Dataset: HADES-K CN and d13C signatures
Deployment: TN309

HADES-K CN and d13C

View Data: For data, See Dataset Metadata Page: https://osprey.bco-dmo.org/dataset/764208

Principal Investigator:

Timothy M. Shank (Woods Hole Oceanographic Institution, WHOI)

Co-Principal Investigator:

Jeffrey C. Drazen (University of Hawaiʻi at Mānoa, SOEST)

Paul Yancey (Whitman College)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Controls on Hadal Megafaunal Community Structure: a Systematic Examination of Pressure, Food Supply, and Topography (HADES)

Version:

Deployment Synonyms:

HADES-K, HADESK

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Description

This dataset includes C and N concentrations, C:N ratios, and d13C bacterial biomass signatures in Kermadec Trench near New Zealand from sediment push cores collected on R/V Thomas G. Thompson cruise TN309, May 2014.

Data not yet submitted.

Methods & Sampling

Dataset acquisition description

Push cores (6.35 cm diameter) of sediment were collected in situ using the manipulator arm of the Hybrid Remotely Operated Vehicle Nereus on the margin of the Kermadec Trench (6013m) and along the main trench axis (7137 to 9177m) at roughly 1000m increments.

Cores were sectioned at 1cm intervals and sieved for the meiofaunal fraction.

Upon retrieval of sediment cores, the 0-1, 1-2, 2-3, 3-5, 5-10 cm depth horizons were sectioned and stored frozen (-80 °C) until analysis. Food availability, described as the bulk quantities of organic carbon and nitrogen and benthic bacterial biomass, were determined from freeze dried and decalcified sediment samples with a Fisons NA 1500 elemental analyzer using sulphanillic acid as a standard.

Attempts were made to obtain 3 replicate cores at each depth horizon (every 1000 meters from 6000m to 10,000m. For logistical reasons with vehicle performance (and loss at 10,000), all of the replicates were not able to be collected.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing Notes:

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1131620	NSF Division of Ocean Sciences

Instruments

Elemental Analyzer

Supplied Name: Fisons NA 1500 elemental analyzer

Supplied Description:

Instrument Type

Generic Name: Elemental Analyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB01/

Generic 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.

HROV Nereus

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: HROV Nereus

Generic Description:

Nereus is an efficient, multi-purpose “hybrid” vehicle that can explore and operate in the crushing pressures of the greatest ocean depths. An unmanned vehicle, Nereus operates in two complementary modes. It can swim freely as an autonomous underwater vehicle (AUV) to survey large areas of the depths, map the seafloor, and give scientists a broad overview. When Nereus locates something interesting, the vehicle’s support team can bring the vehicle back on board the ship and transforms it into a remotely operated vehicle (ROV) tethered to the ship via a micro-thin, fiber-optic cable. Through this tether, Nereus can transmit high-quality, real-time video images and receive commands from skilled pilots on the ship to collect samples or conduct experiments with a manipulator arm.

Technical specifications:

Weight on land: 2,800 kg
Payload capacity: 25 kg
Maximum speed: 3 knots
Batteries: rechargable lithium ion, 15 kilowatt hours in two pressure housings
Thrusters: 2 fore and aft, 2 vertical, 1 lateral (ROV mode) 2 fore and aft, 1 vertical (AUV mode)
Lights: variable output LED array, strobes
Manipulator arm: Kraft TeleRobotics 7-function hydraulic manipulator
Sonar: scanning sonar, forward look and profile, 675 KHz
Sensors: magnetometer, CTD (to measure conductivity, temperature, and depth)

Nereus supports a variety of science operations: Push coring, measuring heat flow, geotechnical and geochemical sensing, rock sampling and drilling, biological sampling, water sampling, high resolution acoustic bathymetry, and optical still and video imagery.

More information is available from the operator site at URL.

Push Corer

Supplied Name:

Supplied Description:

Push cores were borrowed from the National Deep Submergence Facility to be able to standardize results. The push cores were 6.35cm diameter).

Instrument Type

Generic Name: Push Corer

Generic Description:

Capable of being performed in numerous environments, push coring is just as it sounds. Push coring is simply pushing the core barrel (often an aluminum or polycarbonate tube) into the sediment by hand. A push core is useful in that it causes very little disturbance to the more delicate upper layers of a sub-aqueous sediment.

Description obtained from: http://web.whoi.edu/coastal-group/about/how-we-work/field-methods/coring/

Parameters

None available yet

Database

Contribute Data

Dataset: HADES-K CN and d13C signatures
Deployment: TN309

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: HADES-K CN and d13C signaturesDeployment: TN309

Dataset acquisition description

Dataset Processing Description

Dataset: HADES-K CN and d13C signatures
Deployment: TN309