Analysis of trends in annual and seasonal precipitation changes in the extended Libyan coastal area From Benghazi in the east to Zuwara in the west for the period 1970-2010

Abstract

This research aims to analyze trends of recent changes in the annual and seasonal rainfall amounts (winter season) in the Libyan coastal area extending from Benghazi in the east to Zuwara in the west for the period 1970-2010 by analyzing the monthly data of the amounts of rain in a number of climatic stations spread on the Libyan coast, namely: (Benghazi, Ajdabiya, Sirte, Misurata, Tripoli, Zuwara) using statistical analysis methods, such as T-Test, Simple Linear Regression, Cumulated Sums, To monitor the trends of change and the amount of decrease or increase in the amounts of rain in the study area, and the results of the regression analysis confirmed the existence of negative values of change (b) indicating a decrease in the annual average of the amounts of rain in all climatic stations in the study area at a level of statistical significance less than 0.05 except for the two stations of Ajdabiya And Misurata, which witnessed positive values of change indicating an increase in annual rates of rain without statistical significance. With differences in the seasonal average of the amounts of rain between the two study periods in the winter season in favor of the second period (1986 2010) in the two stations of Tripoli Airport and Zuwara, as they recorded differences from the seasonal average. It was 42.965 mm and 33.205 mm, respectively, with a statistical significance of less than 0.05.