کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5487475 1523586 2017 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Aerosol optical properties of Western Mediterranean basin from multi-year AERONET data
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
Aerosol optical properties of Western Mediterranean basin from multi-year AERONET data
چکیده انگلیسی
Aerosol optical properties including the total and coarse mode aerosol extinction optical depth (AODt and AODc respectively), Angstrom exponent (AE), size distribution, single scattering albedo (SSA) were examined using long-term ground-based radiometric measurements at 9 sites in the Western Mediterranean: Oujda, Malaga, Barcelona, Carpentras, Rome Tor Vergata, Ersa, Ispra, Venice and Evora, during the 4-year study period (2010-2013). The South-North gradient in the fraction of AODc represents the signature of the increasing influence of coarse particles on the optical properties at southern stations. This fraction has a daily mean ranging from 48 ± 18% at the southern site Oujda and to 8 ± 8% at Ispra. The low average AE444-870 value (<0.7) at Oujda confirms the major influence of large dust particles. Conversely, the AOD at urban stations are dominated by fine mode particles. The Angstrom Exponent (AE444-870) above 1.5 in Ispra and Venice indicates an atmospheric situation corresponding to the urban pollution controlled by small particles. We have analyzed the intrinsic dust optical properties by selecting the dusty days corresponding to a total optical depth above 0.3 and a fraction of the coarse mode optical depth above 30%. For these cases, the mean AODt during dusty days was shown to be close to 0.4. During dusty days, the coarse mode fraction represents 88% of the total volume at Oudja and above 83% for all other sites. There is a weak variability in the mean coarse mode volume median radius, showing an average of 1.98 ± 0.1. A maximum in the AODc was observed in the summer of 2012, with particular high events on June 27. The forward trajectory starting at Evora on June 27 clearly indicates that all the sites were affected by such dust events in the following days.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 164, November 2017, Pages 222-228
نویسندگان
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