Dataset: GT10-11 - Trace Metals Aerosol
Deployment: KN204-01

Total aerosol trace metal concentrations.

Principal Investigator:

William M. Landing (Florida State University, FSU - EOAS)

Contact:

Rachel Shelley (Florida State University, FSU - EOAS)

BCO-DMO Data Manager:

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

Project:

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

Current State:

Final with updates expected

Version:

30 Jan 2013

Deployment Synonyms:

GA03, GT11, KN204-01A, KN204-01B, USGT-NAT-2011, USGNAZT, GNAT, 316N20111106, KN204-1

Version Date:

2014-09-16

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/455739/data

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Description

Total aerosol trace metals (Li, Na, Mg, Al, P, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Se, Rb, Sr, Zr, Cd, Sn, Sb, Cs, Ba, La, Nd, Pb, Th, U) from the 2010 and 2011 U.S. GEOTRACES North Atlantic Transect cruises.

Please note that some US GEOTRACES data may not be final, pending intercalibration results and further analysis. If you are interested in following changes to US GEOTRACES NAT data, there is an RSS feed available via the BCO-DMO US GEOTRACES project page (scroll down and expand the "Datasets" section).

Methods & Sampling

Dataset acquisition description

Sample Collection
Aerosol samples were collected on acid-washed Whatman 41 (W41) cellulose ester filter papers deployed in one of two high-volume aerosol samplers (model 5170-VBL, Tisch Environmental) deployed simultaneously operating at approximately 1.2 cubic meters air per minute. The aerosol samplers were deployed on the ship’s flying bridge (14 m above sea level) as high off the water as possible. Contamination from the ship’s stack exhaust was avoided by controlling aerosol sampling with respect to wind sector and wind speed using an anemometer interfaced with a Campbell Scientific CR800 datalogger and PC. The samplers were allowed to run when the wind was +/- 60 degrees from the bow and > 0.5 m/s. When the wind failed to meet these two criteria, the motors were shut off automatically and not allowed to restart until the wind met both the speed and direction criteria for 5 continuous minutes. The anemometer was deployed nearby on a separate pole in 'free air' where turbulence from the wind crossing the bow did not cause the wind vane to wobble excessively.

Trace Metal Determination
For determinations of total aerosol trace metal composition, the W41 filter discs were digested in tightly capped Teflon vials using sequential additions of concentrated acid solutions [nitric acid (Optima) and hydrofluoric acid (Optima)] at 150 degrees C (Morton et al., 2013, accepted). Any solution remaining after each digestion step was heated to dryness. After the final digestion and dry down, the samples were re-dissolved with 0.32 M nitric acid for analysis using inductively-coupled plasma mass spectrometry (ICP-MS; Agilent 7500CS and Thermo Element 2). All filter digestions were performed under a Class 100 laminar flow hood at the National High Magnetic Field Laboratory at Florida State University (FSU).

Filters for both the total and soluble aerosol concentration measurements were stored frozen prior to processing.

Blank solutions for the acid digestions were prepared by digesting W41 discs that had been deployed in the aerosol samplers for 1 h while not in operation. For example, blanks accounted for 65.6 ± 0.52 ng m-3 air Fe (representing an average of 0.09 ± 0.001% of the Fe sample concentrations). Trace metal concentrations in the blanks were subtracted from all acid-digested filter samples. Leachate blanks were prepared by passing 100 mL of deionized water through W41 filters that had also been deployed in the same way as the acid digestion blanks. Blank leachates averaged 0.004 ± 0.001 ng m-3 air dissolved Fe (representing an average of 1.6 ± 0.38% of the Fe sample concentrations) and were subsequently subtracted from all leachate sample concentrations. Relative standard deviations of replicate analyses averaged 7% for total Fe concentrations. Replicate analyses of soluble Fe produced relative standard deviations of 10%.

References:
Buck, C.S., et al. 2010. The solubility and deposition of aerosol Fe and other trace elements in the North Atlantic Ocean: observations from the A16N CLIVAR/CO2 repeat hydrography section. Marine Chemistry 120, 57-70. doi: 10.1016/j.marchem.2008.08.003.
Buck, C. S., Landing, W.M., Resing, J. A., Lebon, G. T. 2006. Aerosol iron and aluminum solubility in the northwest Pacific Ocean: Results from the 2002 IOC cruise. Geochemistry, Geophysics, Geosystems. 7. doi: 10.1029/2005GC000977.
Morton, P.L. et al. 2013. Methods for the sampling and analysis of marine aerosols: results from the 2008 GEOTRACES aerosol intercalibration experiment. Limnology and Oceanography Methods 11:62-78. doi: 10.4319/lom.2013.11.62.

Data Processing Description

Dataset Processing Description

Concentrations below the detection limit are flagged as "below_DL" (originally " <_DL") in the data columns. Representative detection limits were calculated using an air volume of 1200 cubic meters. See PDF of detection limits for this dataset.

Quality flag definitions:
BDL = below detection limit.
0 = No QC performed.
1 = Good data.
2 = Probably good data.
3 = Probably bad data that is potentially correctable.
4 = Bad data.
5 = Value changed.
6 = Sample < blank.
8 = Interpolated value.
9 = Missing value.

BCO-DMO made the following modifications:
- Replaced blanks with 'nd'.
- Replaced ' < DL' with 'below_DL'. Replaced '< blank' with 'lt_blank'.
- Changed PI-supplied cruise IDs of KN204-2 and KN204-5 to KN204-01A and KN204-01B. Added 'cruise_part' column to distingush between parts A and B of cruise KN204-01.
- Copied averages and variances to all rows containing data for that sample (where applicable).

Additional GEOTRACES Processing: After the data were submitted to the International Data Management Office, BODC, the office noticed that important identifying information was missing in many datasets. With the agreement of BODC and the US GEOTRACES lead PIs, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters: station_GEOTRC, cast_GEOTRC (bottle and pump data only), event_GEOTRC, sample_GEOTRC, sample_bottle_GEOTRC (bottle data only), bottle_GEOTRC (bottle data only), depth_GEOTRC_CTD (bottle data only), depth_GEOTRC_CTD_rounded (bottle data only), BTL_ISO_DateTime_UTC (bottle data only), and GeoFish_id (GeoFish data only). This added information will facilitate subsequent analysis and inter comparison of the datasets.

Bottle parameters in the master file were taken from the GT-C_Bottle_GT10, GT-C_Bottle_GT11, ODF_Bottle_GT10, and ODF_Bottle_GT11 datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the Event_Log_GT10 and Event_Log_GT11 datasets. McLane pump cast numbers missing in event logs were taken from the Particulate Th-234 dataset submitted by Ken Buesseler.

A standardized BCO-DMO method (called “join”) was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.

If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the name of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.

See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0752351	NSF Division of Ocean Sciences
OCE-0929919	NSF Division of Ocean Sciences
OCE-1132766	NSF Division of Ocean Sciences

Instruments

Aerosol Sampler

Supplied Description:

Two high-volume Tisch Environmental (model 5170-VBL) aerosol samplers were used.

Instrument Type

Generic Name: 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.

Anemometer

Supplied Description:

Instrument Type

Generic Name: Anemometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/101/

Generic Description:

An anemometer is a device for measuring the velocity or the pressure of the wind. It is commonly used to measure wind speed. Aboard research vessels, it is often mounted with other meteorological instruments and sensors.

Inductively Coupled Plasma Mass Spectrometer

Supplied Description:

Agilent 7500CS and Thermo Element 2 inductively-coupled plasma mass spectrometers (ICP-MS) were used to determine total aerosol trace metal concentrations.

Instrument Type

Generic Name: Inductively Coupled Plasma Mass Spectrometer

Acronym: ICP Mass Spec

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/

Generic Description:

An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Official cruise identifier e.g. KN199-04 = R/V Knorr cruise number 199-04.	dimensionless	cruise_id
cruise_part	Part of cruise. For KN204-01: A = 11/6/2011 to 11/18/2011 (Woods Hole to Bermuda) B = 11/19/2011 to 12/11/2011 (Bermuda to Praia, Cabo Verde)	text	cruise_part
sample_GEOTRC	Unique identifying number for US GEOTRACES samples; ranges from 5033 to 6078 for KN199-04 and from 6112 to 8148 for KN204-01. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'sample #', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.	dimensionless	sample
PVC_plate_position	PVC plate position. Location of W41 disc filter on 12 position filter holder.	unitless	no_bcodmo_term
julian_day	Julian day at start of sampling event.	jjj	julian_day
day_start	2-digit day of month at start of sampling event.	dd (01 to 31)	day_start
month_start	2-digit month of year at start of sampling event.	mm (01 to 12)	month_start
year_start	4-digit year at start of sampling event.	YYYY	year_start
time_start_utc	Time (UTC) at start of sampling event. 24-hour clock.	HHMM	time_start
lat_start	Latitude at start of sampling event. North = Positive.	decimal degrees	lat_start
lon_start	Longitude at start of sampling event. West = Negative.	decimal degrees	lon_start
day_end	2-digit day of month at end of sampling event.	dd (01 to 31)	day_end
month_end	2-digit month of year at end of sampling event.	mm (01 to 12)	month_end
year_end	4-digit year at end of sampling event.	YYYY	year_end
time_end_utc	Time (UTC) at end of sampling event. 24-hour clock.	HHMM	time_end
lat_end	Latitude at end of sampling event. North = Positive.	decimal degrees	lat_end
lon_end	Longitude at end of sampling event. West = Negative.	decimal degrees	lon_end
air_vol_tot	Total volume of air sampled in cubic meters.	m^3	sample_volume
air_vol_per_filt	Volume of air filtered per filter in cubic meters.	m^3	sample_volume
Li_tot	Total aerosol Li (Lithium) concentration.	ng/m^3	metal_conc_air
Li_tot_avg	Total aerosol Li average sample concentration.	ng/m^3	no_bcodmo_term
Li_tot_var	Total aerosol Li sample concentration variance.	ng/m^3	no_bcodmo_term
Li_tot_flag	Total aerosol Li concnetration data quality flag.	unitless	no_bcodmo_term
Na_tot	Total aerosol Na (Sodium) concentration.	ng/m^3	metal_conc_air
Na_tot_avg	Total aerosol Na average sample concentration.	ng/m^3	no_bcodmo_term
Na_tot_var	Total aerosol Na sample concentration variance.	ng/m^3	no_bcodmo_term
Na_tot_flag	Total aerosol Na concnetration data quality flag.	unitless	no_bcodmo_term
Mg_tot	Total aerosol Mg (Magnesium) concentration.	ng/m^3	metal_conc_air
Mg_tot_avg	Total aerosol Mg average sample concentration.	ng/m^3	no_bcodmo_term
Mg_tot_var	Total aerosol Mg sample concentration variance.	ng/m^3	no_bcodmo_term
Mg_tot_flag	Total aerosol Mg concnetration data quality flag.	unitless	no_bcodmo_term
Al_tot	Total aerosol Al (Aluminum) concentration.	ng/m^3	metal_conc_air
Al_tot_avg	Total aerosol Al average sample concentration.	ng/m^3	no_bcodmo_term
Al_tot_var	Total aerosol Al sample concentration variance.	ng/m^3	no_bcodmo_term
Al_tot_flag	Total aerosol Al concnetration data quality flag.	unitless	no_bcodmo_term
P_tot	Total aerosol P (Phosphorus) concentration.	ng/m^3	metal_conc_air
P_tot_avg	Total aerosol P average sample concentration.	ng/m^3	no_bcodmo_term
P_tot_var	Total aerosol P sample concentration variance.	ng/m^3	no_bcodmo_term
P_tot_flag	Total aerosol P concnetration data quality flag.	unitless	no_bcodmo_term
Sc_tot	Total aerosol Sc (Scandium) concentration.	ng/m^3	metal_conc_air
Sc_tot_avg	Total aerosol Sc average sample concentration.	ng/m^3	no_bcodmo_term
Sc_tot_var	Total aerosol Sc sample concentration variance.	ng/m^3	no_bcodmo_term
Sc_tot_flag	Total aerosol Sc concnetration data quality flag.	unitless	no_bcodmo_term
Ti_tot	Total aerosol Ti (Titanium) concentration.	ng/m^3	metal_conc_air
Ti_tot_avg	Total aerosol Ti average sample concentration.	ng/m^3	no_bcodmo_term
Ti_tot_var	Total aerosol Ti sample concentration variance.	ng/m^3	no_bcodmo_term
Ti_tot_flag	Total aerosol Ti concnetration data quality flag.	unitless	no_bcodmo_term
V_tot	Total aerosol V (Vanadium) concentration.	ng/m^3	metal_conc_air
V_tot_avg	Total aerosol V average sample concentration.	ng/m^3	no_bcodmo_term
V_tot_var	Total aerosol V sample concentration variance.	ng/m^3	no_bcodmo_term
V_tot_flag	Total aerosol V concnetration data quality flag.	unitless	no_bcodmo_term
Cr_tot	Total aerosol Cr (Chromium) concentration.	ng/m^3	metal_conc_air
Cr_tot_avg	Total aerosol Cr average sample concentration.	ng/m^3	no_bcodmo_term
Cr_tot_var	Total aerosol Cr sample concentration variance.	ng/m^3	no_bcodmo_term
Cr_tot_flag	Total aerosol Cr concnetration data quality flag.	unitless	no_bcodmo_term
Mn_tot	Total aerosol Mn (Manganese) concentration.	ng/m^3	metal_conc_air
Mn_tot_avg	Total aerosol Mn average sample concentration.	ng/m^3	no_bcodmo_term
Mn_tot_var	Total aerosol Mn sample concentration variance.	ng/m^3	no_bcodmo_term
Mn_tot_flag	Total aerosol Mn concnetration data quality flag.	unitless	no_bcodmo_term
Fe_tot	Total aerosol Fe (Iron) concentration.	ng/m^3	metal_conc_air
Fe_tot_avg	Total aerosol Fe average sample concentration.	ng/m^3	no_bcodmo_term
Fe_tot_var	Total aerosol Fe sample concentration variance.	ng/m^3	no_bcodmo_term
Fe_tot_flag	Total aerosol Fe concnetration data quality flag.	unitless	no_bcodmo_term
Co_tot	Total aerosol Co (Cobalt) concentration.	ng/m^3	metal_conc_air
Co_tot_avg	Total aerosol Co average sample concentration.	ng/m^3	no_bcodmo_term
Co_tot_var	Total aerosol Co sample concentration variance.	ng/m^3	no_bcodmo_term
Co_tot_flag	Total aerosol Co concnetration data quality flag.	unitless	no_bcodmo_term
Ni_tot	Total aerosol Ni (Nickel) concentration.	ng/m^3	metal_conc_air
Ni_tot_avg	Total aerosol Ni average sample concentration.	ng/m^3	no_bcodmo_term
Ni_tot_var	Total aerosol Ni sample concentration variance.	ng/m^3	no_bcodmo_term
Ni_tot_flag	Total aerosol Ni concnetration data quality flag.	unitless	no_bcodmo_term
Cu_tot	Total aerosol Cu (Copper) concentration.	ng/m^3	metal_conc_air
Cu_tot_avg	Total aerosol Cu average sample concentration.	ng/m^3	no_bcodmo_term
Cu_tot_var	Total aerosol Cu sample concentration variance.	ng/m^3	no_bcodmo_term
Cu_tot_flag	Total aerosol Cu concnetration data quality flag.	unitless	no_bcodmo_term
Zn_tot	Total aerosol Zn (Zinc) concentration.	ng/m^3	metal_conc_air
Zn_tot_avg	Total aerosol Zn average sample concentration.	ng/m^3	no_bcodmo_term
Zn_tot_var	Total aerosol Zn sample concentration variance.	ng/m^3	no_bcodmo_term
Zn_tot_flag	Total aerosol Zn concnetration data quality flag.	unitless	no_bcodmo_term
Ga_tot	Total aerosol Ga (Gallium) concentration.	ng/m^3	metal_conc_air
Ga_tot_avg	Total aerosol Ga average sample concentration.	ng/m^3	no_bcodmo_term
Ga_tot_var	Total aerosol Ga sample concentration variance.	ng/m^3	no_bcodmo_term
Ga_tot_flag	Total aerosol Ga concnetration data quality flag.	unitless	no_bcodmo_term
As_tot	Total aerosol As (Arsenic) concentration.	ng/m^3	metal_conc_air
As_tot_avg	Total aerosol As average sample concentration.	ng/m^3	no_bcodmo_term
As_tot_var	Total aerosol As sample concentration variance.	ng/m^3	no_bcodmo_term
As_tot_flag	Total aerosol As concnetration data quality flag.	unitless	no_bcodmo_term
Se_tot	Total aerosol Se (Selenium) concentration.	ng/m^3	metal_conc_air
Se_tot_avg	Total aerosol Se average sample concentration.	ng/m^3	no_bcodmo_term
Se_tot_var	Total aerosol Se sample concentration variance.	ng/m^3	no_bcodmo_term
Se_tot_flag	Total aerosol Se concnetration data quality flag.	unitless	no_bcodmo_term
Rb_tot	Total aerosol Rb (Rubidium) concentration.	ng/m^3	metal_conc_air
Rb_tot_avg	Total aerosol Rb average sample concentration.	ng/m^3	no_bcodmo_term
Rb_tot_var	Total aerosol Rb sample concentration variance.	ng/m^3	no_bcodmo_term
Rb_tot_flag	Total aerosol Rb concnetration data quality flag.	unitless	no_bcodmo_term
Sr_tot	Total aerosol Sr (Strontium) concentration.	ng/m^3	metal_conc_air
Sr_tot_avg	Total aerosol Sr average sample concentration.	ng/m^3	no_bcodmo_term
Sr_tot_var	Total aerosol Sr sample concentration variance.	ng/m^3	no_bcodmo_term
Sr_tot_flag	Total aerosol Sr concnetration data quality flag.	unitless	no_bcodmo_term
Zr_tot	Total aerosol Zr (Zirconium) concentration.	ng/m^3	metal_conc_air
Zr_tot_avg	Total aerosol Zr average sample concentration.	ng/m^3	no_bcodmo_term
Zr_tot_var	Total aerosol Zr sample concentration variance.	ng/m^3	no_bcodmo_term
Zr_tot_flag	Total aerosol Zr concnetration data quality flag.	unitless	no_bcodmo_term
Cd_tot	Total aerosol Cd (Cadmium) concentration.	ng/m^3	metal_conc_air
Cd_tot_avg	Total aerosol Cd average sample concentration.	ng/m^3	no_bcodmo_term
Cd_tot_var	Total aerosol Cd sample concentration variance.	ng/m^3	no_bcodmo_term
Cd_tot_flag	Total aerosol Cd concnetration data quality flag.	unitless	no_bcodmo_term
Sn_tot	Total aerosol Sn (Tin) concentration.	ng/m^3	metal_conc_air
Sn_tot_avg	Total aerosol Sn average sample concentration.	ng/m^3	no_bcodmo_term
Sn_tot_var	Total aerosol Sn sample concentration variance.	ng/m^3	no_bcodmo_term
Sn_tot_flag	Total aerosol Sn concnetration data quality flag.	unitless	no_bcodmo_term
Sb_tot	Total aerosol Sb (Antimony) concentration.	ng/m^3	metal_conc_air
Sb_tot_avg	Total aerosol Sb average sample concentration.	ng/m^3	no_bcodmo_term
Sb_tot_var	Total aerosol Sb sample concentration variance.	ng/m^3	no_bcodmo_term
Sb_tot_flag	Total aerosol Sb concnetration data quality flag.	unitless	no_bcodmo_term
Cs_tot	Total aerosol Cs (Caesium) concentration.	ng/m^3	metal_conc_air
Cs_tot_avg	Total aerosol Cs average sample concentration.	ng/m^3	no_bcodmo_term
Cs_tot_var	Total aerosol Cs sample concentration variance.	ng/m^3	no_bcodmo_term
Cs_tot_flag	Total aerosol Cs concnetration data quality flag.	unitless	no_bcodmo_term
Ba_tot	Total aerosol Ba (Barium) concentration.	ng/m^3	metal_conc_air
Ba_tot_avg	Total aerosol Ba average sample concentration.	ng/m^3	no_bcodmo_term
Ba_tot_var	Total aerosol Ba sample concentration variance.	ng/m^3	no_bcodmo_term
Ba_tot_flag	Total aerosol Ba concnetration data quality flag.	unitless	no_bcodmo_term
La_tot	Total aerosol La (Lanthanum) concentration.	ng/m^3	metal_conc_air
La_tot_avg	Total aerosol La average sample concentration.	ng/m^3	no_bcodmo_term
La_tot_var	Total aerosol La sample concentration variance.	ng/m^3	no_bcodmo_term
La_tot_flag	Total aerosol La concnetration data quality flag.	unitless	no_bcodmo_term
Ce_tot	Total aerosol Ce (Cerium) concentration.	ng/m^3	metal_conc_air
Ce_tot_avg	Total aerosol Ce average sample concentration.	ng/m^3	no_bcodmo_term
Ce_tot_var	Total aerosol Ce sample concentration variance.	ng/m^3	no_bcodmo_term
Ce_tot_flag	Total aerosol Ce concnetration data quality flag.	unitless	no_bcodmo_term
Nd_tot	Total aerosol Nd (Neodymium) concentration.	ng/m^3	metal_conc_air
Nd_tot_avg	Total aerosol Nd average sample concentration.	ng/m^3	no_bcodmo_term
Nd_tot_var	Total aerosol Nd sample concentration variance.	ng/m^3	no_bcodmo_term
Nd_tot_flag	Total aerosol Nd concnetration data quality flag.	unitless	no_bcodmo_term
Pb_tot	Total aerosol Pb (Lead) concentration.	ng/m^3	metal_conc_air
Pb_tot_avg	Total aerosol Pb average sample concentration.	ng/m^3	no_bcodmo_term
Pb_tot_var	Total aerosol Pb sample concentration variance.	ng/m^3	no_bcodmo_term
Pb_tot_flag	Total aerosol Pb concnetration data quality flag.	unitless	no_bcodmo_term
Th_tot	Total aerosol Th (Thorium) concentration.	ng/m^3	metal_conc_air
Th_tot_avg	Total aerosol Th average sample concentration.	ng/m^3	no_bcodmo_term
Th_tot_var	Total aerosol Th sample concentration variance.	ng/m^3	no_bcodmo_term
Th_tot_flag	Total aerosol Th concnetration data quality flag.	unitless	no_bcodmo_term
U_tot	Total aerosol U (Uranium) concentration.	ng/m^3	metal_conc_air
U_tot_avg	Total aerosol U average sample concentration.	ng/m^3	no_bcodmo_term
U_tot_var	Total aerosol U sample concentration variance.	ng/m^3	no_bcodmo_term
U_tot_flag	Total aerosol U concnetration data quality flag.	unitless	no_bcodmo_term
station_GEOTRC	GEOTRACES station number; ranges from 1 through 12 for KN199-04 and 1 through 24 for KN204-01. Stations 7 and 9 were skipped on KN204-01. Some GeoFish stations are denoted as X_to_Y indicating the tow occurred between stations X and Y. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	dimensionless	station
event_GEOTRC	Unique identifying number for US GEOTRACES sampling events; ranges from 2001 to 2225 for KN199-04 events and from 3001 to 3282 for KN204-01 events. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	dimensionless	event
ISO_DateTime_UTC_start	Date and time (UTC) formatted to ISO 8601 standard. Calculated from starting date and time provided.	YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]	ISO_DateTime_UTC
ISO_DateTime_UTC_end	Date and time (UTC) formatted to ISO 8601 standard. Calculated from ending date and time provided.	YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]	ISO_DateTime_UTC

Database

Contribute Data

Dataset: GT10-11 - Trace Metals Aerosol
Deployment: KN204-01

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: GT10-11 - Trace Metals AerosolDeployment: KN204-01

Dataset acquisition description

Dataset Processing Description

Dataset: GT10-11 - Trace Metals Aerosol
Deployment: KN204-01