Physical and chemical characteristics of aerosols over the Negev Desert (Israel) during summer 1996

Sde Boker, in the Negev Desert of Israel (30°51′N, 34°47′E; 470 m above sea level (asl), is a long-term station to investigate anthropogenic and natural aerosols in the eastern Mediterranean in the framework of the Aerosol, Radiation and Chemistry Experiment (ARACHNE). Ground-level measurements of physical and chemical properties of aerosols and supporting trace gases were performed during an intensive campaign in summer 1996 (ARACHNE-96). Fine non sea salt (nss)-SO42− averaged 8±3 μg m−3 and fine black carbon averaged 1.4±0.5 μg m−3, comparable to values observed off the east coast of the United States. Optical parameters relevant for radiative forcing calculations were determined. The backscatter ratio for ARACHNE-96 was β = 0.13±0.01. The mass absorption efficiency for fine black carbon (αa,BCEf) was estimated as 8.9±1.3 m2 g−1 at 550 nm, while the mass scattering efficiency for fine nss-SO42− (αs,nss-SO42−f) was 7.4±2.0 m2 g−1. The average dry single-scattering albedo, ω0 characterizing polluted conditions was 0.89, whereas during “clean” periods ω0 was 0.94. The direct radiative effect of the pollution aerosols is estimated to be cooling. At low altitudes (below 800 hPa), the area was generally impacted by polluted air masses traveling over the Balkan region, Greece, and Turkey. Additional pollution was often added to these air masses along the Israeli Mediterranean coast, where population and industrial centers are concentrated. At higher altitudes (700 and 500 hPa), air masses came either from eastern Europe or from North Africa (Algerian or Egyptian deserts). The combination of measurements of SO2, CO, CN (condensation nuclei), and accumulation mode particles allowed to characterize the air masses impacting the site in terms of a mixture of local and long-range transported pollution. In particular, the lack of correlation between SO2 and nss-SO42− indicates that the conversion of regional SO2 into the particulate phase is not an efficient process in summer and that aged pollution dominates the accumulation mode particle concentrations.

[1]  F. Lucarelli,et al.  Elemental Composition of Urban Aerosol Collected in Florence, Italy , 2000 .

[2]  F. Lucarelli,et al.  Source apportionment near a steel plant in Genoa (Italy) by continuous aerosol sampling and PIXE analysis , 2000 .

[3]  P. Formenti,et al.  Interrelationships between aerosol characteristics and light scattering during late winter in an Eastern Mediterranean arid environment , 1999 .

[4]  C. Liousse,et al.  Construction of a 1° × 1° fossil fuel emission data set for carbonaceous aerosol and implementation and radiative impact in the ECHAM4 model , 1999 .

[5]  J. Cafmeyer,et al.  Detailed mass size distributions of atmospheric aerosol species in the Negev desert, Israel, during ARACHNE-96. , 1999 .

[6]  Yoram J. Kaufman,et al.  Interannual variation of ambient aerosol characteristics on the east coast of the United States , 1999 .

[7]  Philip B. Russell,et al.  Aerosol properties and radiative effects in the United States East Coast haze plume: An overview of the Tropospheric Aerosol Radiative Forcing Observational Experiment (TARFOX) , 1999 .

[8]  R. Charlson,et al.  Direct climate forcing by anthropogenic aerosols : Quantifying the link between atmospheric sulfate and radiation , 1999 .

[9]  A. Smirnov,et al.  AERONET-a federated instrument network and data archive for aerosol Characterization , 1998 .

[10]  I. Olmez,et al.  Atmospheric trace element concentrations over the eastern Mediterranean Sea: Factors affecting temporal variability , 1998 .

[11]  A. Nenes,et al.  Modeling of aerosol properties related to direct climate forcing , 1998 .

[12]  Zev Levin,et al.  Composition of individual aerosol particles above the Israelian Mediterranean coast during the summer time , 1998 .

[13]  Y. Kaufman,et al.  Measurements of the relationship between submicron aerosol number and volume concentration , 1998 .

[14]  P. Hobbs,et al.  Airborne measurements of carbonaceous aerosols on the East Coast of the United States , 1997 .

[15]  Philip B. Russell,et al.  Chemical apportionment of aerosol column optical depth off the mid‐Atlantic coast of the United States , 1997 .

[16]  M. Wendisch,et al.  Measurements and modelling of aerosol single-scattering albedo : Progress, problems and prospects , 1997 .

[17]  D. Balis,et al.  Ground-based measurements of Saharan dust optical properties in the frame of the European MEDUSE Project , 1997 .

[18]  W. Maenhaut,et al.  Nuclear microprobe analysis of atmospheric aerosol samples: Comparison with bulk measurements and analyses of individual particles. , 1997 .

[19]  P. Bousquet,et al.  Tropospheric aerosol ionic composition in the Eastern Mediterranean region , 1997 .

[20]  A. Karnieli,et al.  Aerosol optical depths in a semiarid region , 1997 .

[21]  G. Stanhill,et al.  Long‐term trends in, and the spatial variation of, global irradiance in Israel‡ , 1997 .

[22]  Nadine D. Spitz,et al.  Atmospheric sulfur over the east Mediterranean region , 1996 .

[23]  Harold J. Annegarn,et al.  Regional atmospheric aerosol composition and sources in the eastern Transvaal, South Africa, and impact of biomass burning , 1996 .

[24]  S. Gassó,et al.  Aerosol measurements in the Arctic relevant to direct and indirect radiative forcing , 1996 .

[25]  Robert J. Charlson,et al.  Performance Characteristics of a High-Sensitivity, Three-Wavelength, Total Scatter/Backscatter Nephelometer , 1996 .

[26]  Jost Heintzenberg,et al.  Design and Applications of the Integrating Nephelometer: A Review , 1996 .

[27]  Z. Levin,et al.  The Effects of Desert Particles Coated with Sulfate on Rain Formation in the Eastern Mediterranean , 1996 .

[28]  J. Penner,et al.  A global three‐dimensional model study of carbonaceous aerosols , 1996 .

[29]  D. Eatough,et al.  Fine particulate chemical composition and light extinction at Canyonlands National Park using organic particulate material concentrations obtained with a multisystem, multichannel diffusion denuder sampler , 1996 .

[30]  W. Malm,et al.  Examining the relationship among atmospheric aerosols and light scattering and extinction in the Grand Canyon area , 1996 .

[31]  P. Hobbs,et al.  Measurements of aerosol optical properties in marine air , 1996 .

[32]  R. Hillamo,et al.  A new cascade impactor for aerosol sampling with subsequent PIXE analysis , 1996 .

[33]  Olivier Boucher,et al.  General circulation model assessment of the sensitivity of direct climate forcing by anthropogenic sulfate aerosols to aerosol size and chemistry , 1995 .

[34]  B. A. Bodhaine,et al.  Aerosol absorption measurements at Barrow, Mauna Loa and the south pole , 1995 .

[35]  S. F. Marshall,et al.  Comparison of measured and calculated aerosol properties relevant to the direct radiative forcing of tropospheric sulfate aerosol on climate , 1995 .

[36]  Arnon Karnieli,et al.  Characteristic spectral reflectance of a semi-arid environment , 1995 .

[37]  J C Chow,et al.  Measurement methods to determine compliance with ambient air quality standards for suspended particles. , 1995, Journal of the Air & Waste Management Association.

[38]  Judith C. Chow,et al.  Sensitivity of estimated light extinction coefficients to model assumptions and measurement errors , 1995 .

[39]  E. Ganor.  The frequency of Saharan dust episodes over Tel Aviv, Israel , 1994 .

[40]  Yoram J. Kaufman,et al.  Size distribution and scattering phase function of aerosol particles retrieved from sky brightness measurements , 1994 .

[41]  J. Kiehl,et al.  The Relative Roles of Sulfate Aerosols and Greenhouse Gases in Climate Forcing , 1993, Science.

[42]  Y. Kaufman.  Aerosol optical thickness and atmospheric path radiance , 1993 .

[43]  H. Horvath.  Atmospheric light absorption : a review , 1993 .

[44]  E. Ganor,et al.  The chemical and mineralogical composition of some urban atmospheric aerosols in Israel , 1992 .

[45]  J. Coakley,et al.  Climate Forcing by Anthropogenic Aerosols , 1992, Science.

[46]  Robert J. Charlson,et al.  Perturbation of the northern hemisphere radiative balance by backscattering from anthropogenic sulfate aerosols , 1991 .

[47]  S. Twomey,et al.  Aerosols, clouds and radiation , 1991 .

[48]  W. White.  The components of atmospheric light extinction: A survey of ground-level budgets , 1990 .

[49]  D. Goossens,et al.  Airborne dust in the Northern Negev Desert (January-December 1987): general occurrence and dust concentration measurements , 1990 .

[50]  G. d’Almeida,et al.  On the variability of desert aerosol radiative characteristics , 1987 .

[51]  M. Andreae,et al.  Long-range transport of soot carbon in the marine atmosphere , 1984 .

[52]  W. Maenhaut,et al.  Accurate calibration of a Si(Li) detector for PIXE analysis , 1984 .

[53]  Yoram J. Kaufman,et al.  Light Extinction by Aerosols during Summer Air Pollution , 1983 .

[54]  M. Andreae.  Soot Carbon and Excess Fine Potassium: Long-Range Transport of Combustion-Derived Aerosols , 1983, Science.

[55]  E. Ganor,et al.  Transport of Saharan dust across the eastern Mediterranean , 1982 .

[56]  W. Maenhaut,et al.  Determination of the chemical composition of the South Pole aerosol by instrumental neutron activation analysis , 1977 .

[57]  J. Hansen,et al.  Light scattering in planetary atmospheres , 1974 .

[58]  Benjamin Y. H. Liu,et al.  Characteristics of laminar jet impactors , 1974 .

[59]  R. Chester,et al.  Introduction to marine chemistry , 1971 .