@article{
 title = {Nighttime isoprene chemistry at an urban-impacted forest site},
 type = {article},
 year = {1998},
 keywords = {1995 Southern Oxidants Study,Advective transport,Air pollution,Atmospheric boundary layer,Atmospheric chemistry,Chemical box model,Forested regions,High-NO/sub x/ transport events,Inversion,Methacrolein,Methyl vinyl ketone,Mixing ratios,NO/sub 3/,Nashville,Nighttime isoprene chemistry,O/sub 3/,Organic compounds,Oxidation products,Shallow nocturnal boundary layer,Sunset,Tennessee,United States,Urban-impacted forest site,ad 1995 07},
 pages = {22437-22447},
 volume = {103},
 id = {c42607f0-bda1-3c6e-ae6f-85d890b55774},
 created = {2015-02-12T14:35:32.000Z},
 file_attached = {false},
 profile_id = {81af7548-db00-3f00-bfa0-1774347c59e1},
 group_id = {63e349d6-2c70-3938-9e67-2f6483f6cbab},
 last_modified = {2015-02-12T20:20:04.000Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 source_type = {Journal Article},
 notes = {<m:note>Article<m:linebreak/>American Geophys. Union</m:note>},
 abstract = {Isoprene and its oxidation products methyl vinyl ketone (MVK) and methacrolein (MACR) were measured over a 4 week period in July of 1995 at a rural/forest site near Nashville, Tennessee, as part of the 1995 Southern Oxidants Study (SOS) field intensive. High nighttime isoprene mixing ratios, measured during a 3 day period of stagnant high pressure, are reported. These high nighttime isoprene events are interpreted as as result of continuing emission of isoprene into a developing shallow nocturnal boundary layer in the early evening, followed by advective transport under the inversion to the measurement site. During some evenings, there is very rapid decay of isoprene just after sunset. These events occurred when the product [O/sub 3/].[NO/sub 2/] was relatively large, consistent with loss via reaction with NO/sub 3/. A chemical box model showed that isoprene decays were consistent with the NO/sub 3/ mechanism but only for relatively high NO/sub x/ conditions. This study indicates that nighttime processing of isoprene can be important for forested regions susceptible to high-NO/sub x/ transport events. We also find that this nighttime NO/sub 3/ chemistry can lead to conditions where, at least at the surface, a significant fraction of the NO/sub y/ is in the form of organic nitrates that are products of the NO/sub 3/-isoprene reaction and that the NO/sub 3/-isoprene reaction can be the dominant NO/sub 3/ sink.},
 bibtype = {article},
 author = {Starn, T K and Shepson, P B and Bertman, S B and Riemer, D D and Zika, R G and Olszyn, K},
 journal = {Journal of Geophysical Research},
 number = {D17}
}

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Union</m:note>","abstract":"Isoprene and its oxidation products methyl vinyl ketone (MVK) and methacrolein (MACR) were measured over a 4 week period in July of 1995 at a rural/forest site near Nashville, Tennessee, as part of the 1995 Southern Oxidants Study (SOS) field intensive. High nighttime isoprene mixing ratios, measured during a 3 day period of stagnant high pressure, are reported. These high nighttime isoprene events are interpreted as as result of continuing emission of isoprene into a developing shallow nocturnal boundary layer in the early evening, followed by advective transport under the inversion to the measurement site. During some evenings, there is very rapid decay of isoprene just after sunset. These events occurred when the product [O/sub 3/].[NO/sub 2/] was relatively large, consistent with loss via reaction with NO/sub 3/. A chemical box model showed that isoprene decays were consistent with the NO/sub 3/ mechanism but only for relatively high NO/sub x/ conditions. This study indicates that nighttime processing of isoprene can be important for forested regions susceptible to high-NO/sub x/ transport events. We also find that this nighttime NO/sub 3/ chemistry can lead to conditions where, at least at the surface, a significant fraction of the NO/sub y/ is in the form of organic nitrates that are products of the NO/sub 3/-isoprene reaction and that the NO/sub 3/-isoprene reaction can be the dominant NO/sub 3/ sink.","bibtype":"article","author":"Starn, T K and Shepson, P B and Bertman, S B and Riemer, D D and Zika, R G and Olszyn, K","journal":"Journal of Geophysical Research","number":"D17","bibtex":"@article{\n title = {Nighttime isoprene chemistry at an urban-impacted forest site},\n type = {article},\n year = {1998},\n keywords = {1995 Southern Oxidants Study,Advective transport,Air pollution,Atmospheric boundary layer,Atmospheric chemistry,Chemical box model,Forested regions,High-NO/sub x/ transport events,Inversion,Methacrolein,Methyl vinyl ketone,Mixing ratios,NO/sub 3/,Nashville,Nighttime isoprene chemistry,O/sub 3/,Organic compounds,Oxidation products,Shallow nocturnal boundary layer,Sunset,Tennessee,United States,Urban-impacted forest site,ad 1995 07},\n pages = {22437-22447},\n volume = {103},\n id = {c42607f0-bda1-3c6e-ae6f-85d890b55774},\n created = {2015-02-12T14:35:32.000Z},\n file_attached = {false},\n profile_id = {81af7548-db00-3f00-bfa0-1774347c59e1},\n group_id = {63e349d6-2c70-3938-9e67-2f6483f6cbab},\n last_modified = {2015-02-12T20:20:04.000Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n source_type = {Journal Article},\n notes = {<m:note>Article<m:linebreak/>American Geophys. Union</m:note>},\n abstract = {Isoprene and its oxidation products methyl vinyl ketone (MVK) and methacrolein (MACR) were measured over a 4 week period in July of 1995 at a rural/forest site near Nashville, Tennessee, as part of the 1995 Southern Oxidants Study (SOS) field intensive. High nighttime isoprene mixing ratios, measured during a 3 day period of stagnant high pressure, are reported. These high nighttime isoprene events are interpreted as as result of continuing emission of isoprene into a developing shallow nocturnal boundary layer in the early evening, followed by advective transport under the inversion to the measurement site. During some evenings, there is very rapid decay of isoprene just after sunset. These events occurred when the product [O/sub 3/].[NO/sub 2/] was relatively large, consistent with loss via reaction with NO/sub 3/. A chemical box model showed that isoprene decays were consistent with the NO/sub 3/ mechanism but only for relatively high NO/sub x/ conditions. This study indicates that nighttime processing of isoprene can be important for forested regions susceptible to high-NO/sub x/ transport events. 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