Abstract:

A long-term (2000-2005) monitoring of aerosol data from the moderate resolution imaging spectroradiometer (MODIS) is analyzed focusing on the Greater Athens Area (GAA) in the Eastern Mediterranean region. The MODIS aerosol optical depth standard product (AOD at 550 nm) and its respective ratio attributed to fine-mode (FM) particles are employed to evaluate the seasonal variability of the aerosol properties over Athens. The climatological trend of both parameters in the period 2000-2005 is nearly absent, while remarkable year-to-year variability can be observed. The seasonal analysis reveals a significant AOD variability over Athens, with minimum values in winter (AOD550 ∼ 0.2), and maximum in summer (AOD550 ∼ 0.45). Regarding the FM fraction, maximum values are present in spring and minimum in summer, thus revealing the dominance of FM and coarse-mode particles, respectively. For the whole data set, a method is implemented to distinguish the main aerosol types (urban/industrial (hereafter UI), clean maritime (hereafter CM type) and desert dust (hereafter DD) over Athens, based on both AOD and FM values. Because of the mixing processes in the atmosphere the majority of the cases (46.6%) belong to a mixed (hereafter MT) aerosol type. The UI aerosols are more frequent in spring (41.2%) and less in winter (9.1%), while the coarse particles, probably DD, more frequent in summer (35.8%) and less in winter (3.5%). In contrast, the clean atmospheric conditions are more frequent in winter (23.9%), when the mixing processes are also well established (63.5%). For each aerosol type, the mean AOD550 and FM values are also computed. Their seasonal variability exhibits a clear summer maximum for UI, CM and MT aerosols, while the DD exhibits maximum in spring. As regards the FM values of the different aerosol types they exhibit a rather constant variation with small fluctuations from season to season. © 2007 Elsevier Ltd. All rights reserved.

Notes:

Atmos. Environ.Cited By (since 1996):31Export Date: 13 October 2014CODEN: AENVECorrespondence Address: Kaskaoutis, D.G.; Atmospheric Research Team, Institute for Environmental Research and Sustainable Development, National Observatory of Athens, P.O. Box 20048, Lofos Nymphon, GR-11810 Athens, Greece; email: dkask@meteo.noa.grReferences: Adamopoulos, A.D., Kambezidis, H.D., Zevgolis, D., Topalis, F.B., Estimation of total ozone column over Athens, Greece, using ground-based beam solar irradiance measurements (2000) Fresenius Environmental Bulletin, 9, pp. 201-208; Amiridis, V., Balis, D.S., Kazadzis, S., Bais, A., Giannakaki, E., Papayannis, A., Zerefos, C., Four-year aerosol observations with a Raman lidar at Thessaloniki, Greece, in the framework of European aerosol research lidar network (EARLINET) (2005) Journal of Geophysical Research, 110. , 10.1029/2005JD006190; Antoine, D., Nobileau, D., Recent increase of Saharan dust transport over the Meditterenean Sea, as revealed from ocean color satellite (SeaWiFS) observations (2006) Journal of Geophysical Research, 111, pp. D12214. , 10.1029/2005JD006795; Balis, D.S., Amiridis, V., Zerefos, C.S., Gerasopoulos, E., Andrae, M., Zanis, P., Kazantzidis, A., Papayannis, A., Raman lidar and sunphotometric measurements of aerosol optical properties over Thessaloniki, Greece during a biomass-burning episode (2003) Atmospheric Environment, 37, pp. 4529-4538; Barnaba, F., Gobbi, G.P., Aerosol seasonal variability over the Mediterranean region and relative impact of maritime, continental and Saharan dust particles over the basin from MODIS data in the year 2001 (2004) Atmospheric Chemistry and Physics, 4, pp. 2367-2391; Chin, M., Chu, A., Levy, R., Remer, L., Kaufman, Y., Holben, B., Eck, T., Gao, Q., Aerosol distribution in the northern hemisphere during ACE-Asia: results from global model, satellite observations, and sun photometer measurements (2004) Journal of Geophysical Research, 109. , 10.1029/2004JD004829; Chu, D.A., Kaufman, Y.J., Ichoku, C., Remer, L.A., Tanrè, D., Holben, B.N., Validation of MODIS aerosol optical depth retrieval overland (2002) Geophysical Research Letters, 29. , 10.1029/2001GL013205; Chu, D.A., Kaufman, Y.J., Zibordi, G., Chem, J.D., Mao, J., Li, C., Holben, B.N., Global monitoring of air pollution over land from the earth observing system-Terra moderate resolution imaging spectroradiometer (MODIS) (2003) Journal of Geophysical Research, 108 (D21), p. 4661. , 10.1029/2002JD003179; Dulac, F., Tanrè, D., Bergametti, G., Buat-Ménard, P., Desbois, M., Sutton, D., Assessment of the african airborne dust mass over the western Mediterranean sea using meteosat data (1992) Journal of Geophysical Research, 97, pp. 2489-2506; Duncan, B.N., Bey, I., A modeling study of the export pathways of pollution from Europe: seasonal and interannual variations (1987-1997) (2004) Journal of Geophysical Research, 109, pp. D08301. , 10.1029/JD004079; Formenti, P., Andreae, M.O., Andreae, T.W., Galani, E., Vasaras, A., Zerefos, C., Amiridis, V., Lelieveld, J., Aerosol optical properties and large-scale transport of air mass: observations at a coastal and a semiarid site in the eastern Mediterranean during summer 1998 (2001) Journal of Geophysical Research, 106, pp. 9807-9826; Fotiadi, A., Hatzianastassiou, N., Drakakis, E., Matsoukas, C., Pavlakis, K.G., Hatzidimitriou, D., Gerasopoulos, E., Vardavas, I., Aerosol physical and optical properties in the eastern Mediterranean basin, Crete, from aerosol robotic network data (2006) Atmospheric Chemistry and Physics, 6, pp. 5399-5413; Gerasopoulos, E., Andreae, M.O., Zerefos, C.S., Andreae, T.W., Balis, D., Formenti, P., Merlet, P., Parastefanou, C., Climatological aspects of aerosol optical properties in northern Greece (2003) Atmospheric Chemistry and Physics, 3, pp. 2025-2041; Giavis, G.M., Kambezidis, H.D., Sifakis, N., Tóth, Z., Adamopoulos, A.D., Zevgolis, D., Diurnal variation of the aerosol optical depth for two distinct cases in the Athens area, Greece (2005) Atmospheric Research, 78, pp. 79-92; Hatzianastassiou, N., Katsoulis, B., Vardavas, I., Sensitivity analysis of aerosol direct radiative forcings in the ultraviolet-visible wavelengths and consequences for the heat budget (2004) Tellus, 56 B, pp. 368-381; Hutchison, K., Application of MODIS satellite data and products for monitoring air quality in the state of Texas (2003) Atmospheric Environment, 37, pp. 2403-2412; Ichoku, C., Chu, D.A., Matoo, S., Kaufman, Y.J., Remer, L.A., Tanrè, D., Slutsker, I., Holben, B., A spatio-temporal approach for global validation and analysis of MODIS aerosol products (2002) Geophysical Research Letters, 29. , 10.1029/2001GL013206; Israelevich, P.L., Levin, Z., Joseph, J.H., Ganor, E., Desert aerosol transport in the Mediterranean region as inferred from the TOMS aerosol index (2002) Journal of Geophysical Research, 107 (D21), p. 4572; Israelevich, P.L., Ganor, E., Levin, Z., Joseph, J.H., Annual variations of physical properties of desert dust over Israel (2003) Journal of Geophysical Research, 108 (D13), p. 4881. , 10.1029/2002/JD003163; Kalivitis, N., Gerasopoulos, E., Vrekousis, M., Kouvarakis, G., Kubilay, N., Hatzianastassiou, N., Vardavas, I., Mihalopoulos, N., Dust transport over the Eastern Mediterranean from TOMS, AERONET and surface measurements (2007) Journal of Geophysical Research, 112, pp. D03202. , 10.1029/2006JD007510; Kambezidis, H.D., Tulleken, R., Amanatidis, G.T., Paliatsos, A.G., Asimakopoulos, D.N., Statistical evaluation of selected air pollutants in Athens, Greece (1995) Environmentics, 6, pp. 349-361; Kaskaoutis, D.G., Kambezidis, H.D., Checking the validity of the Ångström's formula with spectral data of direct-beam irradiance obtained in Athens, Greece (2006) Atmospheric Research, 79, pp. 67-87; Kaskaoutis, D.G., Kambezidis, H.D., Investigation on the wavelength dependence of the aerosol optical depth in the Athens area (2006) Quarterly Journal of the Royal Meteorological Society, 132, pp. 2217-2235; Katsoulis, B.D., Makroyannis, T.J., Goutsidou, Y.A., Monthly anticyclonicity in southern Europe and the Mediterranean region (1998) Theoretical and Applied Climatology, 59, pp. 51-59; Kaufman, Y.J., Tanrè, D., Boucher, O., A satellite view of aerosols in the climate system (2002) Nature, 419, pp. 215-223; Lelieveld, J., Global air pollution crossroads over the Mediterranean (2002) Science, 298, pp. 794-999; Meloni, D., di Sarra, A., Biavati, G., DeLuisi, J.J., Monteleone, F., Pace, G., Piacentino, S., Sferlazzo, D.M., Seasonal behavior of Saharan dust events at the Mediterranean island of Lampedusa in the period 1999-2005 (2007) Atmospheric Environment, 41, pp. 3041-3056; Metaxas, D.A., Bartzokas, A., Pressure covariability over the Atlantic, Europe and N. Africa-application: centers of action for temperature, winter precipitation and summer winds in Athens, Greece (1994) Theoretical and Applied Climatology, 49, pp. 9-18; Moulin, C., Lambert, C.E., Dayan, U., Satellite climatology of African dust transport in Mediterranean atmosphere (1998) Journal of Geophysical Research, 103, pp. 13137-13144; Pace, G., di Sarra, A., Meloni, D., Piacentino, S., Chamard, P., Aerosol optical properties at Lampedusa (Central Mediterranean). 1. Influence of transport and identification of different aerosol types (2006) Atmospheric Chemistry and Physics, 6, pp. 697-713; Papayannis, A., Balis, D., Bais, A., Van Der Berch, H., Calpini, B., Durieux, E., Fiorani, L., Zerefos, C.S., Role of urban and suburban aerosol on solar UV radiation over Athens Greece (1998) Atmospheric Environment, 32, pp. 2193-2201; Papayannis, A., Balis, D., Amiridis, V., Chourdakis, G., Tsaknakis, G., Zerefos, C.S., Castanho, A.D.A., Grabowski, J., Measurements of Saharan dust aerosols over the eastern Mediterranean using elastic backscatter-Raman lidar, spectrophotometric and satellite observations in the frame of the EARLINET project (2005) Atmospheric Chemistry and Physics, 5, pp. 2065-2079; Perrone, M.R., Santese, M., Tafuro, A.M., Holben, B., Smirnov, A., Aerosol load characterization over south-east Italy for one year of AERONET sun-photometer measurements (2005) Atmospheric Research, 75, pp. 111-133; Remer, L.A., Tanrè, D., Kaufman, Y.J., Ichoku, C., Matoo, S., Levy, R., Chu, D.A., Li, R.R., Validation of MODIS aerosol retrieval over ocean (2002) Geophysical Research Letters, 29. , 10.1029/2001GL013204; Smirnov, A., Holben, B.N., Kaufman, Y.J., Dubovic, O., Eck, T.F., Slutsker, I., Pietras, C., Halthore, R.N., Optical properties of atmospheric aerosol in maritime environments (2002) Journal of the Atmospheric Sciences, 59, pp. 501-523; Tafuro, A.M., Barnaba, F., De Tomasi, F., Perrone, M.R., Gobbi, G.P., Saharan dust particle properties over the central Mediterranean (2006) Atmospheric Research, 81, pp. 67-93; Zerefos, C.S., Nastos, P.T., Balis, D., Papayannis, A., Kelepetsis, A., Kanellopoulou, E.A., Nikolakis, D.J., Varotsos, C., A complex study of Etna's volcanic plume from ground-based, in situ and space-borne observations (2006) International Journal of Remote Sensing, 27 (9), pp. 1855-1864