共查询到20条相似文献，搜索用时 62 毫秒
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１９９８年７－８月,运用ＬＡＳＧη坐标有限区域数值预报模式进行了四川盆地的业务定量降水数值预报的试验表明：虽然晴雨预报ＴＳ平均评分超过０．７,但个别个例ＴＳ评分偏低。本文对试验期间ＴＳ评分最高和最低的两个个例进行分析,结果表明：降水预报的准确性与盆地内外特征物理量场的分布有关。当盆地外的大气状况的分布有利于降水时,盆是内降水预报的准确性也更高。 相似文献
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《中国气象科学研究院年报》1994,(1)
ＳＴＵＤＹＯＦＯＺＯＮＥＡＮＤＩＴＳＰＲＥＣＵＲＳＯＲＳＡＴＬＩＮ’ＡＮＲＥＧＩＯＮＡＬＢＡＣＫＧＲＯＵＮＤＳＴＡＴＩＯＮＤＵＲＩＮＧＴＨＥＰＥＭ－ＷＥＳＴ－ＡＥＸＰＥＲＩＭＥＮＴＬｕｏＣｈａｏ（罗超），ｍｎｇＧｕｏａｎ（丁国安），Ｔａｎｇｊｉｅ（汤... 相似文献
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GROUND-BASED MEASUREMENTS OF COLUMN ABUNDANCE OF OZONE AN 总被引：1，自引：0，他引：1
ＧＲＯＵＮＤ－ＢＡＳＥＤＭＥＡＳＵＲＥＭＥＮＴＳＯＦＣＯＬＵＭＮＡＢＵＮＤＡＮＣＥＯＦＯＺＯＮＥＡＮＤＵＶ－ＢＲＡＤＩＡＴＩＯＮＯＶＥＲＺＨＯＮＧＳＨＡＮＳＴＡＴＩＯＮ，ＡＮＴＡＲＣＴＩＣＡＦＯＲＴＨＥ１９９３“ＯＺＯＮＥＨＯＬＥ”ＺｈｏｕＸｉｕｊｉ... 相似文献
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《中国气象科学研究院年报》1994,(1)
ＡＮＵＭＥＲＩＣＡＬＥＸＰＥＲＩＭＥＮＴＯＮＴＨＥＩＮＦＬＵＥＮＣＥＳＯＦＴＨＥＱＩＮＧＨＡＩ－ＸＩＺＡＮＧＰＬＡＴＥＡＵＯＮＴＨＥＵＰＳＴＲＥＡＭＢＬＯＣＫＩＮＧＥＶＥＮＴＺｈｅｎｇＱｉｎｇｌｉｎ（郑庆林），ＧｕＹｕ（古瑜），ＳｏｎｇＱｉｎｇｌｉ（... 相似文献
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ＴＨＥＣＨＡＮＧＥＳＡＮＤＣＬＩＭＡＴＩＣＪＵＭＰＳＩＮＦＥＲＲＥＤＦＲＯＭＴＨＥＡＧＲＩＣＵＬＴＵＲＡＬＤＲＹＮＥＳＳＡＮＤＷＥＴＮＥＳＳＩＮＴＨＥＣＨＡＮＧＪＩＡＮＧ－ＨＵＡＩＨＥＶＡＬＬＥＹＦＯＲＴＨＥＬＡＳＴ５００ＹＥＡＲＳＸｕｅＨｅｎｇ（薛... 相似文献
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郑关林 《中国气象科学研究院年报》1996,(1)
ＡＤＶＡＮＣＥＳＩＮＴＨＥＭＯＮＴＨＬＹ，ＳＥＡＳＯＮＡＬＡＮＤＹＥＡＲＬＹＬＯＮＧ－ＲＡＮＧＥＮＵＭＥＲＩＣＡＬＷＥＡＴＨＥＲＰＲＥＤＩＣＴＩＯＮ￥ＺｈｅｎｇＱｉｎｇｌｉｎ（郑关林）ＡＤＶＡＮＣＥＳＩＮＴＨＥＭＯＮＴＨＬＹ，ＳＥＡＳＯＮＡＬＡＮＤＹ... 相似文献
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海气相互作用研究进展——美国海－气相互作用第九届学术会内容简介吴国雄（中国科学院大气物理研究所ＬＡＳＧ①,北京１０００８０）海气相互作用不仅影响着风暴、气旋等短期天气过程,还影响着季风、大气涛动以及年代际变化等气候过程。ＡＭＳ第７８届年会期间举办了第... 相似文献
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用IAP/LASG GOALS模式模拟CO_2增加引起的东亚地区气候变化(英文) 总被引：9，自引：0，他引：9
用一个全球耦合的海洋──大气──陆地系统模式（ＩＡＰ／ ＬＡＳＧ ＧＯＡＬＳ）研究因 ＣＯ２增加引起的全球增暖,重点是讨论东亚地区气候变化。完成了两个试验,一个是ＣＯ２含量保持不变的对照试验,一个是ＣＯ２浓度按每年１０％增加的扰动试验。结果表明,在对照试验中没有出现气候漂移,在ＣＯ２含量加倍时全球平均地面气温将增加１．６５℃。ＧＯＡＬＳ模式能较好模拟观测的东亚温度和降水的空间分体和年循环,但模拟的年平均温度略偏低、年降水稍偏大。在ＣＯ２含量加倍时,东亚地区温度和降水将分别增加２．１℃和５％,最大增温出现在中纬度大陆上,最大的降水增加出现在２５°Ｎ附近。 相似文献
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Global Coupled Ocean-Atmosphere General Circulation Models in LASG／IAP 总被引：28，自引：11，他引：17
Coupled ocean-atmospheric general circulation models are the only tools to quantitatively simulate the climate system. Since the end of the 1980s, a group of scientists in the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), have been working to develop a global OGCM and a global coupled ocean-atmosphere general circulation model (CGCM). From the original flux anomalycoupling model developed in the beginning of the 1990s to the latest directly-coupling model, LASG scientists have developed four global coupled GCMs. This study summarizes the development history of these models and describes the third and fourth coupled GCMs and selected applications. Strengths and weaknesses of these models are highlighted. 相似文献
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对中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室的全球海一陆一气耦合气候系统模式(GOALS／LASG)的大气分量进行了发展，主要是提高模式的分辨率。水平分辨率由原来的菱形15波截断(R15)提高到菱形42波截断（R42)；并用实际的海温、海冰为外强迫积分模式10年，将积分结果与观测资料比较以检验模式的气候模拟性能，重点是检验全球季节变化和年际变化的模拟能力。从检验结果看，分辨率增加后模式能成功地模拟出全球气候的主要特征，多种要素场的季节变化与观测也一致；对EI Nifio的响应特征也有很好的反映。但与其它气候模式一样，也存在一些误差。对结果的分析表明，云、辐射方案影响模式的能量平衡，进而影响陆面系统的模拟及降水的分布：对流参数化方案对模拟结果也有很大影响。 相似文献
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In this paper, we examine the performance of the 26-level version of the SAMIL/LASG GCM (R42/L26) in simulating the seasonal cycle and perpetual winter mean stratospheric circulation as well as its variability by comparing them with the NCEP/NCAR reanalysis. The results show that the model is capable of reproducing many key features of the climatology and seasonal variation of the stratospheric circulation despite that the model’s mean polar vortex is stronger and more zonally symmetric compared to the obse... 相似文献
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The Performance of Atmospheric Component Model R42L9 of GOALS／LASG 总被引：26，自引：0，他引：26
This paper examines the performance of an atmospheric general circulation model (AGCM) developed at the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics (LASG/IAP). It is a spectral model truncated at R42(2.8125°long×1.66°lat) resolution and with nine vertical levels, and referred to as R42L9/LASG hereafter. It is also the new version of atmospheric component model R15L9 of the global ocean-atmosphere-land system (GOALS/LASG). A 40-year simulation in which the model is forced with the climatological monthly mean sea surface temperature is compared with the 40-year (1958-97) U.S. National Center for Environmental Prediction (NGEP) global reanalysis and the 22-year (1979-2000) Xie-Arkin monthly precipitation climatology. The mean DJF and JJA geographical distributions of precipitation, sea level pressure, 500-hPa geopotential height, 850-hPa and 200-hPa zonal wind, and other fields averaged for the last 30-year integrat 相似文献
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在第1部分水平分辨率提高的基础上，提高了中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室的全球海-陆-气耦合气候系统模式(GOALS／LASG)大气模式分量的垂直分辨率。为减少地形对平流层的影响，并和其它气候模式一致，建立了基于能量守恒和角动量守恒的垂直混合坐标方案，及混合坐标下的半隐式时间积分方案，并对相关的物理过程作必要的调整。尽管主要物理过程不变，但从初步结果来看，对大气垂直结构的模拟更合理；平流层风场和温度场的模拟与观测更接近；降水、海平面气压场的分布及季节变化等特征也有明显改进。 相似文献
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A fast version of LASG/IAP climate system model and its 1000-year control integration 总被引：2，自引：1，他引：1
A fast version of the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geo- physical Fluid Dynamics(LASG)/Institute of Atmospheric Physics(IAP)climate system model is briefly documented.The fast coupled model employs a low resolution version of the atmospheric component Grid Atmospheric Model of IAP/LASG(GAMIL),with the other parts of the model,namely an oceanic component LASG/IAP Climate Ocean Model(LICOM),land component Common Land Model(CLM),and sea ice component from National Center for Atmospheric Research Community Climate System Model (NCAR CCSM2),as the same as in the standard version of LASG/IAP Flexible Global Ocean Atmosphere Land System model(FGOALS g).The parameterizations of physical and dynamical processes of the at- mospheric component in the fast version are identical to the standard version,although some parameter values are different.However,by virtue of reduced horizontal resolution and increased time-step of the most time-consuming atmospheric component,it runs faster by a factor of 3 and can serve as a useful tool for long- term and large-ensemble integrations.A 1000-year control simulation of the present-day climate has been completed without flux adjustments.The final 600 years of this simulation has virtually no trends in global mean sea surface temperatures and is recommended for internal variability studies.Several aspects of the control simulation’s mean climate and variability are evaluated against the observational or reanalysis data. The strengths and weaknesses of the control simulation are evaluated.The mean atmospheric circulation is well simulated,except in high latitudes.The Asian-Australian monsoonal meridional cell shows realistic features,however,an artificial rainfall center is located to the eastern periphery of the Tibetan Plateau persists throughout the year.The mean bias of SST resembles that of the standard version,appearing as a"double ITCZ"(Inter-Tropical Convergence Zone)associated with a westward extension of the equatorial eastern Pacific cold tongue.The sea ice extent is acceptable but has a higher concentration.The strength of Atlantic meridional overturning is 27.5 Sv.Evidence from the 600-year simulation suggests a modulation of internal variability on ENSO frequency,since both regular and irregular oscillations of ENSO are found during the different time periods of the long-term simulation. 相似文献
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大气环流模式和耦合模式模拟的降水-海温关系之比较 总被引：9，自引：6，他引：3
本文讨论了气候系统耦合模式FGOALS_s模拟的局地降水和海温的关系, 并通过与单独大气模式SAMIL的AMIP试验结果进行对比分析, 考察了海气耦合过程对局地降水和海温关系模拟的影响。结果表明, 耦合模式FGOALS_s和单独大气模式SAMIL在模拟局地降水和海温关系上各有优势。在赤道中东太平洋地区, 观测中局地降水和海温的关系是海洋强迫为主, FGOALS_s模拟的海洋对大气的强迫比观测偏弱, 因此, SAMIL相对于FGOALS_s更有优势。在西北太平洋东部地区, 观测中夏秋季节降水和海温的关系是大气强迫为主, 由于考虑了海气相互作用过程, FGOALS_s对降水和海温关系的模拟能力要优于单独的大气模式。此外, 由于大气模式SAMIL的云参数化方案导致的模拟偏差, 在赤道中东太平洋地区 (9～11月), 降水增加时入射的短波辐射通量也是增加的, 并且这种模拟的偏差在耦合后仍然保留了下来, 导致了与观测不符的云[CD*2]辐射反馈过程。因此, 改进大气模式的云参数化方案是未来工作重点之一。此外, 分析发现耦合模式模拟的潜热通量的变化过分依赖海气湿度差。 相似文献
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该文运用LASG η坐标有限区域数值预报模式在青藏高原东部的川、渝两省市进行了定量、定点降水预报的数值模拟敏感性研究和准业务化试验, 并根据中国气象局的有关规定对结果进行了评估。经过对比分析发现:低纬度的天气系统与其活动特性, 对该地区定量、定点降水数值预报有着重要影响; 同样的物理过程和地形影响处理方式在不同的天气过程中对降水量的影响有显著差异; 可选用适当的客观分析方法, 通过强调距格点最近的站点的影响来尽量保持高、低值系统的极值, 从而改进预报效果。准业务化试验结果表明:LASG η坐标模式以其比较完善的动力框架和物理过程处理方法在这个地形复杂、天气系统多变的区域内可获得较好的预报结果, 特别是晴雨预报可获得较高的TS评分, 并能对某些客观预报难度较大的天气过程做出较好的预报。 相似文献
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Reducing the prediction uncertainties of high-impact weather and climate events: An overview of studies at LASG 
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下载免费PDF全文 This paper summarizes recent progress at the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences in studies on targeted observations, data assimilation, and ensemble prediction, which are three effective strategies to reduce the prediction uncertainties and improve the forecast skill of weather and climate events. Considering the limitations of traditional targeted observation approaches, LASG researchers have developed a conditional nonlinear optimal perturbation-based targeted observation strategy to optimize the design of the observing network. This strategy has been employed to identify sensitive areas for targeted observations of the El Niño–Southern Oscillation, Indian Ocean dipole, and tropical cyclones, and has been demonstrated to be effective in improving the forecast skill of these events. To assimilate the targeted observations into the initial state of a numerical model, a dimension-reducedprojection- based four-dimensional variational data assimilation (DRP-4DVar) approach has been proposed and is used operationally to supply accurate initial conditions in numerical forecasts. The performance of DRP-4DVar is good, and its computational cost is much lower than the standard 4DVar approach. Besides, ensemble prediction, which is a practical approach to generate probabilistic forecasts of the future state of a particular system, can be used to reduce the prediction uncertainties of single forecasts by taking the ensemble mean of forecast members. In this field, LASG researchers have proposed an ensemble forecast method that uses nonlinear local Lyapunov vectors (NLLVs) to yield ensemble initial perturbations. Its application in simple models has shown that NLLVs are more useful than bred vectors and singular vectors in improving the skill of the ensemble forecast. Therefore, NLLVs represent a candidate for possible development as an ensemble method in operational forecasts. Despite the considerable efforts made towards developing these methods to reduce prediction uncertainties, much challenging but highly important work remains in terms of improving the methods to further increase the skill in forecasting such weather and climate events. 相似文献
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The Annual Modes of Tropical Precipitation Simulated by the LASG/IAP Coupled Ocean-Atmosphere Model FGOALS_s1.1 总被引：2，自引：0，他引：2 下载免费PDF全文
下载免费PDF全文 This paper evaluates the performance of a coupled general circulation model FGOALS_s1.1 developed by LASG/IAP in simulating the annual modes of tropical precipitation.To understand the impacts of air-sea coupling on the annual modes,the result of an off-line simulation of the atmospheric component of FGOALS_s1.1,i.e.,LASG/IAP atmospheric general circulation model SAMIL,is also analyzed.FGOALS_s1.1 can reasonably reproduce major characteristics of the annual mean precipitation.Nonetheless,the coupled model shows overestimation of precipitation over the equatorial Pacific and tropical South Pacific,and underestimation of precipitation over the northern equatorial Pacific.The monsoon mode simulated by FGOALS_s1.1 shows an equatorial anti-symmetric structure,which is consistent with the observation.The bias of the coupled model in simulating monsoon mode resembles that of SAMIL,especially over the subtropics.The main deficiency of FGOALS_s1.1 is its failure in simulating the spring-fall asymmetric mode.This is attributed to the false phase of sea surface temperature anomaly (SSTA) annual cycleover the equatorial central-castern Pacific and Indian Ocean,which leads to the bias of the Walker circulation over the equatorial Pacific and the anti-Walker circulation over the Indian Ocean in boreal spring and fall.In addition,the domains of the western North Pacific monsoon and Indian monsoon simulated by the coupled model are smaller than the observation.The study suggests that the bias of the fully coupled oceanatmosphere model can only be partly attributed to the bias of the atmospheric component.The performance of FGOALS-s1.1 in simulating the annual cycle of equatorial SST deserves further improvement. 相似文献