TREND ANALYSIS OF EXTREME PRECIPITATION INDICES OVER IRAN

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ASGARI AHMAD; RAHIMZADEH FATEMEH; MOHAMMADIAN NOUSHIN; FATAHI EBRAHIM

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Paper Information

Journal: Iran-Water Resources Research (IWRR) Year:2008 | Volume:3 | Issue:3 (9) Page(s): 42-55

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Title

TREND ANALYSIS OF EXTREME PRECIPITATION INDICES OVER IRAN

Author(s)

ASGARI AHMAD | RAHIMZADEH FATEMEH | MOHAMMADIAN NOUSHIN | FATAHI EBRAHIM | Issue Writer Certificate

Keywords

EXTREME PRECIPITATION INDICESQ4

INTENSITY OF PRECIPITATIONQ4

IRANQ2

TRENDQ2

Abstract

Study of extreme precipitations and related extreme events is of great importance in policy making and planning in variety of sectors including agriculture, water management, urbanization and building, and road and transportation.Hence, much attention has been paid to different methods of analysis of extreme precipitations during recent years.To study extreme precipitations over IRAN, we used EXTREME PRECIPITATION INDICES like Maximum I-day precipitation ( Rc1 day), Maximum consecutive 5-day precipitation (Rc5 day), Simple precipitation intensity index (SDII), Number of days with precipitation equal to or greater than 10, 20, and 25 mm (R10mm, R20mm, and R25mm), Maximum number of consecutive dry and wet days (CDD and CWD), Total precipitation when daily amounts are greater than 95th and 99th percentile of wet days( R95 P and R99 p), and Total precipitation in wet days (PRCPTOT).Our used data were limited to daily precipitation data from only 27 of IRANian synoptic stations that have reliable data and covering standard normal period 1961-1990.We found all three behaviors of stationary, positive and negative TRENDs over the country. As TRENDs for majority of the indices were positive in regions like Hormozgan, Esfahan, and Tehran, but on the contrary, they were negative for majority of the indices in regions like Azerbaijan and Fars.Former results correspond well with findings of Intergovernmental Panel on Climate Change (IPCC) that expects higher number of occurrences of extreme precipitation events beyond of tropical region. Positive TRENDs for 10 indices in Babolsar and negative TRENDs for 10 indices in Bushehr and Tabriz (7 out of 10 are significant at 0.05 level) indicate complex behaviors of extreme precipitation; over the country Occurrence of very abnormal values like total precipitation of 1 mm in Bandar abbas in 1962 have significantly affected slopes of TRENDs in most of the EXTREME PRECIPITATION INDICES.

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A LOOK AT THE DIFFERENCE BETWEEN INCREASE RATES OF MINIMUM AND MAXIMUM TEMPERATURE AND THE DECREASE RATES OF DIURNAL TEMPERATURE RANGE (DTR) IN IRAN

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APA: Copy

ASGARI, AHMAD, RAHIMZADEH, FATEMEH, MOHAMMADIAN, NOUSHIN, & FATAHI, EBRAHIM. (2008). TREND ANALYSIS OF EXTREME PRECIPITATION INDICES OVER IRAN. IRAN-WATER RESOURCES RESEARCH, 3(3 (9)), 42-55. SID. https://sid.ir/paper/99969/en

Vancouver: Copy

ASGARI AHMAD, RAHIMZADEH FATEMEH, MOHAMMADIAN NOUSHIN, FATAHI EBRAHIM. TREND ANALYSIS OF EXTREME PRECIPITATION INDICES OVER IRAN. IRAN-WATER RESOURCES RESEARCH[Internet]. 2008;3(3 (9)):42-55. Available from: https://sid.ir/paper/99969/en

IEEE: Copy

AHMAD ASGARI, FATEMEH RAHIMZADEH, NOUSHIN MOHAMMADIAN, and EBRAHIM FATAHI, “TREND ANALYSIS OF EXTREME PRECIPITATION INDICES OVER IRAN,” IRAN-WATER RESOURCES RESEARCH, vol. 3, no. 3 (9), pp. 42–55, 2008, [Online]. Available: https://sid.ir/paper/99969/en

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