Effect of air masses on relative humidity And its importance in Yemen

Abstract

The study of air masses and their variations, from one place to another, is of great importance, because they are the main cause of climatic changes, and there is no doubt that the changes of air masses according to time, place and their position, cause the emergence of different weather manifestations, especially relative humidity, cloud formation and precipitation, and without studying Air masses The role of relative humidity in weather and climate is difficult to understand.

The research aims to determine the air masses and their types and the extent of their impact on relative humidity, find the relationship between air masses and their reflections on relative humidity, surface pressure systems, and analyze the surface weather conditions (conditions) accompanying the occurrence of air masses, by studying different weather variables and weather maps for a proposed study period. From 2010-2014 AD and analyzed.

The researcher reached a number of results, the most important of which are:

That there is an effect of air masses in summer and winter, as the Siberian and European masses affect the relative humidity in the winter and strongly, especially in the northern and northeastern parts of the country, and the tropical marine masses affect the coastal regions and parts of the country and increase the rate of relative humidity, especially in the summer For the passage of tropical marine masses on water bodies, namely the Red Sea, the Gulf of Aden, the Arabian Sea and the Indian Ocean, and sometimes the monsoon winds from the south and southeast in the summer. The research also concluded that the eastern, northeastern and interior regions are the least humid regions for the arrival of dry air masses from Central Asia (tropical) or their arrival from the west when they have become dry.