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ENSO and Indian Ocean dipole mode in three coupled GCMs

Acta Oceanologica Sinica 2004年第4期23卷 581-595页

作者： yuyongqiang liuxiying LASG InstituteofAtmosphericPhysicsChineseAcademyofSciencesBeijing100029China

The simulated ENSO and Indian Ocean dipole (IOD) mode events from three coupled GCMs with the same oceaniccomponent model, CPM0, CPM1 and FGCM0, are compared. The only difference between the CPM0 and theCPM1 comes from the coupling scheme at the airsea interface, e.g., flux anomaly coupling scheme for the former anddirect coupling scheme for the latter. The FGCM0 is also a directly coupled GCM, but its atmospheric componentmodel is the NCAR CCM3 rather than the NCC T63AGCM as in the other two coupled GCMs CPM0 and *** three coupled models show El Nio-like interannual variability in the tropic Pacific, but the FGCM0 shows a bitstronger amplitude of El Nio events and both the CPM0 and the CPM1 show much weaker amplitude than theobserved one. In the meanwhile, the quasi-biennial variability dominates in the FGCM0 simulations, and 4 a andlonger periods are significant in both the CPM0 and CPM1 models. As the El Nio events simulated by the threecoupled GCMs, the simulated Indian Ocean dipole mode events are stronger from the coupled model FGCM0 andweaker from both the CPM0 and CPM1 models than those from observation.

关键词： ENSO Indian Ocean dipole coupled models

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Weak response of the Atlantic thermohaline circulation to an increase of atmospheric car-bon dioxide in IAP/LASG Climate System Model

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Chinese Science Bulletin 2005年第6期50卷 592-598页

作者： ZHOUTianjun YURucong liuxiying GUOYufu yuyongqiang ZHANGXuehong LASG InstituteofAtmosphericPhysicsChineseAcademyofSciencesBeijing100029China

Response of the Atlantic thermohaline circula- tion (THC) to global warming is examined by using the cli- mate system model developed at IAP/LASG. The evidence indicates that the gradually warming climate associated with the increased atmospheric carbon dioxide leads to a warmer and fresher sea surface water at the high latitudes of the North Atlantic Ocean, which prevents the down-welling of the surface water. The succedent reduction of the pole-to- equator meridional potential density gradient finally results in the decrease of the THC in intensity. When the atmos- pheric carbon dioxide is doubled, the maximum value of the Atlantic THC decreases approximately by 8%. The associ- ated poleward oceanic heat transport also becomes weaker. This kind of THC weakening centralizes mainly in the northern part of the North Atlantic basin, indicating briefly a local scale adjustment rather than a loop oscillation with the whole Atlantic “conveyor belt” decelerating.

关键词：大西洋热盐大气二氧化碳 IAP/LASG 气候

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