Investigation of a potential HCHO measurement artifact from ISOPOOH
Recent laboratory experiments have shown that a first generation isoprene oxidation product, ISOPOOH, can decompose to methyl vinyl ketone (MVK) and methacrolein (MACR) on instrument surfaces, leading to overestimates of MVK and MACR concentrations. Formaldehyde (HCHO) was suggested as a decompositi...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-09-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/9/4561/2016/amt-9-4561-2016.pdf |
| _version_ | 1818267843080224768 |
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| author | J. M. St. Clair J. C. Rivera-Rios J. D. Crounse E. Praske M. J. Kim G. M. Wolfe F. N. Keutsch P. O. Wennberg T. F. Hanisco |
| author_facet | J. M. St. Clair J. C. Rivera-Rios J. D. Crounse E. Praske M. J. Kim G. M. Wolfe F. N. Keutsch P. O. Wennberg T. F. Hanisco |
| author_sort | J. M. St. Clair |
| collection | DOAJ |
| description | Recent laboratory experiments have shown that a first
generation isoprene oxidation product, ISOPOOH, can decompose to methyl
vinyl ketone (MVK) and methacrolein (MACR) on instrument surfaces, leading
to overestimates of MVK and MACR concentrations. Formaldehyde (HCHO) was
suggested as a decomposition co-product, raising concern that in situ HCHO
measurements may also be affected by an ISOPOOH interference. The HCHO
measurement artifact from ISOPOOH for the NASA In Situ Airborne Formaldehyde
instrument (ISAF) was investigated for the two major ISOPOOH isomers,
(1,2)-ISOPOOH and (4,3)-ISOPOOH, under dry and humid conditions. The dry
conversion of ISOPOOH to HCHO was 3 ± 2 % and 6 ± 4 % for
(1,2)-ISOPOOH and (4,3)-ISOPOOH, respectively. Under humid (relative humidity of 40–60 %)
conditions, conversion to HCHO was 6 ± 4 % for (1,2)-ISOPOOH and
10 ± 5 % for (4,3)-ISOPOOH. The measurement artifact caused by
conversion of ISOPOOH to HCHO in the ISAF instrument was estimated for data
obtained on the 6 September 2013 flight of the Studies of Emissions and
Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys
(SEAC<sup>4</sup>RS) campaign. Prompt ISOPOOH conversion to HCHO was the source
of < 4 % of the observed HCHO, including in the high-isoprene
boundary layer. Time-delayed conversion, where previous exposure to ISOPOOH
affects measured HCHO later in the flight, was conservatively estimated to be
< 10 % of observed HCHO, and is significant only when high ISOPOOH
sampling periods immediately precede periods of low HCHO. |
| first_indexed | 2024-12-12T20:29:02Z |
| format | Article |
| id | doaj.art-9a57c70a60004514a8051ce95e647aa0 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-12T20:29:02Z |
| publishDate | 2016-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-9a57c70a60004514a8051ce95e647aa02022-12-22T00:13:05ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482016-09-01994561456810.5194/amt-9-4561-2016Investigation of a potential HCHO measurement artifact from ISOPOOHJ. M. St. Clair0J. C. Rivera-Rios1J. D. Crounse2E. Praske3M. J. Kim4G. M. Wolfe5F. N. Keutsch6P. O. Wennberg7T. F. Hanisco8Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAPaulson School of Engineering and Applied Sciences and Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USADivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USADivision of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USADivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USAAtmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USADepartment of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USADivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USAAtmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USARecent laboratory experiments have shown that a first generation isoprene oxidation product, ISOPOOH, can decompose to methyl vinyl ketone (MVK) and methacrolein (MACR) on instrument surfaces, leading to overestimates of MVK and MACR concentrations. Formaldehyde (HCHO) was suggested as a decomposition co-product, raising concern that in situ HCHO measurements may also be affected by an ISOPOOH interference. The HCHO measurement artifact from ISOPOOH for the NASA In Situ Airborne Formaldehyde instrument (ISAF) was investigated for the two major ISOPOOH isomers, (1,2)-ISOPOOH and (4,3)-ISOPOOH, under dry and humid conditions. The dry conversion of ISOPOOH to HCHO was 3 ± 2 % and 6 ± 4 % for (1,2)-ISOPOOH and (4,3)-ISOPOOH, respectively. Under humid (relative humidity of 40–60 %) conditions, conversion to HCHO was 6 ± 4 % for (1,2)-ISOPOOH and 10 ± 5 % for (4,3)-ISOPOOH. The measurement artifact caused by conversion of ISOPOOH to HCHO in the ISAF instrument was estimated for data obtained on the 6 September 2013 flight of the Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC<sup>4</sup>RS) campaign. Prompt ISOPOOH conversion to HCHO was the source of < 4 % of the observed HCHO, including in the high-isoprene boundary layer. Time-delayed conversion, where previous exposure to ISOPOOH affects measured HCHO later in the flight, was conservatively estimated to be < 10 % of observed HCHO, and is significant only when high ISOPOOH sampling periods immediately precede periods of low HCHO.http://www.atmos-meas-tech.net/9/4561/2016/amt-9-4561-2016.pdf |
| spellingShingle | J. M. St. Clair J. C. Rivera-Rios J. D. Crounse E. Praske M. J. Kim G. M. Wolfe F. N. Keutsch P. O. Wennberg T. F. Hanisco Investigation of a potential HCHO measurement artifact from ISOPOOH Atmospheric Measurement Techniques |
| title | Investigation of a potential HCHO measurement artifact from ISOPOOH |
| title_full | Investigation of a potential HCHO measurement artifact from ISOPOOH |
| title_fullStr | Investigation of a potential HCHO measurement artifact from ISOPOOH |
| title_full_unstemmed | Investigation of a potential HCHO measurement artifact from ISOPOOH |
| title_short | Investigation of a potential HCHO measurement artifact from ISOPOOH |
| title_sort | investigation of a potential hcho measurement artifact from isopooh |
| url | http://www.atmos-meas-tech.net/9/4561/2016/amt-9-4561-2016.pdf |
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