Investigating the flux of radiation in Yazd city for the period of January 2006 –January 2008
Subject Areas :
Mostafa
Krampoor
1
(Ph.D., Assistant Professor, Lorestan University, Iran)
Hussain
Mohammadi
2
(Ph.D., Professor, Tehran University)
Faramarz
Khoshakhlagh
3
(Ph.D., Assistant Professor, Tehran University)
Houshang
Ghaemi
4
(lecturer, Iran Meteorological Organization)
Keywords: Albedo, net radiation flux, net radiation budget, Cfsr,
Abstract :
CFSR data with a spatial resolution of one tenth and hours of time (01 and 07 GMT) was extracted from 2006 to 2008 for the month of January, and Albedo monthly and hourly average, the net flux of radiation in terms were analyzed. The results were obtained as follows: Albedo ratio in the West of Yazd city is more than the east due to city texture and Architecture of Yazd city. The amount of Aledo in the city area is reduced roughly to 2 percent because of the precipitation. Average outgoing long wave flux at night in the northern area is more than the south area. The difference is 4 watts per square meter. This difference is due to the heat generated by the anthropogenic phenomenon. Because of the atmospheric turbidity in the northern area incoming short wave radiation is lower than that south area in cloudy and clear conditions. So, in the cloudy weather conditions, it received only 15 percent of the energy input in the clear condition. The amount of sensible heat flux is not high in the city this month. In the early hours of the night in the northern part of the city a sensible heat flux remains negative due to the production of anthropogenic heat. Sometimes the difference between north and south of the city is eight watts per square meter. Like other components of the radiation budget of the terrestrial heat flux distribution is not uniform and the amount in the south is more than that north. During the day the distribution is different in the north and south of about 21 watts per square meter. Latent heat flux between the north and south of the city is observed, while sometimes the opposite is taking place.
