ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-4239-2009 Effects of the 2006 El Niño on tropospheric ozone and carbon monoxide: implications for dynamics and biomass burning Chandra S. 1 2 Ziemke J. R. 1 2 Duncan B. N. 1 2 Diehl T. L. 1 2 Livesey N. J. 3 Froidevaux L. 3 Goddard Earth Sciences and Technology Center, University of Maryland Baltimore County, Baltimore, MD, USA NASA Goddard Space Flight Center, Greenbelt, MD, USA NASA Jet Propulsion Laboratory, Pasadena, CA, USA 02 07 2009 9 13 4239 4249 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.net/9/4239/2009/acp-9-4239-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/4239/2009/acp-9-4239-2009.pdf

We have studied the effects of the 2006 El Niño on tropospheric O<sub>3</sub> and CO at tropical and sub-tropical latitudes measured from the OMI and MLS instruments on the Aura satellite. The 2006 El Niño-induced drought caused forest fires (largely set to clear land) to burn out of control during October and November in the Indonesian region. The effects of these fires are clearly seen in the enhancement of CO concentration measured from the MLS instrument. We have used a global model of atmospheric chemistry and transport (GMI CTM) to quantify the relative importance of biomass burning and large scale transport in producing observed changes in tropospheric O<sub>3</sub> and CO. The model results show that during October and November biomass burning and meteorological changes contributed almost equally to the observed increase in tropospheric O<sub>3</sub> in the Indonesian region. The biomass component was 4–6 DU but it was limited to the Indonesian region where the fires were most intense. The dynamical component was 4–8 DU but it covered a much larger area in the Indian Ocean extending from South East Asia in the north to western Australia in the south. By December 2006, the effect of biomass burning was reduced to zero and the observed changes in tropospheric O<sub>3</sub> were mostly due to dynamical effects. The model results show an increase of 2–3% in the global burden of tropospheric ozone. In comparison, the global burden of CO increased by 8–12%.

 References Bloom, S. C., da Silva, A. M., Dee, D. P., et al.: The Goddard Earth Observation System Data Assimilation System, GEOS DAS Version 4.0.3: Documentation and Validation, NASA TM-2005-104606 V26, 2005. Chandra, S., Ziemke, J. R., Min, W., and Read, W. G.: Effects of 1997-1998 El Niño on tropospheric ozone and water vapor, Geophys. Res. Lett., 25, 3867–3870, 1998. Chandra, S., Ziemke, J. R., Bhartia, P. K., et al.: Tropical tropospheric ozone: Implications for dynamics and biomass burning, J. Geophys. Res., 107(D14), 4188, doi:10.1029/2001JD000447, 2002. Chandra, S., Ziemke, J. R., and Martin, R. V.: Tropospheric ozone at tropical and middle latitudes derived from TOMS/MLS residual: Comparison with a global model, J. Geophys. Res., 108(D9), 4291, doi:10.1029/2002JD002912, 2003. Chandra, S., Ziemke, J. R., Schoeberl, M. R., et al.: Effects of the 2004 El Niño on tropospheric ozone and water vapor, Geophys. Res. Lett., 34, L06802, doi:10.1029/2006GL028779, 2007. Doherty, R. M., Stevenson, D. S., Johnson, C. E., et al.: Tropospheric ozone and El Niño-Southern Oscillation: Influence of atmospheric dynamics, biomass burning emissions, and future climate change, J. Geophys. Res., 111, D19304, doi:10.1029/2005JD006849, 2006. Duncan, B. N., Martin, R. V., Staudt, A., et al.: Inter-annual and seasonal variability of biomass burning emissions constrained by satellite observations, J. Geophys. Res., 108, 4100, doi:10.1029/2002JD002378, 2003. Duncan, B., Strahan, S. E., Yoshida, Y., Steenrod, S. D., and Livesey, N.: Model Study of the Cross-Tropopause Transport of Biomass Burning Pollution, Atmos. Chem. Phys., 7, 3713–3736, 2007. Duncan, B. N., West, J. J., Yoshida, Y., Fiore, A. M., and Ziemke, J. R.: The influence of European pollution on ozone in the Near East and northern Africa, Atmos. Chem. Phys., 8, 2267–2283, 2008. Fishman, J., Creilson, J. K., Wozniak, A. E., et al.: Interannual variability of stratospheric and tropospheric ozone determined from satellite measurements, J. Geophys. Res., 110, D20306, doi:10.1029/2005JD005868, 2005. Froidevaux, L., Jiang, Y. B., Lambert, A., et al.: Validation of Aura Microwave Limb Sounder stratospheric ozone measurements, J. Geophys. Res., 113(D15), D15S20, doi:10.1029/2007JD008771, 2008. Fujiwara, M., Kita, K., Kawakami, S., et al.: Tropospheric ozone enhancements during the Indonesian forest fire events in 1994 and in 1997 as revealed by ground-based observations, Geophys. Res. Lett., 26, 2417–2420, 1999. Guenther, A., Karl, T., Harley, P., et al.: Estimates of global terrestrial isoprene emissions using MEGAN (Model of Emissions of Gases and Aerosols from Nature), Atmos. Chem. Phys., 6, 3181–3210, 2006. Jacobson, M.: Computaton of global photochemistry with SMVGEAR II, Atmos. Environ., 29, 3541–2546, 1995. Kroon, M., Petropavlovskikh, I., Shetter, R. E., Hall, S., Ullmann, K., Veefkind, J. P., McPeters, R. D., Browell, E. V., and Levelt, P.: OMI Total Ozone Column Validation with Aura-AVE CAFS Observations, J. Geophys. Res., 113(D16), D15S13, doi:10.1029/2007JD008795, 2008a. Kroon, M., Veefkind, J. P., Sneep, M., McPeters, R. D., Bhartia, P. K., and Levelt, P.: Comparing OMI-TOMS and OMI-DOAS total ozone column data, J. Geophys. Res., 113(D16), D16S28, doi:10.1029/2007JD008798, 2008b. Levelt, P. F., Hilsenrath, E., Leppelmeier, G. W., et al.: Science objectives of the Ozone Monitoring Instrument, IEEE Geosci. Remote S., 44(5), 1199–1208, 2006. Livesey, N. J., Filipiak, M. J., Froidevaux, L., et al.: Validation of Aura Microwave Limb Sounder O-3 and CO observations in the upper troposphere and lower stratosphere, J. Geophys. Res., 113(D15), D15S02, doi:10.1029/2007JD008805, 2008. Logan, J. A., Megretskaia, I., Nassar, R., et al.: Effects of the 2006 El Niño on tropospheric composition as revealed by data from the Tropospheric Emission Spectrometer (TES), Geophys. Res. Lett., 35, L03816, doi:10.1020/2007GL031698, 2008. Martin, R.V., Jacob, D. J., Logan, J. A., et al.: Interpretation of TOMS observations of tropical tropospheric ozone with a global model and in-situ observations, J. Geophys. Res., 107(D18), 4351, doi:10.1029/2001JD001480, 2002. McPeters, R. D., Kroon, M., Labow, G. J., Brinksma, E., Balis, D., Petropavlovskikh, I., Veefkind, J. P., Bhartia, P. K., and Levelt, P.: Validation of the Aura Ozone Monitoring Instrument Total Column Ozone Product, J. Geophys. Res., 113(D15), D15S14, doi:10.1029/2007JD008802, 2008. Peters, W., Krol, M., Dentener, F., et al.: Identification of an El Nino-Southern Oscillation signal in a multiyear global simulation of tropospheric ozone, J. Geophys. Res., 106(D10), 10 398–10 402, 2001. Schoeberl, M. R., Duncan, B. N., Douglass, A., Waters, J., Livesey, N., Read, W., and Filipiak, M.: The Carbon Monoxide Tape Recorder, Geophys. Res. Lett., 33(12), L12811, doi:10.1029/2006GL026178, 2006. Schoeberl, M. R., Ziemke, J. R., Bojkov, B., Livesy, N., Duncan, B. N., et al.: A trajectory-based estimate of the tropospheric ozone column using the residual method, J. Geophys. Res., 112, D24S49, doi:10.1029/2007JD008773, 2007. Strahan, S. E., Duncan, B. N., and Hoor, P.: Observationally-derived diagnostics of transport in the lowermost stratosphere and their application to the GMI chemistry transport model, Atmos. Chem. Phys., 7, 2435–2445, 2007. Sudo, K. and Takahashi, M.: Simulation of tropospheric ozone changes during 1997-1998 El Niño: Meteorological impact on tropospheric photochemistry, Geophys. Res. Lett., 28, 4091–4094, 2001. Thompson, A. M., Witte, J. C., Hudson, R. D., et al.: Tropical tropospheric ozone and biomass burning, Science, 291, 2128–2132, 2001. Zeng, G. and Pyle, J. A.: Influence of El Niño Southern Oscillation on stratosphere/troposphere exchange and the global tropospheric ozone budget, Geophys. Res. Lett., 32, L01814, doi:10.1029/2004GL021353, 2005. Ziemke, J. R., Chandra, S., and Bhartia, P. K.: A new NASA data product: Tropospheric and stratospheric column ozone in the tropics derived from TOMS measurements, B. Am. Meteorol. Soc., 81, 580–583, 2000. Ziemke, J. R. and Chandra, S.: La Nina and El Nino induced variabilities of ozone in the tropical lower atmosphere during 1970-2001, Geophys. Res. Lett., 30(3), 1142, doi:10.1029/2002GL016387, 2003. Ziemke, J. R., Chandra, S., and Bhartia, P. K.: A 25-year data record of atmospheric ozone from TOMS Cloud Slicing: Implications for trends in stratospheric and tropospheric ozone, J. Geophys. Res., 110, D15105, doi:10.1029/2004JD005687, 2005. Ziemke, J. R., Chandra, S., Duncan, B. N., Froidevaux, L., Bhartia, P. K., Levelt, P. F., and Waters, J. W.: Tropospheric ozone determined from Aura OMI and MLS: Evaluation of measurements and comparison with the Global Modeling Initiative's Chemical Transport Model, J. Geophys. Res., 111(D19), D19303, doi:10.1029/2006JD007089, 2006.