STUDYING CHANGES IN THE WIND AND TEMPERATURE FIELDS DUE TO URBANIZATION IN TEHRAN

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RANJBAR SAADATABADI A.; AZADI M.

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Journal: GEOGRAPHICAL RESEARCH Year:2005 | Volume:20 | Issue:1(76) Page(s): 171-188

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Title

STUDYING CHANGES IN THE WIND AND TEMPERATURE FIELDS DUE TO URBANIZATION IN TEHRAN

Author(s)

RANJBAR SAADATABADI A. | AZADI M. | Issue Writer Certificate

Keywords

TIME SERIESQ4

TRENDQ2

LAND USEQ2

URBANIZATIONQ2

TEMPERATURE FIELDQ2

WIND FIELDQ2

LAND USEQ2

TEHRANQ2

IRANQ2

Abstract

Due to rapid URBANIZATION and industrial developments in recent years there have been significant changes in meteorological fields and surface characteristics of large cities. The extents of these changes depend on many parameters such as the amount of released energy, population, geographical latitude and air ventilation. One well-known example of these is that the paved roads have changed the absorbed solar energy by the surface. In order to study the effects of URBANIZATION and land-use change in large cities on some important weather parameters the TRENDs of temperature and wind in the large city of TEHRAN has been compared with that of Varamin for the last forty years. Results showed an increasing TREND of minimum temperatures in TEHRAN compared to Varamin. The rate of change in the annual mean of minimum temperature in TEHRAN is four times larger than that of Varamin (0.065 versus 0.016°Cyr-I).Examining the changes of the monthly TRENDs of temperature showed that the rate of increase is not the same for all months and decades. Maximum increase of monthly mean of minimum temperature for TEHRAN and Varamin is 0.116 and 0.053°Cyr-Irespectively occurred in November and minimum increase of monthly mean of minimum temperature for these two cities is 0.03 and -0.008°Cyr-1 occurred in February. The difference between the annual mean of minimum and maximum temperature for the first and last ten years was calculated and it was seen that the minimum temperature in TEHRAN has significantly changed during the last ten years especially in the month of November. Fifty years TIME SERIES of temperature for the period of study (1951-2000) for TEHRAN also shows that the minimum temperature has a significant increase compared to the maximum temperature. In general the mean temperature of TEHRAN has increased but the rate of increase is not the same for the whole period of study. Moreover, the rate of increase in the temperature has accelerated in the second 25 years and is concurrent with URBANIZATION and industrial development in TEHRAN. This increase in the temperature and especially the minimum temperature in TEHRAN may have destructive effects on the environment and can cause local climate change.Aerosols and pollutants existing in the air are taken away from over the city and thus green-house effects are reduced and minimum temperature is not shifted to higher values i.e. the wind plays an important role in decreasing the temperature difference between the city and the surrounding areas. Most of the times, TEHRAN is affected by catabatic and anabatic winds that have an important role for taking the pollutant from over the city away. Thus any decrease in the local wind speeds can increase the pollution of the city. Studying the fifty years (1951-2000) records of winds over TEHRAN shows a weakening of the night time winds. Considering the topographical features of TEHRAN, ventilation is being done only from north and east of the city. When the northerly local winds are weakened the ventilation is also lesser and there is a favorable conditions for the aerosols and pollutants to become stagnant over the city which means an increase in the minimum temperature. Moreover, the relationship between URBANIZATION and weakening of the local night time winds over the city seems to be logical. Thus, further weakening of the local winds at night time, more increase in the minimum temperature and more polluted air are the results of further URBANIZATION.

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APA: Copy

RANJBAR SAADATABADI, A., & AZADI, M.. (2005). STUDYING CHANGES IN THE WIND AND TEMPERATURE FIELDS DUE TO URBANIZATION IN TEHRAN. GEOGRAPHICAL RESEARCH, 20(1(76)), 171-188. SID. https://sid.ir/paper/29912/en

Vancouver: Copy

RANJBAR SAADATABADI A., AZADI M.. STUDYING CHANGES IN THE WIND AND TEMPERATURE FIELDS DUE TO URBANIZATION IN TEHRAN. GEOGRAPHICAL RESEARCH[Internet]. 2005;20(1(76)):171-188. Available from: https://sid.ir/paper/29912/en

IEEE: Copy

A. RANJBAR SAADATABADI, and M. AZADI, “STUDYING CHANGES IN THE WIND AND TEMPERATURE FIELDS DUE TO URBANIZATION IN TEHRAN,” GEOGRAPHICAL RESEARCH, vol. 20, no. 1(76), pp. 171–188, 2005, [Online]. Available: https://sid.ir/paper/29912/en

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