Effect of climate change impact on tourism: A study on climate comfort of Zayandehroud River route from 2014 to 2039

• To calculate PET, it is necessary to determine the meteorological parameters, which are important for human energy balance at a human-bio meteorologically significant height.
• The variables are employed at daily scale, for each of which daily mean has been calculated.
• The second stage deals with evaluation of impacts of climate change on the tourism of studied regions from 2014 to 2039.
• This section was conducted by employing the output of HADCM3 model, two scenarios of B1 and A1B over 2014-2039.
• Finally with recalculation of PET with downscaled data (by LARS-WG5 Software) the suitable weather in future can be guessed.

Climate is an important factor in tourism development, and regarded as invaluable asset in tourism globally. Climate change is currently recognized by most governmental institutions and scientists state this as an important social and environmental issue ahead of the world population, and resources. Here attempts have been made to investigate and analyze the vision and status of tourism climate comfort of Zayandehroud River route at present, and from 2014 to 2039, using HadCM3 model for two A1B and B1 emission scenarios, by PET climate comfort index. The output of the model shows that the ascending trend of temperatures and thereby increased levels of climate comfort can be observed in all stations. The statistical analysis of pet index during 2014–2039 shows a positive trend, followed by a reduction in number of climate comfort days (18 < PET < 29). This indicates that some tourism destinations at the western part of the river are at risk of reduction in number of climate comfort days, because of a higher warming in western areas with a mountainous and colder climate. The impacts of these changes are clear on tourism resources.