Modelled and measured concentrations of peroxy radicals and nitrate radical in the U.S. Gulf Coast region during TexAQS 2006     

Roberto Sommariva  Tim S. Bates  Daniel Bon  Daniel M. Brookes  Joost A. de Gouw  Jessica B. Gilman  Scott C. Herndon  William C. Kuster  Brian M. Lerner  Paul S. Monks  Hans D. Osthoff  Alex E. Parker  James M. Roberts  Sara C. Tucker  Carsten Warneke  Eric J. Williams  Mark S. Zahniser  Steven S. Brown 《Journal of Atmospheric Chemistry》2011,68(4):331-362

Measurements of total peroxy radicals (HO₂?+?RO₂) and nitrate radical (NO₃) were made on the NOAA research vessel R/V?Brown along the U.S. Gulf Coast during the TexAQS 2006 field campaign. The measurements were modelled using a constrained box-model based upon the Master Chemical Mechanism (MCM). The agreement between modelled and measured HO₂?+?RO₂ was typically within ??40% and, in the unpolluted regions, within 30%. The analysis of the model results suggests that the MCM might underestimate the concentrations of some acyl peroxy radicals and other small peroxy radicals. The model underestimated the measurements of NO₃ by 60?C70%, possibly because of rapid heterogeneous uptake of N₂O₅. The MCM model results were used to estimate the composition of the peroxy radical pool and to quantify the role of DMS, isoprene and alkenes in the formation of RO₂ in the different regions. The measurements of HO₂?+?RO₂ and NO₃ were also used to calculate the gas-phase budget of NO₃ and quantify the importance of organic peroxy radicals as NO₃ sinks. RO₂ accounted, on average, for 12?C28% of the total gas-phase NO₃ losses in the unpolluted regions and for 1?C2% of the total gas-phase NO₃ losses in the polluted regions.  相似文献   

Characterizing Atmospheric Aerosols off the Atlantic Canadian Coast During C-FOG     

Chisholm  Nicole  Nagare  Baban  Wainwright  Charlotte  Creegan  Ed  Salehpoor  Leyla  VandenBoer  Trevor C.  Bullock  Terry  Croft  Betty  Lesins  Glen  Osthoff  Hans  Fernando  H. J. S.  Chang  Rachel Y.-W. 《Boundary-Layer Meteorology》2021,181(2-3):345-364

Boundary-Layer Meteorology - Marine aerosols play an important role in the Earth’s climate, but their effects remain highly uncertain due to a poor understanding of their sources, properties,...  相似文献