Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 5 2008 10.5194/acpd-8-17987-2008 http://www.atmos-chem-phys-discuss.net/8/17987/2008/ http://www.atmos-chem-phys-discuss.net/8/17987/2008/acpd-8-17987-2008.html http://www.atmos-chem-phys-discuss.net/8/17987/2008/acpd-8-17987-2008.pdf 17987 18005 2008-10-06 A case study on biomass burning aerosols: effects on solar UV irradiance, retrieval of aerosol single scattering albedo A. Bagheri asadollah.bagheri@phys.ntnu.no B. Kjeldstad B. Johnsen Norwegian University of Science and Technology (NTNU), Department of Physics, 7491 Trondheim, Norway Norwegian Radiation Protection Authority, 1332 Oslo, Norway The aerosol optical depth (AOD) from biomass burning aerosols from eastern Europe was measured in Trondheim, Norway (63.43° N , 10.43° E) in May 2006. The event was observed as far as the Arctic. In the first part of this paper, the surface measurements of direct and global UV radiation (and retrieved AOD) are used to simulate the data using a radiative transfer model. Measured and simulated data were used to study the effect of biomass aerosol on the levels of surface UV radiation. We found reductions of up to 31%, 15% and 2% in direct, global and diffuse surface UV irradiance (at 350 nm, SZA=50°±0.5°) as compared to typical aerosol conditions. In the second part of our study, surface measurements of global and direct irradiance at five wavelength in UVB and UVA (305, 313, 320, 340 and 380 nm) were coupled with a radiative transfer model to produce values of aerosol single scattering albedo, ω. The aerosol single scattering albedo for biomass aerosols is compared to ω for background aerosols. The values of ω for biomass aerosols were 0.76 at 305 nm, 0.75 at 313 nm, 0.79 at 320 nm, 0.72 at 340 nm and 0.80 at 380 nm. Arola, A., Lindfors, A., Natunen, A., and Lehtinen, K. E. J.: A case study on biomass burning aerosols: effects on aerosol optical properties and surface radiation levels, Atmos. Chem. Phys., 7, 4257–4266, 2007. Balis, D. S., Amiridis, V., Zerefos, C., Kazantzidis, A., Kazadzis, S., Bais, A. F., Meleti, C., Gerasopoulos, E., Papayannis, A., Matthias, V., Dier, H., and Andreae, M. O.: Study of the effect of different type of aerosols on UV-B radiation from measurements during EARLINET, Atmos. Chem. Phys., 4, 307–321, 2004. Bernhard, G., Booth, C. R., and Ehramjian, J. C.: Real-time UV and column ozone from multi-channel UV radiometers deployed in the National Science Foundation’s UV monitoring network, Opt. Eng., 44(4), 1–12, 2005. Blumthaler, M. and Ambach, W.: Solar UVB-albedo of various surfaces, Photochem. Photobiol., 48, 85–88, 1988. Booth, C. R., Mestechkina, T., and Morrow, J. H.: in: Errors in the reporting of solar spectral irradiance using moderate bandwidth radiometers: an experimental investigation, edited by: Jaffe, J. S., Proceedings of SPIE, 2258, Ocean Optics XII, 654–663, 1994. Dickerson, R., Kondragunta, S., Stenchikov, G., Civerolo, K., Doddridge, B., and Holben, B.: The impact of aerosols on solar ultraviolet radiation and photochemical smog, Science, 278, 827–830, 1997. Diaz, J. P., Exposito, F. J., Torres, C. J., Carrena, V., and Redondas, A.: Simulations of the mineral dust effect on the UV radiation level, J. Geophys. Res., 105, 4979–4991, 2000. Halthore, R. N., Miller, M. A., Ogren, J. A., Sheridan, P. J., Slaterand, D. W., and Stoffel, T.: Further developments in closure experiments for surface diffuse irradiance under cloud-free skies at a continental site, Geophys. Res. Lett., 31, L07111, doi:10.1029/2003GL019102, 2004. Herman, B. M. and DeLuisi, J. J.: Determination of the effective imaginary term of the complex refractive index of atmospheric dust by remote sensing: The diffuse-direct radiation method, J. Atmos. Sci., 32, 918–925, 1975. Johnsen, B., Kjeldstad, B., Aalerud, T. N., Nilsen, L. T., Schreder, J., Blumthaler, M., Bernhard, G., Topaloglou, C., Meinander, O., Bagheri, A., Slusser, J. R., and Davis, J.: Intercomparison and harmonization of global sky UV Index measurements from multiband filter radiometers, accepted, J. Geophys. Res., 2007. Krotkov, N. A., Bhartia, P. K., Herman, J. R., Fioletov, V., and Kerr, J.: Satellite estimation of spectral surface UV irradiance in the presence of tropospheric aerosols 1. Cloud-free case, J. Geophys. Res., 103(D8), 8779–8794, 1998. Kylling, A., Bais, A., Blumthaler, M., Schreder, J., Zerefos, C., and Kosmidis, E.: Effect of aerosols on solar UV irradiances during the photochemical activity and solar ultraviolet radiation campaign, J. Geophys. Res., 103, 26 051–26 060, 1998. Kylling, A., Persen, T., Mayer, B., and Svenøe, T. Determination of an effective spectral surface albedo from ground-based global and direct UV irradiance measurements, J. Geophys. Res., 105, 4949–4959, 2000. Koepke, P., Schult, M. I., and Shettle E. P.: Global Aerosol Data Set, Max-Planck-Institut für Meteorologie, 243, Hamburg, Germany, 1997. Kalashnikova, O. V., Franklin, P. M., Eldering, A., and Anderson, D.: Application of satellite and ground-based data to investigate the UV radiative effects of Australian aerosols, Remote. Sens. Environ., 107, 65–80, 2007. King, M. D. and Herman, B. M.: Determination of the ground albedo and the index of absorption of atmospheric particulate by remote sensing, I; Theory, J. Atmos. Sci., 36, 163–173, 1979. Liu, S., McKeen, S., and Mandronich, S.: Effect of anthropogenic aerosols on biologically active ultraviolet radiation, Geophys. Res. Lett., 18, 2265–2268, 1991. Latha, K. M. and Badarinath, K. V. S.: Impact of Chemical Fire Accident on Spectral Solar Irradiance over Urban Environment – A Case Study Aerosol and Air Quality Research, 5, 1, 14–24, 2005. Levoni, C., Cervino, M., Guzzi, R., and Torricella, F.: Atmospheric aerosol optical properties: a database of radiative characteristics for different components and classes, Appl. Optics, 36, 30, 1997. Madronich, S.: UV radiation in the natural and perturbed atmosphere, in Environmental Effects of Ultraviolet (UV) Radiation, 17–69, Lewis, Boca Raton, Fla., 1993. Meloni, D., di Sarra, A., Pace, G., and Monteleone, F.: Aerosol optical properties at Lampedusa (Central Mediterranean). 2. Determination of single scattering albedo at two wavelengths for different aerosol types, Atmos. Chem. Phys., 6, 715–727, 2006. Mayer, B. and Kylling, A.: Technical note: The libRadtran software package for radiative transfer calculations – description and examples of use, Atmos. Chem. Phys., 5, 1855–1877, 2005. Molina, L. T. and Molina, M. J.: Absolute absorption cross section of ozone in the 185 to 350 nm wavelength range, J. Geophys. Res., 91(14), 501, 1986. Petters, J. L., Saxena, V. K., Slusser, J. R., Wenny, B. N., and Madronich, S.: Aerosol single scattering albedo retrieved from measurements of surface UV irradiance and a radiative transfer model, J. Geophys. Res., 108(D9), 4288, doi:10.1029/2002JD002360, 2003. Ruggaber, A., Reuder, J., Schwander, H., and Koepke, P.: Spectral ground albedo in the UV-range, paper presented at European Conference on Atmospheric UV Radiation (ECUV), Helsinki, Finland, 1998. Stohl, A., Berg, T., Burkhart, J. F., Fjǽraa, A. M., Forster, C., Herber, A., Hov, Ø., Lunder, C., McMillan, W. W., Oltmans, S., Shiobara, M., Simpson, D., Solberg, S., Stebel, K., Ström, J., Tørseth, K., Treffeisen, R., Virkkunen, K., and Yttri, K. E.: Arctic smoke – record high air pollution levels in the European Arctic due to agricultural fires in Eastern Europe in spring 2006, Atmos. Chem. Phys., 7, 511–534, 2007. Slapper, H., Reinen, H. A. J. M., Blumthaler, M., Huber, M., and Kuik, F.: Comparing ground-level spectrally resolved solar UV measurements using various instruments: A technique resolving effects of wavelengt shift and slit width, Geophys. Res. Lett., 22, 20, 2721–2724, 1995. Stamnes, K., Tsay, S., Wiscombe, W., and Jayaweera, K.: A numerically stable algorithm for discrete-ordinate-method radiative transfer in multiple scattering and emitting layered media, Appl. Optics, 27, 2502–2509, 1988. Schwander H., Koepke, P., and Ruggaber, A.: Uncertainties in modeled 10 UV irradiances due to limited accuracy and availability of input data, J. Geophys. Res., 102, 9419–9429, 1997. Shettle, E. P.: Models of aerosols, clouds and precipitation for atmospheric propagation studies, Atmospheric Propagation in the UV, Visible, IR and mm-region and Related System Aspects, AGARD Conf. Proc., 454, 1989. Webb, A., Gröbner, J. M., and Blumthaler, A: Practical Guide to Operating Broadband Instruments Measuring Erythemally Weighted Irradiance, Produced by the joint efforts of WMO SAG UV and Working Group 4 of COST−726 Action Long Term Changes and Climatology of UV Radiation over Europe, 2006. Weihs, P. and Webb, A. R.: Accuracy of spectral UV model calculations 1. Consideration of uncertainties in input parameters, J. Geophys. Res., 102 (D1), 1541–1550, 1997.