title: Projected impacts of climate change on farmers' extraction of groundwater from crystalline aquifers in South India.
abstract: Local groundwater levels in South India are falling alarmingly. In the semi-arid crystalline Deccan plateau area, agricultural production relies on groundwater resources. Downscaled Global Climate Model (GCM) data are used to force a spatially distributed agro-hydrological model in order to evaluate Climate Change (CC) effects on local groundwater extraction (GWE). The slight increase of precipitation may alleviate current groundwater depletion on average, despite the increased evaporation due to warming. Nevertheless, projected climatic extremes create worse GWE shortages than for present climate. Local conditions may lead to opposing impacts on GWE, from increases to decreases (+/-20 mm/year), for a given spatially homogeneous CC forcing. Areas vulnerable to CC in terms of irrigation apportionment are thus identified. Our results emphasize the importance of accounting for local characteristics (water harvesting systems and maximal aquifer capacity versus GWE) in developing measures to cope with CC impacts in the South Indian region.
authors.affiliation: 1] Université de Toulouse, UPS (OMP), GET, 14 av. Edouard Belin, F-31400 Toulouse, France [2] IRD, CNRS, GET, F-31400 Toulouse, France [3] UPS, IRD, CNRS, CNES, CESBIO, 18 av. Edouard Belin 31400 Toulouse.
authors.forename: Sylvain
authors.initials: S
authors.lastname: Ferrant
authors.affiliation: BRGM, Water Division, NRE Unit, 1039 rue de Pinville, 34000 Montpellier, France.
authors.forename: Yvan
authors.initials: Y
authors.lastname: Caballero
authors.affiliation: 1] BRGM, Water Division, NRE Unit, 1039 rue de Pinville, 34000 Montpellier, France [2] Indo-French Centre for Groundwater Research, N.G.R.I., Uppal Road, Hyderabad 500 606, India.
authors.forename: Jérome
authors.initials: J
authors.lastname: Perrin
authors.affiliation: 1] Université de Toulouse, UPS (OMP), GET, 14 av. Edouard Belin, F-31400 Toulouse, France [2] UPS, IRD, CNRS, CNES, CESBIO, 18 av. Edouard Belin 31400 Toulouse.
authors.forename: Simon
authors.initials: S
authors.lastname: Gascoin
authors.affiliation: BRGM, Water Division, NRE Unit, 1039 rue de Pinville, 34000 Montpellier, France.
authors.forename: Benoit
authors.initials: B
authors.lastname: Dewandel
authors.affiliation: BRGM, Water Division, NRE Unit, 1039 rue de Pinville, 34000 Montpellier, France.
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Aulong
authors.affiliation: SIRS, 27 rue du Carrousel, Parc de la Cimaise, 59 650 Villeneuve d'Ascq, France.
authors.forename: Fabrice
authors.initials: F
authors.lastname: Dazin
authors.affiliation: Indo-French Centre for Groundwater Research, N.G.R.I., Uppal Road, Hyderabad 500 606, India.
authors.forename: Shakeel
authors.initials: S
authors.lastname: Ahmed
authors.affiliation: BRGM, Water Division, NRE Unit, 1039 rue de Pinville, 34000 Montpellier, France.
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Maréchal