Association between North Atlantic oscillation and precipitation in Iran with weekly time scale

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Seyyed Nezhad Golkhatmi Nafiseh; BAZRAFSHAN JAVAD; Nazi Ghameshlou Arezo; IRANNEJAD PARVIZ

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Journal: Journal of Range and Watershed Managment Year:2019 | Volume:72 | Issue:2 Page(s): 427-442

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Title

Association between North Atlantic oscillation and precipitation in Iran with weekly time scale

Author(s)

Seyyed Nezhad Golkhatmi Nafiseh | BAZRAFSHAN JAVAD | Nazi Ghameshlou Arezo | IRANNEJAD PARVIZ | Issue Writer Certificate

Keywords

NAOQ1

weekly moving average of precipitationQ1

ERA-InterimQ1

IranQ2

Abstract

North Atlantic Oscillation (NAO) is one of large-scale signal that affects the north hemisphere. Various studies have investigated the correlations between Iran’ s precipitations and North Atlantic Oscillation from monthly to yearly scales. This study has considered weekly time scale. The daily precipitation variable was obtained from the ERA-Interim database (grid) and its compliance with ground reference points (synoptic) were investigated (1979-2016). The results showed that the amount of annual precipitation in regions with more humidity, especially in the Caspian region, is underestimated. Also, the correlation between grid and synoptic precipitation data in the western, northeastern and southeastern area of the country is the highest and in the strip parallel to the western-eastern line (the middle areas) is the lowest (weekly average). This correlation decreases from winter to autumn and spring, respectively. A review of the time series of the sever events of NAO during the year with the weekly scale showed that this signal had two peaks, which was used to select the time period of assessing the relationship between precipitation in Iran and NAO. The results showed that the correlation between grid precipitation and NAO is not completely direct and relative frequency of direct correlation is more than non-direct type and decreases from north to south.

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APA: Copy

Seyyed Nezhad Golkhatmi, Nafiseh, BAZRAFSHAN, JAVAD, Nazi Ghameshlou, Arezo, & IRANNEJAD, PARVIZ. (2019). Association between North Atlantic oscillation and precipitation in Iran with weekly time scale. JOURNAL OF RANGE AND WATERSHED MANAGEMENT (IRANIAN JOURNAL OF NATURAL RESOURCES), 72(2 ), 427-442. SID. https://sid.ir/paper/375430/en

Vancouver: Copy

Seyyed Nezhad Golkhatmi Nafiseh, BAZRAFSHAN JAVAD, Nazi Ghameshlou Arezo, IRANNEJAD PARVIZ. Association between North Atlantic oscillation and precipitation in Iran with weekly time scale. JOURNAL OF RANGE AND WATERSHED MANAGEMENT (IRANIAN JOURNAL OF NATURAL RESOURCES)[Internet]. 2019;72(2 ):427-442. Available from: https://sid.ir/paper/375430/en

IEEE: Copy

Nafiseh Seyyed Nezhad Golkhatmi, JAVAD BAZRAFSHAN, Arezo Nazi Ghameshlou, and PARVIZ IRANNEJAD, “Association between North Atlantic oscillation and precipitation in Iran with weekly time scale,” JOURNAL OF RANGE AND WATERSHED MANAGEMENT (IRANIAN JOURNAL OF NATURAL RESOURCES), vol. 72, no. 2 , pp. 427–442, 2019, [Online]. Available: https://sid.ir/paper/375430/en

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