TY - JOUR AU - Sharma, Niranjan Prasad AU - Sapkota, Bal Krishna AU - Bhattarai, Binod AU - Kjeldstad, Berit PY - 2011/07/20 Y2 - 2024/03/29 TI - Study on Aerosol Optical Depth in Winter and Summer Season in Bhaktapur JF - Journal of the Institute of Engineering JA - J. Inst. Engineering VL - 8 IS - 1-2 SE - Articles DO - 10.3126/jie.v8i1-2.5122 UR - https://www.nepjol.info/index.php/JIE/article/view/5122 SP - 269-276 AB - <p>Aerosol optical depth in winter and summer season, 2009 was studied in Bhaktapur (Kausaltar). Spectral aerosol optical depth (AOD) measurements were estimated from a Microtops II Sun Photometer. The results indicated high values in summer and low values in winter. It also showed that AOD is larger in shorter wavelength and gradually decreases towards longer wavelength. The increasing value of AOD in summer season may be due to the accumulation of high speed dust particles. The lower values in winter months are due to the reduction of bigger particles. The spectral dependence of AOD on January 27 was found to be 0.64, 0.52, 0.48 and 0.35. The AOD at 340 nm in January and July were 0.63 and 0.62, respectively. The maximum and minimum value of AOD at 340 nm in the month of April and August were recorded as 1.62 and 0.56, respectively.</p><p><em><strong>Keywords:</strong></em> Sun photometer; Aerosol; Aerosol optical depth; Angstrom parameters; Irradiance</p><p>DOI: http://dx.doi.org/10.3126/jie.v8i1-2.5122</p><p><em><strong>Journal of the Institute of Engineering </strong></em></p><p>Vol. 8, No. 1&amp;2, 2010/2011</p><p>Page: 269-276</p><p><em><strong>Uploaded Date</strong></em>: 20 July, 2011</p> ER -