Dataset: GP15 SMLH2O Aerosol Ions Leg 1

Name: Concentrations of deionized water-soluble aerosol major ions from bulk aerosol samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from Sept-Oct 2018
Published: 2022-06-21
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.875955.1

Spatial Extent: N:55.5948 E:-129.0395 S:22 W:-156.3461

Temporal Extent: 2018-09-20 - 2018-10-20

Project:

Collaborative Research: US GEOTRACES PMT: Quantification of Atmospheric Deposition and Trace Element Fractional Solubility (PMT Aerosol Collection)

US GEOTRACES Pacific Meridional Transect (GP15) (U.S. GEOTRACES PMT)

Program:

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

Principal Investigator:

Clifton S. Buck (Skidaway Institute of Oceanography, SkIO)

Co-Principal Investigator:

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

Scientist:

Christopher Marsay (Skidaway Institute of Oceanography, SkIO)

Devon Umstead (Skidaway Institute of Oceanography, SkIO)

BCO-DMO Data Manager:

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

Version:

Version Date:

2022-06-21

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Concentrations of deionized water-soluble aerosol major ions from bulk aerosol samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from Sept-Oct 2018

Abstract:

This dataset reports the concentrations of deionized water-soluble aerosol major ions determined from bulk aerosol samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2022-06-21	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.875955.1	2022-07-08

Methods & Sampling

A total of 12 48-hour integrated aerosol samples were collected during Leg 1 of the US GEOTRACES Pacific Meridional Transect research cruise (GP15), which took place on the RV Revelle (cruise RR1814) during September-October 2018. The cruise track consisted of a southward transect across the North Pacific Ocean originating off of Alaska and terminating at Hawaii. See attached Supplemental File of sample locations (.png).

Bulk aerosol samples for major ion analyses were collected using one of five Tisch Environmental high-volume (~1 m³ air min⁻¹) aerosol samplers (model 5170V-BL). For each deployment, 12 replicate 47 mm diameter Whatman 41 filters were loaded on open-face filter holders (Advantec MFS) installed on the aerosol sampler on a PVC adaptor plate (Shelley et al., 2015). Filters were acid-washed before use to reduce trace element blanks, following the procedure described by Morton et al. (2013). The samplers were deployed on the forward rail of the ship’s 03 deck approximately 16m above sea level, to minimize the influence of sea spray on samples. Samplers were controlled by wind speed and direction, through a Campbell Scientific CR800 data-logger interfaced with an anemometer and wind vane set up in close proximity to the samplers, in order to eliminate contamination from the ship’s stack exhaust. This setup was used to restrict sampling to periods when relative wind speed and direction were >0.5 m s⁻¹ and from within ±60° of the bow of the ship, respectively, for at least five continuous minutes.

Following sampling, the filters were transfer to pre-labeled petri slides. A set of filters from each deployment were "instantaneously" leached with ultrahigh purity (>18 MΩ∙cm; UHP) water according to the methods in previous studies (Buck et al., 2006; Morton et al., 2013). Other filters were transferred to petri-slides and stored frozen until trace element processing back on land. Approximately 30 mL from each leach was collected in an LDPE bottle to serve as a subsample to be analyzed for major ions. This subsample was stored frozen in a commercial freezer until analysis.

The concentration of the major cations and anions were analyzed by ion chromatography (IC) on a Dionex ICS-2100 instrument. The concentrations of the ions were calculated by linear regression of the system response to a series of standards of known concentration. Analytical accuracy was confirmed by regular analysis of check standards. All standards were made with ACS certified salts in UHP. Ion concentrations for each collection were normalized to pmol m-3 by dividing by the volume of air sampled.

Data Processing Description

Data Processing:
Filter blanks were processed in the same way as samples but were below method detection limits. Reported soluble aerosol major ion concentrations values have been normalized to the volume of air filtered during sample collection. Each sample collection period produced 36 replicate filters. Three of those filters were leached with ultrapure deionized water (DI water) and a subsample from one of these for each deployment was analyzed for major ion concentrations. To assess measurement precision, a subset of samples were analyzed multiple times, from which a relative standard deviation was determined for each major ion species. The standard deviations in the datasheet represent application of these RSDs to all samples. Detection limits are defined as three times the standard deviation from replicate analyses of low concentration samples. Data are marked as described in the datasheet.

Known Problems/Issues:
AEROS2 (Event 6546) was not analyzed due to exceptional contamination of the collection filters with sea spray.
The K+ data were frequently below method detection limit.

Quality Flags:
Quality flags have been applied with the following definitions:
0 = No quality control;
1 = Good value;
2 = Probably good value;
3 = Probably bad value;
4 = Bad value;
5 = Value changed;
6 = Value Below Detection;
7 = Value in excess;
8 = Interpolated value;
9 = Missing value.

Detection Limits:
Detection limit used is 3xSD of triplicate analyses of the lowest measurable sample. All filter blanks were below detection limit for all major ions. Reported detection limits were not normalized by air volume and sample data were evaluated relative to the method detection limit prior to the normalization step in data processing. Data below the detection limit are flagged with code 6 and no value reported ("nd"). Detection limits are reported in the attached Supplemental File (PDF).

Note on Standard Deviations:
Only one major ion sample generated per aerosol deployment. A handful of samples were analyzed multiple times, from which a relative standard deviation (%) for each chemical species was determined and this was applied to all values.

BCO-DMO Processing:
- renamed fields;
- added date/time fields in ISO8601 format and removed original day, month, year, and time columns.

Data Files

File
SMLH2O_Aerosol_Ions_Leg1.csv (Comma Separated Values (.csv), 2.91 KB) MD5:35d513e6fdc849db780e3d166412a046 Primary data file for dataset ID 875955

Supplemental Files

File
GP15_SMLH2O_Aerosol_Ions_Leg1_Aerosol_Sample_Map.png (Portable Network Graphics (.png), 73.10 KB) MD5:28f24a7f40b00ff86d7c562d49240f2a Map (image) of aerosol sample locations for dataset 875955, "GP15 SMLH2O Aerosol Ions Leg 1".
GP15_SMLH2O_Aerosol_Ions_Leg1_Detection_Limits.pdf (Portable Document Format (.pdf), 380.94 KB) MD5:235093212f1bb911509105cc93b1ad5a Table of detection limits for each element reported in Clifton Buck's GP15 SMLH2O Aerosol Ions Leg 1 dataset.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1756103
NSF Division of Ocean Sciences	OCE-1756104

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR1814	GP15 GP15 Leg1 33RR20180918 PMT US GEOTRACES PMT	2018-09-18	R/V Roger Revelle	Gregory A. Cutter (Chief Scientist) Karen L. Casciotti (Co-Chief Scientist) Phoebe J. Lam (Co-Chief Scientist)	data info

Instruments

Aerosol Sampler

Supplied Name: Tisch Environmental high-volume (~1 m3 air min-1) aerosol samplers (model 5170V-BL)

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.

Anemometer

Supplied Name: 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.

Data Logger

Supplied Name: Campbell Scientific CR800 data-logger

Supplied Description:

Instrument Type

Generic Name: Data Logger

Generic Description:

Electronic devices that record data over time or in relation to location either with a built-in instrument or sensor or via external instruments and sensors.

Ion Chromatograph

Supplied Name: Dionex ICS-2100 ion chromatography system

Supplied Description:

Instrument Type

Generic Name: Ion Chromatograph

Generic Description:

Ion chromatography is a form of liquid chromatography that measures concentrations of ionic species by separating them based on their interaction with a resin. Ionic species separate differently depending on species type and size. Ion chromatographs are able to measure concentrations of major anions, such as fluoride, chloride, nitrate, nitrite, and sulfate, as well as major cations such as lithium, sodium, ammonium, potassium, calcium, and magnesium in the parts-per-billion (ppb) range. (from http://serc.carleton.edu/microbelife/research_methods/biogeochemical/ic.html)

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise_id	Cruise identifier	unitless	cruise_id
GEOTRC_EVENTNO	GEOTRACES Event Number	unitless	event
GEOTRC_SAMPNO	GEOTRACES Sample Number	unitless	sample
Aerosol_deployment_number	Aerosols-specific sample number (see included map)	unitless	deploy
Start_ISO_DateTime_UTC	Date and time (UTC) at start of sample collection; formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Julian_Day	Sampling start Julian day	unitless	julian_day
Start_Lat	Latitude at start of sample collection	degrees North	lat
Start_Long	Longitude at start of sample collection	degrees East	lon
End_ISO_DateTime_UTC	Date and time (UTC) at end of sample collection; formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
End_Lat	Latitude at end of sample collection	degrees North	lat
End_Long	Longitude at end of sample collection	degrees East	lon
Air_Vol_Total	Total volume of air sampled per filter	cubic meters (m^3)	sample_volume
Na_A_SMLH2O_CONC_HIVOL_xug0hs	Deionized water soluble aerosol Na concentration	picomoles per cubic meter (pmol/m^3)	Na
SD1_Na_A_SMLH2O_CONC_HIVOL_xug0hs	Relative standard deviation of Na_A_SMLH2O_CONC_HIVOL_xug0hs	unitless	Na
Flag_Na_A_SMLH2O_CONC_HIVOL_xug0hs	Quality flag for Na_A_SMLH2O_CONC_HIVOL_xug0hs	unitless	q_flag
Mg_A_SMLH2O_CONC_HIVOL_jp5vib	Deionized water soluble aerosol Mg concentration	picomoles per cubic meter (pmol/m^3)	Mg
SD1_Mg_A_SMLH2O_CONC_HIVOL_jp5vib	Relative standard deviation of Mg_A_SMLH2O_CONC_HIVOL_jp5vib	unitless	Mg
Flag_Mg_A_SMLH2O_CONC_HIVOL_jp5vib	Quality flag for Mg_A_SMLH2O_CONC_HIVOL_jp5vib	unitless	q_flag
K_A_SMLH2O_CONC_HIVOL_rvayjm	Deionized water soluble aerosol K concentration	picomoles per cubic meter (pmol/m^3)	K
SD1_K_A_SMLH2O_CONC_HIVOL_rvayjm	Relative standard deviation of K_A_SMLH2O_CONC_HIVOL_rvayjm	unitless	K
Flag_K_A_SMLH2O_CONC_HIVOL_rvayjm	Quality flag for K_A_SMLH2O_CONC_HIVOL_rvayjm	unitless	q_flag
Ca_A_SMLH2O_CONC_HIVOL_ee0sfi	Deionized water soluble aerosol Ca concentration	picomoles per cubic meter (pmol/m^3)	Ca
SD1_Ca_A_SMLH2O_CONC_HIVOL_ee0sfi	Relative standard deviation of Ca_A_SMLH2O_CONC_HIVOL_ee0sfi	unitless	Ca
Flag_Ca_A_SMLH2O_CONC_HIVOL_ee0sfi	Quality flag for Ca_A_SMLH2O_CONC_HIVOL_ee0sfi	unitless	q_flag
Cl_A_SMLH2O_CONC_HIVOL_dimboe	Deionized water soluble aerosol Cl concentration	picomoles per cubic meter (pmol/m^3)	Cl
SD1_Cl_A_SMLH2O_CONC_HIVOL_dimboe	Relative standard deviation of Cl_A_SMLH2O_CONC_HIVOL_dimboe	unitless	Cl
Flag_Cl_A_SMLH2O_CONC_HIVOL_dimboe	Quality flag for Cl_A_SMLH2O_CONC_HIVOL_dimboe	unitless	q_flag
SO4_A_SMLH2O_CONC_HIVOL_qi3kyv	Deionized water soluble aerosol SO4 concentration	picomoles per cubic meter (pmol/m^3)	SO4
SD1_SO4_A_SMLH2O_CONC_HIVOL_qi3kyv	Relative standard deviation of SO4_A_SMLH2O_CONC_HIVOL_qi3kyv	unitless	SO4
Flag_SO4_A_SMLH2O_CONC_HIVOL_qi3kyv	Quality flag for SO4_A_SMLH2O_CONC_HIVOL_qi3kyv	unitless	q_flag
NO3_A_SMLH2O_CONC_HIVOL_twuzpl	Deionized water soluble aerosol NO3 concentration	picomoles per cubic meter (pmol/m^3)	NO3
SD1_NO3_A_SMLH2O_CONC_HIVOL_twuzpl	Relative standard deviation of NO3_A_SMLH2O_CONC_HIVOL_twuzpl	unitless	NO3
Flag_NO3_A_SMLH2O_CONC_HIVOL_twuzpl	Quality flag for NO3_A_SMLH2O_CONC_HIVOL_twuzpl	unitless	q_flag

Database

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Dataset: GP15 SMLH2O Aerosol Ions Leg 1