Carbon dioxide induced stomatal closure increases radiative forcing via a rapid reduction in low cloud
- 24 January 2009
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 36 (2)
- https://doi.org/10.1029/2008gl036273
Abstract
We performed an ensemble of twelve five-year experiments using a coupled climate-carbon-cycle model with scenarios of prescribed atmospheric carbon dioxide concentration; CO2 was instantaneously doubled or quadrupled at the start of the experiments. Within these five years, climate feedback is not significantly influenced by the effects of climate change on the carbon system. However, rapid changes take place, within much less than a year, due to the physiological effect of CO2 on plant stomatal conductance, leading to adjustment in the shortwave cloud radiative effect over land, due to a reduction in low cloud cover. This causes a 10% enhancement to the radiative forcing due to CO2, which leads to an increase in the equilibrium warming of 0.4 and 0.7 K for doubling and quadrupling. The implications for calibration of energy-balance models are discussed.Keywords
This publication has 13 references indexed in Scilit:
- Climate response to the physiological impact of carbon dioxide on plants in the Met Office Unified Model HadCM3Climate Dynamics, 2008
- CO2 forcing induces semi‐direct effects with consequences for climate feedback interpretationsGeophysical Research Letters, 2008
- Tropospheric Adjustment Induces a Cloud Component in CO2 ForcingJournal of Climate, 2008
- Mechanisms for the land/sea warming contrast exhibited by simulations of climate changeClimate Dynamics, 2007
- How Well Do We Understand and Evaluate Climate Change Feedback Processes?Journal of Climate, 2006
- Climate–Carbon Cycle Feedback Analysis: Results from the C4MIP Model IntercomparisonJournal of Climate, 2006
- A new method for diagnosing radiative forcing and climate sensitivityGeophysical Research Letters, 2004
- Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate modelNature, 2000
- The impact of new land surface physics on the GCM simulation of climate and climate sensitivityClimate Dynamics, 1999
- Contrasting physiological and structural vegetation feedbacks in climate change simulationsNature, 1997