Effect of polyoxymethylene (POM-H Delrin) off-gassing within the Pandora head sensor on direct-sun and multi-axis formaldehyde column measurements in 2016-2019

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dc.contributor.authorSpinei, Elenaen
dc.contributor.authorTiefengraber, Martinen
dc.contributor.authorMueller, Moritzen
dc.contributor.authorGebetsberger, Manuelen
dc.contributor.authorCede, Alexanderen
dc.contributor.authorValin, Lukeen
dc.contributor.authorSzykman, Jamesen
dc.contributor.authorWhitehill, Andrewen
dc.contributor.authorKotsakis, Alexanderen
dc.contributor.authorSantos, Fernandoen
dc.contributor.authorAbbuhasan, Naderen
dc.contributor.authorZhao, Xiaoyien
dc.contributor.authorFioletov, Vitalien
dc.contributor.authorLee, Sum Chien
dc.contributor.authorSwap, Roberten
dc.contributor.departmentCenter for Space Science and Engineering Researchen
dc.date.accessioned2021-05-28T14:40:59Zen
dc.date.available2021-05-28T14:40:59Zen
dc.date.issued2021-01-28en
dc.description.abstractAnalysis of formaldehyde measurements by the Pandora spectrometer systems between 2016 and 2019 suggested that there was a temperature-dependent process inside the Pandora head sensor that emitted formaldehyde. Some parts in the head sensor were manufactured from the thermal plastic polyoxymethylene homopolymer (E.I. Du Pont de Nemour & Co., USA; POM-H Delrin (R)) and were responsible for formaldehyde production. Laboratory analysis of the four Pandora head sensors showed that internal formaldehyde production had exponential temperature dependence with a damping coefficient of 0.0911 +/- 0.0024 degrees C-1 and the exponential function amplitude ranging from 0.0041 to 0.049 DU. No apparent dependency on the head sensor age and heating and cooling rates was detected. The total amount of formaldehyde internally generated by the POM-H Delrin components and contributing to the direct-sun measurements were estimated based on the head sensor temperature and solar zenith angle of the measurements. Measurements in winter, during colder (< 10 degrees C) days in general, and at high solar zenith angles (> 75 degrees) were minimally impacted. Measurements during hot days (> 28 degrees C) and small solar zenith angles had up to 1 DU (2.69 x 10(16 )molec. cm(-2)) contribution from POM-H Delrin parts. Multi-axis differential slant column densities were minimally impacted (< 0.01 DU) due to the reference spectrum being collected within a short time period with a small difference in head sensor temperature. Three new POM-H Delrin free Pandora head sensors (manufactured in summer 2019) were evaluated for temperature-dependent attenuation across the entire spectral range (300 to 530 nm). No formaldehyde absorption or any other absorption above the instrumental noise was observed across the entire spectral range.en
dc.description.sponsorshipIntramural EPA [EPA999999] Funding Source: Medlineen
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.5194/amt-14-647-2021en
dc.identifier.eissn1867-8548en
dc.identifier.issn1867-1381en
dc.identifier.issue1en
dc.identifier.pmid33643474en
dc.identifier.urihttp://hdl.handle.net/10919/103546en
dc.identifier.volume14en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleEffect of polyoxymethylene (POM-H Delrin) off-gassing within the Pandora head sensor on direct-sun and multi-axis formaldehyde column measurements in 2016-2019en
dc.title.serialAtmospheric Measurement Techniquesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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