Details

Autor(en) / Beteiligte

• Ren, Xinrong
• Harder, Hartwig
• Martinez, Monica
• Lesher, Robert L
• Oliger, Angelique
• Simpas, James B
• Brune, William H

Titel

OH and HO sub(2) Chemistry in the Urban Atmosphere of New York City

Ist Teil von

• Atmospheric environment (1994), 2003-08, Vol.37 (26), p.3639-3639

Erscheinungsjahr

2003

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• During the summer of 2001, simultaneous measurements were made of meteorological variables and atmospheric chemicals in New York City. Hydroxy and hydroperoxy radicals were measured as part of the campaign, providing a data set for validating a model of OH and HO sub(2) chemistry. The model was the Regional Atmospheric Chemistry Mechanism, which is outlined. The measurements and model exhibited similar diurnal and day-to-day variations in OH concentrations, with maxima in the early afternoon and minima at night. Similar agreement was found for the measured and modeled HO sub(2) variability, especially during midday, but the model tended to underestimate the morning measurements when nitric oxide concentrations were unusually high. Agreement between the measured and modeled HO sub(2)-to-OH ratios was good when NO was around a few ppbv. Calculation of the HO sub(x) budget showed that nitrous acid dominated HO sub(x) production during the day, while the ozone reaction with alkenes dominated at night.