Analysis Of Spatial-Temporal Rainfall Variability And Its Relationship With Sea Surface Temperature Over Western Oromia.

Abstract

All Rural Livelihood Systems In Ethiopia Are Highly Sensitive To Climate. Rainfall Is The Primary Climatic Factor That Directly Affects Agriculture, Hydrological Dynamics And Driver Of Food Insecurity And That Shows Variations Across Time And Space. The Main Objective Of This Study Was To Analyses The Spatial-Temporal Variability Of Rainfall And Its Correlation With Ssts By Using Statistical Method For Period From 1985 To 2016 Over Western Oromia Of Southwestern Ethiopia. Mean Annual Rainfall Distribution Increases Toward The Central Portion Of The Area From The East And West Over Western Oromia. Inter-Annual Rainfall And Kiremt Season Variability Varies From Low To Moderate (Cv%=11 To 24%) And Unimodal Type. The Mk-Trend Test Show An Increasing Trend Change In Annual And Seasonal Rainfall And Onset Of Rainy Season Is Moderate, More Variable Than Cessation And Late One To Two Week From Previous Studies. This May Be A Signal Of Climate Change Impact On The Region. Belg Season Precipitation Anomalies With Ssts Correlation Showed Statically Significant Positive Relationship Over North Eastern Tropical Pacific (Ni??O Regions -1600w ??�� 1000w), South Western Part Of Atlantic And Indian Ocean. Parts Of Western Atlantic Ocean And North Western Pacific Ocean Also Show Negative Correlation Coefficients With Rainfall Anomaly During The Belg Season. Kiremt Season Anomalies To Ssts In The Region Show A Positive Relationship Over South Eastern Tropical Pacific, Central And South Western Part Of Atlantic Ocean. Western Parts Of Equatorial Atlantic Ocean And Central And North Western Pacific Ocean (Ni??O Regions-1600w ??��-1000w) Also Show Negative Correlation Coefficients With Kiremt Season Rainfall Anomalies Over Western Oromia.