This map shows the crop water limitation index expressed as the ratio between actual and theoretical (unlimited water) production averaged over all crop types — and its projected changes under IPCC B1 and A2 climate and emissions scenarios in absolute change in the crop water limitation index. The values represent the average over the growing period for all crop types present in a grid cell. Note that no adaptation is assumed and that in regions that are irrigated today (not considered here) the ratio is likely to be close to 1. Based on the LPJmL (Lund-Potsdam-Jena managed Land Dynamic Global Vegetation and Water Balance Model) vegetation and water balance model using the ensemble mean from 21 General Circulation Models (GCMs) that took part in the 4th IPCC Assessment (Randall et al., 2007). More information is available in Gerten, 2009.
Water limitation index / Change of water limitation
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