Warming Climate, Greening Earth, Carbon Sink

ABSTRACT: A biogeochemical model of vegetation using observed climate data predicts the high northern latitude greening trend over the last two decades observed by satellites, and a marked setback in this trend following the Mount Pinatubo volcano eruption in 1991. The observed trend towards earlier spring budburst and increased maximum leaf area is produced by the model as a consequence of bio-geochemical vegetation responses mainly to changes in temperature. The post-Pinatubo decline in vegetation in 1992-1993 is apparent as the effect of temporary cooling caused by the eruption. High-latitude CO2 uptake during these years is predicted as a consequence of the differential response of heterotrophic respiration and net primary production.