Peter Levy

TL;DR: In the past 50 years, the fraction of CO2 emissions that remains in the atmosphere each year has likely increased, from about 40% to 45%, and models suggest that this trend was caused by a decrease in the uptake of CO 2 by the carbon sinks in response to climate change and variability as mentioned in this paper.

TL;DR: In this paper, the authors test the ability of five Dynamic Global Vegetation Models (DGVMs), forced with observed climatology and atmospheric CO2, to model the contemporary global carbon cycle.

TL;DR: In this paper, the authors present a methodology developed by the global carbon cycle science community to quantify all major components of global carbon budget, including their uncertainties, and provide a baseline to keep track of annual carbon budgets in the future.

TL;DR: Carbon-nitrogen interactions significantly influence the simulated response of carbon cycle to temperature and atmospheric CO2 concentration, suggesting that nutrients limitations should be included in the next generation of terrestrial biosphere models.

TL;DR: In this article, a suite of nine dynamic global vegetation models and four ocean biogeochemical general circulation models were used to estimate trends driven by global and regional climate and atmospheric CO2 in land and oceanic CO2 exchanges with the atmosphere over the period 1990-2009, to attribute these trends to underlying processes in the models, and to quantify the uncertainty and level of inter-model agreement.