Dataset: GoMX_PIT_Oceanus_8-2010

Name: GoMX PIT from R/V Oceanus cruise OC468-02 in the Gulf of Mexico in 2010 (GoMX - DHOS Marine Snow and Sedimentation project)
Published: 2011-04-11
Keywords: oceans

Cite This Dataset

Spatial Extent: N:28.86731 E:-87.2167 S:27.3752 W:-90.5595

Temporal Extent: 2010-08-24 - 2010-09-14

Project:

Deepwater Horizon Oil Spill, Marine Snow and Sedimentation (GoMX - DHOS Marine Snow and Sedimentation)

Program:

Gulf of Mexico - Deepwater Horizon Oil Spill (GoMX - DHOS)

Principal Investigator:

Uta Passow (University of California-Santa Barbara, UCSB-MSI)

Co-Principal Investigator:

Vernon L. Asper (University of Southern Mississippi, USM)

Arne R. Diercks (University of Southern Mississippi, USM)

Contact:

Uta Passow (University of California-Santa Barbara, UCSB-MSI)

BCO-DMO Data Manager:

Stephen R. Gegg (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

11 April 2011

Version Date:

2011-04-11

Restricted:

Validated:

Yes

Current State:

Final no updates expected

GoMX PIT from R/V Oceanus cruise OC468-02 in the Gulf of Mexico in 2010 (GoMX - DHOS Marine Snow and Sedimentation project)

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Description

Results from floating particle interceptor traps (PIT) deployed August/ September for about 36 hours each at 8 stations in the Gulf of Mexico at 150 or 180 m

Note: These data are restricted. Contact PI for access information.

Methods & Sampling

GoMX Aug/ Sep 2010: PIT traps
Methods
Eight (PIT 1 & 2, 7, & 8) to twelve (PIT 3, 4, 5, 6) columns were attached to a cross (2-3 in each of 4 directions) attached 30 m above the weight. Above the column a bungee cord connection that buffered the wave action connected to two large benthos floats and a bead of a series of small floats with a buoy at the surface. The traps, which were suspended at 150 m depth (PIT 1 to 6) or 185 m (PIT > 6) and drifted freely, were deployed at the beginning of each main station and recovered at the end. Deployment time varied around 36 hours, except PIT 7 where it was 24 h. Each trap column was 62.5 cm high, with baffles in the 9 top cm and a diameter of 6.96 cm (area 37.94 cm²).

Gels in jars fitting tightly into the columns were added at the bottom of two columns to investigate size distribution and type of sinking particles. Prior to deployment the cup with the softened gel (softened by adding a layer of 50 ‰ FSW ≥ 2 days before deployment) was fitted into the bottom of the column and overlaid first with a layer of salt-enriched water and then with FSW. The other 6 to 10 columns were filled with FSW which was under laid with 300 mL of salt-enriched water using a tube connected to a sawed off pipette.

Upon retrieval, water was drained above the gel cups, the cups removed and stored in the fridge. The upper 2/3 of the water in the other columns was also drained after particles wee allowed to settle and the lower third of all columns mixed and used for subsequent analysis of POC, PON, Isotopes. DNA content and oil signature is analyzed for selected samples only.

Data Processing Description

Counts: particles were counted in a dissecting scope, abundance calculated.
DW: Subsample was filtered onto pre-weight filter (PC) and filters reweight after drying for 2 h at 60ºC.

BCO-DMO Processing Notes
Generated from original spreadsheet file "GOM_PIT_gelcounts-_BCODMO.xls" contributed by Uta Passow

BCO-DMO Edits
- Parameter names modified to conform to BCO-DMO convention
- Lat/Lons added from spreadsheet: "GPS_PIT_Positions.xls" contributed by Uta Passow
- Data re-organized from columns into rows by PIT station

Data Files

File
PITs.csv (Comma Separated Values (.csv), 1.34 KB) MD5:57e44b2420fd11f6ea10160853229547 Primary data file for dataset ID 3459

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1045330

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
OC468-02	GoM2010	2010-08-21	R/V Oceanus	Joseph Montoya (Chief Scientist)	data info

Instruments

Sediment Trap - Particle Interceptor

Supplied Description:

Instrument Type

Generic Name: Sediment Trap - Particle Interceptor

Acronym: Sed Trap - Part Int

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

Generic Description:

A Particle Interceptor Trap is a prototype sediment trap designed in the mid 1990s to segregate 'swimmers' from sinking particulate material sampled from the water column. The prototype trap used 'segregation plates' to deflect and segregate 'swimmers' while a series of funnels collected sinking particles in a chamber (see Dennis A. Hansell and Jan A. Newton. September 1994. Design and Evaluation of a "Swimmer"-Segregating Particle Interceptor Trap, Limnology and Oceanography, Vol. 39, No. 6, pp. 1487-1495).

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Station_Id	Trap Station Id	text	no_bcodmo_term
date	Trap deployment date	yyyymmdd	date
time	Trap deployment time	hhmm	time
lat_deploy	Trap deployment latitude (South is negative)	decimal degrees	lat_begin
lon_deploy	Trap deployment longitude (West is negative)	decimal degrees	lon_begin
lat_recover	Trap recovery latitude (South is negative)	decimal degrees	lat_end
lon_recover	Trap recovery longitude (West is negative)	decimal degrees	lon_end
Aggregates_0point06mm	Sedimentation rate – Aggregates 0.06mm	# per m^2 per day	no_bcodmo_term
Aggregates_0point12mm	Sedimentation rate - Aggregates 0.12mm	# per m^2 per day	no_bcodmo_term
Aggregates_0point24mm	Sedimentation rate - Aggregates 0.24mm	# per m^2 per day	no_bcodmo_term
Aggregates_gt_0point32mm	Sedimentation rate - Aggregates .gt. 0.32mm	# per m^2 per day	no_bcodmo_term
zooplankton	Sedimentation rate – Zooplankton	# per m^2 per day	no_bcodmo_term
fecal_pellets_total	Sedimentation rate - Fecal pellets total	# per m^2 per day	no_bcodmo_term
fecal_pellets_lt_0point1mm	Sedimentation rate - Fecal pellets .lt. 0.1mm	# per m^2 per day	no_bcodmo_term
fecal_pellets_0point15mm	Sedimentation rate - Fecal pellets 0.15mm	# per m^2 per day	no_bcodmo_term
phytoplankton	Sedimentation rate - Phytoplankton	# per m^2 per day	no_bcodmo_term
detritus	Sedimentation rate - Detritus	# per m^2 per day	no_bcodmo_term
u_p_o_s	Sedimentation rate - u.p.o.'s	# per m^2 per day	no_bcodmo_term
sand_minerals	Sedimentation rate - Sand Minerals	# per m^2 per day	no_bcodmo_term
DW	Dry Weights	g/m^2 /d	dry_wgt_globec

Status message

Database

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Dataset: GoMX_PIT_Oceanus_8-2010