頁籤選單縮合
題 名 | Multi-Year Analysis of Aerosol Properties Retrieved from the Ångström Parameters for Different Spectral Ranges over Pune |
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作 者 | Kolhe, Amol R.; Pawar, Ganesh V.; Varpe, Sandeep R.; Kumar, Pallath Pradeep; Devara, Panuganti C. S.; Aher, Gajanan R.; | 書刊名 | Aerosol and Air Quality Research |
卷 期 | 16:12 2016.12[民105.12] |
頁 次 | 頁3266-3280 |
分類號 | 445.63 |
關鍵詞 | Aerosol optical depth; Ångström exponent; Ångström turbidity coefficient; Aerosol loading; Aerosol sources; |
語 文 | 英文(English) |
英文摘要 | The present study evaluates the temporal variation of aerosol optical depth (AOD500 nm) and the Ångström parameters [viz., Ångström exponent (AE, α), Ångström turbidity coefficient (β) and second order Ångström exponent (α′)] at a tropical observing site, Pune (18°32′N; 73°49′E, 559 m AMSL) during 2008–15. Six-year means for winter and premonsoon seasons together are found to be 0.534 ± 0.13, 1.054 ± 0.27, 0.254 ± 0.08 and 0.167 ± 1.33 for AOD500 nm, AE, β and α′ respectively. Average month-to-month variability of AOD500 nm, AE, β and α′ during 2008–15 depicts seasonal cycle with strong departures with respect to long-term means. Frequency distributions for AOD, AE and β are positively skewed (skewness = 0.77, 0.32 and 1.14 respectively) while it is negatively skewed for α′ (skewness = –0.18). Analysis of AE difference, curvature parameter difference (α2–α1) and AOD500 nm–AE440-870 nm contour density map reveals that the aerosol ensemble at Pune consists of four aerosol types viz., UI (urban/industrial), CM (clear maritime), DD (desert dust) and MT (mixed type). Their relative magnitudes, however, differ during winter and pre-monsoon seasons. Thus, the contour density map shows dominance of UI and relatively less occurrence of MT type aerosols during winter. In pre-monsoon, however, the aerosol scenario is driven by MT type aerosol although UI and DD type aerosols show their remarkable existence. |
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