Dataset: Chesapeake Bay: N2 to Ar ratio

Name: Dinitrogen to argon ratios (N2:Ar) from CTD bottle samples collected during R/V Hugh R. Sharp cruise HRS1317 in Chesapeake Bay in September of 2013
Published: 2018-06-15
Keywords: oceans

Cite This Dataset

Spatial Extent: N:38.5522 E:-76.3319 S:38.3772 W:-76.4302

Temporal Extent: 2013-09-13 - 2013-09-15

Project:

Collaborative Research: New Approaches to New Production (N-SPOT)

Gene content, gene expression, and physiology in mesopelagic ammonia-oxidizing archaea (AmoA Archaea)

Principal Investigator:

Alyson E. Santoro (University of California-Santa Barbara, UCSB)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2018-06-15

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Dinitrogen to argon ratios (N2:Ar) from CTD bottle samples collected during R/V Hugh R. Sharp cruise HRS1317 in Chesapeake Bay in September of 2013

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Description

Related Datasets (also generated from samples during cruises HRS1316 and HRS1317):
* Chesapeake Bay: Nitrous oxide https://www.bco-dmo.org/dataset/738594
* Chesapeake Bay: Ammonia oxidation rates https://www.bco-dmo.org/dataset/738599
* Chesapeake Bay: Nitrate https://www.bco-dmo.org/dataset/738609
* Chesapeake Bay: Nitrite https://www.bco-dmo.org/dataset/738614
* Chesapeake Bay: Ammonium https://www.bco-dmo.org/dataset/738619

The results paper for these data has been submitted to the journal Estuaries and Coasts (Laperriere et al., submitted).

Methods & Sampling

Water samples were collected using a 12 x 10 L Niskin bottle rosette sampler equipped with a conductivity, temperature, and pressure instrument package (SBE9, Sea-Bird Electronics, Bellevue, Washington, U.S.A.) and a sensor for dissolved oxygen (SBE43, Sea-Bird).

N2:Ar samples were collected in triplicate in 12 mL exetainers directly from the Niskin bottles using a small piece of tubing. The tubing was placed at the bottom of each container and water overflowed by approximately five volumes. The samples were preserved using 20 μL of a saturated mercuric chloride. The serum vials were sealed using butyl septa and aluminum crimp tops, and both sample types were stored at room temperature, which was cooler than sampling temperature, until analysis.

N2:Ar was measured on a membrane inlet mass spectrometer (MIMS) equipped with a flow-through capillary membrane inlet (Bay Instruments, Easton, Maryland) following Kana et al. (1994).

Data Processing Description

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values in this dataset are displayed as "nd" for "no data." nd is the default missing data identifier in the BCO-DMO system.
* removed spaces between minutes and seconds
* removed trailing and leading spaces of values
* removed occasional space after decimal place in original longitude decimal degree format
* added timestamp in UTC (ISO format)

Data Files

File
N2_Ar.csv (Comma Separated Values (.csv), 11.90 KB) MD5:bf1747afe7e4cebd83ee4766605696b2 Primary data file for dataset ID 738604

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1260006
NSF Division of Ocean Sciences	OCE-1437310
NSF Division of Ocean Sciences	OCE-1740538

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
HRS1317	1302	2013-09-12	R/V Hugh R. Sharp	Michael R. Roman (Chief Scientist)	data info

Instruments

CTD Sea-Bird 9

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird 9

Acronym: CTD SBE 9

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

Generic Description:

The Sea-Bird SBE 9 is a type of CTD instrument package. The SBE 9 is the Underwater Unit and is most often combined with the SBE 11 Deck Unit (for real-time readout using conductive wire) when deployed from a research vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorometer, altimeter, etc.). Note that in most cases, it is more accurate to specify SBE 911 than SBE 9 since it is likely a SBE 11 deck unit was used. more information from Sea-Bird Electronics

Membrane Inlet Mass Spectrometer

Supplied Name: membrane inlet mass spectrometer (MIMS)

Supplied Description:

N2:Ar was measured on a membrane inlet mass spectrometer (MIMS) equipped with a flow-through capillary membrane inlet (Bay Instruments, Easton, Maryland)

Instrument Type

Generic Name: Membrane Inlet Mass Spectrometer

Acronym: MIMS

Generic Description:

Membrane-introduction mass spectrometry (MIMS) is a method of introducing analytes into the mass spectrometer's vacuum chamber via a semipermeable membrane.

Niskin bottle

Supplied Name:

Supplied Description:

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.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
station	Station number	unitless	station
date	Date of sample collection (local EDT)	unitless	date
time	Time of sample collection (local EDT)	untiless	time
lat	Latitude (N)	degrees decimal minutes	lat
lon	Longitude (W)	degrees decimal minutes	lon
depth	Depth	meters	depth
n2_ar	Dinitrogen to argon ration (N2:Ar)	dimensionless	no_bcodmo_term
replicate	Replicate number	unitless	replicate
ISO_DateTime_UTC	ISO timestamp based on the ISO 8601:2004(E) standard in format YYYY-mm-ddTHH:MMZ (UTC)	unitless	ISO_DateTime_UTC
lat_dd	Latitude	decimal degrees	lat
lon_dd	Longitude	decimal degrees	lon

Status message

Database

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Dataset: Chesapeake Bay: N2 to Ar ratio