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Rainfall over Oman and its teleconnection with El Niño Southern Oscillation

Varikoden, H and Al-shukaili, HSA and Babu, CA and Samah, AA (2016) Rainfall over Oman and its teleconnection with El Niño Southern Oscillation. Arabian Journal of Geosciences, 9:520. pp. 1-8.

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Abstract

The Sultanate of Oman is located in the south-eastern part of the Arabian Peninsula and covers the larger part of the southern coasts of the Arabian Peninsula in both arid and semi-arid environments except for the southern part which is swept by the monsoon affecting the Arabian Sea during the period from June to September. The summer rainfall over Oman shows year-to-year variability, and this is caused by oceanic and atmospheric influences. In the present study, we tried to explore the influence of El Niño on the rainfall over Oman using different data sets. The empirical orthogonal function (EOF) technique employed to the zonal wind at 850 hPa for the 30-year period shows that the second and third modes of EOF are showing high variability over the Oman regions. The corresponding PCs were subjected to FFT analysis, and it showed a peak about 5–6 years. In addition to this, the zonal wind over the Oman regions is correlated with the global zonal wind and found a significant correlation (1 % significant level). It has already been proved that the wind and rainfall during summer monsoon is in phase. Moreover, the spectral analysis of rainfall at Masirah station and the Niño3.4 index show the similar mode of variability indicating a direct relationship. The correlation between rainfall and the Niño3.4 index is also showing a positive significant value, and therefore, it can be concluded that the El Niño in the Pacific favours rainfall over the Oman region.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer International Publishing
Uncontrolled Keywords: EL Nino; Rainfall; Teleconnection; EOF analysis
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 09 Feb 2017 05:34
Last Modified: 09 Feb 2017 05:34
URI: http://moeseprints.incois.gov.in/id/eprint/4408

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