Title: Analysis of the air temperature records of Djelfa's meteorological station from 1975 to 2014 'the reality of Djelfa's climate warming'

Authors: Guesmi Boubakeur; Sahnoune Mohamed; Chakali Gahdab

Addresses: Nature and Life Sciences Faculty, University of Djelfa, Naas City 470/14 Djelfa, Algeria ' Nature and Life Sciences Faculty, University of Tiaret, Algeria ' Zoology Department, Superior National School of Agronomy, Algiers, Algeria

Abstract: The delay of defoliation, the advance of blooming, in January, of some recently planted palm trees, the appearance of the housefly in winter, and the disappearance of the featuring cold and frost of Djelfa both prompted the need of a scientific explanation, based on the analyses of mean, minimum and maximum air temperatures records for a period of 40 years by the methods [coefficient of variation (CV), trend test, correlation and homogeneity test], which have shown that, although, the fluctuations of the mean temperature, especially in winter (CV = 27%), a global warming of 1°C was recorded, more due to Tmin (1.4°C) than to Tmax (0.92°C). Summer was the most warming season, then autumn and finally spring. However, a slight cooling was in December and February, intermediated by January's warming which would cause early break of the overwintering and the subsequent damages. Also, an almost recent abrupt change (of about 1°C to 3°C) was recorded except for winter, whose frost and cold disappearance would be partially caused by drought.

Keywords: semi arid; Djelfa; global warming; climate change; air temperature; Mann Kendall test; Algeria; steppe; frost; cold; homogeneity test; correlation; coefficient of variation; CV; thermal stress; phenological behaviour.

DOI: 10.1504/IJGW.2017.084015

International Journal of Global Warming, 2017 Vol.12 No.1, pp.66 - 84

Received: 13 Jan 2015
Accepted: 26 May 2015
Published online: 03 May 2017 *

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