OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison. Ren, X., R.; Brune, W., H.; Oliger, A.; Metcalf, A., R.; Simpas, J., B.; Shirley, T.; Schwab, J., J.; Bai, C., H.; Roychowdhury, U.; Li, Y., Q.; Cai, C., X.; Demerjian, K., L.; He, Y.; Zhou, X., L.; Gao, H., L.; and Hou, J. Journal of Geophysical Research-Atmospheres, 2006.
OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison [pdf]Paper  OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison [link]Website  abstract   bibtex   
[ 1] Hydroxyl ( OH), hydroperoxy (HO(2)) radicals, collectively known as HO(x), and OH reactivity, were measured during the PMTACS - NY (PM2.5 Technology Assessment and Characteristics Study-New York) summer 2002 intensive at Whiteface Mountain, Wilmington, New York. The measurement results of OH and HO(2) for 4 weeks are presented. Diurnal cycles show that the average noontime maximum mixing ratios were about 0.11 pptv (2.6 x 10(6) cm(-3)) for OH and 20 pptv for HO(2). Measured HO(2) to OH ratios were typically between 40 and 400, which are greater than those obtained in polluted and semipolluted rural environments. Low but significant mixing ratios of OH and HO(2) persisted into early evening and were frequently observed during nighttime, consistent with previous studies in different environments. Steady state OH and HO(2) were calculated with a zero-dimensional chemical model using a complete Regional Atmospheric Chemical Mechanism ( RACM) and a parameterized RACM which was constrained to the measured OH reactivity. Good agreement was obtained between the complete RACM and the parameterized RACM models. On average, the complete RACM model reproduced the observed OH with a median measured-to-modeled OH ratio of 0.82 and daytime HO(2) with a median measured-to-modeled HO(2) ratio of 1.21. The reasonably good agreement in this study is inconsistent with the significant underestimation of OH in the Program for Research on Oxidants: Photochemistry, Emissions, and Transport in 1998 (PROPHET98) study at a similar forested site. HO(x) budget analysis indicates that OH was primarily from the photolysis of HONO and O(3) during the day and from O(3) + alkenes reactions at night. The main HO(x) loss was the self reaction of HO(2). The good agreement between the measured and calculated OH reactivity in this environment contrasts with findings in the PROPHET2000 study, in which significant OH reactivity was missing and the missing OH reactivity was temperature-dependent.
@article{
 title = {OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison},
 type = {article},
 year = {2006},
 identifiers = {[object Object]},
 keywords = {aerosol formation,atmospheric chemistry,deciduous forest,hydroxyl radicals,new-york-city,north-western greece,peroxy-radicals,photochemistry experiment,summer 1999,tropospheric oh},
 volume = {111},
 websites = {<Go to ISI>://000237999700001},
 id = {0fcacd57-e14c-3f45-a455-813471698c7a},
 created = {2015-05-07T15:23:44.000Z},
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 last_modified = {2015-05-11T20:51:17.000Z},
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 language = {English},
 notes = {<b>From Duplicate 2 (<i>OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison</i> - Ren, X R; Brune, W H; Oliger, A; Metcalf, A R; Simpas, J B; Shirley, T; Schwab, J J; Bai, C H; Roychowdhury, U; Li, Y Q; Cai, C X; Demerjian, K L; He, Y; Zhou, X L; Gao, H L; Hou, J)<br/></b><br/><b>From Duplicate 1 (<i>OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison</i> - Ren, X R; Brune, W H; Oliger, A; Metcalf, A R; Simpas, J B; Shirley, T; Schwab, J J; Bai, C H; Roychowdhury, U; Li, Y Q; Cai, C X; Demerjian, K L; He, Y; Zhou, X L; Gao, H L; Hou, J)<br/></b><br/><b>From Duplicate 1 (<i>OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison</i> - Ren, X R; Brune, W H; Oliger, A; Metcalf, A R; Simpas, J B; Shirley, T; Schwab, J J; Bai, C H; Roychowdhury, U; Li, Y Q; Cai, C X; Demerjian, K L; He, Y; Zhou, X L; Gao, H L; Hou, J)<br/>And Duplicate 3 (<i>OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison</i> - Ren, X R; Brune, W H; Oliger, A; Metcalf, A R; Simpas, J B; Shirley, T; Schwab, J J; Bai, C H; Roychowdhury, U; Li, Y Q; Cai, C X; Demerjian, K L; He, Y; Zhou, X L; Gao, H L; Hou, J)<br/></b><br/>049EW<br/>Times Cited:18<br/>Cited References Count:44<br/><br/><b>From Duplicate 2 (<i>OH, HO(2), and OH reactivity during the PMTACS-NY Whiteface Mountain 2002 campaign: Observations and model comparison</i> - Ren, X R; Brune, W H; Oliger, A; Metcalf, A R; Simpas, J B; Shirley, T; Schwab, J J; Bai, C H; Roychowdhury, U; Li, Y Q; Cai, C X; Demerjian, K L; He, Y; Zhou, X L; Gao, H L; Hou, J)<br/></b><br/>049EW<br/>Times Cited:18<br/>Cited References Count:44},
 abstract = {[ 1] Hydroxyl ( OH), hydroperoxy (HO(2)) radicals, collectively known as HO(x), and OH reactivity, were measured during the PMTACS - NY (PM2.5 Technology Assessment and Characteristics Study-New York) summer 2002 intensive at Whiteface Mountain, Wilmington, New York. The measurement results of OH and HO(2) for 4 weeks are presented. Diurnal cycles show that the average noontime maximum mixing ratios were about 0.11 pptv (2.6 x 10(6) cm(-3)) for OH and 20 pptv for HO(2). Measured HO(2) to OH ratios were typically between 40 and 400, which are greater than those obtained in polluted and semipolluted rural environments. Low but significant mixing ratios of OH and HO(2) persisted into early evening and were frequently observed during nighttime, consistent with previous studies in different environments. Steady state OH and HO(2) were calculated with a zero-dimensional chemical model using a complete Regional Atmospheric Chemical Mechanism ( RACM) and a parameterized RACM which was constrained to the measured OH reactivity. Good agreement was obtained between the complete RACM and the parameterized RACM models. On average, the complete RACM model reproduced the observed OH with a median measured-to-modeled OH ratio of 0.82 and daytime HO(2) with a median measured-to-modeled HO(2) ratio of 1.21. The reasonably good agreement in this study is inconsistent with the significant underestimation of OH in the Program for Research on Oxidants: Photochemistry, Emissions, and Transport in 1998 (PROPHET98) study at a similar forested site. HO(x) budget analysis indicates that OH was primarily from the photolysis of HONO and O(3) during the day and from O(3) + alkenes reactions at night. The main HO(x) loss was the self reaction of HO(2). The good agreement between the measured and calculated OH reactivity in this environment contrasts with findings in the PROPHET2000 study, in which significant OH reactivity was missing and the missing OH reactivity was temperature-dependent.},
 bibtype = {article},
 author = {Ren, X R and Brune, W H and Oliger, A and Metcalf, A R and Simpas, J B and Shirley, T and Schwab, J J and Bai, C H and Roychowdhury, U and Li, Y Q and Cai, C X and Demerjian, K L and He, Y and Zhou, X L and Gao, H L and Hou, J},
 journal = {Journal of Geophysical Research-Atmospheres},
 number = {D10}
}
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