Dataset: LVP_pump

Name: Carbon and nitrogen concentration from filtered in situ LVP pump samples from SOFeX cruises PS02_2002, COOK19MV from the Southern Ocean, south of New Zealand, Southern Ocean in 2002 (SOFeX project)
Published: 2007-05-04
Keywords: oceans

Cite This Dataset

Spatial Extent: N:-52.452 E:-166.942 S:-71.067 W:-179.517

Project:

Southern Ocean Iron Experiment (SOFeX)

Program:

Ocean Carbon and Biogeochemistry (OCB)

Iron Synthesis (FeSynth)

Principal Investigator:

Kenneth O. Buesseler (Woods Hole Oceanographic Institution, WHOI)

Contact:

Kenneth O. Buesseler (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

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

Version:

04 May 2007

Version Date:

2007-05-04

Validated:

Yes

Current State:

Final no updates expected

Carbon and nitrogen concentration from filtered in situ LVP pump samples from SOFeX cruises PS02_2002, COOK19MV from the Southern Ocean, south of New Zealand, Southern Ocean in 2002 (SOFeX project)

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Description

Carbon and Nitrogen concentration from filtered in situ LVP pump samples

Methodology:

href="http://ocb.whoi.edu/SOFeX/PI-NOTES/buesseler_etal_lo502005.pdf">Buesseler, et al. 2005

"Particle export during the Southern Ocean Iron Experiment (SOFeX)". Limnol.
Oceanogr., 50(1). American Society of Limnology and Oceanography, Inc. pp.311-327.
URI: href="http://hdl.handle.net/1912/908">http://hdl.handle.net/1912/908 This is the author's version of the work posted
here by permission of the publisher for personal use, not for redistribution.

These data are part of a multi-ship data set ( href="http://ocb.whoi.edu/jg/serv/OCB/SOFeX/multi-ship/LVP_pump.html0">see full data set).

Change history: YYMMDD

    070323: data contributed by Ken Buesseler as emailed Excel file 
    070418: added to OCB database by Cyndy Chandler, OCB DMO, (cchandler@whoi.edu) 
            LVP event, date, time, lon and lat agree with cruise event logs; 
            the patch_loc values are not identical to those in the cruise event logs
    070504: adjust parameter names for database consistency

PI and OCB DMO Notes: href="http://ocb.whoi.edu/SOFeX/PI-NOTES/LVP_Buesseler.html">processing notes

Methods & Sampling

SOFeX 2002 Melville and Polar Star cruises

DMO processing notes for in situ LVP data

PI: Ken Buesseler (WHOI)

18 April 2007: Prepared for OCB data system by Cyndy Chandler, OCB DMO (WHOI).

These data are from the filters from in-situ pumps (LVP)
operated by Ken Buesseler's group and used on both the Melville and Polar Star. These data have also been published in:

K. O. Buesseler, J. E. Andrews, S. Pike, M. A. Charette, L. E. Goldson, M. A. Brzezinski, and V. P. Lance, 2005.
"Particle export during the Southern Ocean Iron Experiment (SOFeX)".
Limnol. Oceanogr., 50(1). American Society of Limnology and Oceanography, Inc. pp.311-327.
(download PDF). The sampling and analysis methodology is also described in that publication.

Original Excel file received via email from PI:
copy of original Excel file

The 13C and 15N measurements were done by people in Mark Altabet's lab at UMass Dartmouth. Some notes from David Timothy (School for Marine Science and Technology
University of Massachusetts, Dartmouth, MA) accompanied the original Excel data file:

"These results are NOT blank subtracted! I don't think I included columns for
POC and PN per filter, but you'll see these can be calculated easily (volumes filtered are on the
spreadsheet). I won't be surprised if after blank subtraction there are negative values;
some of the > 54um samples had very low POM."

PI notes

The Buesseler lab "large volume pumps" used on the Melville and Polar Star were of similar design. These casts and data are also reported elsewhere in the OCB database. MULVFS, multiple unit large volume filtration system, another sampling device was only used on the Melville. The LVP's yield about 200-500L per sample, while MULVFS yield on order of 2000L or more. Also, MULVFS casts tend to go deeper, to 1000m, where as LVP samples concentrated on the upper 100-200m.

Contact: Ken Buesseler (WHOI)

Data Processing Description

DMO processing notes

Melville sampling dates: At some point the sampling dates for the Melville data were put into MS Excel on a Mac system. MS Excel on a Mac uses a different date system from Windows. On a Mac, serial day 1 = Jan 1, 1904 and on Windows, Excel serial day 1 = Jan 1, 1900, and 1900 is an exception to the 4 year leap year rule because it is divisible by 100. When the Excel data file was first ingested into the OCB database, the dates were all off by 4 years and 1 day. However, the actual Excel serial day of 37280.32292 that was entered in the original file is equivalent to Jan 24 2002 07:45:00 - notice the correct year and the time agrees with the event log GMT. The data were copied from the original file and pasted into a new MS Windows Excel file prior to ingestion into the database. This resulted in new sampling dates that matched the cruise's event log except as noted in the next section.

Also, after the date offset (Mac vs. Windows Excel) issue was resolved, the original datafile reported data from station 4 at 08:45 GMT on 25-Jan (according to the MV event log, station 4 was reportedly occupied on 29-Jan, but station 2 had a pump cast on 25-Jan at 08:43). Also, several rows of data were reported from station ? on 29-Jan. The DMO determined this to be station 4. Station 34 data were reported for 11-Feb, but according to the cruise event log, this station was actually done on 12-Feb. The LVP data file was adjusted accordingly to agree with the Melville cruise event log.

The 'patch_loc' field: The SOFeX 'patch_loc' field
is usually one of four abbreviation codes indicating the
sampling location relative to the 'iron fertilized patches'; N indicates North Patch,
S = South Patch, and whether the location is within or outside the patch area or on
the edge of the patch. For the Polar Star cruise, it appears that only the relative in/out
information was recorded. There were two fertilized patches, one north and one south of the
Antarctic Polar Front Zone (APFZ near 61°S) along 170°W. All of the Polar Star sampling events
for which patch_loc is recorded were conducted south of 61°S, implying the south patch.

Data Files

File
LVP_pump.csv (Comma Separated Values (.csv), 12.56 KB) MD5:add45f006993a9b054e1f04e4fe53c30 Primary data file for dataset ID 2817

More Information about this dataset

Funding Sources

Funding Source	Award Number
National Science Foundation	unknown SOFeX NSF

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
COOK19MV	SOFeX MV	2002-01-19	R/V Melville	Kenneth H. Coale (Chief Scientist)	data info
PS02_2002	PS_2002_SOFeX	2002-02-11	USCGC Polar Star	Kenneth O. Buesseler (Chief Scientist)	data info

Instruments

McLane Large Volume Pumping System WTS-LV

Supplied Name: Large Volume Pumping System

Supplied Description:

in situ pumping/filtration (battery-powered from McLane Labs) units were deployed at multiple depths per cast

Instrument Type

Generic Name: McLane Large Volume Pumping System WTS-LV

Acronym: WTS-LV

Generic Description:

The WTS-LV is a Water Transfer System (WTS) Large Volume (LV) pumping instrument designed and manufactured by McLane Research Labs (Falmouth, MA, USA). It is a large-volume, single-event sampler that collects suspended and dissolved particulate samples in situ.

Ambient water is drawn through a modular filter holder onto a 142-millimeter (mm) membrane without passing through the pump. The standard two-tier filter holder provides prefiltering and size fractioning. Collection targets include chlorophyll maximum, particulate trace metals, and phytoplankton. It features different flow rates and filter porosity to support a range of specimen collection. Sampling can be programmed to start at a scheduled time or begin with a countdown delay. It also features a dynamic pump speed algorithm that adjusts flow to protect the sample as material accumulates on the filter. Several pump options range from 0.5 to 30 liters per minute, with a max volume of 2,500 to 36,000 liters depending on the pump and battery pack used. The standard model is depth rated to 5,500 meters, with a deeper 7,000-meter option available. The operating temperature is -4 to 35 degrees Celsius.

The WTS-LV is available in four different configurations: Standard, Upright, Bore Hole, and Dual Filter Sampler. The high-capacity upright WTS-LV model provides three times the battery life of the standard model. The Bore-Hole WTS-LV is designed to fit through a narrow opening such as a 30-centimeter borehole. The dual filter WTS-LV features two vertical intake 142 mm filter holders to allow simultaneous filtering using two different porosities.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
ship_name	research ship name	dimensionless	no_bcodmo_term
patch_loc	sampling location relative to patch	dimensionless	no_bcodmo_term
event	event number from cruise event log Melville event is doYhhmm and Polar Star event is DDMMYY_hhmm	doYhhmm or DDMMYY_hhmm	event
date	date sampling began (UTC)	YYYYMMDD	date
time	time sampling began (UTC)	hhmm	time
yrday	day of year	doY	yrday
lon	longitude, negative denotes West	decimal degrees	lon
lat	latitude, negative denotes South	decimal degrees	lat
comments	notes regarding sampling	dimensionless	comment
station	station location number	dimensionless	station
depth	depth, calculated from pressure	meters	depth
sample_ID	sample identification	dimensionless	no_bcodmo_term
filter_size	filter size	micrometers	no_bcodmo_term
frac_anlyd	fraction of total volume analyzed	dimensionless	no_bcodmo_term
volume_filt	sample volume filtered	liters	no_bcodmo_term
PON	Particulate Organic Nitrogen	micromolar	PON_JG
POC	Particulate Organic Carbon	micromolar	POC_JG
C_to_N	Carbon to Nitrogen ratio	molar ratio	C_to_N
dN15_POM	delta 15N of particulate organic matter relative to atmospheric N2	per mil	dN15_POM
dC13_POM	delta 13C of particulate organic matter relative to the PDB standard	per mil	dC13_POM