Abstract
Irrigated production around the world has significantly increased over the last decade. However, climate change is a new threat that could seriously aggravate the irrigation water supplies and request. In this study, the data is derived from the IPCC Fifth Assessment Report (AR5). For the climate change scenarios, five Global Climate Models (GCMs) have been used. By using the CROPWAT approach of Smith, the net irrigation water requirement (IRnet) was calculated. For the estimation of the potential evapotranspiration (Epot), the method in Raziei and Pereira was used. According to representative concentration pathway (RCP) 4.5, these increases vary between 0.74% (North America) and 20.92% (North America) while the RCP 8.5 predict increases of 4.06% (sub-Saharan Africa) to more than 68% (North America). The results also show that the region of Latin America is the region with the large amount of IRnet with coprime value between 1.39 km3/yr (GFDL 4.5) and 1.48 km3/yr (CSIRO 4.5) while sub-Saharan Africa has the smallest IRnet amount between 0.13 km3/yr (GFDL 8.5) and 0.14 km3/yr (ECHAM 8.5). However, the most affected countries by this impact are those in sub-Saharan Africa. This study will probably help decision-makers to make corrections in making their decision.
Highlights
The increasing speed of climate change and related changes in rainfall have officially influenced biological systems and biodiversity on Earth [1]
The World Health Organization (WHO) assessments over the last 30 years have already helped more than 150,000 victims per year due to global warming and precipitation trends caused by anthropogenic climate change [2]
Climate change scenarios were utlized from five Global Climate Models (GCMs) (CSIRO, ECHAM.MPI-ESM-LR, GFDL.ESM2G, MIROC5, and NCAR.CCSM4), for each model two representative concentration pathways (RCP) were chosen
Summary
The increasing speed of climate change and related changes in rainfall have officially influenced biological systems and biodiversity on Earth [1]. Ecological changes are having an impact on the agri-food sector, with implications that have unevenly adapted to the world. The World Health Organization (WHO) assessments over the last 30 years have already helped more than 150,000 victims per year due to global warming and precipitation trends caused by anthropogenic climate change [2]. Many other studies have been undertaken to examine the impact of climate change on animal and plants health [3,4,5,6,7,8]. According to some studies on a global scale, regional variations associated with climate change are not expected to lead to significant changes in food production over the century [5,9].
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