO3
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>sediment nitrite plus nitrate (NO2 + NO3) flux</p>
http://lod.bco-dmo.org/id/dataset-parameter/945205.rdf
Name: NH4_flux
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>sediment ammonium (NH4) flux</p>
http://lod.bco-dmo.org/id/dataset-parameter/945206.rdf
Name: PO4_flux
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>sediment phosphate (PO4) flux</p>
http://lod.bco-dmo.org/id/dataset-parameter/945207.rdf
Name: SiO4_flux
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>sediment silicate (SiO4) flux</p>
http://lod.bco-dmo.org/id/dataset-parameter/945208.rdf
Name: POC_percent
Units: percent (%)
Description: <p>average percent organic carbon of the top 10 centimeters of sediment</p>
http://lod.bco-dmo.org/id/dataset-parameter/945209.rdf
Name: OPD
Units: millimeters (mm)
Description: <p>oxygen penetration depth into the sediment</p>
http://lod.bco-dmo.org/id/dataset-parameter/945210.rdf
Name: TOU
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>total oxygen utilization</p>
http://lod.bco-dmo.org/id/dataset-parameter/945211.rdf
Name: DOU
Units: millimoles per square meter per day (mmol/m2/day)
Description: <p>diffusive oxygen utilization</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://osprey.bco-dmo.org/dataset/944947/data/download
download
onLine
dataset
<p>Benthic fluxes were measured&nbsp;along the northern Gulf of Mexico shelf during cruises aboard the R/V Pelican in August 2018 and July 2019.&nbsp; Sediment cores, incubation experiments, and in-situ measurements from a custom made benthic lander all provided data on&nbsp;benthic fluxes of nutrients, dissolved inorganic carbon (DIC), and total alkalinity (TALK) as well as estimates of total oxygen and diffusive oxygen utilization.&nbsp;</p>
<p>Intact sediment cores&nbsp;were collected in triplicate from ____ (** how many stations? **&nbsp; five stations each year?) each station using an Ocean Instruments MC800 multi-corer and utilized for benthic flux measurements through whole core incubation technique (** reference? **).&nbsp;Temperature-controlled recirculating water baths adjusted to&nbsp;the bottom water&nbsp;temperature were used for all incubation experiments. Filtered bottom water was used to&nbsp;gradually fill up the core tube with minimum disturbance to the sediment-water interface. The&nbsp;overlying water column height was adjusted to 25 cm from the sediment surface to&nbsp;&nbsp;ensure similar water column volume among all cores using custom PVC core caps. Care was&nbsp;taken to avoid any visible air bubbles or headspace. The custom designed lids are fitted with two&nbsp;O-rings for gas-tight incubations, and include one tube attachment for the corresponding water&nbsp;reservoir, one tube attachment for sample extraction, and two tube attachments that connect to&nbsp;each other in a peristaltic pump, allowing continuous flow and circulation in the core for the&nbsp;entire duration of the incubation. Sediment cores were&nbsp;fully submerged into the temperature-controlled water bath, and reservoir tanks along with the&nbsp;incubation water bath were covered with an opaque shroud to ensure no primary production.&nbsp;</p>
<p>A custom benthic lander system was deployed with minimum sediment disturbance at each of&nbsp; the stations to carry out in situ flux measurements for total oxygen utilization (TOU). The lander system was&nbsp; equipped with chambers that each seal a sediment surface area of 840 square centimeters and a volume of&nbsp; approximately 16 liters. Each chamber included a magnetically coupled stirrer that mixed the&nbsp; water within the chamber uniformly in about 20 minutes at 12-16 rpm and produced a 300-400 μm diffusive boundary layer. Leakage was calculated from the loss of a CsBr tracer from samples taken from each chamber every 4 hours. Three of the benthic chambers were fitted with Seaguard dissolved oxygen (DO)&nbsp; optode sensors that directly measured DO every 15 minutes for the duration of the 22&nbsp; hour deployment.</p>
<p>Sediment oxygen penetration depth (OPD) was measured with a Unisense in situ 130 microprofiler system, which was equipped with two oxygen sensors (250 μm) and a&nbsp;resistivity sensor. The position of the sediment-water interface (SWI) was determined relative to the in situ oxygen profiles using a modified version of the technique of Sweerts 133 et al.&nbsp; (** ? what is this reference?**)&nbsp;(Revsbech 1989; Sweerts et al. 1989; Rabouille et al. 2003). Diffusive&nbsp;oxygen utilization (DOU) was calculated with Cai and Sayles’s adaptation of Fick’s law of diffusion using the oxygen gradient in coastal sediments.</p>
<p>Measurement details:</p>
<ul>
<li>DIC was measured with an Apollo SciTech DIC multisample analyzer (AS-C6L) with a laser-based CO2 detector.&nbsp;Certified reference material from batch 180 provided by Dr. Andrew Dickinson was used for calibration for DIC and TA measurements.</li>
<li>TA was measured with an Apollo SciTech Total Alkalinity titrator (AS-ALK2). Certified reference material from batch 180 provided by Dr. Andrew Dickinson was used for calibration for DIC and TA measurements.</li>
<li>NO2+NO3 was measured using EPA method 353.4</li>
<li>NH4 was measured using EPA method 350.1</li>
<li>PO4 was measured using EPA method 365.1</li>
<li>SiO4 was measured using using the method described in Strickland and Parsons (1968).</li>
<li>Dissolved nutrinet analysis was caried out using a Seal Analytical Auto Analyzer.</li>
<li>Oxygen penetration depth (OPD) was measured in situ with a Unisense microprofiler and utilized to caluclate DOU.</li>
<li>TOU was measured using custom benthic lander system.</li>
</ul>
Specified by the Principal Investigator(s)
<p>Diffusive&nbsp;oxygen utilization (DOU) was calculated with Cai and Sayles’s adaptation of Fick’s law of diffusion using the oxygen gradient in coastal sediments.</p>
<p>(** need more information here on how this was done and what the gradient was **)</p>
Specified by the Principal Investigator(s)
- Converted date format from m/d/yy to yyyy-mm-dd (ISO Date 8601 format)
- Modified parameter (column) names to conform with BCO-DMO naming conventions. The only allowed characters are A-Z,a-z,0-9, and underscores. No spaces, hyphens, commas,
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
Apollo SciTech Total Alkalinity titrator (AS-ALK2)
Apollo SciTech Total Alkalinity titrator (AS-ALK2)
PI Supplied Instrument Name: Apollo SciTech Total Alkalinity titrator (AS-ALK2) PI Supplied Instrument Description:Total Alkalinity (TA) was measured with an Apollo SciTech Total Alkalinity titrator (AS-ALK2). Instrument Name: Apollo SciTech AS-ALK2 total alkalinity titrator Instrument Short Name:Apollo SciTech AS-ALK2 Instrument Description: An automated acid-base titrator for use in aquatic carbon dioxide parameter analysis. The titrator provides standardisation and sample analysis, using the Gran titration procedure for alkalinity determination of seawater and brackish waters. It is designed for both shipboard and land based laboratory use. The precision of the instrument is 0.1 percent or higher, and sample volumes may range from 10-25 ml. Titration takes approximately 8 minutes per sample, and the repeatability is within plus or minus 1-2 micromoles per kg.
Apollo SciTech DIC multisample analyzer (AS-C6L) with a laser-based CO2 detector.
Apollo SciTech DIC multisample analyzer (AS-C6L) with a laser-based CO2 detector.
PI Supplied Instrument Name: Apollo SciTech DIC multisample analyzer (AS-C6L) with a laser-based CO2 detector. PI Supplied Instrument Description:Dissolved inorganic carbon (DIC) was measured with an Apollo SciTech DIC multisample analyzer (AS-C6L) with a laser-based CO2 detector. Instrument Name: Apollo SciTech AS-C6L Dissolved Inorganic Carbon (DIC) analyzer Instrument Short Name: Instrument Description: An instrument designed for the analysis of dissolved inorganic carbon in samples from various aquatic environments. It comprises of a laser-based CO2 detector (LI-7815), a digital syringe pump, a mass flow controller, CO2 stripping reactor, an electronic cooling system and a computer communication assembly (RS-485, USB). The AS-C6L supersedes the earlier AS-C3 model, which used non-dispersive infra-red CO2 detection (LI-7000, discontinued). The AS-C6L improves on the AS-C3 by incorporating a multi-sampler of one set of standards plus 8 samples, and uses improved Apollo SciTech software. The AS-C6L is suitable for use in either shipboard or land-based laboratories. It maintains a precision of +/-0.1 % for seawater (or +/-2 umol/kg), enables sample volumes ranging from 0.5 - 3.5 ml per analysis, and an analytical rate of approximately 3 minutes.
custom benthic lander system
custom benthic lander system
PI Supplied Instrument Name: custom benthic lander system PI Supplied Instrument Description:A custom benthic lander system was deployed at each of the stations to carry out in situ flux measurements for total oxygen utilization (TOU). Instrument Name: benthic lander Instrument Short Name: Instrument Description: A benthic lander is an autonomous research platform used in marine research to take measurements directly on the seafloor. Benthic landers are carrier systems to which different measuring and sampling devices can be attached. They transport these devices to the seafloor and back up again. Autonomous means that the lander is not connected to the ship via a cable. It can thus work independently on the seafloor for a long period of time.
Temperature-controlled recirculating water bath
Temperature-controlled recirculating water bath
PI Supplied Instrument Name: Temperature-controlled recirculating water bath PI Supplied Instrument Description:Temperature-controlled recirculating water baths adjusted to the bottom water temperature were used for all incubation experiments. Instrument Name: circulating water bath Instrument Short Name: Instrument Description: A device designed to regulate the temperature of a vessel by bathing it in water held at the desired temperature. [Definition Source: NCI]
Seal Analytical Auto Analyzer
Seal Analytical Auto Analyzer
PI Supplied Instrument Name: Seal Analytical Auto Analyzer PI Supplied Instrument Description:Dissolved nutrient analysis was carried out using a Seal Analytical Auto Analyzer. Instrument Name: Nutrient Autoanalyzer Instrument Short Name:Nutrient Autoanalyzer Instrument Description: Nutrient Autoanalyzer is a generic term used when specific type, make and model were not specified. In general, a Nutrient Autoanalyzer is an automated flow-thru system for doing nutrient analysis (nitrate, ammonium, orthophosphate, and silicate) on seawater samples. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB04/
Ocean Instruments MC800 multi-corer
Ocean Instruments MC800 multi-corer
PI Supplied Instrument Name: Ocean Instruments MC800 multi-corer PI Supplied Instrument Description:Intact sediment cores were collected in triplicate from each station using an Ocean Instruments MC800 multi-corer and utilized for benthic flux measurements through whole core incubation technique. Instrument Name: Ocean Instruments MC-800 Multi corer Instrument Short Name:MC-800 Multi Corer Instrument Description: A multi-corer with a series of cores attached to one deployment frame. This model carries eight sample tubes. This is the largest corer in the MC series and is used primarily at deep ocean depths. It is designed to recover undisturbed surface sediments and are therefore well-suited to study benthic processes. This device can be used to study local fauna variations, geochemistry, and is ideal for sediment/water interface studies. The multi-corer is disposed on a research vessel and is lowered into the water body by a cable. When the multi-corer touches the sediment the units ballast weight pushes the assembled cores into the substrate. Each of the tubes contains a unique sediment core. The multi-corer uses a unique hydrostatic damping system that slows the penetration rate down to approximately 1 cm/s. It has a specially designed flow-through sample tube to reduce corer 'bow wake' effect, a double door sealing feature, double guide slides, special slow-down cylinder for smooth corer penetration, adjustable penetration limit stops, and pre-trip safety pin. The overall sample tube length is 70 cm, with an effective penetration of greater than 45 cm. The tube diameter is 10 cm.
Seaguard dissolved oxygen (DO) optode sensors
Seaguard dissolved oxygen (DO) optode sensors
PI Supplied Instrument Name: Seaguard dissolved oxygen (DO) optode sensors PI Supplied Instrument Description:Seaguard dissolved oxygen (DO) optode sensors were used to directly measure DO every 15 minutes for the duration of the deployment Instrument Name: Optode Instrument Short Name: Instrument Description: An optode or optrode is an optical sensor device that optically measures a specific substance usually with the aid of a chemical transducer.
Unisense microprofiler
Unisense microprofiler
PI Supplied Instrument Name: Unisense microprofiler PI Supplied Instrument Description:Oxygen penetration depth (OPD) was measured in situ with a Unisense microprofiler and utilized to calculate diffusive oxygen utilization. Instrument Name: Unisense oxygen microsensor Instrument Short Name:Unisense O2 Instrument Description: The Unisence oxygen microsensor is a miniaturized Clark-type dissolved oxygen instrument, including glass micro-sensors with minute tips (diameters ranging from 1 to 800 um). A gold sensing cathode is polarized against an internal reference and, driven by external partial pressure, oxygen from the environment penetrates through the sensor tip membrane and is reduced at the sensing cathode surface. A picoammeter converts the resulting reduction current to a signal. The sensor also includes a polarized guard cathode, which scavenges oxygen in the electrolyte, thus minimizing zero-current and pre-polarization time. See more on the manufacturer's website: https://www.unisense.com/
Cruise: PE20-03
PE20-03
R/V Pelican
Community Standard Description
International Council for the Exploration of the Sea
R/V Pelican
vessel
PE20-03
Kanchan Maiti
Louisiana State University
Cruise: PE19-07
PE19-07
R/V Pelican
Community Standard Description
International Council for the Exploration of the Sea
R/V Pelican
vessel
PE19-07
Kanchan Maiti
Louisiana State University
R/V Pelican
Community Standard Description
International Council for the Exploration of the Sea
R/V Pelican
vessel