Abstract
One of the most important scientific concerns of the last few decades is climate change, which is the result of a great many factors like global warming. Although a number of studies have been dedicated to understand the phenomenon of climate change, more attention is required to understand the potential effects of global warming on the ecosystems as well as on human life. The present study was designed to survey the trends of minimum, maximum and mean temperatures, relative humidity, and the time series of annual precipitation and 10-year moving average low-pass filter in the 13 synoptic weather stations of Iran’s arid and semi-arid regions during the last 55 years by using τ Kendall test. The analyses indicate a significantly increasing trend for the minimum and mean temperatures while a decreasing trend for the mean relative humidity in the arid and semi-arid regions, especially during the last few years up to the year 2000. Any clear increasing or decreasing trend was not found for the maximum temperature, while the precipitation did not show any increasing/decreasing trend for most of the surveyed stations. Further studies, with long-term programming, are recommended to be carried out to evaluate the climate change and its effects on such regions.
Abstract
واحدة من أهم اهتمامات العلمية خلال العقود القليلة الماضية هو تغير المناخ ، والذي هو نتيجة لعوامل كثيرة عظيمة مثل الاحترار العالمي. على الرغم من أن عددا من الدراسات قد كرس لفهم ظاهرة تغير المناخ ، ولكن المطلوب هو المزيد من الاهتمام لفهم الآثار المحتملة لارتفاع درجة حرارة الأرض على النظم البيئية ، فضلا عن حياة الإنسان. لذلك ، تم تصميم هذه الدراسة لدراسة الاتجاهات في درجة الحرارة الدنيا والقصوى ، ويعني ، والرطوبة النسبية وسلسلة زمنية من الأمطار السنوية باستخدام τ كندال اختبار و 10 عاما متوسط متحرك مرشح تمرير منخفض في الطقس 13 - الاجمالية للمحطات وايران القاحلة وشبه القاحلة خلال الخمس والخمسين الماضية. التحليلات تشير إلى اتجاه متزايد بشكل كبير لدرجة الحرارة الدنيا ويعني ، في حين أن الاتجاه الهبوطي لمتوسط الرطوبة النسبية في المناطق القاحلة وشبه القاحلة ، وخاصة ، خلال السنوات القليلة الماضية ، وحتى عام 2000. وهناك زيادة أو نقصان واضح الاتجاه لم يتم العثور على أقصى درجة حرارة. في حين ، وتساقط الأمطار لم تظهر أي زيادة / تناقص الاتجاه لمعظم المحطات التي شملها الاستطلاع. مزيد من الدراسات ، مع وضع برامج طويلة الأجل ، ويوصى التي يتعين الاضطلاع بها لتقييم تغير المناخ وآثاره على هذه المناطق.
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The authors gratefully acknowledge the Iranian Meteorological Organization for providing the data used in this study.
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Kousari, M.R., Asadi Zarch, M.A. Minimum, maximum, and mean annual temperatures, relative humidity, and precipitation trends in arid and semi-arid regions of Iran. Arab J Geosci 4, 907–914 (2011). https://doi.org/10.1007/s12517-009-0113-6
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DOI: https://doi.org/10.1007/s12517-009-0113-6