References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-1017-2008

Temporal variations in black carbon concentrations with different time scales in Helsinki during 1996–2005

Järvi

¹ Junninen

¹ Karppinen

² Hillamo

² Virkkula

² Mäkelä

² Pakkanen

² Kulmala

Department of Physics, University of Helsinki, P.O. Box 64, 00014, University of Helsinki, Finland

Finnish Meteorological Institute, Erik Palmenin aukio 1, 00560 Helsinki, Finland

26 02 2008

8 4 1017 1027

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Variations in black carbon (BC) concentrations over different timescales, including annual, weekly and diurnal changes, were studied during ten years in Helsinki, Finland. Measurements were made in three campaigns between 1996 and 2005 at an urban area locating two kilometres of the centre of Helsinki. The first campaign took place from November 1996 to June 1997, the second from September 2000 to May 2001 and the third from March 2004 to October 2005. A detailed comparison between the campaigns was only made for winter and spring months when data from all campaigns existed. The effect of traffic and meteorological variables on the measured BC concentrations was studied by means of a multiple regression analysis, where the meteorological data was obtained from a meteorological pre-processing model (MPP-FMI). The BC concentrations showed annual pattern with maxima in fall and late winter due to the weakened mixing and enhanced emissions. Between 1996 and 2005, the campaign median BC concentrations decreased slightly from 1.11 to 1.00 μg m−3. The lowest campaign median concentration (0.93 μg m−3) was measured during the second campaign in 2000–2001, when also the lowest traffic rates were measured. The strongest decrease between Campaigns 1 and 3 was observed on weekday daytimes, when also the traffic rates are highest. The variables affecting the measured BC concentrations most were traffic, wind speed and mixing height. On weekdays, traffic had clearly the most important influence before the wind speed and on weekends the effect of wind speed diluted the effect of traffic. The affecting variables and their influence on the BC concentrations were similar in winter and spring. The separate examination of the three campaigns showed that the effect of traffic on the BC concentrations had decreased during the studied years. This reduction was caused by lower emitting vehicles, since between years 1996 and 2005 the traffic rates had increased.

References 1

Arnott, W. P., Hamasha, K., Moosmüller, H., Sheridan, P. J., and Ogren, J. A.: Towards aerosol light absorption measurements with a 7-wavelength Aethalometer: Evaluation with a photoacoustic instrument and 3 wavelength nephelometer, Aerosol Sci. Technol., 39, 17–29, 2005.

Castro, L. M., Pio, C. A., Harrison, R. M., and Smith, D. J. T.: Carbonaceous aerosol in urban and rural European atmospheres: estimation of secondary organic carbon concentrations, Atmos. Environ., 33, 2771–2781, 1999.

Drebs, A., Nordlund, A., Karlsson, P., Helminen, J., and Rissanen, P.: Climatological statistics of Finland 1971–2000 (in Finnish), Finnish Meteorological Institute, Helsinki, 24 pp., 2002.

Hair, J. F., Black, W. C., Babin, B. J., Anderson, R. E., and Tatham, R. L.: Multivariate data analysis (Sixth edition), Pearson Education, New Jersey, Chapter 4, 2006.

Hansen, A. D. A., Rosen, H., and Novakov, T.: The aethalometer: an instrument for real-time measurement of optical absorption by aerosol particles, Sci. Tot. Environ., 36, 191–196, 1984.

Hitzenberger, R. and Tohno, S.: Comparison of black carbon (BC) aerosols in two urban areas – concentrations and size distributions, Atmos. Environ., 35, 2153–2167, 2001.

Hussein, T., Puustinen, A., Aalto, P., Mäkelä, J., Hämeri, K., and Kulmala, M.: Urban aerosol number size distributions, Atmos. Chem. Phys., 4, 391–411, 2004.

Jacobson, M. Z.: Strong radiative heating due to the mixing state of black carbon in atmospheric aerosols, Nature, 409, 695–697, 2001.

Jiang, M., Marr, L., Dunlea, E., Herndon, S., Jayne, J., Kolb, C., Knighton, W., Rogers, T., Zavala, M., Molina, L., and Molina, M.: Vehicle fleet emissions of black carbon, polycyclic aromatic hydrocarbons, and other pollutants measured by a mobile laboratory in Mexico City, Atmos. Chem. Phys., 5, 3377–3387, 2005.

Karppinen, A., Joffre, S. M., and Vaajama, P.: Boundary-layer parameterization for Finnish regulatory dispersion models, Int. J. Environ. Pollut., 8, 557–564, 1997.

Karppinen, A., Joffre, S. M., and Kukkonen J.: The refinement of a meteorological preprocessor for the urban environment, Int. J. Environ. Pollut., 14, 1–9, 2001.

Keeler, G., Morishita, M., and Young, L.-H.: Characterization of complex mixtures in urban atmospheres for inhalation exposure studies, Experimental and Toxicologic Pathology, 57, 19–29, 2005.

Kendall, M., Hamilton, R. S., Watt, J., and Williams, I. D.: Characterisation of selected speciated organic compounds associated with particulate matter in London, Atmos. Environ., 35, 2483–2495, 2001.

Kerminen, V.-M., Mäkelä, T., Ojanen, C., Hillamo, R., Vilhunen, J., Rantanen, L., Havers, N., von Bohlen, A., and Klockow, D.: Characterization of the particulate phase in the exhaust from a diesel car, Environ. Sci. Technol., 31, 1883–1889, 1997.

Khan, A. J., Li, J., and Husain, L.: Atmospheric transport of elemental carbon, J. Geophys. Res., 111, D04303, doi:10.1029/2005JD006505, 2006.

Kupiainen, K. and Klimont, Z.: Primary emissions of fine carbonaceous particles in Europe, Atmos. Environ., 41, 2156–2170, 2007.

Laakso, L., Hussein, T., Aarnio, P., Komppula, M., Hiltunen, V., Viisanen, Y., and Kulmala, M.: Diurnal and annual characteristics of particle mass and number concentrations in urban, rural and Arctic environments in Finland, Atmos. Environ., 37, 2629–2641, 2003.

Lilleberg, I. and Hellman, T.: Traffic development in Helsinki 2005, Helsinki City Planning Department, p. 5, 2006 (in Finnish).

Minoura, H., Takahashi, K., Chow, J. C., and Watson, J. G.: Multi-year trend in fine and coarse particle mass, carbon, and ions in downtown Tokyo, Japan, Atmos. Environ., 40, 2478–2487, 2006.

Novakov, T., Ramanathan, V., Hansen, J. E., Kirchstetter, T. W., Sato, M., Sinton, J. E., and Sathaye, J. A.: Large historical changes of fossil-fuel black carbon aerosols, J. Geophys. Res. Lett., 30, 1324, doi:10.1029/2002GL016345, 2003.

Novakov, T. and Hansen, J. E.: Black carbon emissions in the United Kingdom during the past four decades: an empirical analysis, Atmos. Environ., 38, 4155–4163, 2004.

Pakkanen, T., Kerminen, V.-M., Ojanen, C., Hillamo, R., Aarnio, P., and Koskentalo, T.: Atmospheric black carbon in Helsinki, Atmos. Environ., 34, 1497–1506, 2000.

Pohjola, M., Kousa, A., Aarnio, P., Koskentalo, T., Kukkonen, J., Härkönen, J., and Karppinen, A.: Meteorological interpretation of measured urban PM2.5 and PM10 concentrations in Helsinki metropolitan area, Air pollution VIII, Wessex Institute Press, Southampton, UK, 689–698, 2000.

Pope, C. A., Burnett, R., Thun, M., Calle, E., Krewski, D., Ito, K., and Thurston, G.: Lung cancer, cardiopulmonary mortality, and long term exposure to fine particulate air pollution, J. American Medical Association, 287, 1132–1140, 2002.

Ruellan, S. and Cachier, H.: Characterisation of fresh particulate vehicular exhausts near a Paris high flow road, Atmos. Environ., 35, 453–468, 2001.

Salma, I., Chi, X., and Maenhaut, W.: Elemental and organic carbon in urban canyon and background environments in Budapest, Hungary, Atmos. Environ., 38, 27–36, 2004.

Stoeger, T., Reinhard, C., Takenaka, S., Schroeppel, A., Karg, E., Ritter, B., Heyder, J., and Schulz, H.: Instillation of six different ultrafine carbon particles indicates a surface area threshold dose for acute lung inflammation in mice, Environ. Health Perspect., 114, 328–333, 2006.

Szidat, S., Jenk, T. M., Synal, H.-A., Kalberer, M., Wacker, L., Hajdas, I., Kasper-Giebl, A., and Baltensperger, U.: Contributions of fossil fuel, biomass-burning, and biogenic emissions to carbonaceous aerosols in Zurich as traced by $^14$C, J. Geophys. Res., 111, D07206, doi:10.1029/2005JD006590, 2006.

van Ulden, A. and Holtslag, A.: Estimation of boundary layer parameters for diffusion applications, J. Appl. Meteor., 24, 1196–1207, 1985.

Viidanoja, J., Sillanpää, M., Laakia, J., Kerminen, V.-M., Hillamo, R., Aarnio, P., and Koskentalo, T.: Organic and black carbon in PM$_2.5$ and PM$_10$: 1 year of data from an urban site in Helsinki, Finland, Atmos. Environ., 36, 3183–3193, 2002.

Virkkula, A., Mäkelä, T., Yli-Tuomi, T., Hirsikko A., Koponen, I. K., Hämeri, K., and Hillamo, R.: A simple procedure for correcting loading effects of aethalometer data, J. Air Waste Manage. Assoc., 57, 1214–1222, 2007.

Watson, J. G., Chow, J., Lowenthal, D., Pritchett, L., and Frazier, C.: Differences in the carbon composition of source profiles for diesel- and gasoline-powered vehicles, Atmos. Environ., 28, 2493–2505, 1994.

Weingartner, E., Saathoff, H., Schnaiter, M., Streit, N., Bitnar, B., and Baltensperger, U.: Absorption of light by soot particles: determination of the absorption coefficient by means of aethalometers, J. Aerosol Sci., 34, 1445–1463, 2003.