Dataset Edition
| Présentation générale | |||
|---|---|---|---|
| Nom du jeu de données | AEROCLO-sA PEGASUS PTR-MS volatile organic compounds | ||
| DOI | 10.6096/AEROCLO.1773 | ||
| Créé le | 2018-07-20 | ||
| Projet(s) | AEROCLO | ||
| Date de début (yyyy-mm-dd) | 2017-08-21 | Date de fin (yyyy-mm-dd) | 2017-09-12 |
| Contact(s) | |||
| Accès aux données |  Dataset as provided by the Principal Investigator | ||
| History | ISSUE2020-04-02 | ||
| Description du jeu de données | |||
| Résumé | The concentration of volatile organic compounds was measured by a proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS) Kore Inc™ (second generation) operated in the PEGASUS mobile lab. Air was taken into the instrument through a 1.5 m long Silcosteel® coated stainless steel tube (2.1 mm inner diameter), at a constant flow rate of about 3 cm3/s . Instrumental settings were: glow discharge region P=2.00 mbar, proton transfer reaction tube P=1.69 mbar, T=60 °C and E=390 V, leading to an E/N of 112 Td (1 Td=10−17 V cm2). List of gas standard mixtures used for calibration: (i) built-in GCU gas standard containing formaldehyde, methanol, acetonitrile, acetaldehyde, ethanol, acrolein, acetone, isoprene, crotonaldehyde, 2-butanone, benzene, toluene, o-xylene, chlorobenzene, α-pinene, 1,2-dichlorobenzene, and 1,2,4-trichlorobenzene at a nominal concentration of 1 ppm; (ii) NPL primary reference gas mixture containing ethane, ethene, propane, propene, 2-methylpropane, butane, ethyne, trans-but-2-ene, but-1-ene, cis-but-2-ene, 2-methylbutane, pentane, 1,3-butadiene, trans-pent-2-ene, pent-1-ene, 2-methylpentane, hexane, isoprene, heptane, benzene, 2,2,4-trimethylpentane, octane, toluene, ethylbenzene, m-xylene, p-xylene, o-xylene, 1,3,5-trimetrylbenzene, 1,2,4-trimethylbenzene, and 1,2,3-trimethylbenzene at a nominal concentration of 4 ppb; (iii) standard mixture made in-house containing dimethyl sulphide (DMS, 1.39 ppm), dimethyl sulfoxide (DMSO, 1.34 ppm), diethyl sulphide (DES, 2.03 ppm), dimethyl disulphide (DMDS, 1.7 ppm) and dimethyl sulphate (DMSO4, 1.79 ppm). | ||
| Strategie d'observation | Data acquisition was done with 5-min resolution and blank spectra were recorded three-times per day using zero-air. Calibration of instrumental signals was performed every three days using three different gas standard mixtures containing hydrocarbons, oxygenated hydrocarbons and sulphurated hydrocarbons in the concentration range between 0.3 ppb and 1 ppm at 70% RH and 25 °C. | ||
| Références | References for quantification formulas and k used are: Bohme, D.K., Mackay, G.I., Tanner, S.D., 1979. An experimental study of the gas-phase kinetics of reactions with hydrated hydronium(1+) ions(n = 1-3) at 298 K. J. Am. Chem. Soc. 101, 3724–3730. https://doi.org/10.1021/ja00508a003 Ellis, A.M., Mayhew, C.A., 2014. Proton Transfer Reaction Mass Spectrometry: Principles and Applications. John Wiley & Sons, Ltd., Chichester, England. Zhao, J., Zhang, R., 2004. Proton transfer reaction rate constants between hydronium ion (H3O+) and volatile organic compounds. Atmos. Environ. 38, 2177–2185. https://doi.org/10.1016/j.atmosenv.2004.01.019 | ||
| Description de l'instrument | |||
| Type d'instrument | In Situ/Laboratory Instruments > Samplers | ||
| Fabricant | Kore | ||
| Observation frequency | 5 minutes | ||
| Horizontal coverage | Point measurement | ||
| Longitude (°) | -22.1 | Latitude (°) | 14.5 |
| Height above ground (m) | 2 | ||
| Information géographique | |||
| Site 1 | |||
| Mot-clé de localistion | CONTINENT > AFRICA > SOUTHERN AFRICA > NAMIBIA | ||
| Site | Henties Bay | ||
| Type de plateforme | In Situ Land-based Platforms > GROUND STATIONS | ||
| Instrument environment | The instrument was located inside the PEGASUS mobile station. PEGASUS was installed at the Sam Nujoma Marine and Coastal Resources Research Centre (SANUMARC) of the University of Namibia in Henties Bay (22°S, 14°05’E), Namibia. Henties Bay is a small town in an arid environment with no vegetation, no industrial activity and very little traffic. Energy usage is predominantly a mix of electricity and gas, with some solid fuel combustion (wood) due to low availability. The site on the University campus, is located on the coast approximately 20 m from the shore line. To the east are the Namibian Gravel Plains, at 3 km to the south of the campus is the town of Henties Bay, and to the north is the Omaruru Riverbed (river mouth approximately 100 m from SANUMARC). The population of Henties Bay ranges between 4 600 and 6 000 inhabitants, according to the Namibia 2011 population and housing census. | ||
| Paramètres mesurés | |||
| Paramètre mesuré 1 | |||
| Nom du paramètre | Non-methane Hydrocarbons/Volatile Organic Compounds | ||
| Mot-clé du paramètre | Atmosphere > Atmospheric Chemistry > Carbon and Hydrocarbon Compounds > Non-methane Hydrocarbons/Volatile Organic Compounds | ||
| Unité | part per billion - ppb | ||
| Méthodologie d'acquisition et qualité | The concentration of volatile organic compounds was measured by a proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS) Kore Inc™ (second generation) operated in the PEGASUS mobile lab. Air was taken into the instrument through a 1.5 m long Teflon tubing to a 6-port manifold common for all gaz phase measurements. From the manifold, a Silcosteel® coated stainless steel tube (2.1 mm inner diameter) was connected to the instrument and brought air at a constant flow rate of about 3 cm3/s . Instrumental settings were: glow discharge region P=2.00 mbar, proton transfer reaction tube P=1.69 mbar, T=60 °C and E=390 V, leading to an E/N of 112 Td (1 Td=10−17 V cm2). Data acquisition was done with 5-min resolution and blank spectra were recorded three-times per day using zero-air. Calibration of instrumental signals was performed every three days using three different gas standard mixtures containing hydrocarbons, oxygenated hydrocarbons and sulphurated hydrocarbons in the concentration range between 0.3 ppb and 1 ppm at 70% RH and 25 °C. List of gas standard mixtures used for calibration: (i) built-in GCU gas standard containing formaldehyde, methanol, acetonitrile, acetaldehyde, ethanol, acrolein, acetone, isoprene, crotonaldehyde, 2-butanone, benzene, toluene, o-xylene, chlorobenzene, α-pinene, 1,2-dichlorobenzene, and 1,2,4-trichlorobenzene at a nominal concentration of 1 ppm; (ii) NPL primary reference gas mixture containing ethane, ethene, propane, propene, 2-methylpropane, butane, ethyne, trans-but-2-ene, but-1-ene, cis-but-2-ene, 2-methylbutane, pentane, 1,3-butadiene, trans-pent-2-ene, pent-1-ene, 2-methylpentane, hexane, isoprene, heptane, benzene, 2,2,4-trimethylpentane, octane, toluene, ethylbenzene, m-xylene, p-xylene, o-xylene, 1,3,5-trimetrylbenzene, 1,2,4-trimethylbenzene, and 1,2,3-trimethylbenzene at a nominal concentration of 4 ppb; (iii) standard mixture made in-house containing dimethyl sulphide (DMS, 1.39 ppm), dimethyl sulfoxide (DMSO, 1.34 ppm), diethyl sulphide (DES, 2.03 ppm), dimethyl disulphide (DMDS, 1.7 ppm) and dimethyl sulphate (DMSO4, 1.79 ppm). | ||
| Date de début (yyyy-mm-dd) | 2017-08-21 | Date de fin (yyyy-mm-dd) | 2017-09-12 |
| Précision du capteur / Incertitude | see excel file | ||
| Derived parameter 1 | |||
| Nom du paramètre | Atmosphere | ||
| Mot-clé du paramètre | Atmosphere | ||
| Unité | cm-3 | ||
| Date de début (yyyy-mm-dd) | Date de fin (yyyy-mm-dd) | ||
| Précision du capteur / Incertitude | |||
| Information sur l'utilisation des données | |||
| Conditions d'utilisation des données | The Principal Investigator(s) of the PTR-MS data for the AEROCLO-sA campaign are Chiara Giorio (chiara.giorio@atm.ch.cam.ac.uk) and Jean-François Doussin (jean-francois.doussin@lisa.ipsl.fr). Please contact the PIs whenever using the data for publications or presentations. Data were acquired with the support of Mathieu Cazaunau (LISA) and of the Technical Department of the LISA. The LISA (www.lisa.u-pec.fr) is a joint research unit of the CNRS, University Paris-Est Créteil and University of Paris). | ||
| Charte d'accès aux données | AEROCLO data policy | ||
| Base de données | AEROCLO-sA on BAOBAB | ||
| Format des fichiers de données | Excel | ||
