World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Wrf-chem Model Predictions of the Regional Impacts of N2O5 Heterogeneous Processes on Night-time Chemistry Over North-western Europe : Volume 15, Issue 3 (09/02/2015)

By Lowe, D.

Click here to view

Book Id: WPLBN0003986323
Format Type: PDF Article :
File Size: Pages 25
Reproduction Date: 2015

Title: Wrf-chem Model Predictions of the Regional Impacts of N2O5 Heterogeneous Processes on Night-time Chemistry Over North-western Europe : Volume 15, Issue 3 (09/02/2015)  
Author: Lowe, D.
Volume: Vol. 15, Issue 3
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Utembe, S., Jones, R., Lowe, D., Archer-Nicholls, S., Mcfiggans, G., Morgan, W.,...Carlo, P. D. (2015). Wrf-chem Model Predictions of the Regional Impacts of N2O5 Heterogeneous Processes on Night-time Chemistry Over North-western Europe : Volume 15, Issue 3 (09/02/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: School of Earth, Atmospheric & Environmental Sciences, University of Manchester, Manchester, UK. Chemical modelling studies have been conducted over north-western Europe in summer conditions, showing that night-time dinitrogen pentoxide (N2O5) heterogeneous reactive uptake is important regionally in modulating particulate nitrate and has a~modest influence on oxidative chemistry. Results from Weather Research and Forecasting model with Chemistry (WRF-Chem) model simulations, run with a detailed volatile organic compound (VOC) gas-phase chemistry scheme and the Model for Simulating Aerosol Interactions and Chemistry (MOSAIC) sectional aerosol scheme, were compared with a series of airborne gas and particulate measurements made over the UK in July 2010. Modelled mixing ratios of key gas-phase species were reasonably accurate (correlations with measurements of 0.7–0.9 for NO2 and O3). However modelled loadings of particulate species were less accurate (correlation with measurements for particulate sulfate and ammonium were between 0.0 and 0.6). Sulfate mass loadings were particularly low (modelled means of 0.5–0.7 Μg kg−1air, compared with measurements of 1.0–1.5 Μg kg−1air). Two flights from the campaign were used as test cases – one with low relative humidity (RH) (60–70%), the other with high RH (80–90%). N2O5 heterogeneous chemistry was found to not be important in the low-RH test case; but in the high-RH test case it had a strong effect and significantly improved the agreement between modelled and measured NO3 and N2O5. When the model failed to capture atmospheric RH correctly, the modelled NO3 and N2O5 mixing ratios for these flights differed significantly from the measurements. This demonstrates that, for regional modelling which involves heterogeneous processes, it is essential to capture the ambient temperature and water vapour profiles.

The night-time NO3 oxidation of VOCs across the whole region was found to be 100–300 times slower than the daytime OH oxidation of these compounds. The difference in contribution was less for alkenes (× 80) and comparable for dimethylsulfide (DMS). However the suppression of NO3 mixing ratios across the domain by N2O5 heterogeneous chemistry has only a very slight, negative, influence on this oxidative capacity. The influence on regional particulate nitrate mass loadings is stronger. Night-time N2O5 heterogeneous chemistry maintains the production of particulate nitrate within polluted regions: when this process is taken into consideration, the daytime peak (for the 95th percentile) of PM10 nitrate mass loadings remains around 5.6 Μg kg−1air, but the night-time minimum increases from 3.5 to 4.6 Μg kg−1air. The sustaining of higher particulate mass loadings through the night by this process improves model skill at matching measured aerosol nitrate diurnal cycles and will negatively impact on regional air quality, requiring this process to be include


Summary
WRF-Chem model predictions of the regional impacts of N2O5 heterogeneous processes on night-time chemistry over north-western Europe

Excerpt
Abdul-Razzak, H. and S. J. Ghan: A parameterisation of aerosol activation: 3. Sectional representation, J. Geophys. Res., 107, 4026, doi:10.1029/2001JD000483, 2002.; Allan, B. J., McFiggans, G., Plane, J. M. C., Coe, H., and McFadyen, G. G.: The nitrate radical in the remote marine boundary layer, J. Geophys. Res., 105, 24191–24204, doi:10.1029/2000JD900314, 2000.; Anttila, T., Kiendler-Scharr, A., Tillmann, R., and Mentel, T. F.: On the reactive uptake of gaseous compounds by organic-coated aqueous aerosols: theoretical analysis and application to the heterogeneous hydrolysis of N2O5, J. Phys. Chem. A, 110, 10435–10443, 2006.; Archer-Nicholls, S., Lowe, D., Utembe, S., Allan, J., Zaveri, R. A., Fast, J. D., Hodnebrog, Ø., Denier van der Gon, H., and McFiggans, G.: Gaseous chemistry and aerosol mechanism developments for version 3.5.1 of the online regional model, WRF-Chem, Geosci. Model Dev., 7, 2557–2579, doi:10.5194/gmd-7-2557-2014, 2014.; Asaf, D., Tas, E., Pedersen, D., Peleg, M., and Luria, M.: Long-term measurements of NO3 radical at a semiarid urban site: 2. Seasonal trends and loss mechanisms, Environ. Sci. Technol., 44, 5001–5007, doi:10.1021/es100967z, 2010.; Atkinson, R.: Atmospheric chemistry of VOCs and NOx, Atmos. Environ., 34, 2063–2101, doi:10.1016/S1352-2310(99)00460-4, 2000.; Atkinson, R. and Arey, J.: Atmospheric degradation of volatile organic compounds, Chem. Rev., 103, 4605–4638, doi:10.1021/cr0206420, 2003.; Atkinson, R., Baulch, D. L., Cox, R. A., Crowley, J. N., Hampson, R. F., Hynes, R. G., Jenkin, M. E., Rossi, M. J., and Troe, J.: Evaluated kinetic and photochemical data for atmospheric chemistry: Volume I – gas phase reactions of Ox, HOx, NOx and SOx species, Atmos. Chem. Phys., 4, 1461–1738, doi:10.5194/acp-4-1461-2004, 2004.; Bahreini, R., Ervens, B., Middlebrook, A. M., Warneke, C., de Gouw, J. A., DeCarlo, P. F., Jimenez, J. L., Brock, C. A., Neuman, J. A., Ryerson, T. B., Stark, H., Atlas, E., Brioude, J., Fried, A., Holloway, J. S., Peischl, J., Richter, D., Walega, J., Weibring, P., Wollny, A. G., and Fehsenfeld, F. C.: Organic aerosol formation in urban and industrial plumes near Houston and Dallas, Texas, J. Geophys. Res., 114, D00F16, doi:10.1029/2008JD011493, 2009.; Bertram, T. H. and Thornton, J. A.: Toward a general parameterization of N2O5 reactivity on aqueous particles: the competing effects of particle liquid water, nitrate and chloride, Atmos. Chem. Phys., 9, 8351–8363, doi:10.5194/acp-9-8351-2009, 2009.; Brown, S. S. and Stutz, J.: nighttime radical observations and chemistry, Chem. Soc. Rev., 41, 6405–6447, doi:10.1039/c2cs35181a, 2012.; Brown, S. S., Ryerson, T. B., Wollny, A. G., Brock, C. A., Peltier, R., Sullivan, A. P., Weber, R. J., Dubé, W. P., Trainer, M., Meagher, J. F., Fehsenfeld, F. C., and Ravishankara, A. R.: Variability in nocturnal nitrogen oxide processing and its role in regional air quality, Science, 311, 67–70, doi:10.1126/science.1120120, 2006.; Brown, S. S., Dubé, W. P., Fuchs, H., Ryerson, T. B., Wollny, A. G., Brock, C. A., Bahreini, R., Middlebrook, A. M., Neuman, J. A., Atlas, E., Roberts, J. M., O

 

Click To View

Additional Books


  • Tropospheric No2 Columns: a Comparison B... (by )
  • High Molecular Weight Soa Formation Duri... (by )
  • Physical Properties and Concentration of... (by )
  • Implementing Growth and Sedimentation of... (by )
  • Ultrathin Tropical Tropopause Clouds (Ut... (by )
  • Interpreting the Variability of Space-bo... (by )
  • Inferring Regional Sources and Sinks of ... (by )
  • Synergetic Monitoring of Saharan Dust Pl... (by )
  • A Study of Polar Ozone Depletion Based o... (by )
  • Comparisons of Urban and Rural Pm10−2.5 ... (by )
  • Aerosol Formation Over the Boreal Forest... (by )
  • Repeatability and Randomness in Heteroge... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.