the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Ethylene Oxide Monitor with Part-per-Trillion Precision for In-Situ Measurements
Tara I. Yacovitch
Christoph Dyroff
Joseph R. Roscioli
Conner Daube
J. Barry McManus
Scott C. Herndon
Abstract. An Aerodyne Tunable Infrared Direct Absorption Spectrometer with 413 meter cell for the detection of ethylene oxide (EtO) is presented (TILDAS-FD-EtO). This monitor achieves precisions of <75 ppt or <0.075 ppb in 1 second and < 20 ppt in 100 seconds (1-sigma). We demonstrate precisions averaging down to 4 ppt in an hour (1-sigma precision) when operated with frequent humidity-matched zeroes. A months-long record of 2022 ambient concentrations at a site in the Eastern United States is presented. Average ambient EtO concentration is on the order of 18 ppt (22 ppt standard deviation). Enhancement events of EtO lasting a few hours are observed, with peaks as high as 600 ppt. Back trajectory simulations suggest an EtO source nearly 35 km away. This source along with another are confirmed as emitters through mobile near-source measurements, with downwind concentrations in the 0.5 ppb to 700 ppb range depending on source identity and distance downwind.
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Tara I. Yacovitch et al.
Status: closed
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RC1: 'Comment on amt-2022-294', Alan Fried, 24 Nov 2022
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-RC1-supplement.pdf
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CC1: 'Author Reply to RC1', Tara Yacovitch, 13 Dec 2022
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-CC1-supplement.pdf
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AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-AC1-supplement.pdf
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AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
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AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-AC1-supplement.pdf
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CC1: 'Author Reply to RC1', Tara Yacovitch, 13 Dec 2022
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RC2: 'Comment on amt-2022-294', Anonymous Referee #2, 18 Jan 2023
Review of Yakovitch et al., AMTD
This is a nice concise paper that describes the TILDAS-FD-EtO analyzer for ethylene oxide.
This is a really difficult measurement (due to low conc and potential interferences) and the authors give a good description here.
The large enhancements from two Facilities observed at the lab are very interesting and chasing down those sources with the mobile lab is particularly impressive.ÂI only have a couple of minor comments below.Â
Line 7. I don't think the cell is 413m long. I think you mean a cell with a 413 m path length.Â
line 55. Whats the cell pressure? Add it here.Â
line 103. "averages down well" is something I would say but it is a bit informal. Maybe reword.Â
Line 129. Hysplit is a model not an engine.
Line 152. I'm not sure this the best way to represent these statistics. Is the 18 ppt a general background for the hourly average in Fig 3?Â
Is the 22 ppt sd real signal or noise? Maybe include the averaging time? Maybe clarify what you explicitly mean here. Â
I think Fig S1 is especially helpful to the discussion. Would you consider moving it (or something similar) to the main text?ÂCitation: https://doi.org/10.5194/amt-2022-294-RC2 -
AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-AC1-supplement.pdf
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AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
Status: closed
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RC1: 'Comment on amt-2022-294', Alan Fried, 24 Nov 2022
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-RC1-supplement.pdf
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CC1: 'Author Reply to RC1', Tara Yacovitch, 13 Dec 2022
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-CC1-supplement.pdf
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AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-AC1-supplement.pdf
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AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
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AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-AC1-supplement.pdf
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CC1: 'Author Reply to RC1', Tara Yacovitch, 13 Dec 2022
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RC2: 'Comment on amt-2022-294', Anonymous Referee #2, 18 Jan 2023
Review of Yakovitch et al., AMTD
This is a nice concise paper that describes the TILDAS-FD-EtO analyzer for ethylene oxide.
This is a really difficult measurement (due to low conc and potential interferences) and the authors give a good description here.
The large enhancements from two Facilities observed at the lab are very interesting and chasing down those sources with the mobile lab is particularly impressive.ÂI only have a couple of minor comments below.Â
Line 7. I don't think the cell is 413m long. I think you mean a cell with a 413 m path length.Â
line 55. Whats the cell pressure? Add it here.Â
line 103. "averages down well" is something I would say but it is a bit informal. Maybe reword.Â
Line 129. Hysplit is a model not an engine.
Line 152. I'm not sure this the best way to represent these statistics. Is the 18 ppt a general background for the hourly average in Fig 3?Â
Is the 22 ppt sd real signal or noise? Maybe include the averaging time? Maybe clarify what you explicitly mean here. Â
I think Fig S1 is especially helpful to the discussion. Would you consider moving it (or something similar) to the main text?ÂCitation: https://doi.org/10.5194/amt-2022-294-RC2 -
AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-294/amt-2022-294-AC1-supplement.pdf
-
AC1: 'Author Reply to RC2', Christoph Dyroff, 12 Feb 2023
Tara I. Yacovitch et al.
Data sets
Dataset for "Ethylene Oxide Monitor with Part-per-Trillion Precision for In-Situ Measurements" Tara I. Yacovitch, Christoph Dyroff, Joseph R. Roscioli, Conner Daube, J. Barry McManus, Scott C. Herndon https://osf.io/jeywd/?view_only=421c0d48e2d1449488c14f883a7859b6
Tara I. Yacovitch et al.
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