2021/07/22 by Mulugeta Dadi Belete, Belete, Mulugeta Dadi
Arts and Humanities · Health Professions · #Aging, Elder Care, and Social Issues #Coherence analysis #Health, Medicine and Society #Hermeneutics and Narrative Identity #Principal components analysis #Ragim shift index #Sea surface temperature #lake level variability
paper · doi:10.20372/6dz2sd72
openalex publication_date 2021/07/22 · openalex created_date 2021/08/30 · openalex updated_date 2026/07/01
Large scale atmospheric circulations exist over wide areas that affect regional climate conditions in adjacent or remote regions. Important aspect of climate change and variability is how these teleconnections are related to and influence local hydroclimate. In this regard, the hydroclimatic condition of East-Africa has frequently shown to have teleconnection with Indian and Pacific Oceans with little focus on the influence of Atlantic Ocean. This study investigated the likely association of Atlantic Ocean with the hydro-climate of two selected lakes in Ethiopian Rift Valley Basin (Lake Hawassa and Lake Abaya). The study employed three statistical measure the frequency and strength of the association; and principal component analysis to identify patterns of variations. The homogeneity test revealed that the water level of Lake Hawassa and Abaya have experienced significant regime shifts at and around the period in which sea surface temperature (SST) of Atlantic Ocean significantly shifted. On the other hand, the coherence analysis confirmed that the local hydrology has significant coherence (p<0.01) with the corresponding sea surface anomalies of Atlantic Ocean. In addition, the principal component analysis traces out the role of Atlantic Ocean and Indian Ocean to significantly act in the same direction of influence. The findings provide strong bases to consider sea surface temperature of Atlantic Ocean as one of the potential predictor of local hydroclimate in East Africa in general and Ethiopia in particular.