Dataset: DOC and TDN
Deployment: MSM20-5

Dissolved organic carbon and total dissolved nitrogen from the formation fluids recovered from the CORKs installed at the North Pond in 2012.

Principal Investigator:

Peter Girguis (Harvard University)

Co-Principal Investigator:

Brian Glazer (University of Hawaiʻi at Mānoa, SOEST)

Julie Huber (Marine Biological Laboratory, MBL)

Contact:

Beate Kraft (Harvard University)

BCO-DMO Data Manager:

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

Project:

Collaborative Research: Characterization of Microbial Transformations in Basement Fluids, from Genes to Geochemical Cycling (North Pond Microbes)

Version:

30 Dec 2015

Deployment Synonyms:

MSM20/5, MSM-20-5, BSH20120078

Version Date:

2015-12-30

Data URL:

https://www.bco-dmo.org/dataset-deployment/630366/data

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Description

Dissolved organic carbon and total dissolved nitrogen from the formation fluids recovered from the CORKs installed at the North Pond in 2012 on MSM20-5. The North Pond is an isolated, northeast-trending, ~8 km × 15 km sediment pond located on the western flank of the Mid-Atlantic Ridge (MAR) at 22°45' N and 46°05' W.

Details of these CORKS and their positions, construction and depth can be found in the Proceedings of the IODP expedition 336. See: http://publications.iodp.org/scientific_prospectus/336/336sp_6.htm

In addition to NSF OCE-1061934 (to Girguis), this dataset was funded by C-DEBI (OCE-0939564) sub-award number 41940192 granted to Beate Kraft.

Methods & Sampling

Dataset acquisition description

Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) were measured by high temperature (680 ºC) combustion using a Shimadzu TOC-L analyzer at the SOEST Laboratory for Analytical Biogeochemistry, University of Hawaii. Samples analyzed include those filtered in situ for crustal fluids as well as the CTD samples filtered on deck. Samples were acidified to pH <2 within the autosampler syringe and were purged with nitrogen to remove inorganic carbon. Five to six replicate analyses were performed using an injected sample volume of 150 μL. The detection limits of DOC and TDN were about 2 and 1.5 uM, respectively. Two consensus reference materials CRM, from University of Miami, deep seawater and low carbon water, were used extensively before, between, and after sample analysis to monitor analytical accuracy. The analytical reproducibility for DOC and TDN is better than 1.1 uM and 460 0.2 uM, respectively, by repeated analysis of four deep seawater CRM.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing:
- Modified parameter names to conform with BCO-DMO naming conventions;
- Replaced commas with semi-colons;
- Replaced spaces with underscores;
- Added cruise id numbers.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0939564	NSF Division of Ocean Sciences
OCE-1061934	NSF Division of Ocean Sciences

Instruments

Shimadzu TOC-L Analyzer

Supplied Name: Shimadzu TOC-L analyzer

Supplied Description:

Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) were measured by high temperature (680 degrees C) combustion using a Shimadzu TOC-L analyzer at the SOEST Laboratory for Analytical Biogeochemistry, University of Hawaii.

Instrument Type

Generic Name: Shimadzu TOC-L Analyzer

Acronym: Shimadzu TOC-L

Community Identifier: http://onto.nerc.ac.uk/CAST/124.html

Generic Description:

A Shimadzu TOC-L Analyzer measures DOC by high temperature combustion method.

Developed by Shimadzu, the 680 degree C combustion catalytic oxidation method is now used worldwide. One of its most important features is the capacity to efficiently oxidize hard-to-decompose organic compounds, including insoluble and macromolecular organic compounds. The 680 degree C combustion catalytic oxidation method has been adopted for the TOC-L series.

http://www.shimadzu.com/an/toc/lab/toc-l2.html

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
UH_Cowen_ID	UH_Cowen identification number.	dimensionless	sample
cruise_id	Cruise identifier.	dimensionless	cruise_id
site	Sampling site name. The nomenclature refers to the IODP hole and formation horizon. For example, U1383C-shallow means the fluids came from IODP CORK drillhole 1383C in the shallowest accessible porewater horizon.	dimensionless	site
dive_num	Dive number.	dimensionless	no_bcodmo_term
date	Year-month-day.	YYYYmmdd	date
DOC	Dissolved organic carbon.	micromolar (uM)	DOC
TDN	Total dissolved nitrogen.	micromolar (uM)	TDN

Database

Contribute Data

Dataset: DOC and TDN
Deployment: MSM20-5

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: DOC and TDNDeployment: MSM20-5

Dataset acquisition description

Dataset Processing Description

Dataset: DOC and TDN
Deployment: MSM20-5