This research aims at providing a statistical framework for detection and attribution of climate variability and change at regional scale when at least 30 years of observation data are available. While extensive research has been done on detecting significant observed trends in hydroclimate variables and attribution to anthropogenic greenhouse gas emissions in large continents, less attention has been paid for regional scale analysis. The latter is mainly important for adaptation to climate change in different sectors including but not limited to energy, agriculture, and water resources planning and management, and it is still an open discussion in many countries including the West Asian ones. In the absence of regional climate models, an informative framework is suggested providing useful insights for policymakers. It benefits from general flexibility, not being computationally expensive, and applying several trend tests to analyze temporal variations in temperature and precipitation (gradual and step changes). The framework is implemented for a very important river basin in the west of Iran. In general, some increasing and decreasing trends of the interannual precipitation and temperature have been detected. For precipitation annual time series, a reducing step was seen around 1996 compared with the gradual change in most of the stations, which have not experience a dramatical change. The range of natural forcing is found to be ±76 % for precipitation and ±1.4 °C for temperature considering a two-dimensional diagram of precipitation and temperature anomalies from 1000-year control run of global climate model (GCM). Findings out of applying the proposed framework may provide useful insights into how to approach structural and non-structural climate change adaptation strategies from central governments.
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The paper presents a part of a research project “Analysis of Spatiotemporal Climate Variability in the Past and Attribution of Greenhouse Gases Emission for Karkheh Basin”. The project is done at the Department of Water Sciences and Engineering, Ahvaz branch, Islamic Azad University of Iran. The authors wish to thank the Ahvaz branch, Islamic Azad University of Iran for their valuable supports. We acknowledge the Khuzestan Water and Power Authority (KWPA) and the Islamic Republic of Iran Meteorological Organization (IRIMO) for providing datasets for this research. Authors also would like to thank the editor and the anonymous reviewers for their suggestions, which significantly improve the contents of this paper.
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Zohrabi, N., Goodarzi, E., Massah Bavani, A. et al. Detection and attribution of climate change at regional scale: case study of Karkheh river basin in the west of Iran. Theor Appl Climatol 130, 1007–1020 (2017). https://doi.org/10.1007/s00704-016-1896-5
- Statistical analysis
- Regional climate variability and change
- Detection and attribution
- Karkheh Basin