Dataset: GT10-11 - Aerosol Carbon

Name: Organic carbon and water soluble organic carbon atmospheric loadings from aerosol samples from R/V Knorr GEOTRACES cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean in 2010 and 2011
Published: 2015-12-29
Keywords: oceans

Cite This Dataset

Spatial Extent: N:40.34 E:-9.66 S:17.35 W:-70.26

Project:

Role of Organic Matter in Determining the Solubility of Atmospherically-Delivered Iron (GEOTRACES Aerosol OM)

U.S. GEOTRACES North Atlantic Transect (GA03) (U.S. GEOTRACES NAT)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

Andrew S. Wozniak (Old Dominion University, ODU)

Co-Principal Investigator:

Patrick G. Hatcher (Old Dominion University, ODU)

BCO-DMO Data Manager:

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

Version:

29 Dec 2015

Version Date:

2015-12-29

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Organic carbon and water soluble organic carbon atmospheric loadings from aerosol samples from R/V Knorr GEOTRACES cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean in 2010 and 2011

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Description

Sampling details and identities of each of the samples are provided along with organic carbon and water soluble organic carbon atmospheric loadings. This includes: starting and ending locations (latitudes and longitudes) and times (Greenwich mean time) as well as the sampling rates (m3 min-1) and calculated sample volumes (m3) for each of the aerosol samples. The run times (measured in hours) and sample volumes account for periods when the sampler was stopped due to potential contamination from the ship’s stack. The organic carbon and water soluble organic carbon atmospheric loadings for each aerosol sample are included. The data are reported in micrograms of C m-3 air sampled. Errors represent the standard deviation for replicate measurements.

Methods & Sampling

The analytical and data processing methodology have been described in Wozniak et al. (2013, 2015). The full citations for these references are listed below. A summary of the methods is quoted here:

Aerosol total organic carbon (TOC = organic carbon + elemental carbon) concentrations were measured using a CE Elantech Flash EA 1112 series elemental analyzer following published protocols (e.g., Wozniak et al., 2008; 2011). Briefly, aerosol subsamples (2.84 cm2) were taken from the QMA filter samples with a stainless steel cork borer plug, acidified with 1M HCl to remove inorganic carbonates, and dried overnight at 60 degrees C. Triplicate acidified filter plugs were placed in 5x9 mm tin cups and combusted at 900 degrees C in the presence of O2. Sample response areas were calibrated to a standard curve generated with an aspartic acid standard. Mean filter blank TOC (~0.0035 ± 0.0006 mg C per plug) amounts were subtracted to calculate TOC values.

Aerosol WSOC concentrations were measured on a Shimadzu TOC-V Combustion Analyzer using high temperature (680 degrees C) Pt-catalyzed oxidation coupled to non-dispersive infrared gas detection of CO2 following published procedures (Wozniak et al., 2008; 2012). Calibration curves for WSOC were created using a potassium hydrogen phthalate standard. All samples for WSOC analysis were acidified to remove inorganic carbon with 2-3 drops of 1M hydrochloric acid constituted in ultrapure water and analyzed in triplicate. Samples were blank corrected by subtracting mean contributions from filter blank material extracted in ultrapure water.

References:
Wozniak, A.S., Bauer, J.E., Sleighter, R.L., Dickhut, R.M., Hatcher, P.G. 2008. Technical Note: Molecular characterization of aerosol-derived water soluble organic carbon using ultrahigh resolution electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. Atmos. Chem. Phys., 8, 5099-5111. doi:10.5194/acp-8-5099-2008

Wozniak, A.S., Bauer, J.E., Dickhut, R.M. 2011. Fossil and contemporary aerosol particulate organic carbon in the eastern United States: Implications for deposition and inputs to watersheds. Global Biogeochem. Cycles, 25, GB2013. doi:10.1029/2010GB003855

Wozniak, A.S., Bauer, J.E., Dickhut, R.M. 2012. Characteristics of water-soluble organic carbon associated with aerosol particles in the Eastern United States. Atmos. Environ., 46, 181-188. doi:10.1016/j.atmosenv.2011.10.001

Wozniak, A. S., R. L. Sleighter, H. Abdulla, A. S. Priest, P. L. Morton, R. U. Shelley, W. M. Landing, and P. G. Hatcher. 2013. Relationships among aerosol water soluble organic matter, iron and aluminum in European, North African, and Marine air masses from the 2010 US GEOTRACES cruise. Marine Chemistry, 154, 24-33. doi:10.1016/j.marchem.2013.04.011

Wozniak, A. S., R. U. Shelley, S. M. McElhenie, A. S. Willoughby, W. M. Landing, P. G. Hatcher. 2015. Insights into potential Fe-binding aerosol water soluble organic ligands from the 2011 US GEOTRACES cruise. Marine Chemistry, 173, 162-172, doi:10.1016/j.marchem.2014.11.002

Data Processing Description

BCO-DMO Processing:
- Modified parameter names to conform with BCO-DMO naming conventions;
- merged carbon data with sample information;
- added cruise id, event numbers, and station numbers from BCO-DMO GEOTRACES NAT master event file;
- replaced missing data with 'nd';
- converted date-time fields to ISO format;
- changed longitude values to negative.

Data Files

File
GT10-11_Aerosol_C.csv (Comma Separated Values (.csv), 6.04 KB) MD5:31f0772d526badd31d128371be79b983 Primary data file for dataset ID 651723

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1234166

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KN199-04	GA03 GT10 USGT-NAT-2010 KN199-4 GNAT U.S. GEOTRACES NAZT Leg 1 knorr199-4/5 Section Cruise (GA03) 316N20101015	2010-10-15	R/V Knorr	William J. Jenkins (Chief Scientist) Edward A. Boyle (Co-Chief Scientist) Gregory A. Cutter (Co-Chief Scientist)	data info
KN204-01	GA03 GT11 KN204-01A KN204-01B USGT-NAT-2011 USGNAZT GNAT 316N20111106 KN204-1	2011-11-06	R/V Knorr	Edward A. Boyle (Chief Scientist) Gregory A. Cutter (Co-Chief Scientist)	data info

Instruments

Aerosol Sampler

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Aerosol Sampler

Acronym: Aerosol_Sampler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/13/

Generic Description:

A device that collects a sample of aerosol (dry particles or liquid droplets) from the atmosphere.

Elemental Analyzer

Supplied Name: CE Elantech Flash EA 1112

Supplied Description:

Instrument Type

Generic Name: Elemental Analyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB01/

Generic Description:

Instruments that quantify carbon, nitrogen and sometimes other elements by combusting the sample at very high temperature and assaying the resulting gaseous oxides. Usually used for samples including organic material.

Shimadzu TOC-V Analyzer

Supplied Name: Shimadzu TOC-V

Supplied Description:

Instrument Type

Generic Name: Shimadzu TOC-V Analyzer

Acronym: Shimadzu TOC-V

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

Generic Description:

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

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise identifer	unitless	cruise_id
sample_GEOTRC	GEOTRACES sample number	unitless	sample
station	Station number; added from the BCO-DMO GEOTRACES NAT master events file.	unitless	sta
event_GEOTRC	GEOTRACES event number; added from the BCO-DMO GEOTRACES NAT master events file.	unitless	event
filter_size	Filter size. Whatman QMA filters are typically sold as 8"x10" sheets in the U.S.	inches	filter_size
filter_type	Filter type	unitless	no_bcodmo_term
ISO_DateTime_UTC_Start	Date and time, formatted to ISO8601 standard, at the start of the sampling event. Format: YYYY-mm-ddTHH:MM:SS.xx	unitless	ISO_DateTime_UTC
lat_start	Latitude at the start of the sampling event.	decimal degrees	lat
lon_start	Longitude at the start of the sampling event.	decimal degrees	lon
ISO_DateTime_UTC_End	Date and time, formatted to ISO8601 standard, at the end of the sampling event. Format: YYYY-mm-ddTHH:MM:SS.xx	unitless	ISO_DateTime_UTC
lat_end	Latitude at the end of the sampling event.	decimal degrees	lat
lon_end	Longitude at the end of the sampling event.	decimal degrees	lon
run_time	Run time in hours	hours	no_bcodmo_term
flow_rate	Sampling rate	cubic meters per minute (m3 min-1)	no_bcodmo_term
total	Total sample size	cubic meters (m3)	no_bcodmo_term
C_org	Organic carbon atmospheric loading	micrograms C per cubic meter air sampled (mg C m-3)	C_org
C_org_stdev	Standard deviation of the replicate measurements of C_org	micrograms C per cubic meter air sampled (mg C m-3)	std_dev
C_wso	Water soluble organic (WSO) carbon atmospheric loading	micrograms WSO C per cubic meter air sampled (mg C m-3)	no_bcodmo_term
C_wso_stdev	Standard deviation of the replicate measurements of C_wso	micrograms WSO C per cubic meter air sampled (mg C m-3)	std_dev

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Dataset: GT10-11 - Aerosol Carbon