Index of /arm-iop-file/2022/ena/agena/bertram-ptrms-gcms

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[ ]ARM0740.ReadMe_ARMSubmission_GCVocus_20230404.20230416_13_04_140.docx2023-04-24 14:55 22K 
[TXT]ARM0740.RTVocus_R1.20230416_13_04_145.csv2023-04-24 14:55 2.4M 
[TXT]ARM0740.GCIsoprene_R1.20230416_13_04_160.csv2023-04-24 14:55 5.2K 

VOC Measurements Eastern North Atlantic June-July 2022

Overview:

Six weeks of continuous, high time resolution measurements of volatile organic compounds (VOCs) were made by a proton transfer reaction mass spectrometer with a coupled gas chromatography (GC) front-end at the ARM Eastern North Atlantic site during the Aerosol Growth in the Eastern North Atlantic campaign. We report the time series of 12 molecules in parts per trillion at 5 minute averaging time as well as isoprene from GC samples. Molecules include both biogenic and anthropogenic species that contribute to the total measured VOC at the site. 

Metadata Creator:
Name: Delaney Kilgour
Email: dkilgour@wisc.edu Phone: 8186697882
Street: City:
State: Postal:
Contact Info:
Name: Timothy Bertram
Email: timothy.bertram@wisc.edu Phone:
Street: City:
State: Postal:
Investigator(s): Delaney Kilgour (dkilgour@wisc.edu) 0000000204359665
Christopher Jernigan (chris.jernigan@noaa.gov) 0000000303025222
Timothy Bertram (timothy.bertram@wisc.edu) 0000000230267588
Data Citation:https://doi.org/10.5439/1969882
Data Format:csv
Abstract:

Six weeks of continuous, high time resolution measurements of volatile organic compounds (VOCs) were made by a proton transfer reaction mass spectrometer with a coupled gas chromatography (GC) front-end at the ARM Eastern North Atlantic site during the Aerosol Growth in the Eastern North Atlantic campaign. We report the time series of 12 molecules in parts per trillion at 5 minute averaging time as well as isoprene from GC samples. Molecules include both biogenic and anthropogenic species that contribute to the total measured VOC at the site. 
Purpose:

The purpose of this dataset is to inform our understanding of the sources, composition, and concentration of volatile organic compounds measured at the ARM Eastern North Atlantic site. 
Data Usage:All molecules are reported in parts per trillion. Isoprene is reported from in situ GC PTR-MS measurements collected sporadically (2-4x/day). All other molecules are reported at a 5 minute averaging time. All data is background-subtracted. Time points when the ambient data was not above background are left as negative. Time points when no ambient data exists for a molecule are NaN. Data of individual molecules can be used for time series or used to determine average concentration of the molecule at the site during the study period. Data should not be used to determine the contribution of a particular molecule to the total reported VOC measured at the site. All 5 minute averaged VOC data should be used in conjunction with the provided flags to filter out periods of pollution. There are two equivalent time stamps – one is in Matlab serial time for the data to be easily read into matlab and the other is in fractional day of year, both local time at the site.
Data Credit:The AGENA project was supported by a grant from DOE ASR and was supported by ARM (AFC010011).
Arm Sites: ena
Content Time Range: Begin: 2022-06-01 End: 2022-07-15
Instrument(s):Proton Transfer Reaction Mass Spectrometer
Gas Chromatography Mass Spectrometry
Data Type:Aerosol Growth in the Eastern North Atlantic
Scientific Measurements(s):
Measurement nameVariables
VOC measured by Real Time Vocus PTR-MSDatenum
DOY
DMS
Acetonitrile
Ethanol
Acetone
Benzene
MeSH
MeOH
SumMT
SumC4H6O
SumC4H8O
SumC8H10
SumC9H12
Poll_Flag
Grass_Flag
Isoprene measured by GC-Vocus PTR-MSDatenum
DOY
Volume_cm3
Isoprene
Stratum Keyword(s):
volatile organic compound, dimethyl sulfide, marine boundary layer, secondary marine aerosol, new particle formation
Data Quality:
Attribute Accuracy: Uncertainties for all reported molecules are based on the uncertainty in the calibration standard. This is most commonly +/- 5% and up to +/- 10%.
Positional Accuracy: No formal positional accuracy tests were conducted.
Consistency and Completeness Report: Time points when the ambient data was not above background are left as negative. Time points when no ambient data exists (instrument offline, collecting GCs, zeroing, or calibrating) for a molecule are NaN. Time points that did not pass QA/QC due to documented contamination are NaN.
Factor Affecting the Research: All data should be interpreted in the context of existing ARM measurements at the site for weather or cloudiness conditions. The site is affected by local pollution, often due to the airport runway next to the site, in addition to cars driving on the road on the other side of the site. Data should be interpreted in the context of the flags for pollution and grass-cutting. The pollution flag assumes that any time points when the VOC C7, C8, and C9 aromatics are above baseline is indicative of local pollution. Pollution flag might continue to be revised and reuploaded until data can be utilized by non-AGENA people in summer 2024.
Access Restriction: No access constraints are associated with this data.
Use Restrictions: Anyone accessing or using the data (including for proposals, presentations, or publications) must contact authors prior to access and use. Data cannot be utilized for proposals, presentations, or publications by anyone not involved in the AGENA study until summer 2024.
Distribution Info:
Organization Name: ARM Archive User Services
Email: armarchive[at]ornl.gov Phone: 1-888-ARM-DATA
Street: Oak Ridge National Laboratory City: Oak Ridge
State: Tennessee Postal: 37831-6290
Additional Missing Info: A readme is included for the dataset, called ReadMe_ARMSubmission_GCVocus_20230404.