Fig. 3: Geographical distribution of maximum areas associated with water surplus and water deficit responses as well as the areas associated with changed response times to water surplus and water deficit over the last three decades.
From: Observed increasing water constraint on vegetation growth over the last three decades
a Presents the maximum area composite of significant positive correlation (water deficit response) between normalized difference vegetation index (NDVI) anomaly and Standardized Precipitation-Evapotranspiration Index (SPEIs) from 1- to 24-month time-scale (gold color); b the maximum area composite of significant negative correlation (water surplus response) between NDVI anomaly and SPEIs from 1- to 24-month time-scale (green color); c area associated with change of response time to water deficit; d area associated with change of response time to water surplus response. The red and blue bars in (c, d) represent the areas of decreased and increased response time, respectively.
