2023-09-01 ミシガン大学
◆これに対処する政策や措置がない限り、気候変動により既存の地下水枯渇問題が悪化する見込みです。これは、インドが主要な食糧供給国であることに影響を及ぼす可能性があります。
＜関連情報＞
- https://news.umich.edu/groundwater-depletion-rates-in-india-could-triple-in-coming-decades-as-climate-warms-study-shows/
- https://www.science.org/doi/10.1126/sciadv.adi1401
気温上昇でインドの地下水枯渇率が悪化 Warming temperatures exacerbate groundwater depletion rates in India
Nishan Bhattarai,David B. Lobell,Balwinder-Singh,Ram Fishman,William P. Kustas,Yadu Pokhrel,and Meha Jain
Science Advances Published:1 Sep 2023
DOI:https://doi.org/10.1126/sciadv.adi1401
Abstract
Climate change will likely increase crop water demand, and farmers may adapt by applying more irrigation. Understanding the extent to which this is occurring is of particular importance in India, a global groundwater depletion hotspot, where increased withdrawals may further jeopardize groundwater resources. Using historical data on groundwater levels, climate, and crop water stress, we find that farmers have adapted to warming temperatures by intensifying groundwater withdrawals, substantially accelerating groundwater depletion rates in India. When considering increased withdrawals due to warming, we project that the rates of net groundwater loss for 2041–2080 could be three times current depletion rates, even after considering projected increases in precipitation and possible decreases in irrigation use as groundwater tables fall. These results reveal a previously unquantified cost of adapting to warming temperatures that will likely further threaten India’s food and water security over the coming decades.
