Estimation and comparison of night-time OH levels in the UK urban atmosphere using two different analysis methods

作     者：M.Anwar H.Khan M.M.Nazmul Hoque S.Shamsul Alam M.J.Ashfold Graham Nickless Dudley E.Shallcross 

作者机构：School of ChemistryUniversity of BristolBS8 1TSUnited Kingdom Department of GeographyUniversity of California Berkeley540 McCone HallBerkeleyCA 94720USA Department of ChemistryShahjalal University of Science and TechnologySylhet-3114Bangladesh 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2011年第23卷第1期

页      面：60-64页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

基　　金：a Dorothy Hodgkin Fellowship and M.M.Nazmul Hoque thank SUST for supporting the work.Dudley E.Shallcross thanks NERC under whose auspices elements of this work was carried out 

主　　题：night-time urban National Environmental Technology Center steady state approximation hydrocarbon decay method 

摘      要：Night-time OH levels have been determined for UK urban surface environments using two methods, the decay and steady state approximation methods. Measurement data from the UK National Environmental Technology Centre archive for four urban sites （Bristol, Harwell, London Eltham and Edinburgh） over the time period of 1996 to 2000 have been used in this study. Three reactive alkenes, namely isoprene, 1,3-butadiene and trans-2-pentene were chosen for the calculation of OH levels by the decay method. Hourly measurements of NO, NO〉 03, CO and 20 VOCs were used to determine night-time OH level using the steady state approximation method. Our results showed that the night-time OH levels were in the range of 1 × 10^3-1× 10^6 molecules/cm3 at these four urbap sites in the UK. The application of a t-test of these analyses indicated that except Bristol, there was no significant difference between the OH levels found from the decay and steady state approximation methods. Night-time levels of the OH radical appeared to peak in summer and spring time tracking the night-time 03 levels which also passed through a maximum at this time.