Anomaly of greenness and snow cover duration.
a Infrared false-color SPOT 5 image (10 m resolution) showing the locations of the three study catchments (Lauzelle, Roche Noire, Mandette) in the above-treeline ecosystems of the southwestern French Alps, located between the Lautaret and Galibier passes. The black square marks the position of the FluxAlp weather station. b Standardized Anomaly of Greenness (SAG) derived from multi-temporal 10 m resolution SPOT 5 images collected during the 2015 growing season. For each pixel, SAG represents the standardized difference between the annual maximum of the normalized difference vegetation index (NDVI) and the mean NDVI for all pixels in a similar topographic context, defined by elevation within ±50 m and Diurnal Anisotropic Heating within ±0.1 (Methods).
[7/8] Ces effets de « mémoire » compliquent la modélisation de la biodiversité, car ils montrent que les écosystèmes alpins réagissent avec retard aux changements climatiques. Les anomalies de végétation ou de sols sont les traces de ce passé neigeux. #geography #Alps #snowcover #climatechange