Determination of Aerosol Characteristics and Direct Radiative Forcing at Pune

G. V. Pawar；P. C. S Devara；S. D. More；P. Pradeep Kumar；G. R. Aher

Aerosol optical depth ； Aerosol radiative effects ； SW solar flux

Aerosol and Air Quality Research

12卷6期（2012 / 12 / 01）

1166 - 1180

英文

Simultaneous measurements of aerosol optical depth and incoming global solar flux were carried out with a MICROTOPS-II Sunphotometer and Eppley Precision Spectral Pyranometer over Nowrosjee Wadia College (NWC, Pune) as the nodal centre, and at Pune University (PU) and IUCAA Girwali Observatory (IGO), in a field campaign mode during December 2010-May 2011. Data was analyzed to determine the surface short-wave (SW) aerosol direct radiative forcing (ADRF, ΔF per unit 0.1 AOD) and to study the characteristics of the aerosols. The results indicate that ADRF shows significant day-to-day variability and co-varies with AOD. The cause of the day-to-day variation in ADRF is an anticorrelation between ADRF/AOD, and differences in the daily maximum minus minimum RH and temperature. At NWC, ADRF ranges between -37.7 W/m^2 (highest) and -5.9 W/m^2 (lowest). For 500 nm, ADRF takes values in the range -17.3 ± 7.1 W/m^2 to -54.2 ± 5.5 W/m^2 at PU, whereas the corresponding values at IGO are -15.1 ± 2.1 W/m^2 and -36.6 ± 6.4 W/m^2. Monthly ADRF is at the minimum level in winter and maximum during the pre-monsoon period. The magnitude of AOD shows significant diurnal variability. In winter, the mean AOD diurnal percentage departure at 500 nm is positive in the morning and negative during the afternoon, and this is reversed in the pre-monsoon period. The diurnal cycle of AOD is related to the prevalent meteorological conditions, surface-based nocturnal temperature inversion in the atmospheric boundary layer (ABL), and influx of aerosols from different source regions.

1. 李冠樺(2017)。氣體反壓與動態模具溫控技術應用於熱塑性彈性體高減重比之超臨界微細發泡射出成型泡體均勻性之研究。中原大學機械工程學系學位論文。2017。1-191。 
2. 潘博澄(2017)。高透明性含芳香胺結構聚醯胺孔洞膜及混成材料之合成與電致變色特性之研究。臺灣大學高分子科學與工程學研究所學位論文。2017。1-123。 
3. 宗怡君(2013)。含少量添加物之硫酸鈣生醫陶瓷其燒結性質與生物降解行為的研究。國立臺灣大學材料科學與工程學系學位論文。2013。1-152。