Determination of atmospheric turbidity in Bangladesh

Atmospheric turbidity parameters have been determined following Angstrom's method at three locations in Bangladesh namely, Dhaka city (23.7 degrees N) and two rural locations, Haripur (26.03 degrees N) and Sripur (24.11 degre es N). The parameters were obtained from direct solar radiation data for sp ecific spectral regions and for the whole spectrum as measured using a norm al incidence pyrheliometer provided with cut-off glass filters. A considera ble variation of Angstrom's turbidity parameters for Dhaka over the year wa s observed with a maximum value in March. The value for Sripur for the mont h of March was somewhat lower and the value for Haripur for the month of Ap ril was not much different from that of Dhaka. Linke turbidity factor T-L w as also determined using the new value of solar constant 1367 W/m(2) for al l three locations. (C) 2000 Elsevier Science Ltd. All rights reserved.