Trend Analysis of Extreme Temperature Indices for Marmara Region of Turkey

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Toros H., Abbasnia M.

8th Atmospheric Sciences Symposium, İstanbul, Turkey, 1 - 04 November 2017, pp.548-555

  • Publication Type: Conference Paper / Full Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.548-555
  • Istanbul Technical University Affiliated: Yes


Impacts of extreme weather events are relevant for regional economies and in particular societies. In this study, Fifteen extreme temperature indices are selected and analyzed from the recommended list of the expert group CCL/CLIVAR and for the period of 1961 to 2016 which characterizing a long-term period and with high-quality data. The software used to process the data was the RClimdex 1.1. The trend results at 5% significant level showed that warm spell duration, numbers of summer days, tropical nights, warm nights and warm days have increased, while cold spell duration, ice days, frost days, cool nights and cool days decreased all over Marmara. Summer days have increased on average between 4 to 5 days per decades, While, ice days have decreased on average about 1 day during the whole studied period. Maximum of maximum, minimum of maximum, maximum of minimum and minimum of minimum temperatures have had a positive trend at station scales. Also, diurnal temperature range has slightly increased in most stations, except two southern stations, over the study area. Thus, a large number of stations show significant warming trends for warm days and nights throughout the study area, whereas warm extremes and night-time based temperature indices show greater trends than cold extremes and day-time indices. Overall, the warm extreme temperature events have increased in Marmara during the last decades and it is expected to pronounce by the potential of constant moisture in the Marmara's atmosphere. This is regionally evidencing the importance of the ongoing research on climate change.