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Titolo:
SENSITIVITY TO PRESCRIBED CHANGES IN SEA-SURFACE TEMPERATURE AND SEA-ICE IN DOUBLED CARBON-DIOXIDE EXPERIMENTS
Autore:
TIMBAL B; MAHFOUF JF; ROYER JF; CARIOLLE D;
Indirizzi:
METEO FRANCE,CNMR,GMGEC,42 AVE G CORIOLIS F-31057 TOULOUSE FRANCE
Titolo Testata:
Climate dynamics
fascicolo: 1, volume: 12, anno: 1995,
pagine: 1 - 20
SICI:
0930-7575(1995)12:1<1:STPCIS>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
OCEAN-ATMOSPHERE MODEL; SPATIAL VARIABILITY; FEEDBACK PROCESSES; CO2 CLIMATE; CLOUD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
B. Timbal et al., "SENSITIVITY TO PRESCRIBED CHANGES IN SEA-SURFACE TEMPERATURE AND SEA-ICE IN DOUBLED CARBON-DIOXIDE EXPERIMENTS", Climate dynamics, 12(1), 1995, pp. 1-20

Abstract

Time sclice experiments are performed with the atmospheric GCM ARPEGE, developed at Meteo-France, to study the impact to increases in the atmospheric carbon dioxide. This spectral model runs at T42 horizontal resolution with 30 vertical layers including a comprehensive tropospheric and stratospheric resolution and a prognostic parameterization of the ozone mixing ratio. The model is forced in a 5-year control run byclimatological SSTs and sea-ice extents in order to obtain an accurate simulation of the present-day climate. Two perturbed runs are performed using SSTs and sea-ice extents for doubled CO2 concentration, obtained from transient runs performed by two coupled atmospheric-oceanic models run at the Max Planck Institute (MPI) in Hamburg and the HadleyCentre (HC). A global surface temperature warming of 1.6 K is obtained with the MPI SST anomalies and 1.9 K with the HC SST anomalies. The precipitation rate increases by 4.2% (and 4.7%). The features obtainedin the stratosphere (a cooling increasing with the altitude and an increase in the ozone mixing ratio) are not sensitive to the oceanic forcing. On the contrary, the ano malies in the troposphere such as a warming increasing with altitude, an acceleration of westerly jets and a raised cloud height, depend on the oceanic forcing imposed in the two perturbed runs. Special attention is given to continental areas where the impact of the oceanic forcing is studied over eight regions aroundthe globe. Regions sensitive to oceanic forcing such as Europe are identified in contrast with areas where the patterns are driven by land-surface physical processes, such as over continental Asia. Finally, the Koppen classification is applied to the climate simulated in the three experiments. Both doubled CO2 runs show the same predominance of global warming over precipitation changes in the Koppen analyses.

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Documento generato il 27/11/20 alle ore 10:32:44