References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-13-851-2013

The influence of biomass burning on the global distribution of selected non-methane organic compounds

Lewis

A. C.

¹ Evans

M. J.

¹ ² Hopkins

J. R.

¹ Punjabi

² Read

K. A.

¹ Purvis

R. M.

¹ Andrews

S. J.

² Moller

S. J.

¹ Carpenter

L. J.

² Lee

J. D.

¹ Rickard

A. R.

¹ Palmer

P. I.

³ Parrington

National Centre for Atmospheric Science (NCAS), University of York, Heslington, York YO10 5DD, UK

Department of Chemistry, University of York, Heslington, York YO10 5DD, UK

School of Geosciences, University of Edinburgh, The King's Buildings, Edinburgh EH9 3JN, UK

22 01 2013

13 2 851 867

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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The full text article is available as a PDF file from http://www.atmos-chem-phys.net/13/851/2013/acp-13-851-2013.pdf

Forests fires are a significant source of chemicals to the atmosphere including numerous non-methane organic compounds (NMOCs). We report airborne measurement of hydrocarbons, acetone and methanol from >500 whole air samples collected over Eastern Canada, including interceptions of several different boreal biomass burning plumes. From these and concurrent measurements of carbon monoxide (CO) we derive fire emission ratios for 29 different organic species relative to the emission of CO. These range from 8.9 ± 3.2 ppt ppb−1 CO for methanol to 0.007 ± 0.004 ppt ppb−1 CO for cyclopentane. The ratios are in good to excellent agreement with literature values. Using the GEOS-Chem global 3-D chemical transport model (CTM) we show the influence of biomass burning on the global distributions of benzene, toluene, ethene and propene (species which are controlled for air quality purposes and sometimes used as indicative tracers of anthropogenic activity). Using our observationally derived emission ratios and the GEOS-Chem CTM, we show that biomass burning can be the largest fractional contributor to observed benzene, toluene, ethene and propene levels in many global locations. The widespread biomass burning contribution to atmospheric benzene, a heavily regulated air pollutant, suggests that pragmatic approaches are needed when setting air quality targets as tailpipe and solvent emissions decline in developed countries. We subsequently determine the extent to which the 28 global-status World Meteorological Organisation – Global Atmosphere Watch stations worldwide are influenced by biomass burning sourced benzene, toluene, ethene and propene as compared to their exposure to anthropogenic emissions.

References 1

Akagi, S. K., Yokelson, R. J., Wiedinmyer, C., Alvarado, M. J., Reid, J. S., Karl, T., Crounse, J. D., and Wennberg, P. O.: Emission factors for open and domestic biomass burning for use in atmospheric models, Atmos. Chem. Phys., 11, 4039–4072, http://dx.doi.org/10.5194/acp-11-4039-2011doi:10.5194/acp-11-4039-2011, 2011.

Amiro, B. D., Cantin, A., Flannigan, M. D., and de Groot, W. J.: Future emissions from Canadian boreal forest fires, Can. J. For. Res., 39, 383–395, 2009.

Andreae, M. O. and Merlet, P.: Emission of trace gases and aerosols from biomass burning, Global Biogeochem. Cy., 15, 955–966, http://dx.doi.org/10.1029/2000GB001382doi:10.1029/2000GB001382, 2001.

AQEG: Air quality and climate change: a UK perspective. Report of the UK Air Quality Expert Group, AQEG. Prepared for the Department for Environment Food and Rural Affairs, the Scottish Executive, the Welsh Assembly and the Department of the Environment in Northern Ireland, Defra publications, London, April 2007. ISBN 0-85521-172-5, 2007.

Atkinson, R.: Gas-phase tropospheric chemistry of organic compounds, J. Phys. Chem. Ref. Data, Monogr., 2, 216–234, 1994.

Badol, C., Locoge, N., and Galloo, J.-C.: Using a source-receptor approach to characterise VOC behaviour in a French urban area influenced by industrial emissions. Part II: Source contribution assessment using the Chemical Mass Balance (CMB) model, Sci. Total Environ., 389, 429–440, 2008.

Baker, A. K., Beyersdorf, A. J., Doezema, L. A., Katzenstein, A., Meinardi, S., Simpson, I. J., Blake, D. R., and Rowland, F. S.: Measurement of nonmethane hydrocarbons in 28 United States cities, Atmos. Environ., 42, 170–182, 2008.

Bertschi, I. T., Yokelson, R. J., Ward, D. E., Babbitt, R. E., Susott, R. A., Goode, J. G., and Hao, W. M.: Trace gas and particle emissions from fires in large diameter and belowground biomass fuels, J. Geophys. Res., 108, 8472, doi:10.1029/2002JD002100, 2003.

Bey, I., Jacob, D. J., Yantosca, R. M, Logan, J. A., Field, B. D., Flore, A. M., Li, Q. B., Liu, H. G. Y., Mickley, L. J., and Schultz, M. G.: Global modeling of tropospheric chemistry with assimilated meteorology: Model description and evaluation, J. Geophys. Res., 106, 23073–23095, 2001.

Christian, T. J., Kleiss, B., Yokelson, R. J., Holzinger, R., Crutzen, P. J., Hao, W. M., Saharjo, B. H., and Ward, D. E.: Comprehensive laboratory measurements of biomass-burning emissions: 1. Emissions from Indonesian, African, and other fuels, J. Geophys Res., 108, http://dx.doi.org/10.1029/2003JD003704doi:10.1029/2003JD003704, 2003.

Christian, T. J., Kleiss, B., Yokelson, R. J., Holzinger, R., Crutzen, P. J., Hao, W. M., Shirai, T., and Blake, D. R.: Comprehensive laboratory measurements of biomass-burning emissions: 2. First intercomparison of open-path FTIR, PTR-MS, and GC- MS/FID/ECD, J. Geophys Res., 109, D02311, http://dx.doi.org/10.1029/2003JD003874doi:10.1029/2003JD003874, 2004.

Crutzen P. J. and Andreae, M. O.: Biomass burning in the tropics – impact on atmospheric chemistry and biogeochemical cycles, Science, 4988, 1669–1678, 1990.

Crutzen, P. J., Heidt, L. E., Kransec, J. P., Pollock, W. H., and Seiler, W.: Biomass burning as a source of atmospheric gases CO, H2, N2O, NO, CH3Cl and COS, Nature, 282, 253–256, 1979.

de Gouw, J. A., Warneke, C., Stohl, A., Wollny, A. G., Brock, C. A., Cooper, O. R., Holloway, J. S., Trainer, M., Fehsenfeld, F. C., Atlas, E. L., Donnelly, S. G., Stroud, V., and Lueb, A.: Volatile organic compounds composition of merged and aged forest fire plumes from Alaska and western Canada, J. Geophys Res., 111, D10303, http://dx.doi.org/10.1029/2005JD006175doi:10.1029/2005JD006175, 2006.

Dollard, G. J, Dumitrean, P., Telling, S., Dixon, J., and Derwent, R. G.: Observed trends in ambient concentrations of C2-C8 hydrocarbons in the United Kingdom over the period from 1993 to 2004, Atmos. Environ., 41, 2559–2569, 2007.

Duarte-Davidson, R., Courage, C., Rushton, L., and Levy, L.: Benzene in the environment: an assessment of the potential risks to the health of the population, Occupational and Environmental Medicine, 58, 2–13, 2001.

Duck, T. J., Firanski, B. J., Millet, D. B., Goldstein, A. H., Allan, J., Holzinger, R., Worsnop, D. R., White, A. B., Stohl, A., Dickinson, C. S., and van Donkelaar, A.: Transport of forest fire emissions from Alaska and the Yukon Territory to Nova Scotia during summer 2004, J. Geophys. Res., 112, D10S44, http://dx.doi.org/10.1029/2006JD007716doi:10.1029/2006JD007716, 2007.

Fehsenfeld, F. C., Ancellet, G., Bates, T., Goldstein, A., Hardesty, M., Honrath, R., Law, K., Lewis, A. C., Leaitch, R., McKeen, S., Meagher, J., Parrish, D. D., Pszenny, A. A. P., Russell, P. B., Schlager, H., Seinfeld, J., Trainer, M., and Talbot, R.: International Consortium for Atmospheric Research on Transport and Transformation (ICARTT): North America To Europe: Overview Of The 2004 Summer Field Study, J. Geophys. Res., 111, D23S01, http://dx.doi.org/10.1029/2006JD007829doi:10.1029/2006JD007829, 2006.

Flannigan, M. D., Logan, K. A., Amiro, B. D., Skinner, W. R., and Stocks, B. J.: Future area burned in Canada, Clim. Change, 72, 1–16, 2005.

Fromm, M., Alfred, J., Hoppel, K., Hornstein, J., Bevilacqua, R., Shettle, E., Servranckx, R., Li , Z. Q., and Stocks, B.: Observations of boreal forest fire smoke in the stratosphere by POAM III, SAGE II, and lidar in 1998, J. Geophys Res., 27, 1407–1410, http://dx.doi.org/10.1029/1999GL011200doi:10.1029/1999GL011200, 2000.

Girardin, M. P.: Interannual to decadal changes in area burned in Canada from 1781 to 1982 and the relationship to Northern Hemisphere land temperatures, Global Ecol. Biogeogr., 16, 557–566, 2007.

Hallquist, M., Wenger, J. C., Baltensperger, U., Rudich, Y., Simpson, D., Claeys, M., Dommen, J., Donahue, N. M., George, C., Goldstein, A. H., Hamilton, J. F., Herrmann, H., Hoffmann, T., Iinuma, Y., Jang, M., Jenkin, M. E., Jimenez, J. L., Kiendler-Scharr, A., Maenhaut, W., McFiggans, G., Mentel, Th. F., Monod, A., Prévôt, A. S. H., Seinfeld, J. H., Surratt, J. D., Szmigielski, R., and Wildt, J.: The formation, properties and impact of secondary organic aerosol: current and emerging issues, Atmos. Chem. Phys., 9, 5155–5236, http://dx.doi.org/10.5194/acp-9-5155-2009doi:10.5194/acp-9-5155-2009, 2009.

Helmig, D., Bottenheim, J., Galbally, I. E., Lewis, A. C., Milton, M. J. T., Penkett, S. A., Plass-Duelmer, C., Reimann, S., Tans, P., and Thiel, S.: Volatile Organic Compounds In The Global Atmosphere, EOS Transactions, 90, 513–514, 2009.

Henze, D. K., Seinfeld, J. H., Ng, N. L., Kroll, J. H., Fu, T.-M., Jacob, D. J., and Heald, C. L.: Global modeling of secondary organic aerosol formation from aromatic hydrocarbons: high- vs. low-yield pathways, Atmos. Chem. Phys., 8, 2405–2420, http://dx.doi.org/10.5194/acp-8-2405-2008doi:10.5194/acp-8-2405-2008, 2008.

Holzinger, R., Williams, J., Salisbury, G., Klüpfel, T., de Reus, M., Traub, M., Crutzen, P. J., and Lelieveld, J.: Oxygenated compounds in aged biomass burning plumes over the Eastern Mediterranean: evidence for strong secondary production of methanol and acetone, Atmos. Chem. Phys., 5, 39–46, http://dx.doi.org/10.5194/acp-5-39-2005doi:10.5194/acp-5-39-2005, 2005.

Houweling, S., Dentener, F. and Lelieveld, J.: The impact of non-methane hydrocarbons on tropospheric photochemistry, J. Geophys. Res., 103, 10673–10696, 1998.

Hyde, J. C., Smith, A. M. S., Ottmar, R. D., Alvarado, E. C., and Morgan, P.: The combustion of sound and rotten coarse woody debris, Int. J. Wildfire, 20, 163–174, 2011.

Jaffe, D. A. and Wigder, N. L.: Ozone production from wildfires: A critical review, Atmos. Environ., 51, 1–10, doi:10.1016/j.atmosenv.2011.11.063, 2012.

Jost, C., Trentmann, J., Sprung, D., Andreae, M. O., McQuaid, J. B., and Barjat, H.: Trace gas chemistry in a young biomass burning plume over Namibia: Observations and model simulations, J. Geophys. Res., 108, 8482, http://dx.doi.org/10.1029/2002JD002431doi:10.1029/2002JD002431, 2003.

Jost, H. J., Drdla, K., Stohl, A., Pfister, L., Loewenstein, M., Lopez, J. P., Hudson, P. K., Murphy, D. M., Cziczo, D. J., Fromm, M., Bui, T. P., Dean-Day, J., Gerbig, C., Mahoney, M. J., Richard, E. C., Spichtinger, N., Pittman, J. V., Weinstock, E. M., Wilson, J. C., and Xueref, I.: In-situ observations of mid-latitude forest fire plumes deep in the stratosphere, Geophys. Res. Lett., 31, L11101, http://dx.doi.org/10.1029/2003GL019253doi:10.1029/2003GL019253, 2004.

Kasischke, E. S. and Stocks, B. J.: Fire, climate change and carbon cycling in the boreal forest. Springer-Verlag, New York, New York, USA, 2000.

Kasischke, E. S. and Turetsky, M. R.: Recent changes in the fire regime across the North American boreal region – Spatial and temporal patterns of burning across Canada and Alaska, Geophys. Res. Lett., 33, L09703, http://dx.doi.org/10.1029/2006GL025677doi:10.1029/2006GL025677, 2006.

Kasischke, E. S., Hyer, E. J., Novelli, P. C., Bruhwiler, L. P., French, N. H. F., Sukhinin, A. I., Hewson, J. H., and Stocks, B. J.: Influences of boreal fire emissions on Northern Hemisphere atmospheric carbon and carbon monoxide, Global Biogeochem. Cy., 19, GB1012, http://dx.doi.org/10.1029/2004GB002300doi:10.1029/2004GB002300, 2005.

Koppman, R.: Volatile Organic Compounds in the Atmosphere, Blackwell Publishing, Oxford, UK, 2007.

Krol, M., van Leeuwen, P. J., and Lelieveld, J.:~Global OH trend inferred from methylchloroform measurements,~J. Geophys. Res.,103, 10697–10711, http://dx.doi.org/10.1029/98JD00459doi:10.1029/98JD00459, 1998.

Lewis, A. C., Evans, M. J., Methven, J., Watson, N., Lee, J. D., Hopkins, J. R., Purvis, R. M., Arnold, S. R., McQuaid, J. B., Whalley, L. K., Pilling, M. J., Heard, D. E., Monks, P. S., Parker, A. E., Reeves, C. E., Oram, D. E., Mills, G., Bandy, B. J., Stewart, D., Coe, H., Williams, P., and Crosier, J.: Chemical composition observed over the mid-Atlantic and the detection of pollution signatures far from source regions, J. Geophys. Res., 112, D10S39, http://dx.doi.org/10.1029/2006JD007584doi:10.1029/2006JD007584, 2007.

Marlon, J. R., Bartlein, P. J., Carcaillet, C., Gavin, D. G., Harrison, S. P., Higuera, P. E., Joos, F., Power, M. J., and Prentice, I. C.: Climate and human influences on global biomass burning over the past two millennia, Nature Geosci., 1, 69–702, 2008.

Morino, Y., Ohara, T., Yokouchi, Y., and Ooki, A.: Comprehensive source apportionment of volatile organic compounds using observational data, two receptor models, and an emission inventory in Tokyo metropolitan area, J. Geophys. Res.-Atmos., 116, D02311, http://dx.doi.org/10.1029/2010JD014762doi:10.1029/2010JD014762, 2011.

Palmer, P. I., Parrington, M., Lee, J. D., Lewis, A. C., Rickard, A. R., Bernath, P. F., Duck, T. J., Waugh, D. L., Tarasick, D. W., Andrews, S., Aruffo, E., Bailey, L. J., Barrett, E., Bauguitte, S. J. B., Curry, K. R., Di Carlo, P., Chisholm, L., Dan, L., Drummond, J. R., Forster, G., Franklin, J. E., Gibson, M. D., Griffin, D., Helmig, D., Hopkins, J. R., Hopper, J. T., Jenkin, M. E., Kindred, D., Kliever, J., Le Breton, M., Matthiesen, S., Maurice, M., Moller, S., Moore, D. P., Oram, D. E., O'Shea, S. J., Owen, R. C., Pagniello, C. M. L. S., Pawson, S., Percival, C. J., Pierce, J. R., Punjabi, S., Purvis, R. M., Remedios, J. J., Rotermund, K. M., Sakamoto, K. M., Strawbridge, K. B., Strong, K., Taylor, J., Trigwell, R., Tereszchuk, K. A., Walker, K. A., Weaver, D., Whaley, C., and Young, J. C.: Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS) experiment: design, execution and science overview, Atmos. Chem. Phys. Discuss., in review, 2013.

Plass-Duelmer, C., Michi, K, Ruf, R., and Berresheim, H.: C2-C$_8$ hydrocarbon measurement and quality control procedures at the Global Atmosphere Watch observatory Hohenpeissenberg, J. Chrom. A, 953, 175–197, 2002.

Pozzer, A., Pollmann, J., Taraborrelli, D., Jöckel, P., Helmig, D., Tans, P., Hueber, J., and Lelieveld, J.: Observed and simulated global distribution and budget of atmospheric C2-C$_5$ alkanes, Atmos. Chem. Phys., 10, 4403–4422, http://dx.doi.org/10.5194/acp-10-4403-2010doi:10.5194/acp-10-4403-2010, 2010.

Read, K. A., Lee, J. D., Lewis, A. C., Moller, S. J., Neves, L. M., and Carpenter, L. J.: Intra-annual cycles of NMVOC in the tropical marine boundary layer and their use for interpreting seasonal variability in CO, J. Geophys. Res., 114, D21303, http://dx.doi.org/10.1029/2009JD011879doi:10.1029/2009JD011879, 2009.

Schultz, M., Rast, S., van het Bolscher, M., Pulles, T., Brand, R., Pereira,~J., Mota, B., Spessa, A., Dalsøren, S., van Nojie, T., and Szopa, S.: Emission data sets~and methodologies for estimating emissions, RETRO project report D1-6, Hamburg, available at: http://retro.enes.org/reports/D1-6_final.pdf, 2007.

Simpson, I. J., Rowland, F. S., Meinardi, S., and Blake, D. R.: Influenceof biomass burning during recent fluctuations in the slow growth of global tropospheric methane, Geophys. Res. Lett., 22, L22808, doi:10.1029/2006GL027330, 2006.

Simpson, I. J., Akagi, S. K., Barletta, B., Blake, N. J., Choi, Y., Diskin, G. S., Fried, A., Fuelberg, H. E., Meinardi, S., Rowland, F. S., Vay, S. A., Weinheimer, A. J., Wennberg, P. O., Wiebring, P., Wisthaler, A., Yang, M., Yokelson, R. J., and Blake, D. R.: Boreal forest fire emissions in fresh Canadian smoke plumes: C$_1$-C$_10$ volatile organic compounds (VOCs), CO2, CO, NO2, NO, HCN and CH3CN, Atmos. Chem. Phys., 11, 6445–6463, http://dx.doi.org/10.5194/acp-11-6445-2011doi:10.5194/acp-11-6445-2011, 2011.

Simpson, I. J., Andersen, M. P. S., Meinardi, S., Bruhwiler, L., Blake, N. J., Rowland, F. S., and Blake, D. R.: Long-term decline of global atmospheric ethane concentrations and implications for methane, Nature, 488,~490–494, 2012.

Sinha, P., Hobbs, P. V., Yokelson, R. J., Bertschi, I. T., Blake, D. R., Simpson, I. J., Gao, S., Kirchstetter, T. W., and Novakov, T.: Emissions of trace gases and particles from savanna fires in southern Africa, J. Geophys. Res., 108, 8487, http://dx.doi.org/10.1029/2002JD002325doi:10.1029/2002JD002325, 2003.

Soja, A. J., Tchebakova, N. M., French, N. H. F., Flannigan, M. D., Shugart, H. H., Stocks, B. J., Sukhinin, A. I., Parfenova, E. I., Chapin III, F. S., and Stackhouse Jr., P. W.: Climate-induced boreal forest change: Predictions versus current observations, Global Planet. Change, 56, 274–296, 2007.

Stroppiana, D., Brivio, P. A., Grégoire, J.-M., Liousse, C., Guillaume, B., Granier, C., Mieville, A., Chin, M., and Pétron, G.: Comparison of global inventories of CO emissions from biomass burning derived from remotely sensed data, Atmos. Chem. Phys., 10, 12173–12189, http://dx.doi.org/10.5194/acp-10-12173-2010doi:10.5194/acp-10-12173-2010, 2010.

Turetsky, M. R., Kane, E. S., Harden, J. W., Ottmar, R. D., Manies, K. L., Hoy. E., and Kasischke, E. S.: Recent acceleration of biomass burning and carbon losses in Alaskan forests and peatlands. Nature Geosci., 4, 27–31, 2011.

Val Martin, M., Logan, J. A., Kahn, R. A., Leung, F.-Y., Nelson, D. L., and Diner, D. J.: Smoke injection heights from fires in North America: analysis of 5 years of satellite observations, Atmos. Chem. Phys., 10, 1491–1510, http://dx.doi.org/10.5194/acp-10-1491-2010doi:10.5194/acp-10-1491-2010, 2010.

van der Werf, G. R., Randerson, J. T., Giglio, L., Collatz, G. J., Mu, M., Kasibhatla, P. S., Morton, D. C., DeFries, R. S., Jin, Y., and van Leeuwen, T. T.: Global fire emissions and the contribution of deforestation, savanna, forest, agricultural, and peat fires (1997–2009), Atmos. Chem. Phys., 10, 11707–11735, http://dx.doi.org/10.5194/acp-10-11707-2010doi:10.5194/acp-10-11707-2010, 2010.

von Schneidemesser, E., Monks, P. S., and Plass-Duelmer, C.: Global comparison of VOC and CO observations in urban areas, Atmos. Environ., 44, 5053–5064, 2010.

Warneke, C., Roberts, J. M., Veres, P., Gilman, J., Kuster, W. C., Burling, I., Yokelson, R., and de Gouw, J. A.: VOC identification and inter-comparison from laboratory biomass burning using PTR-MS and PIT-MS, Int. J. Mass Spectrom., 303, 6–14, http://dx.doi.org/10.1016/j.ijms.2010.12.002doi:10.1016/j.ijms.2010.12.002, 2011.

Wiedinmyer, C., Akagi, S. K., Yokelson, R. J., Emmons, L. K., Al-Saadi, J. A., Orlando, J. J., and Soja, A. J.: The Fire INventory from NCAR (FINN): a high resolution global model to estimate the emissions from open burning, Geosci. Model Dev., 4, 625–641, http://dx.doi.org/10.5194/gmd-4-625-2011doi:10.5194/gmd-4-625-2011, 2011.

WMO/GAW Expert Workshop on Global Long-Term Measurements of Volatile Organic Compounds (VOCs) (Geneva, Switzerland, 30 January–1 February 2006) (WMO Technical Document No. 1373), 2007.

Wotton, B. M., Nock, C. A., and Flannigan, M. D.: Forest fire occurrence and climate change in Canada, Int. J. Wildland Fire, 19, 253–271, 2010.

Yokelson, R. J., Urbanski, S. P., Atlas, E. L., Toohey, D. W., Alvarado, E. C., Crounse, J. D., Wennberg, P. O., Fisher, M. E., Wold, C. E., Campos, T. L., Adachi, K., Buseck, P. R., and Hao, W. M.: Emissions from forest fires near Mexico City, Atmos. Chem. Phys., 7, 5569–5584, http://dx.doi.org/10.5194/acp-7-5569-2007doi:10.5194/acp-7-5569-2007, 2007.

Yokelson, R. J., Christian, T. J., Karl, T. G., and Guenther, A.: The tropical forest and fire emissions experiment: laboratory fire measurements and synthesis of campaign data, Atmos. Chem. Phys., 8, 3509–3527, http://dx.doi.org/10.5194/acp-8-3509-2008doi:10.5194/acp-8-3509-2008, 2008.

Yokelson, R. J., Crounse, J. D., DeCarlo, P. F., Karl, T., Urbanski, S., Atlas, E., Campos, T., Shinozuka, Y., Kapustin, V., Clarke, A. D., Weinheimer, A., Knapp, D. J., Montzka, D. D., Holloway, J., Weibring, P., Flocke, F., Zheng, W., Toohey, D., Wennberg, P. O., Wiedinmyer, C., Mauldin, L., Fried, A., Richter, D., Walega, J., Jimenez, J. L., Adachi, K., Buseck, P. R., Hall, S. R., and Shetter, R.: Emissions from biomass burning in the Yucatan, Atmos. Chem. Phys., 9, 5785–5812, http://dx.doi.org/10.5194/acp-9-5785-2009doi:10.5194/acp-9-5785-2009, 2009.

Yuan, B., Liu, Y., Shao, M., Lu, S., and Streets, D. G.: Biomass Burning Contributions to Ambient VOCs Species at a Receptor Site in the Pearl River Delta (PRD), China. Environ. Sci. Technol., 44, 4577–4582, http://dx.doi.org/10.1021/es1003389doi:10.1021/es1003389, 2010.

Yurganov, L. N., Duchatelet, P., Dzhola, A. V., Edwards, D. P., Hase, F., Kramer, I., Mahieu, E., Mellqvist, J., Notholt, J., Novelli, P. C., Rockmann, A., Scheel, H. E., Schneider, M., Schulz, A., Strandberg, A., Sussmann, R., Tanimoto, H., Velazco, V., Drummond, J. R., and Gille, J. C.: Increased Northern Hemispheric carbon monoxide burden in the troposphere in 2002 and 2003 detected from the ground and from space, Atmos. Chem. Phys., 5, 563–573, http://dx.doi.org/10.5194/acp-5-563-2005doi:10.5194/acp-5-563-2005, 2005.