ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-11-6531-2011 Microwave Limb Sounder observations of biomass-burning products from the Australian bush fires of February 2009 Pumphrey H. C. 1 Santee M. L. 2 Livesey N. J. 2 Schwartz M. J. 2 Read W. G. 2 School of GeoSciences, The University of Edinburgh, Edinburgh, UK NASA Jet Propulsion Laboratory, Pasadena, CA, USA 23 02 2011 11 2 6531 6554 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. This article is available from http://www.atmos-chem-phys-discuss.net/11/6531/2011/acpd-11-6531-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/11/6531/2011/acpd-11-6531-2011.pdf

The large bush fires which occurred in southeast Australia in February 2009 were unusually destructive. However, they were also unusual in the amounts of various combustion products which were injected directly into the stratosphere. We report the observations by the Microwave Limb Sounder (MLS) instrument on the Aura satellite of some of these combustion products. The highest quality observations are of CO; these clearly show a large region of enhanced mixing ratios to the north of New Zealand which remains in that region for about ten days before drifting westwards and finally dissipating over the Atlantic about a month after the fire. Back trajectories run from the points where MLS observes enhanced CO pass close to the site of the fire. The MLS observations of CH<sub>3</sub>CN and HCN resemble those of CO except for their poorer vertical resolution and more limited vertical range. An apparent enhancement in ClO is also observed by MLS, but detailed analysis of the measured radiances reveals this feature to be a signature of CH<sub>3</sub>OH, which is not currently retrieved by the MLS data processing system. The fires of February 2009 are the only event of this type and magnitude in the 6-yr MLS record.

 References Andreae, M O. and Merlet, P.: Emission of trace gases and aerosols from biomass burning, Global Biogeochem. Cy., 15, 955–966, 2001. Christian, T J., Kleiss, B., Yokelson, R Y., Holzinger, R., Crutzen, P J., Hao, W M., Saharjo, B H., and Ward, D E.: Comprehensive laboratory neasurements of biomass-burning emissions: 1. Emissions from Indonesian, African and other fuels, J. Geophys. Res., 108, 4719, http://dx.doi.org/10.1029/2003JD003704doi:10.1029/2003JD003704, 2003. Fromm, M D. and Servranckx, R.: Transport of forest fire smoke above the tropopause by supercell convection, Geophys. Res. Lett., 30, 1542, http://dx.doi.org/10.1029/2002GL016820doi:10.1029/2002GL016820, 2003. Fromm, M., Lindsey, D T., Servranckx, R., Yue, G., Trickl, T., Sica, R., Doucet, P., and Godin-Beekmann, S.: The Untold Story of Pyrocumulonimbus, Bull. Am. Meteorol. Soc., 91, 1193–1209, http://dx.doi.org/10.1175/2010BAMS3004.1doi:10.1175/2010BAMS3004.1, 2010. Li, Q., Jacob, D J., Yantosca, R M., Heald, C L., Singh, H B., Koike, M., Zhao, Y., Sachse, G W., and Streets, D G.: A global three-dimensional model analysis of the atmospheric budgets of HCN and CH<sub>3</sub>CN: Constraints from aircraft and ground measurements, J. Geophys. Res, 108, 8827, http://dx.doi.org/10.1029/2002JD003075doi:10.1029/2002JD003075, 2003. Livesey, N J., Fromm, M D., Waters, J W., Manney, G L., Santee, M L., and Read., W G.: Enhancements in lower stratospheric CH<sub>3</sub>CN observed by UARS MLS following boreal forest fires., J. Geophys. Res., 109, D06308, http://dx.doi.org/10.1029/2003JD004055doi:10.1029/2003JD004055, 2004. Livesey, N J., Snyder, W V., Read, W G., and Wagner, P A.: Retrieval algorithms for the EOS Microwave Limb Sounder (MLS) instrument, IEEE T. Geosci. Remote Sens., 44, 1144–1155, 2006. Livesey, N J., Read, W G., Lambert, A., Cofield, R E., Cuddy, D T., Froidevaux, L., Fuller, R A., Jarnot, R F., Jiang, J H., Jiang, Y B., Knosp, B W., Kovalenko, L J., Pickett, H M., Pumphrey, H C., Santee, M L., Schwartz, M J., Stek, P C., Wagner, P A., Waters, J W., and Wu., D L.: Earth Observing System (EOS) Aura Microwave Limb Sounder (MLS) Version 2.2 Level 2 data quality and description document., Tech. Rep. JPL D-33509, NASA Jet Propulsion Laboratory California Institute of Technology, Pasadena, California, 91109-8099, prefixhttp://mls.jpl.nasa.gov, 2007. Livesey, N J., Filipiak, M., Froidevaux, L., Read, W., Lambert, A., Santee, M., Jiang, J., Pumphrey, H., Waters, J., Cofield, R., Cuddy, D., Daffer, W., Drouin, B., Fuller, R., Jarnot, R., Jiang, Y., Knosp, B., Li, Q., Perun, V., Schwartz, M., Snyder, W., Stek, P., Thurstans, R., Wagner, P., Avery, M., Browell, E., Cammas, J.-P., Christensen, L., Diskin, G., Gao, R.-S., Jost, H.-J., Loewenstein, M., Lopez, J., Nedelec, P., Osterman, G., Sachse, G., and Webster, C.: Validation of Aura Microwave Limb Sounder O<sub>3</sub> and CO observations in the upper troposphere and lower stratosphere, J. Geophys. Res, 113, D15S02, http://dx.doi.org/10.1029/2007JD008805doi:10.1029/2007JD008805, 2008. Paton-Walsh, C., Wilson, S R., Jones, N B., and Griffith, D. W T.: Measurement of Methanol Emissions from Australian Wildfires by Ground-based Solar Fourier Transform Spectroscopy, Geophys. Res. Lett., 35, L01880, http://dx.doi.org/10.1029/2007GL032951doi:10.1029/2007GL032951, 2008. Pumphrey, H C., Jimenez, C J., and Waters, J W.: Measurement of HCN in the middle atmosphere by EOS MLS, Geophys. Res. Lett., 33, L08804, http://dx.doi.org/10.1029/2005GL025656doi:10.1029/2005GL025656, 2006. Pumphrey, H C., Filipiak, M J., Livesey, N J., Schwartz, M J., Boone, C., Walker, K A., Bernath, P., Ricaud, P., Barret, B., Clerbaux, C., Jarnot, R F., Kovalenko, L J., Manney, G L., and Waters, J W.: Validation of middle-atmosphere carbon monoxide retrievals from MLS on Aura, J. Geophys. Res., 112, D24S38, http://dx.doi.org/10.1029/2007JD008723doi:10.1029/2007JD008723, 2007. Pumphrey, H C., Boone, C., Walker, K A., Bernath, P., and Livesey, N J.: Tropical tape recorder observed in HCN, Geophys. Res. Lett, 35, L05801, http://dx.doi.org/10.1029/2007GL032137doi:10.1029/2007GL032137, 2008. Rinsland, C P., Boone, G. D. C D., Bernath, P F., and Chiou, L.: Atmospheric Chemistry Experiment (ACE) measurements of elevated Southern Hemisphere upper tropospheric CO, C2H6, HCN, and C2H2 mixing ratios from biomass burning emissions and long-range transport, Geophys. Res. Lett., 32, L20803, http://dx.doi.org/10.1029/2005GL024214doi:10.1029/2005GL024214, 2005. Rinsland, C P., Dufour, G., Boone, C D., Bernath, P F., Chiou, L., Pierre-Fran c C., Turquety, S., and Clerbaux, C.: Satellite boreal measurements over Alaska and Canada during June–July 2004: Simultaneous measurements of upper tropospheric CO, C<sub>2</sub>H$_6$, HCN, CH<sub>3</sub>Cl, CH<sub>4</sub>, C<sub>2</sub>H<sub>2</sub>, CH<sub>3</sub>OH, HCOOH, OCS, and SF$_6$ mixing ratios, Global Biogeochem. Cy., 21, GB3008, http://dx.doi.org/10.1029/2006GB002795doi:10.1029/2006GB002795, 2007. Santee, M L., Lambert, A., Read, W G., Livesey, N J., Manney, G L., Cofield, R E., Cuddy, D T., Daffer, W H., Drouin, B J., Froidevaux, L., Fuller, R A., Jarnot, R F., Knosp, B W., Perun, V S., Snyder, W V., Stek, P C., Thurstans, R P., Wagner, P A., Waters, J W., Connor, B., Urban, J., Murtagh, D., Ricaud, P., Barret, B., Kleinbohl, A., Kuttippurath, J., Kullmann, H., von Hobe, M., Toon, G C., and Stachnik, R A.: Validation of the Aura Microwave Limb Sounder ClO measurements, J. Geophys. Res., 113, D15S22, http://dx.doi.org/10.1029/2007JD008762doi:10.1029/2007JD008762, 2008. Schoeberl, M R., Douglass, A R., Hilsenrath, E., Bhartia, P K., Barnett, J., Beer, R., Waters, J., Gunson, M., Froidevaux, L., Gille, J., Levelt, P F., and DeCola, P.: Overview of the EOS Aura Mission, IEEE T. Geosci. Remote, 44, 1066–1074, 2006. Sembhi, H.: Paper in preparation, Atmos. Meas. Tech., 2011. Siddaway, J. and Petelina, S.: Transport and evolution of the 2009 Australian Black Saturday bushfire smoke in the lower stratosphere, J. Geophys. Res, in press, http://dx.doi.org/10.1029/2010JD015162doi:10.1029/2010JD015162, 2011. Singh, H B., Salas, L., Herlth, D., Kolyer, R., Czech, E., Viezee, W., Li, Q., Jacob, D J., Blake, D., Sachse, G., Harward, C N., Fuelberg, H., Kiley, C M., and Kondo, Y. Z Y.: In situ measurements of HCN and CH<sub>3</sub>CN over the pacific ocean: Sources, sinks and budgets, J. Geophys. Res., 108, 8795, http://dx.doi.org/10.1029/2002JD003006doi:10.1029/2002JD003006, 2003. Teague, B., McLeod, D., and Pascoe, S.: 2009 Victorian Bushfires Royal Comission – Final Report, Tech. rep., 2009 Victorian Bushfires Royal Comission, prefixhttp://www.royalcommission.vic.gov.au, 2010. Waters, J W., Froidevaux, L., Harwood, R., Jarnot, R., Pickett, H., Read, W., Siegel, P., Cofield, R., Filipiak, M., Flower, D., Holden, J., Lau, G., Livesey, N., Manney, G., Pumphrey, H., Santee, M., Wu, D., Cuddy, D., Lay, R., Loo, M., Perun, V., Schwartz, M., Stek, P., Thurstans, R., Boyles, M., Chandra, S., Chavez, M., Chen, G.-S., Chudasama, B., Dodge, R., Fuller, R., Girard, M., Jiang, J., Jiang, Y., Knosp, B., LaBelle, R., Lam, J., Lee, K., Miller, D., Oswald, J., Patel, N., Pukala, D., Quintero, O., Scaff, D., Snyder, W., Tope, M., Wagner, P., and Walch, M.: The Earth Observing System Microwave Limb Sounder (EOS MLS) on the Aura satellite, IEEE T. Geosci. Remote Sens., 44, 1106–1121, 2006. Winker, D M., Pelon, J., Jr., J. A C., Ackerman, S A., Charlson, R J., Colarco, P R., Flamant, P., Fu, Q., Hoff, R M., Kittaka, C., Kubar, T L., Treut, H L., McCormick, M P., Mégie, G., Poole, L., Powell, K., Trepte, C., Vaughan, M A., and Wielicki, B A.: The CALIPSO Mission: A Global 3D View of Aerosols and Clouds, Bull. Am. Meteorol. Soc., 91, 1211–1229, http://dx.doi.org/10.1175/2010BAMS3009.1doi:10.1175/2010BAMS3009.1, 2010.