Dr. Raymond W. Arritt– Mentor Department of Agronomy, Iowa State University

Dr. Alex Gonzalez – Mentor Department of Geological and Atmospheric Sciences, Iowa State University


The interannual variations of Salalah’s rainfall during monsoon and Somali low level Jet (SLLJ) in the Arabian Sea during 2002-2017 were examined using the the Oceanic Niño Index (ONI) and Dipole Mode Index (DMI). The rainfall data from the Public Authority of Civil Aviation (PACA) showed that the beginning of monsoon rainfall starts in June and continues to September. The rainfall amount reaches its maximum in July and August without a notable interannual trend. The maximum strength of the SLLJ obtained by the wind profile from ERAInterim reanalysis data. In June, July, August, and September (JJAS), the SLLJ core of maximum wind in each level formed in a similar longitude and latitude and the level of the absolute maximum wind speed fluctuated from 900 hPa and 950 hPa. When the April, May, and June’s (AMJ) average SST in El Niño condition, the maximum strength of the SLLJ is 0.5 m/s weaker than average and 0.6 m/s higher in La Niña conditions. When AMJ and MJJ have positive Indian Ocean Dipole (IOD), Salalah’s seasonal rainfall is less than the climate average. A higher rainfall average occurs when the SLLJ is stronger than average and a lower rainfall average happens when there is a weaker jet.

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Afada AlHubaishi

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