Local and regional contributions to the atmospheric aerosol over Tel Aviv, Israel: a case study using elemental, ionic and organic tracers

被引:47
作者
Graham, B
Falkovich, AH
Rudich, Y
Maenhaut, W
Guyon, P
Andreae, MO
机构
[1] Max Planck Inst Chem, Dept Biogeochem, D-55128 Mainz, Germany
[2] Weizmann Inst Sci, Dept Environm Sci, IL-76100 Rehovot, Israel
[3] Univ Ghent, Inst Nucl Sci, B-9000 Ghent, Belgium
关键词
aerosol; pollution; dust; biomass burning; sulphate;
D O I
10.1016/j.atmosenv.2003.12.015
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Changes in aerosol composition associated with a cold front passage were examined during a field experiment in Tel Aviv, Israel (2-15 Dec, 2000). In addition to monitoring aerosol scattering and optical thickness, aerosol samples were collected for detailed chemical analyses. Data were compared to simultaneous measurements made at Sde Boker, a semi-remote site in the Negev Desert, to help determine what changes were due to local pollution as opposed to regional phenomena. During the pre-frontal period (2-7 Dec) both sites were influenced by air masses containing a relatively high content of sulphate and dust, originating from neighbouring regions of the Middle East. A steady build-up of local pollution was then observed in Tel Aviv due to vehicular emissions/industrial activities, as indicated by increasing concentrations of black carbon, organic carbon, V, Cu, Ni, Zn, Br, Pb, NO3- and PAHs. Identification of a number of organic biomass burning tracers (e.g., levoglucosan) indicates that smoke also contributed to the pollution build-up in Tel Aviv, while a range of sugars/sugar alcohols point to a microbial/bioaerosol component. Locally emitted pollutants tended to exhibit higher nighttime concentrations due to trapping of pollution under a nocturnal inversion. Fine aerosol iodine was the only element exhibiting higher daytime concentrations, hinting at a photochemical source. Post-frontal measurements (12-15 Dec) revealed a significant decrease in all pollutants due to dispersal of the haze by the cold front 66 (8-9 Dec), with the air initially being dominated by marine aerosol. Concentrations of pollutants then began to increase, with backward trajectories indicating a possible contribution from Eastern Europe. Overall, the study identified a range of useful tracers for monitoring the contribution of different sources to the aerosol over Israel. Crown Copyright (C) 2003 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:1593 / 1604
页数:12
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