@article{
 title = {The behavior of some organic nitrates at Boulder and Niwot Ridge, Colorado},
 type = {article},
 year = {1990},
 keywords = {2-butyl nitrate,2bn,Atmosphere,Atmospheric chemistry,Atmospheric composition,Boulder,Chemical composition,Colorado,Diurnal variation,N-propyl nitrate,Niwot Ridge,Organic compounds,Organic nitrates,Peroxyacetyl nitrate,Peroxypropionyl nitrate,United States,pan,ppn,usa},
 pages = {13949-13961},
 volume = {95},
 id = {29eb95c0-d919-3e40-b0d8-65369a37d2cb},
 created = {2015-02-12T14:35:37.000Z},
 file_attached = {false},
 profile_id = {81af7548-db00-3f00-bfa0-1774347c59e1},
 group_id = {63e349d6-2c70-3938-9e67-2f6483f6cbab},
 last_modified = {2015-02-12T20:21:34.000Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 source_type = {Journal Article},
 notes = {<m:note>Article</m:note>},
 abstract = {Observations show that the ratio of peroxypropionyl nitrate (PPN) to peroxyacetyl nitrate (PAN) increases to a maximum in the afternoon period at Boulder and at Niwot Ridge. In Boulder air and in easterly flow reaching Niwot Ridge, maximum average PPN/PAN ratios were near 15%, while in westerly flow or more remote continental air, the ratio was much smaller and averaged 4%. Relative to the PAN-mixing ratios, methyl nitrate (MN) was less than 0.2% in the afternoon and less than 0.9% at night in Boulder air masses. The sum of ambient n-propyl nitrate (NPN) and 2-butyl nitrate (2BN) mixing ratios was also small, the diurnal average at Niwot Ridge being about 2% of the PAN-mixing ratio.},
 bibtype = {article},
 author = {Ridley, B A and Shetter, J D and Walega, J G and Madronich, S and Elsworth, C M and Grahek, F E and Fehsenfeld, F C and Norton, R B and Parrish, D D and Hubler, G and Buhr, M and Williams, E J and Allwine, E J and Westberg, H H},
 journal = {Journal of Geophysical Research},
 number = {D9}
}

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In Boulder air and in easterly flow reaching Niwot Ridge, maximum average PPN/PAN ratios were near 15%, while in westerly flow or more remote continental air, the ratio was much smaller and averaged 4%. Relative to the PAN-mixing ratios, methyl nitrate (MN) was less than 0.2% in the afternoon and less than 0.9% at night in Boulder air masses. 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