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《大气科学进展(英文版)》 1999-04
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Dependence of the AGCM Climatology on the Method of Prescribing Surface Boundary Conditions and Its Climatological Implication

Lin Zhaohui ; Bi Xunqiang ; Wang Hui jun,and Zeng QingcunLASG, Institule of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029  
By using IAP 9L AGCM, two sets of long-term climatological integration have been performed with the two different interpolation procedures for generating the daily surface boundaryconditions. One interpolation procedure is the so-called" traditional" scheme, for which the dailysurface boundary conditions are obtained by linearly interpolating between the observed monthlymean values, however the observed monthly means cannot be preserved after interpolation. Theother one is the "new" scheme, for which the daily surface boundary conditions are obtained bylinearly interpolating between the "artificial" monthly mean values which are based on, but are different from the observed ones, after interpolating with this new scheme, not only the observedmonthly mean values are preserved, the time series of the new generated daily values is also moreconsistent with the observation. Comparison of the model results shows that the differences of theglobally or zonally averaged fields between these two integrations are quite small, and this is due tothe compensating effect between the different regions. However, the differences of the two patterns(the global or regional geographical distributions), are quite significant, for example, the magnitude of the difference in the JJA mean rainfall between these two integrations can exceed 2mm/ day over Asian monsoon regions, and the difference in DJF mean surface air temperaturecan also exceed 2℃ over this region.The fact that the model clhatology depends quite strongly on the method of prescribing the dailysurface boundary conditions snggests that in order to validate the climate model or to predict theshort-term climate anomalies, either the "new" interpolation scheme or the high frequency surfaceboundary conditions (e.g., daily or weekly data instead of the monthly data) should be introduced.Meanwhile, as for the coupled model, the daily coupling scheme between the different component climate models (e.g., atmospheric and oceanic general circulation models) is preferred in order to partlyeliminate the "climate drift" problem which may appear during the course of direct coupling.
【CateGory Index】: P46
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【Co-references】
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