Simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research

<p>Capturing the vertical profiles and horizontal variations of atmospheric aerosols often requires accurate airborne measurements. With the advantage of avoiding health and safety concerns related to the use of butanol or other chemicals, water-based condensation particle counters have emerge...

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Autores principales:	F. Mei, S. Spielman, S. Hering, J. Wang, M. S. Pekour, G. Lewis, B. Schmid, J. Tomlinson, M. Havlicek
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Environmental engineering TA170-171 Earthwork. Foundations TA715-787
Acceso en línea:	https://doaj.org/article/1051603a010e426ba65558eef2a192c8
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spelling	oai:doaj.org-article:1051603a010e426ba65558eef2a192c82021-11-23T06:38:05ZSimulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research10.5194/amt-14-7329-20211867-13811867-8548https://doaj.org/article/1051603a010e426ba65558eef2a192c82021-11-01T00:00:00Zhttps://amt.copernicus.org/articles/14/7329/2021/amt-14-7329-2021.pdfhttps://doaj.org/toc/1867-1381https://doaj.org/toc/1867-8548<p>Capturing the vertical profiles and horizontal variations of atmospheric aerosols often requires accurate airborne measurements. With the advantage of avoiding health and safety concerns related to the use of butanol or other chemicals, water-based condensation particle counters have emerged to provide measurements under various environments. However, airborne deployments are relatively rare due to the lack of instrument characterization under reduced pressure at flight altitudes. This study investigates the performance of a commercial “versatile” water-based condensation particle counter (vWCPC, model 3789, TSI, Shoreview, MN, USA) under various ambient pressure conditions (500–920 hPa) with a wide range of particle total number concentrations (1500–70 000 cm<span class="inline-formula"><sup>−3</sup></span>). The effect of conditioner temperature on vWCPC 3789 performance at low pressure is examined through numerical simulation and laboratory experiments. We show that the default instrument temperature setting of 30 <span class="inline-formula"><sup>∘</sup></span>C for the conditioner is not suitable for airborne measurement and that the optimal conditioner temperature for low-pressure operation is 27<span class="inline-formula"><sup>∘</sup></span>. Under the optimal conditioner temperature (27<span class="inline-formula"><sup>∘</sup></span>), the 7 nm cut-off size is also maintained. Additionally, we show that insufficient droplet growth becomes more significant under the low-pressure operation. The counting efficiency of the vWCPC 3789 can vary up to 20 % for particles of different chemical compositions (e.g., ammonium sulfate and sucrose particles). However, such variation is independent of pressure.</p>F. MeiS. SpielmanS. HeringJ. WangM. S. PekourG. LewisB. SchmidJ. TomlinsonM. HavlicekCopernicus PublicationsarticleEnvironmental engineeringTA170-171Earthwork. FoundationsTA715-787ENAtmospheric Measurement Techniques, Vol 14, Pp 7329-7340 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Environmental engineering TA170-171 Earthwork. Foundations TA715-787
spellingShingle	Environmental engineering TA170-171 Earthwork. Foundations TA715-787 F. Mei S. Spielman S. Hering J. Wang M. S. Pekour G. Lewis B. Schmid J. Tomlinson M. Havlicek Simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research
description	<p>Capturing the vertical profiles and horizontal variations of atmospheric aerosols often requires accurate airborne measurements. With the advantage of avoiding health and safety concerns related to the use of butanol or other chemicals, water-based condensation particle counters have emerged to provide measurements under various environments. However, airborne deployments are relatively rare due to the lack of instrument characterization under reduced pressure at flight altitudes. This study investigates the performance of a commercial “versatile” water-based condensation particle counter (vWCPC, model 3789, TSI, Shoreview, MN, USA) under various ambient pressure conditions (500–920 hPa) with a wide range of particle total number concentrations (1500–70 000 cm<span class="inline-formula"><sup>−3</sup></span>). The effect of conditioner temperature on vWCPC 3789 performance at low pressure is examined through numerical simulation and laboratory experiments. We show that the default instrument temperature setting of 30 <span class="inline-formula"><sup>∘</sup></span>C for the conditioner is not suitable for airborne measurement and that the optimal conditioner temperature for low-pressure operation is 27<span class="inline-formula"><sup>∘</sup></span>. Under the optimal conditioner temperature (27<span class="inline-formula"><sup>∘</sup></span>), the 7 nm cut-off size is also maintained. Additionally, we show that insufficient droplet growth becomes more significant under the low-pressure operation. The counting efficiency of the vWCPC 3789 can vary up to 20 % for particles of different chemical compositions (e.g., ammonium sulfate and sucrose particles). However, such variation is independent of pressure.</p>
format	article
author	F. Mei S. Spielman S. Hering J. Wang M. S. Pekour G. Lewis B. Schmid J. Tomlinson M. Havlicek
author_facet	F. Mei S. Spielman S. Hering J. Wang M. S. Pekour G. Lewis B. Schmid J. Tomlinson M. Havlicek
author_sort	F. Mei
title	Simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research
title_short	Simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research
title_full	Simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research
title_fullStr	Simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research
title_full_unstemmed	Simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research
title_sort	simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/1051603a010e426ba65558eef2a192c8
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Simulation-aided characterization of a versatile water-based condensation particle counter for atmospheric airborne research

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