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Titolo:
Importance of vegetation feedbacks in doubled-CO2 climate experiments
Autore:
Douville, H; Planton, S; Royer, JF; Stephenson, DB; Tyteca, S; Kergoat, L; Lafont, S; Betts, RA;
Indirizzi:
UDC, GMGEC, CNRM, Meteo France, F-31057 Toulouse 1, France UDC Toulouse France 1 EC, CNRM, Meteo France, F-31057 Toulouse 1, France LET, CNRS, F-31405 Toulouse, France LET Toulouse France F-31405LET, CNRS, F-31405 Toulouse, France Hadley Ctr Climate Predict & Res, Meteorol Off, Bracknell RG12 2SY, Berks,England Hadley Ctr Climate Predict & Res Bracknell Berks England RG12 2SY England
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D11, volume: 105, anno: 2000,
pagine: 14841 - 14861
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAND-SURFACE PROCESSES; CARBON-DIOXIDE; MODEL; CO2; GCM; ATMOSPHERE; SENSITIVITY; SIMULATION; SCALE; PARAMETERIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Douville, H UDC, GMGEC, CNRM, Meteo France, 42 Ave Coriolis, F-31057 Toulouse 1, France UDC 42 Ave Coriolis Toulouse France 1 1057 Toulouse 1, France
Citazione:
H. Douville et al., "Importance of vegetation feedbacks in doubled-CO2 climate experiments", J GEO RES-A, 105(D11), 2000, pp. 14841-14861

Abstract

The rising atmospheric concentration of carbon dioxide resulting from the burning of fossil fuels and deforestation is likely to provoke significant climate perturbations, while having far-reaching consequences for the terrestrial biosphere. Some plants could maintain the same intake of CO2 for photosynthesis by reducing their stomatal openings, thus limiting the transpiration and providing a positive feedback to the projected surface warming. Other plants could benefit from the higher CO2 level and the warmer climate to increase their productivity, which would on the contrary promote the transpiration. The relevance of these feedbacks has been investigated with theMeteo-France atmospheric general circulation model. The model has been runat the T31 spectral truncation with 19 vertical levels and is forced with sea surface temperature and sea ice anomalies provided by a transient simulation performed with the Hadley Centre coupled ocean-atmosphere model. Besides a reference doubled-CO2 experiment with no modification of the vegetation properties, two other experiments have been performed to explore the impact of changes in the physiology (stomatal resistance) and structure (leaf area index) of plants. Globally and annually averaged, the radiative impactof the CO2 doubling leads to a 2 degrees C surface warming and a 6% precipitation increase, in keeping with previous similar experiments. The vegetation Feedbacks do not greatly modify the model response on the global scale. The increase in stomatal resistance does not systematically lead to highernear-surface temperatures due to changes in the soil wetness annual cycle and the atmospheric circulation. However, both physiological and structuralvegetation feedbacks are evident on the regional scale. They are liable tomodify the CO2 impact on the hydrological cycle, as illustrated for the case of the European summertime climate and the Asian summer monsoon. The strong sensitivity of the climate in these areas emphasizes the large uncertainties of climate change predictions for some of the most populated regions of the world and argues for the need to include more interactive land surface processes in current generation climate models.

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Documento generato il 10/07/20 alle ore 02:34:07