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- W2381066913 abstract "The chief goal of this article is to explore some changes in the tropical atmospheric interseasonal oscillation(ISO) under the background of global climate warming.Because that the greenhouse gas(CO2 is devoting maximum) increase is the cause of climate warming during 20th century,the global warming's impact on the ISO is explored using the coupled GCM—FGOALS 1.0_g modeling,which is developed in the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics(IAP).The article is divided into two parts: the first part is to investigate the changes in the tropical atmosphere ISO feature simulated by the coupled GCM without anthropogenic forcing(e.g.simulative natural variability),the second part is to investigate the changes in the tropical atmosphere ISO feature under the global warming background induced by CO2 increase(e.g.anthropogenic impact).Based on the coupled climate system model FGOALS 1.0_g control test(the CO2 density maintains no change as the quantity before industrial revolution) simulation result,the interannual and interdecadal variations and the fundamental feature of the tropical ISO under the state of simulated natural variability are studied.It is found that the global ISO chief active region is close to the observation result in the last 56 years,all being situated in the tropical Indian Ocean and the western Pacific Ocean;and the seasonal variation of central place of global ISO chief active region is almost identical with the observation result, which is to the north of equator in summer and to the south in winter;and the global ISO intensity is stronger in summer than in winter.But the simulation ISO intensity is weaker than the observation and the simulation ISO period is weaker and close to high frequency.Based on the control test simulation result without regard to anthropogenic influence,the interannual and interdecadal variations of the tropical ISO feature under the state of simulative natural variability is studied.The results show,firstly the tropical ISO intensity has the remarkable interannual and interdecadal variations,in the phase of low intensity index,ISO intensity in the active region weakens and the range of the active region reduces;in the phase of high intensity index,the results are opposite,but there is seasonal difference,it is not remarkable in winter but remarkable in spring and autumn,which is identical with the observation result.Secondly,under the state of simulative natural variability,the tropical eastward-propagation or westward-propagation ISO energy ratio maintains an equilibrium state,without rising and descent tendency,which is not identical with the observation result that the tropical eastward-propagation ISO energy ratio rises and westward-propagation ISO energy ratio reduces." @default.
- W2381066913 created "2016-06-24" @default.
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- W2381066913 date "2007-01-01" @default.
- W2381066913 modified "2023-09-28" @default.
- W2381066913 title "Numerical Simulation of the Intraseasonal Oscillation Part I:Simulative Natural Variability" @default.
- W2381066913 hasPublicationYear "2007" @default.
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