EVALUATION OF THE EFFECTS OF MADDEN JULIAN OSCILLATION ON THE OCCURRENCE OF DRY AND WET SPELLS IN FARS PROVINCE, IRAN

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NAZEMOSADAT M.J.; GHAEDAMINI ASADABADI H.

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Journal: Journal of Water and Soil Science Year:2011 | Volume:15 | Issue:55 Page(s): 13-25

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Title

EVALUATION OF THE EFFECTS OF MADDEN JULIAN OSCILLATION ON THE OCCURRENCE OF DRY AND WET SPELLS IN FARS PROVINCE, IRAN

Author(s)

NAZEMOSADAT M.J. | GHAEDAMINI ASADABADI H. | Issue Writer Certificate

Keywords

MADDEN JULIAN OSCILLATION (MJO)Q2

PRECIPITATIONQ1

DRY SPELLSQ3

WET SPELLSQ2

IRANQ3

FARSQ3

Abstract

The Madden Julian oscillation (MJO) is known as the primary mode of large-scale inter-seasonal variability in tropical regions, affectimg equatorial and sub-tropical climates. This study investigated the effects of the MJO on the occurrence of wet and DRY SPELLS in FARS province, central southern part of IRAN, during November-April. Monthly PRECIPITATION data of nine stations spread over various parts of the province was analyzed during 1979-2005. Using two well-known MJO indices: MK and WH, the positive and negative phases of the MJO phases (enhanced and suppressed convective activity over the equatorial Indonesian region, respectively) were identified for monthly and seasonal scales. PRECIPITATION-MJO composites were then constructed for the opposite phases. It was shown that for all the considered stations, seasonal PRECIPITATION during negative MJO phase was significantly greater (from about 2.5 to 6.0 folds) than the corresponding values during the positive phase. Moreover, the applied statistical tests proved that the frequency of wet or dry events was related to the prevalence of negative or positive MJO phase, respectively. As the positive MJO phase was engulfed, the probability of dry events varied from 60% to 84%. On the other hand, the probability of wet events was found to vary from 60% to 76% during the MJO negative phase.

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APA: Copy

NAZEMOSADAT, M.J., & GHAEDAMINI ASADABADI, H.. (2011). EVALUATION OF THE EFFECTS OF MADDEN JULIAN OSCILLATION ON THE OCCURRENCE OF DRY AND WET SPELLS IN FARS PROVINCE, IRAN. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), 15(55), 13-25. SID. https://sid.ir/paper/14777/en

Vancouver: Copy

NAZEMOSADAT M.J., GHAEDAMINI ASADABADI H.. EVALUATION OF THE EFFECTS OF MADDEN JULIAN OSCILLATION ON THE OCCURRENCE OF DRY AND WET SPELLS IN FARS PROVINCE, IRAN. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES)[Internet]. 2011;15(55):13-25. Available from: https://sid.ir/paper/14777/en

IEEE: Copy

M.J. NAZEMOSADAT, and H. GHAEDAMINI ASADABADI, “EVALUATION OF THE EFFECTS OF MADDEN JULIAN OSCILLATION ON THE OCCURRENCE OF DRY AND WET SPELLS IN FARS PROVINCE, IRAN,” WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), vol. 15, no. 55, pp. 13–25, 2011, [Online]. Available: https://sid.ir/paper/14777/en

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