期刊
AEOLIAN RESEARCH
卷 50, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.aeolia.2021.100677
关键词
PM10; Mineral dust; Saharan dust; Metallic elements; Back trajectories
资金
- DGRSDT
This study identified the contribution of Saharan dust inputs to daily PM10 concentrations in Constantine, Algeria, with findings showing that mineral dust contribution on SD days was significantly higher than on non-SD days. SD events occurred 42.2% of the annual days, leading to a significant increase in PM10 concentration and most metal elements concentrations.
Measurements of Saharan dust (SD) inputs are very scarce in the vicinity of the Saharan desert. This work aims to identify Saharan dust intrusions and evaluate their contribution to annual and daily PM10 at an urban background site located in the city of Constantine in Algeria. A reliable identification of SD days was carried out using aerosol maps provided by BSC-DREAM model and the information provided by HYSPLIT air mass back trajectories. SD is mainly composed of mineral dust (MD) due to the proximity of the Sahara to the study site. MD was determined by chemical speciation analysis and was estimated on SD days and non SD days. The contribution of MD on SD days was about 50% higher than that observed on non SD days. The observed average PM10 concentration during the study period was 56 ? 32.0 ?g/m3. During SD days, the average PM10 concentration was 70 ? 36.1 ?g/m3. On average, the PM10 concentration increased by 17.05 ? 12.7 ?g/m3 on SD days. SD events contributed between 0.6 and 41.5 ?g/m3 to the daily PM10 concentrations, whereas the average contribution to the annual PM10 concentration was 7.2 ? 11.8 ?g/m3 i.e., 12.8 ? 15.5%. After the extraction of the SD load, the annual WHO air quality guideline (AQG) was still exceeded. SD incursions led to an increase of most metal elements concentrations by a factor ranging from 1.05 to 3.33. Our results point out that SD outbreaks are quite frequent as they occurred 42.2% of the annual days.
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