Dataset: orgCN
Deployment: W9709B

Particulate and dissolved organic carbon and nitrogen data

Principal Investigator:

Patricia Wheeler (Oregon State University, OSU-CEOAS)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

U.S. GLOBEC Northeast Pacific (NEP)

Current State:

Final no updates expected

Version Date:

2012-04-23

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/455080/data

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Description

This dataset contains particulate and dissolved organic carbon and nitrogen data from the GLOBEC Northeast Pacific (NEP) Long-Term Observation Program (LTOP) cruises from 1997 to 2004. The nutrient and extracted chlorophyll data that correspond to this dataset can be also be found in the BCO-DMO database.

For further hydrographic information from all cruises, see cruise reports provided on the Northeast Pacific Long Term Observation Program website, or contact Dr. A Huyer at Oregon State University, COAS,104 COAS Admin. Bldg., Corvallis, OR, 97331-5503. All particulate and dissolved organic carbon and nitrogen data in this dataset include cruise station numbers to allow comparison with the hydrographic information found in other data reports.

Methods & Sampling

Dataset acquisition description

At each station, water samples were collected from various depths with 5 L Niskin bottles on a 12 bottle rosette. Complete information on sample collection and analyses is available in the Data Report (PDF).

Data Processing Description

Dataset Processing Description

Complete analyses information is available in the Data Report (PDF).

Data are presented as depth profiles for each station along latitudinal lines. Lines are listed by decreasing latitude and stations are listed from inshore to offshore. Cruise ID and station numbers are included for reference to other cruise data. GMT date and GMT time indicate the date/time at the start of the CTD cast. Depth (pressure in dbar), temperature (°C), and salinity are also included as measured by CTD when Niskin bottles were fired (upcast). Units for POC, PON, DOC and DON are all μM.

BCO-DMO received the data in 8 Excel files, one for each year of sampling. The following modifications were made: deleted blank rows; replaced blank cells with 'nd'; changed column names to conform to BCO-DMO convention; converted .XLS files to .DAT; original time in HH:MM format and date in mm/dd/YYYY format were removed from display; added day_gmt, month_gmt, and time_gmt columns, which are calculated from the original date and time columns. The 2004 Wecoma cruise ID was corrected from 'W0409' to 'W0408D' and the Data Report was updated in June 2012 to reflect the change.

More information about this dataset deployment

Funding

Award Number	Funding Source
NA67RJ0151 (NEP)	National Oceanic and Atmospheric Administration
NA86OP0589 (NEP)	National Oceanic and Atmospheric Administration
OCE-0000733	NSF Division of Ocean Sciences
OCE-9732386	NSF Division of Ocean Sciences

Instruments

CHN Elemental Analyzer

Supplied Description:

A Carlo Erba CNS analyzer and Control Equipment Corp. 440HA CHN elemental analyzer were used for analyses of POC and PON.

Instrument Type

Generic Name: CHN Elemental Analyzer

Acronym: CHN_EA

Generic Description:

A CHN Elemental Analyzer is used for the determination of carbon, hydrogen, and nitrogen content in organic and other types of materials, including solids, liquids, volatile, and viscous samples.

Niskin bottle

Supplied Description:

At each station, water samples were collected from various depths with 5 L Niskin bottles on a 12 bottle rosette.

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Nutrient Autoanalyzer

Supplied Description:

Technicon AA-II was used for analyses of Total Nitrogen.

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.

Total Organic Carbon Analyzer

Supplied Description:

TOC analyses were perfomed using a Shimadzu TOC-500 (for 1997 and 1998 samples). The Shimadzu TOC-500 TOC analyzer measures total carbon (TC), inorganic carbon (IC) and total organic carbon (TOC) in water. TC, TOC and IC are measured by the combustion-non-dispersive infrared gas analysis method. Starting in April 2000, a Shimadzu TOC-5000A analyzer with an ASI 5000 autosampler was used.

Instrument Type

Generic Name: Total Organic Carbon Analyzer

Acronym: TOC analyzer

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

Generic Description:

A unit that accurately determines the carbon concentrations of organic compounds typically by detecting and measuring its combustion product (CO2). See description document at: http://bcodata.whoi.edu/LaurentianGreatLakes_Chemistry/bs116.pdf

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
year	Year in YYYY format.	dimensionless	year
cruise_id	Alpha-numeric cruise ID number.	dimensionless	cruise_id
station_std	Standard station identifier; provides reference to other GLOBEC NEP cruise data. Originally named 'Station Name'.	dimensionless	station_std
station	Station number.	dimensionless	station
month_gmt	Month in GMT format. Converted from original 'GMT Date' field, which was in mm/dd/YYYY format.	dimensionless	month_gmt
day_gmt	Day in GMT format. Converted from original 'GMT Date' field, which was in mm/dd/YYYY format.	dimesionless	day_gmt
time_gmt	Time in GMT format. Converted from original 'GMT Time' field, which was in HH:MM format.	HHMM, 24-hr clock	time_gmt
lat	Latitude, positive values = North. Originally named 'Lat N'.	decimal degrees	lat
lon	Longitude, negative values = West. Originally named 'Long W'.	decimal degrees	lon
press	Pressure (in dbar) as measured by CTD when Niskin bottles were fired (upcast). Proxy for depth.	decibars	press
temp	Water temperature as measured by CTD when Niskin bottles were fired (upcast).	degrees C	temp
sal	Salinity as measured by CTD when Niskin bottles were fired (upcast).	unknown	sal
TN	Total Nitrogen (micromolar). Fliers greater than 1sd from the mean replicate value were deleted from the dataset. Other TN data were deleted if values were abnormally high or low according to the depth profile or expected ranges.	micromolar	no_bcodmo_term
TOC	Total organic Carbon (micromolar). Data from the following cruises have not been analyzed: Sept 1997 (NH 45-85), Nov 1997 (NH 25-65, FM, CR and COC lines), Jan 1998 (part of NH line, all of FM line), Apr 1998 (parts of NH, all of FM, CR and COC lines), Nov 1998 (all), all cruises in 1999, and Feb 2000. See the data report for a description of outliers omitted from dataset.	micromolar	TOC
POC	Particulate organic Carbon (micromolar). See the data report for a description of outliers omitted from dataset.	micromolar	POC_JG
PON	Particulate organic Nitrogen (micromolar). See the data report for a description of outliers omitted from dataset.	micromolar	PON_JG
DOC	Dissolved organic Carbon (micromolar). DOC was determined by subtracting POC values from TOC values. Individual data points were deleted if the coefficient of variation remained greater than 15% after removing data points greater than one sd from the mean. Various points were deleted if the sample value was determined to be below the detection limit. If POC data were missing, the corresponding DOC values were not calculated.	micromolar	DOC
DON	Dissolved organic Nitrogen (micromolar). DON was determined by subtracting PON and DIN (NH4, NO3-, and NO2-) values from TN values. Individual data points were deleted if the coefficient of variation remained greater than 15% after removing data points greater than one sd from the mean. Various points were deleted if the sample value was determined to be below the detection limit. If PON data were missing, DON values were left in if they met the following criteria: sample depth was > 50m and surrounding values were less than or equal to 10% of the DON values. Other DON data were deleted if values were abnormally high or low according to the depth profile or expected ranges.	micromolar	DON
ISO_DateTime_UTC	Date and time (UTC) formatted to ISO8601 standard. T indicates start of time string; Z indicates UTC.	YYYY-mm-ddTHH:MM:SS.ssZ	ISO_DateTime_UTC

Database

Contribute Data

Dataset: orgCN
Deployment: W9709B

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: orgCNDeployment: W9709B

Dataset acquisition description

Dataset Processing Description

Dataset: orgCN
Deployment: W9709B