Title: An Estimating the role of upper Blue Nile basin moisture budget and recycling ratio in temporal and spatial precipitation distributions

Abstract:

Upper Blue Nile basin (UBNB) is the water tower of Ethiopia and downstream countries. It contributes significant moisture to the surrounding atmosphere. However, the contribution of the moisture from the basin to the precipitation in the study area is not well documented. Therefore, this paper is aimed to estimate the role of UBNB moisture budget and recycling ratio for temporal and spatial precipitation distributions. To this end, we used European Center for Medium-range Weather Forecast (ECMWF) data from 1979-2017. The derived ECMWF results are correlated with in-situ observations with the correlation coefficient of 0.82. During summer period most of the UBNB moisture is changed to precipitation around the central parts of the study area, while in spring it contributes to the southern parts of the study area. Whereas northwest part of the study area is affected by the basins moisture during autumn season. The calculated recycling ratios of the 4 seasons (summer, autumn, spring and winter) are 9.70%, 16.33%, 19.01%, and 35.30% respectively with the yearly average value of 20.11%. It is evident that, the maximum amount of precipitation is extracted from the local moisture during the winter season. Generally, UBNB moisture budget had lesser contribution of precipitation over the study area. It rather contributed a significant precipitation to the nearby countries such as Egypt and Sudan. Hence, further studies on moisture budget are required to explain this phenomenon in the context of Ethiopia.

Biography:

Mr.Megbar Wondie Birhan is 29 years old. He is the youngest researcher in the field of atmospheric physics by profession and works at Bahir Dar and Debre Markos University, Ethiopia. He holds my BSc degree in applied physics in the year of 2010 and hold MSc degree by radiation physics in 2011/12. he holds PhD in atmospheric physics in 2019. Within 6 years I have 7 international publications. He was presented different papers in 16 national and international conferences.