AAU-ETD AAU-ETD
 

Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
Faculty of Journalism and Communications >
Thesis - Journalism and Communication >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/207

Title: TROPICAL OCEANS THERMODYNAMIC AND ATMOSPHERIC MODULATIONS OVER SOUTHERN ETHIOPIAN CLIMATE, WATER RESOURCE AND VEGETATION VARIABILITY
Authors: MESFIN, TADEWOS
Advisors: ABEBE YESHANEW (PHD)
Copyright: 2007
Date Added: 9-Nov-2007
Publisher: Addis Ababa University
Abstract: Singular value decomposition, correlation and composite analyses were used to investigate the tropical oceans thermodynamic and atmospheric modulations over the southern Ethiopian climate, water resource and vegetation variability. Significant association is found between them using the 50 years ocean and climate dataset from 1951 to 2000 and vegetation data that range from 1981 to 2000.Both climate and vegetation dataset are obtained from international centers. River discharge flow and water level dataset are obtained from the Ethiopian Water Resource. The study reveals the strong association between Tropical oceans thermodynamic and atmospheric circulation and climate, hydrology and vegetation over Southern Ethiopia. The tropical oceans sea surface temperature anomalies contribute 50% to the short rain season (SON) of rainfall over Ethiopia but a very small contribution to the long rain season (MAM) of the rainfall variability over the area. These tropical oceans also have contributions for the vegetation variability to 51.6% during the SON and 44.8% during the MAM seasons and for the water level variability to a 53% and 58% during the short and long rainfall seasons of the southern Ethiopia, respectively. The Tropical oceans heat content contributions also revealed with its 85.6% during the September through December season but with a very small contribution during the March through May season. The wet minus dry composite patterns of sea surface temperature and atmospheric analyses explain during the regional and global atmospheric dynamics together with the Tropical oceans modulation cause the climate, hydrology and vegetation variability. The correlation explains that tropical Indian Ocean is strongly correlated with the short rains of Ethiopia having a 99% confidence level and r=0.640 correlation coefficient. A 90-99% confidence level association except the MAM season is demonstrated by the Atlantic ocean and also the tropical pacific ocean is seen correlated more strongly than the other tropical oceans, particularly the December through February SST anomaly has a strong association with the short rains over Ethiopia.
Description: A THESIS SUBMITTED TO THE GRADUATE STUDIES ADDIS ABABA UNIVERSITY IN PARTIAL FULFILLMENTOF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN PHYSICS DEPARTMENT
URI: http://hdl.handle.net/123456789/207
Appears in:Thesis - Physics

Files in This Item:

File Description SizeFormat
MESFIN TADEWOS.pdf4.49 MBAdobe PDFView/Open

Items in the AAUL Digital Library are protected by copyright, with all rights reserved, unless otherwise indicated.

 

  Last updated: May 2010. Copyright © Addis Ababa University Libraries - Feedback