Dataset: IRS_sedtrapflux
Deployment: ZHNG09RR

IRS sediment trap fluxes

Principal Investigator:

Tom W. Trull (Antarctic Climate and Ecosystems Cooperative Research Centre, ACE CRC)

Co-Principal Investigator:

Stephen Bray (Antarctic Climate and Ecosystems Cooperative Research Centre, ACE CRC)

BCO-DMO Data Manager:

Cynthia L. Chandler (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

VERtical Transport In the Global Ocean (VERTIGO)

Current State:

Final no updates expected

Version:

25 November 2008

Deployment Synonyms:

RR_K2

Version Date:

2008-11-25

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/451604/data

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Description

IRS sediment trap fluxes

Methods & Sampling

Dataset acquisition description

(see platform deployments)

Deployment-specific acquisition description

 Methodology: Methodology

 Change history: YYMMDD
    080709: contributed by Tom Trull
    081110: added to OCB database; Steve Gegg (sgegg@whoi.edu), BCO DMO
    081125: date, event, ev_code, lat, lon added from cruise event log
            (ev_code: Trull-Trap_I   = cruise-deployment: K2-1)
            (ev_code: Trull-Trap_2_I = cruise-deployment: K2-2)
             RR_K2 event log
    090209: minor edits to some parameter names to conform to OCB convention

Data Processing Description

Dataset Processing Description

(see platform deployments)

More information about this dataset deployment

Instruments

Sediment Trap - IRS

Supplied Name: IRS Sediment Trap

Supplied Description:

Instrument Type

Generic Name: Sediment Trap - IRS

Acronym: Sed Trap - IRS

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. The Indented Rotating Sphere (IRS) Sediment Trap is described in Peterson et al. (Field evaluation of a valved sediment trap. 1993. Limnology and Oceanography, 38, pp. 1741-1761 and Novel techniques for collection of sinking particles in the ocean and determining their settling rates. 2005. Limnology and Oceanography Methods 3, pp. 520-532). The IRS trap consists of four cylindrical modules; a particle interceptor, an IRS valve; a skewed funnel, and an eleven sample carousel (designated IRSC trap). The key to the trap design is the patented IRS valve located between the particle interceptor and particle accumulator portions of the trap. The valve and carousel are regulated by a TattleTale IVA (manufactured by Onset Computer Corp.) microprocessor and custom software. The IRS sediment trap was specifically designed to exclude zooplankton (Trull et al. 2008. Deep-Sea Research II v.55 pp. 1684-1695).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
date	date sampling began (GMT)	YYYYMMDD	date
event	unique sampling event	dimensionless	event
ev_code	event code from cruise log	alphanumeric	no_bcodmo_term
lon	longitude, negative denotes West	decimal degs	lon
lat	latitude, negative denotes South	decimal degs	lat
cruise_deployment	cruise and tether deployment number	text	no_bcodmo_term
cup	IRS cup number	dimensionless	cup
sinking_rate_fraction	cup 1 has >820 m/d, cup 2 has 410 to 820 m/day etc	m per day	no_bcodmo_term
cup_duration_per_cycle	time each cup is under funnel, each cycle of ball valve	minutes	no_bcodmo_term
PC_flux_tot_per_cup	total particulate carbon flux	umol/m2/day	no_bcodmo_term
PIC_flux_per_cup	particulate inorganic carbon flux	umol/m2/day	no_bcodmo_term
PC_flux_per_cup	particulate carbon (calculated by difference PC-PIC) flux	umol/m2/day	no_bcodmo_term
PN_flux_per_cup	particulate nitrogen flux	umol/m2/day	no_bcodmo_term
Bsi_flux_per_cup	biogenic silica flux	umol/m2/day	no_bcodmo_term
PC_flux_per_cup_duration	flux normalized to cup duration (as the longer a cup is open the more it can collect)	umol/m2/day/min	no_bcodmo_term
POC_K2_1_swimmers	K2-1 POC contents of zooplankton removed from the samples and analysed separately	umol/m2/day	no_bcodmo_term
PC_flux_fraction	% PC in cup of total POC in trap	percent	no_bcodmo_term
PC_flux_cumulative_fraction	% PC in cup and all preceding cups of total POC in trap	percent	no_bcodmo_term
POC_to_PN	molar ratio	dimensionless ratio	no_bcodmo_term
PO_to_PIC	molar ratio (=mass ratio as have carbon/carbon)	dimensionless ratio	no_bcodmo_term
PC_to_POC	molar ratio	dimensionless ratio	no_bcodmo_term
PC_to_BSi	molar ratio bd indicates below detectable limit or bad data	dimensionless ratio	no_bcodmo_term

Database

Contribute Data

Dataset: IRS_sedtrapflux
Deployment: ZHNG09RR

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: IRS_sedtrapfluxDeployment: ZHNG09RR

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Dataset: IRS_sedtrapflux
Deployment: ZHNG09RR