Dataset: LB_2012_Ship_Nutrients
Deployment: SAV-12-05

Long Bay ship macronutrient concentrations: nitrate + nitrite, phosphate, silicate

Principal Investigator:

James Nelson (Skidaway Institute of Oceanography, SkIO)

Co-Principal Investigator:

Catherine Edwards (Skidaway Institute of Oceanography, SkIO)

Harvey E. Seim (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

Contact:

Charles Robertson (Skidaway Institute of Oceanography, SkIO)

BCO-DMO Data Manager:

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

Project:

Mechanisms of nutrient input at the shelf margin supporting persistent winter phytoplankton blooms downstream of the Charleston Bump (Long Bay Wintertime Bloom)

Current State:

Final no updates expected

Version:

2016-02-10

Deployment Synonyms:

LB 2012 Leg 2 Cruise

Version Date:

2016-02-10

Data URL:

https://www.bco-dmo.org/dataset-deployment/638167/data

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Description

Methods & Sampling

Dataset acquisition description

At selected stations and depths, Niskin water samples were collected using the ship’s CTD/carousel water sampler (Sea-Bird SBE 25 Sealogger CTD; Sea-Bird SBE 32C carousel pylon; 8-L Ocean Test Equipment Model 110 external-closure water sampling bottles). Samples were transferred to 2 L polycarbonate bottles from the Niskin bottles via Tycon tubing and processed in the ship’s wet lab. Samples for nutrients were filtered through 0.45 µm syringe filters into 100 mL acid-cleaned polyethylene screw cap bottles. Sample bottles were labelled with a numbered adhesive label and logged on a sample log sheet. Sample log sheet information was entered into a spreadsheet on a laptop. Samples bottles were frozen in the ship wet lab freezer (~ -20°C) and transferred to a shore lab freezer following the cruise.

For analyses, selected samples were shipped frozen to the MSI Analytical Lab at the Marine Science Institute of the University of California, Santa Barbara (http://msi.ucsb.edu/services/analytical-lab/instruments/flow-injection-analyzer). Analyses were conducted by Flow Injection Analysis (FIA) using a Lachat Instruments model QuickChem 8000. Analytical manifolds for Nitrate plus Nitrite, ortho-Phosphate and Silicate were employed. The analysis results were provided as a spreadsheet files (analysis date 12/14/2012). Standard checks used concentrations of 4 micromolar phosphate, 20 micromolar silicate, and 6 micromolar nitrate along with separate standards of 12 micromolar and 30 micromolr nitrate plus nitrite. Reported method detection limits were 0.10 micromolar for phosphate, 1.0 micromolar for silicate and 0.2 micromolar for nitrate plus nitrite. Sample concentrations below method detection limits were indicated in the data report.

Samples were collected from Long Bay, South Atlantic Bight, SE United States. The primary study area was 60 km in the cross-shelf extending from the middle continental shelf (~ 30 m isobath) to upper slope (~260 m) off Myrtle Beach, SC (between 33.17/-78.33 and 32.85/-78.00) and 60 km in the along-shelf.

Data Processing Description

Dataset Processing Description

Sample concentrations for phosphate, silicate and nitrate plus nitrite that were below the reported method detection limits are flagged in the submitted data file.

BCO-DMO Processing:

- added conventional header with dataset name, PI name, version date
- renamed parameters to BCO-DMO standard
- changed ~ to nr_ ('near')
- changed blank flag cells to '-'

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1032276	NSF Division of Ocean Sciences
OCE-1032285	NSF Division of Ocean Sciences

Instruments

CTD - profiler

Supplied Name: CTD

Supplied Description:

Sea-Bird SBE 25 Sealogger CTD; Sea-Bird SBE 33 deck box; Sea-Bird SBE 32C carousel pylon; Sea-Bird SBE 43 oxygen sensor; WET Labs ECO chlorophyll fluorometer; WET Labs ECO CDOM fluorometer; WET Labs ECO BB optical backscatter sensor; LI-COR 193SA PAR sensor; Sea-Bird SBE 5P pump. The carousel was equipped with eight 8-L external-closure water sampling bottles (Ocean Test Equipment Model 110).

Instrument Type

Generic Name: CTD - profiler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.

This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934.

CTD Sea-Bird 25

Supplied Name: CTD SBE 25

Supplied Description:

Sea-Bird SBE 25 Sealogger CTD

Instrument Type

Generic Name: CTD Sea-Bird 25

Acronym: CTD SBE 25

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0040/

Generic Description:

The Sea-Bird SBE 25 SEALOGGER CTD is battery powered and is typically used to record data in memory, eliminating the need for a large vessel, electrical sea cable, and on-board computer. All SBE 25s can also operate in real-time, transmitting data via an opto-isolated RS-232 serial port. Temperature and conductivity are measured by the SBE 3F Temperature sensor and SBE 4 Conductivity sensor (same as those used on the premium SBE 9plus CTD). The SBE 25 also includes the SBE 5P (plastic) or 5T (titanium) Submersible Pump and TC Duct. The pump-controlled, TC-ducted flow configuration significantly reduces salinity spiking caused by ship heave, and in calm waters allows slower descent rates for improved resolution of water column features. Pressure is measured by the modular SBE 29 Temperature Compensated Strain-Gauge Pressure sensor (available in eight depth ranges to suit the operating depth requirement). The SBE 25's modular design makes it easy to configure in the field for a wide range of auxiliary sensors, including optional dissolved oxygen (SBE 43), pH (SBE 18 or SBE 27), fluorescence, transmissivity, PAR, and optical backscatter sensors. More information from Sea-Bird Electronics: http:www.seabird.com.

Nutrient Autoanalyzer

Supplied Name:

Supplied Description:

Flow Injection Analysis (FIA) using a Lachat Instruments model QuickChem 8000

Instrument Type

Generic Name: Nutrient Autoanalyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB04/

Generic Description:

Nutrient Autoanalyzer is a generic term used when specific type, make and model were not specified. In general, a Nutrient Autoanalyzer is an automated flow-thru system for doing nutrient analysis (nitrate, ammonium, orthophosphate, and silicate) on seawater samples.

Sea-Bird SBE 33 Carousel Deck Unit

Supplied Name: SBE 33

Supplied Description:

Instrument Type

Generic Name: Sea-Bird SBE 33 Carousel Deck Unit

Acronym: SBE 33

Generic Description:

The rack-mountable SBE 33 provides power and real-time data acquisition and control for an SBE 32 Carousel Water Sampler that has the SBE 33 interface option installed in its pylon. The SBE 33 is compatible with all Carousel sizes - full size, compact, and sub-compact. When powered and controlled by the SBE 33, the Carousel can be used:

- with an SBE 19, 19plus, 19plus V2, 25, 25plus, or 49 CTD
- without a CTD
- with a Neil Brown Mk III CTD (requires optional interface for both SBE 32 and 33)

The SBE 33 can also provide power and real-time data acquisition and control for the smaller SBE 55 ECO Water Sampler used with an SBE 19, 19plus, 19plus V2, 25, 25plus, or 49 CTD, or no CTD.

See http://www.seabird.com/sbe33-deck-unit for further details.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	2012 cruise number for the R/V Savannah	unitless	cruise_id
year	year	yyyy	year
cast	cast number	unitless	cast
month_gmt	GMT month	1-12	month_gmt
day_gmt	GMT day of month	1-31	day
time_gmt	GMT time	HH:MM:SS	time
yrday_gmt	year day: UTC day and decimal time; as 326.5 for the 326th day of the year or November 22 at 1200 hours (noon).	day.part of day	yrday_utc
ISO_DateTime_UTC	Date/Time (UTC) ISO formatted standard is based on ISO 8601:2004(E) and takes on any of the following forms: 2009-08-30T14:05:00Z (UTC time)	yyyy-mm-ddTHH:MM:SSZ	ISO_DateTime_UTC
lat	latitude; north is positive	decimal degrees	lat
lon	longitude; east is positive	decimal degrees	lon
depth_max	maximum depth of cast	meters	depth_max
station	station: LB# = Middle Transect; LBS# = South Transect; LBN# = North Transect; # = distance counter (km) starting with +00 inshore and increasing offshore	unitless	station
comment	comment	unitless	comment
depth_sample	Depth of water sample	meters	depth
Phosphate	Concentration of dissolved phosphate	micromoles/L	PO4
P_flag	bdl = below detection limit for Flow Injection Analysis (FIA) method used	unitless	flag
Silicate	Concentration of dissolved silicate	micromoles/L	SiO4
Si_flag	bdl = below detection limit for Flow Injection Analysis (FIA) method used	unitless	flag
NO3_NO2	Concentration of sum of dissolved nitrate and dissolved nitrite	micromoles/L	NO3_NO2
Nit_flag	bdl = below detection limit for Flow Injection Analysis (FIA) method used	unitless	flag

Database

Contribute Data

Dataset: LB_2012_Ship_Nutrients
Deployment: SAV-12-05

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: LB_2012_Ship_NutrientsDeployment: SAV-12-05

Dataset acquisition description

Dataset Processing Description

Dataset: LB_2012_Ship_Nutrients
Deployment: SAV-12-05