Dataset: Indian Ocean Sediment Traps

Name: Indian Ocean Sediment Trap Data collected from R/V Roger Revelle Cruise RR2201 in the Eastern Indian Ocean (Argo Basin) during February 2022 (BLOOFINZ-IO project)
Published: 2024-12-03
Keywords: biological carbon pump, Carbon Export, sinking particles, oceans

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Spatial Extent: N:-15.34 E:118.14 S:-16.91 W:114.19

Argo Basin, Indian Ocean

Temporal Extent: 2022-02-03 - 2022-02-24

Project:

Collaborative Research: Mesoscale variability in nitrogen sources and food-web dynamics supporting larval southern bluefin tuna in the eastern Indian Ocean (BLOOFINZ-IO)

Program:

Second International Indian Ocean Expedition (IIOE-2)

Co-Principal Investigator:

Michael R. Stukel (Florida State University, FSU)

BCO-DMO Data Manager:

Sawyer Newman (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2024-12-03

Restricted:

Validated:

Current State:

Preliminary and in progress

Indian Ocean Sediment Trap Data collected from R/V Roger Revelle Cruise RR2201 in the Eastern Indian Ocean (Argo Basin) during February 2022 (BLOOFINZ-IO project)

Abstract:

The dataset contains sediment trap data collected from the R/V Roger Revelle during cruise RR2201 in the Eastern Indian Ocean (Argo Basin) from February 2022. The data, part of the BLOOFINZ-IO project, includes measurements of particulate organic carbon, nitrogen flux, carbon and nitrogen isotopes, chlorophyll a, and phaeopigment flux. The sediment traps were deployed using VERTEX-style surface-tethered systems, with samples processed for isotope analysis and other biochemical analyses.

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Description

The temporal bounds of this dataset represent the date when the sediment traps were initially deployed, through the last recovery date. The geospatial bounds also encompass the coordinates of trap all deployments and recoveries.

Methods & Sampling

Data comes from VERTEX-style, surface-tethered, drifting sediment trap deployments. Particle interceptor tubes were deployed on cross-pieces with 8 tubes attached. Tubes were deployed with a dense formaldehyde brine created by adding NaCl and formaldehyde to filtered seawater. After recovery, overlying seawater was removed from each cruise by gentle suction. Tubes were then gravity filtered through a 100-micron nitex mesh filter, and the 100-micron filters were carefully analyzed under a stereomicroscope and all metazoan zooplankton “swimmers” were removed from the sample. Material remaining on the 100-micron filters (i.e., sinking material) was then imaged with a macrophotography rig and subsequently rinsed back into the original sample tube (i.e., re-combined with the <100-micron sinking material). Samples were then separated and filtered onto different types of filters for a suite of different analyses including: particulate organic carbon flux, particulate nitrogen flux, carbon and nitrogen isotopes, and chlorophyll a and phaeopigment flux.

Samples for particulate organic carbon flux were vacuum filtered through pre-combusted GF/F filters at low pressure. Samples were then frozen at -80C and stored for the duration of the cruise. These were then dried out for shipping. On land, they were acidified by fuming with hydrochloric acid (HCI). Samples were then thoroughly dried and packed into pre-combusted tin cups. They were analyzed by isotope ratio mass spectrometer at the UC Davis Stable Isotope Facility for carbon, nitrogen, carbon isotopes, and nitrogen isotopes.

Samples for Chl a and phaeopigments were filtered onto GF/F filters, extracted in acetone, and analyzed by the acidification method using a Turner 10-AU fluorometer.

BCO-DMO Processing

- Units removed from the primary data file (originally units were included in row 2).
- Special characters removed from parameter names and replaced with more interoperable character equivalents (spaces were replaced with underscores ("_") and "σ" were replaced with "sigma").
- Datetime formats associated with trap deployments and recoveries were converted from %m/%d/%y %H:%M to %Y-%m-%d %H:%M.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1851347

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR2201	BLOOFINZ-IO	2022-01-20	R/V Roger Revelle	Michael R. Landry (Chief Scientist)	data info

Instruments

Camera

Supplied Name: Macrophotography Rig

Supplied Description:

After all metazoan zooplankton "swimmers" were removed from the filtered sample, the material remaining on the 100-micron filters (i.e., sinking material) was then imaged with a macrophotography rig and subsequently rinsed back into the original sample tube (i.e., re-combined with the <100-micron sinking material).

Instrument Type

Generic Name: Camera

Acronym: camera

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/311/

Generic Description:

All types of photographic equipment including stills, video, film and digital systems.

Fluorometer

Supplied Name: Turner 10-AU Fluorometer

Supplied Description:

Processed samples for Chl a and phaeopigments were filtered onto GF/F filters, extracted in acetone, and analyzed via the acidification method using a Turner 10-AU fluorometer.

Instrument Type

Generic Name: Fluorometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic Description:

A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.

Isotope-ratio Mass Spectrometer

Supplied Name: Isotope Ratio Mass Spectrometer

Supplied Description:

Samples were analyzed by isotope ratio mass spectrometer at the UC Davis Stable Isotope Facility for carbon, nitrogen, carbon isotopes, and nitrogen isotopes.

Instrument Type

Generic Name: Isotope-ratio Mass Spectrometer

Acronym: IR Mass Spec; IRMS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/

Generic Description:

The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).

Microscope - Optical

Supplied Name: Stereomicroscope

Supplied Description:

After gravity filtering tube contents through 100-micron nitex mesh filters, these filters were carefully analyzed under a stereomicroscope and all metazoan zooplankton “swimmers” were removed from the sample.

Instrument Type

Generic Name: Microscope - Optical

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB05/

Generic Description:

Instruments that generate enlarged images of samples using the phenomena of reflection and absorption of visible light. Includes conventional and inverted instruments. Also called a "light microscope".

Sediment Trap

Supplied Name: VERTEX-style Drifting Sediment Traps

Supplied Description:

Instrument Type

Generic Name: Sediment Trap

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/33/

Generic Description:

Sediment traps are specially designed containers deployed in the water column for periods of time to collect particles from the water column falling toward the sea floor. In general a sediment trap has a jar at the bottom to collect the sample and a broad funnel-shaped opening at the top with baffles to keep out very large objects and help prevent the funnel from clogging. This designation is used when the specific type of sediment trap was not specified by the contributing investigator.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Name of cruise associated with the trap deployment.	unitless	cruise_name
Cycle	Lagrangrian experiment number.	unitless	exp_id
Depth	Depth of trap deployment.	meters (m)	depth
Date_Deployed	Datetime of trap deployment (local). Format: %Y-%m-%d %H:%M	unitless	DateTime
Date_Recovered	Datetime of trap recovery (local). Format: %Y-%m-%d %H:%M	unitless	DateTime
Duration	Duration of deployment.	days	duration
Deployment_Latitude	Latitude of trap deployment in decimal degrees; a negative value indicates a Southern coordinate.	decimal degrees	lat
Deployment_Longitude	Longitude of trap deployment in decimal degrees; a positive value indicates an Eastern coordinate.	decimal degrees	lon
Recovery_Latitude	Latitude of trap recovery in decimal degrees; a negative value indicates a Southern coordinate.	decimal degrees	lat
Recovery_Longitude	Longitude of trap recovery in decimal degrees; a positive value indicates an Eastern coordinate.	decimal degrees	lon
Corg	Particulate organic carbon flux.	mg C m-2 d-1	flux_POC_mass
sigma_Corg	Standard deviation of Corg flux.	mg C m-2 d-1	flux_POC_mass
Norg	Particulate nitrogen flux.	mg N m-2 d-1	flux_N_mass
sigma_Norg	Standard deviation of N flux.	mg N m-2 d-1	flux_N_mass
d13C	Delta 13C of sinking particles.	units	d13C
sigma_d13C	Standard deviation of delta 13C.	units	d13C
d15N	Delta 15N of sinking particles.	units	d15N
sigma_d15N	Standard deviation of _15N.	units	d15N
Chl	Chlorophyll flux.	mg Chl a m-2 d-1	chl_a_f_mol
sigma_Chl	Standard deviation of chl flux.	mg Chl a m-2 d-1	chl_a_f_mol
Phaeo	Phaeopigment Flux.	mg Chl a equivalents m-2 d-1	flux
sigma_Phaeo	standard deviation of Phaeo flux mg Chl a equivalents.	m-2 d-1	flux

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Dataset: Indian Ocean Sediment Traps