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1.
By using a three-level atmospheric general circulation model (AGCM),we have completed severalnumerical experiments to study the impacts of sea surface temperature anomaly (SSTA) and antarctic icecover anomaly (AICA) during 1981—1983 on climate variability.The results show that during the ElNino period of 1982—1983 the impact of SSTA overrides that of AICA.SSTA mainly affects equatorialzonal circulation and produces PNA wave train,and SE-NW wave train in East Asia to influence theweather of China.AICA produces west-east anomalous vortex streets in the middle latitudes of bothhemispheres and affects the intensity of the polar vortex of Southern Hemisphere.  相似文献   
2.
东亚季风气候对青藏高原隆升的敏感性研究   总被引:22,自引:0,他引:22       下载免费PDF全文
刘晓东  焦彦军 《大气科学》2000,24(5):593-607
青藏高原隆起是东亚季风形成演化的决定因子之一.利用GCM(大气环流模式)完成的一系列改变青藏高原地形高度的数值试验说明,东亚季风气候变化非常敏感地响应于高原隆升.在高原隆升达到现代高度的一半之前,东亚大约30°N以北地区近地面冬夏反向意义下的季风现象是不存在的.高原隆升对东亚冬季风的影响远大于对夏季风的影响.即使没有青藏高原,仅受海陆热力对比的作用,中国东部地区夏季已能出现偏南风;然而只有在青藏高原存在,且达到一定高度的情况下,东亚北方地区冬季才能盛行偏北风.从温湿状况看,大约长江以北的东亚北方季风强度随高原高度上升几乎呈线性增加,冬夏温度对比不断加大,降水也越来越向夏季集中.但长江以南的东亚南方季风和印度季风与此明显不同,前者对高原隆升具有非线性响应,而后者在高原隆升过程中变化不大.  相似文献   
3.
    
A brief introduction is given of the Grid–point 9–layer Atmospheric General Circulation Model (AGCM) developed at the Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences. The results of the 1980–1989 Atmospheric Model Inter-Comparison Program (AMIP) run were compared with observed European Centre for Medium-Range weather Forecasts (ECMWF) temperature data for the same period. The statistical analysis, and Grids Analysis and Display System (GrADS) results have shown that the model holds a great promise in predicting the African climate with considerable accuracy, within and across the seasons. This is a great hope for climate research in Africa which is data-sparse region. On leave from School of Physical Sciences, Imo State University, PMB 2000 Owerri, Nigeria.  相似文献   
4.
基于LASG/IAP大气环流谱模式的气候系统模式   总被引:24,自引:0,他引:24       下载免费PDF全文
文章扼要介绍了基于LASG/IAP大气环流谱模式(SAMIL)的气候系统模式的新版本FGOALS-s的发展和结构。出于发展一个在东亚季风模拟方面有一定优势的气候系统模式之目的,FGOALS-s的大气模式分量SAMIL采用了较高的水平分辨率R42,这相当于2.8125°(经度)×1.66°(纬度),高于三角截断T42的分辨率。对FGOALS-s在模拟大气、陆面、海洋和海冰的气候平均态,以及主要的年际变率信号方面的能力进行了检验。分析表明,FGOALS-s成功地控制了气候漂移趋势,能够较为真实地模拟大气、海洋和陆面的气候平均态,特别是受益于大气模式的较高分辨率,由中国西南向东北延伸的夏季风雨带的分布,在模式中得到较为真实的再现,表明该模式在东亚夏季风的模拟上具有较强能力。耦合模式能够成功再现El Ni~no事件的非规则周期变化,但是其年际变化的振幅较之观测要弱。赤道中西太平洋年际变率的强度较之赤道中东太平洋要强。在中高纬度,模式模拟的北大西洋涛动模态,在空间分布上与观测接近。FGOALS-s模式存在的主要问题,是模拟的热带海温偏冷、而中纬度海温则偏暖,原因是模式模拟的云量分布存在偏差,它直接影响到海表的净热通量收支。模式模拟的北大西洋高纬度地区的海温明显偏冷,令该地区的年平均海冰分布的范围明显偏大;然而受南极周边海温偏高影响,南极洲周围的海冰范围则偏少。FGOALS-s的未来工作重点,宜放在大气模式的云过程、海洋模式的经向能量输送过程、以及海洋与大气的淡水通量耦合方案的改进方面。  相似文献   
5.
This paper investigates the processes behind the double ITCZ phenomenon, a common problem in Coupled ocean-atmosphere General Circulation Models (CGCMs), using a CGCM-FGCM-0 (Flexible General Circulation Model, version 0). The double ITCZ mode develops rapidly during the first two years of the integration and becomes a perennial phenomenon afterwards in the model. By way of Singular ValueDecomposition (SVD) for SST, sea surface pressure, and sea surface wind, some air-sea interactions are analyzed. These interactions prompt the anomalous signals that appear at the beginning of the coupling to develop rapidly. There are two possible reasons, proved by sensitivity experiments: (1) the overestimatedeast-west gradient of SST in the equatorial Pacific in the ocean spin-up process, and (2) the underestimatedamount of low-level stratus over the Peruvian coast in CCM3 (the Community Climate Model, VersionThree). The overestimated east-west gradient of SST brings the anomalous equatorial easterly. The anomalous easterly, affected by the Coriolis force in the Southern Hemisphere, turns into an anomalouswesterly in a broad area south of the equator and is enhanced by atmospheric anomalous circulationdue to the underestimated amount of low-level stratus over the Peruvian coast simulated by CCM3. Theanomalous westerly leads to anomalous warm advection that makes the SST warm in the southeast Pacific.The double ITCZ phenomenon in the CGCM is a result of a series of nonlocal and nonlinear adjustmentprocesses in the coupled system, which can be traced to the uncoupled models, oceanic component, andatmospheric component. The zonal gradient of the equatorial SST is too large in the ocean componentand the amount of low-level stratus over the Peruvian coast is too low in the atmosphere component.  相似文献   
6.
嵌套域大小对区域气候模式模拟效果的影响   总被引:5,自引:3,他引:2       下载免费PDF全文
This paper presents a numerical study on the 1998 summer rainfall over the Yangtze River valley in central and eastern China, addressing effect of a nested area size on simulations in terms of the technique of nesting a regional climate model (RCM) upon a general circulation model (GCM). Evidence suggests that the size exerts greater impacts upon regional climate of the country, revealing that a larger nested size is su perior to a small one for simulation in mitigating errors of GCM-provided lateral boundary forcing. Also,simulations show that the RCM should incorporate regions of climate systems of great importance into study and a low-resolution GCM yields more pronounced errors as a rule when used in the research of the Tibetan Plateau, and, in contrast, our PσRCM can do a good job in describing the plateau′s role in a more realistic and accurate way. It is for this reason that the tableland should be included in the nested area when the RCM is employed to investigate the regional climate. Our PσRCM nesting upon a GCM reaches morerealistic results compared to a single GCM used.  相似文献   
7.
分别采用3种应用比较广泛的水汽方程差分方案:多维正定平流传输方案(MPDATA)、通量修正传输方案(FCT)和两步保形平流方案(TSPAS),对大气物理所9层大气环流模式(IAP 9L AGCM)的降水模拟作敏感性试验,分析比较3种方案下模式降水气候平均场的差异,从而揭示模式降水对水汽方程差分方案的敏感性.试验结果显示,不同的水汽方程差分方案对大气环流模式降水的气候模拟有较大影响,并由此从3种差分方案中为IAP 9L AGCM寻找出一种较好的水汽计算方案.  相似文献   
8.
通过非对流云的气候资料分析和个例分析表明:(1)非对流云有季节变化,也随海陆分布的不同而变化,还与大气三圈环流及季风等密切相关。由于它们的相关性,在大气环流模式(GCM)中对非对流云的模拟必须与提高模式其他部分的模拟能力相辅相成。(2)产生于中高纬度大范围上升气流的非对流云,由赤道辐合带积云对流所致的高空赤道地区的卷云与卷层云和形成于副热带冷海水上空的层云与层积云是新一代大气环模式显式预报的3类主要非对流云。这3类非对流云均是大尺度的,GCM的网格能显示分辨,但在垂直方向如何提高GCM的分辨率问题仍是一个有待研究的问题。(3)在GCM中如何模拟冷海水上空的层云和赤道ITCZ所对应的大范围卷云和卷层云是十分困难和必要的。(4)通过对东亚及西太平洋区域非对流云系的个例分析,可以认为在新一代大气环流模式中,应显式预报行星大槽及赤道辐合带所对应的非对流云系。在模拟这些非对流云系时,应考虑它们的生消过程、平流过程与辐射过程。由于一段时间内大气环流模式尚难以分辨锋面与α中尺度的气旋,因此有必要在GCM中参数化这些系统,或采用更小的网格距。至于对非对流云所对应的降水参数化问题的研究,需要进一步的观测为基础。  相似文献   
9.
余志豪  李海盛 《气象科学》2000,21(3):289-297
本文将BATS方案的一些简化结果,引入到GCM(R15L9)中,使得积雪也作为模式的一个预报量,实现了雪、气间可以相互作用。此种改进的模式,文中称作SF-GCM。在模式中,积雪变化不仅体现在覆盖面积和反照率上,还能计算出相应的积雪深度、积雪时间和融雪吸热等等雪的各种参量。用该模式进行了9年的时间积分,所得到的青藏高原积雪时、空分布特征与实际观测到的情况比较相近。  相似文献   
10.
By using IAP 9L AGCM, two sets of long-term climatological integration have been per-formed with the two different interpolation procedures for generating the daily surface boundary conditions. One interpolation procedure is the so-called “traditional” scheme, for which the daily surface boundary conditions are obtained by linearly interpolating between the observed monthly mean values, however the observed monthly means cannot be preserved after interpolation. The other one is the “new” scheme, for which the daily surface boundary conditions are obtained by linearly interpolating between the "artificial" monthly mean values which are based on, but are dif-ferent from the observed ones, after interpolating with this new scheme, not only the observed monthly mean values are preserved, the time series of the new generated daily values is also more consistent with the observation. Comparison of the model results shows that the differences of the globally or zonally averaged fields between these two integrations are quite small, and this is due to the 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 magni-tude of the difference in the JJA mean rainfall between these two integrations can exceed 2 mm/day over Asian monsoon regions, and the difference in DJF mean surface air temperature can also exceed 2oC over this region. The fact that the model climatology depends quite strongly on the method of prescribing the daily surface boundary conditions suggests that in order to validate the climate model or to predict the short-term climate anomalies, either the " new* interpolation scheme or the high frequency surface boundary 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 cli?mate models (e.g., atmospheric and oceanic general circulation models) is preferred in order to partly eliminate the “climate drift” problem which may appear during the course of direct coupling.  相似文献   
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