Abstract
Climate change is one of the most important issues of today’s World. Climate scientists have concluded that the earth’s surface air temperature warmed by 0.6 ± 0.2℃ during the 20th century, accompanied by changes in the hydrologic cycle. Of all the climate elements, temperature plays a major role in detecting climate change brought about by urbanization and industrialization. This study focuses on the variability and trends of the mean annual, seasonal and monthly surface air temperature in Taiz city, Republic of Yemen, during the period 1979-2006. The results of the analysis of the whole period reveal a statistically significant increasing trend in practically all the months and seasons. A tendency has also been observed towards warmer years, with significantly warmer summer and spring periods and slightly warmer autumn and winter, an increase of 1.79℃ and 1.18℃ has been observed in the mean summer and mean winter temperature, respectively. Positive trends of about 1.5℃ in the annual mean temperature were found for the whole period. The air temperature time series are analyzed, so that the variability and trends can be described.
Highlights
This study focuses on the variability and trends of the mean annual, seasonal and monthly surface air temperature in Taiz city, Republic of Yemen, during the period 1979-2006
Climatic change is one of the most important issues of present times, World-wide interest in global warming and climate change has led to numerous trend detection studies
This study investigated monthly, seasonal and annual climatic variability in Taiz City based on mean maximum, mean minimum and mean air temperatures
Summary
Climatic change is one of the most important issues of present times, World-wide interest in global warming and climate change has led to numerous trend detection studies. Anthropogenic interference in the environment is one of the greatest causes of the process of climatic change in several regions of the world. This complex phenomenon, which includes natural and human processes, depends on a multiplicity of factors and is an almost irreversible scenario [1]. The concentration of CO2, one of the major greenhouse gases, in the atmosphere has increased significantly. They trap solar energy, warming the atmosphere and the surface of the Earth, and play a critical role in maintaining the temperature of the Earth within a range suitable for life. As the levels of these gases build up in the atmosphere, they act like the transparent roof of a greenhouse, which allows in sunlight while trapping the heat energy
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