Abstract
This paper, therefore, attempts to study temporal variation in temperature over Junagadh (Saurashtra Region) of Gujarat, India, India, during the period 1980-2011. The long-term change in temperature has been evaluated by Mann–Kendall rank statistics and linear trend. An important aspect of the present study is the significant cooling trend in mean annual temperature, which is more predominant during winter season. The summer season also shows significant cooling trend due to slightly decrease in Tmax. This cooling trend in Junagadh (Saurashtra Region) Gujarat, India temperature is supported by studies conducted by other researchers (Rupa Kumar and Hingane, 1988). These authors studied the temperature for Junagadh (Saurashtra region) Gujarat, India during the period 1980-2007 and observed a cooling trend, but not significant at any level. Against this background, in the present study, temperature data during the period 1980-2011 have been studied. The result indicates significant slightly decrease in winter temperature at 0.01 level. This suggests that the last decade has witnessed a phenomenal epoch in temperature series, leading to a decreasing trend from non-significant to significant. Contrary to this, the monsoon season shows warming trend. This may be due to significant increase in the low cloud amount during this season. We are still a long way from understanding the complex interaction of many physical processes that determine the evolution of climate.
Highlights
This problem worries the scientific community, as it could have a major impact on natural and social systems at local, regional and national scales
Numerous climatologists[1 2]; Intergovernmental Panel on Climate Change (IPCC),[3,4,5] agree that there has been a large-scale warming of the Earth’s surface over the last hundred years or so. This warming up of the Earth during the 20th century brought with it a decrease in the area of the world affected by exceptionally cool temperatures, and, to a lesser extent, an increase in the area affected by exceptionally warm temperatures[1]
An important aspect of the present study is the significant cooling trend in mean annual temperature, which is more predominant during winter season
Summary
This problem worries the scientific community, as it could have a major impact on natural and social systems at local, regional and national scales. Numerous climatologists[1 2]; Intergovernmental Panel on Climate Change (IPCC),[3,4,5] agree that there has been a large-scale warming of the Earth’s surface over the last hundred years or so This warming up of the Earth during the 20th century brought with it a decrease in the area of the world affected by exceptionally cool temperatures, and, to a lesser extent, an increase in the area affected by exceptionally warm temperatures[1]. The mean annual temperature shows a significant long-term slightly decreasing trend It can be seen from the figure that there had been a relatively warm period during 2000-2004. This is due to the increase in Tmin being significant at
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