Abstract:
:Plants influence extreme heat events by regulating land-atmosphere water and energy exchanges. The contribution of plants to changes in future heat extremes will depend on the responses of vegetation growth and physiology to the direct and indirect effects of elevated CO2. Here we use a suite of earth system models to disentangle the radiative versus vegetation effects of elevated CO2 on heat wave characteristics. Vegetation responses to a quadrupling of CO2 increase summer heat wave occurrence by 20 days or more-30-50% of the radiative response alone-across tropical and mid-to-high latitude forests. These increases are caused by CO2 physiological forcing, which diminishes transpiration and its associated cooling effect, and reduces clouds and precipitation. In contrast to recent suggestions, our results indicate CO2-driven vegetation changes enhance future heat wave frequency and intensity in most vegetated regions despite transpiration-driven soil moisture savings and increases in aboveground biomass from CO2 fertilization.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Skinner CB,Poulsen CJ,Mankin JSdoi
10.1038/s41467-018-03472-wsubject
Has Abstractpub_date
2018-03-15 00:00:00pages
1094issue
1issn
2041-1723pii
10.1038/s41467-018-03472-wjournal_volume
9pub_type
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