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Modelling the January and July Climate of 9000 Years before Present 被引量:3
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作者 王会军 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 1994年第3期319-326,共8页
The January and July climate of 9000 years before present was simulated through a set of perpetual experimentsby means of the newly designed 9 Level Atmospheric General Circulation Model (AGCM) in the institute of Atm... The January and July climate of 9000 years before present was simulated through a set of perpetual experimentsby means of the newly designed 9 Level Atmospheric General Circulation Model (AGCM) in the institute of Atmospheric Physics (IAP). The results were analysed and compared with previous results simulated by the IAP 2Level AGCM. There exists good agreement between them. It is found that the temperature is higher in July and lower inJanuary in 9000 yBP than that at present. The temperature difference is more obvious in the Northern Hemispherethan in the Southern Hemisphere and greater in July than in January. These results prove the potential abilities of theg-L AGCM in the climate simulation and climate prediction. 展开更多
关键词 PALEOclimate Modelling. climate Change Atmospheric general circulation Models
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The African Climate as Predicted by the IAP Grid-Point Nine-Layer Atmospheric General Circulation Model (IAP-9L-AGCM) 被引量:1
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《Advances in Atmospheric Sciences》 SCIE CAS CSCD 1997年第3期122-129,共8页
TheAfricanClimateasPredictedbytheIAPGrid-PointNine-LayerAtmosphericGeneralCirculationModel(IAP-9L-AGCM)Chine... TheAfricanClimateasPredictedbytheIAPGrid-PointNine-LayerAtmosphericGeneralCirculationModel(IAP-9L-AGCM)ChinekeTheoChidiezie①,... 展开更多
关键词 IAP-9L-AGCM Grid The African climate as Predicted by the IAP Grid-Point Nine-Layer Atmospheric general circulation Model
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Quantifying major sources of uncertainty in projecting the impact of climate change on wheat grain yield in dryland environments
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作者 Reza DEIHIMFARD Sajjad RAHIMI-MOGHADDAM +1 位作者 Farshid JAVANSHIR Alireza PAZOKI 《Journal of Arid Land》 SCIE CSCD 2023年第5期545-561,共17页
Modelling the impact of climate change on cropping systems is crucial to support policy-making for farmers and stakeholders.Nevertheless,there exists inherent uncertainty in such cases.General Circulation Models(GCMs)... Modelling the impact of climate change on cropping systems is crucial to support policy-making for farmers and stakeholders.Nevertheless,there exists inherent uncertainty in such cases.General Circulation Models(GCMs)and future climate change scenarios(different Representative Concentration Pathways(RCPs)in different future time periods)are among the major sources of uncertainty in projecting the impact of climate change on crop grain yield.This study quantified the different sources of uncertainty associated with future climate change impact on wheat grain yield in dryland environments(Shiraz,Hamedan,Sanandaj,Kermanshah and Khorramabad)in eastern and southern Iran.These five representative locations can be categorized into three climate classes:arid cold(Shiraz),semi-arid cold(Hamedan and Sanandaj)and semi-arid cool(Kermanshah and Khorramabad).Accordingly,the downscaled daily outputs of 29 GCMs under two RCPs(RCP4.5 and RCP8.5)in the near future(2030s),middle future(2050s)and far future(2080s)were used as inputs for the Agricultural Production Systems sIMulator(APSIM)-wheat model.Analysis of variance(ANOVA)was employed to quantify the sources of uncertainty in projecting the impact of climate change on wheat grain yield.Years from 1980 to 2009 were regarded as the baseline period.The projection results indicated that wheat grain yield was expected to increase by 12.30%,17.10%,and 17.70%in the near future(2030s),middle future(2050s)and far future(2080s),respectively.The increases differed under different RCPs in different future time periods,ranging from 11.70%(under RCP4.5 in the 2030s)to 20.20%(under RCP8.5 in the 2080s)by averaging all GCMs and locations,implying that future wheat grain yield depended largely upon the rising CO2 concentrations.ANOVA results revealed that more than 97.22% of the variance in future wheat grain yield was explained by locations,followed by scenarios,GCMs,and their interactions.Specifically,at the semi-arid climate locations(Hamedan,Sanandaj,Kermanshah and Khorramabad),most of the variations arose from the scenarios(77.25%),while at the arid climate location(Shiraz),GCMs(54.00%)accounted for the greatest variation.Overall,the ensemble use of a wide range of GCMs should be given priority to narrow the uncertainty when projecting wheat grain yield under changing climate conditions,particularly in dryland environments characterized by large fluctuations in rainfall and temperature.Moreover,the current research suggested some GCMs(e.g.,the IPSL-CM5B-LR,CCSM4,and BNU-ESM)that made moderate effects in projecting the impact of climate change on wheat grain yield to be used to project future climate conditions in similar environments worldwide. 展开更多
关键词 wheat grain yield climate change Agricultural Production Systems sIMulator(APSIM)-wheat model general circulation Models(GCMs) arid climate semi-arid climate Iran
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Effects of Climatic Change on Evapotranspiration in Zhalong Wetland,Northeast China 被引量:5
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作者 WANG Hao XU Shiguo SUN Leshi 《Chinese Geographical Science》 SCIE CSCD 2006年第3期265-269,共5页
Evapotranspiration (ET) process of plants is controlled by several factors. Besides the physiological factors of plants, height, density, LAI (leaf area index), etc., the change of meteorological factors, such as ... Evapotranspiration (ET) process of plants is controlled by several factors. Besides the physiological factors of plants, height, density, LAI (leaf area index), etc., the change of meteorological factors, such as radiation, temperature, wind and precipitation, can influence ET process evidently, thus remodeling the spatial and temporal distribution of ET. In order to illuminate the effects of meteorological factors on wetland ET, the ET of Zhalong Wetland was calculated from 1961 to 2000, the statistical relationships (models) between ET and maximum temperature (Tmax), minimum temperature (Tmin), precipitation (P) and wind speed at 2m height (U2) were established, and the sensitivity analysis of the variables in the model was performed. The results show that Tmax and Tmin are two dominating factors that influence ET markedly, and the difference of rising rate between Tmax and Tmin determines the change trend of ET. With the climatic scenarios of four General Circulation Models (GCMs), the ET from 2001 to 2060 was predicted by the statistical model. Compared to the period of 1961-2000, the water consumption by ET will increase greatly in the future. According to the scenarios, the rise of Tmax (about 1.5℃ to 3.3℃) and Tmin (about 1.7℃ to 3.5℃) will cause an additional water consumotion of 14.0%- 17.8% for reed swami). The ecological water demand in Zhalong Wetland will become more severe. 展开更多
关键词 climate change EVAPOTRANSPIRATION general circulation Model Zhalong Wetland
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Effects of Nested Area Size upon Regional Climate Model Simulations 被引量:3
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作者 刘华强 钱永甫 郑益群 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2002年第1期111-120,共10页
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... 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 superior 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 P&#963;RCM 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 P&#963;RCM nesting upon a GCM reaches more realistic results compared to a single GCM used. 展开更多
关键词 Regional climate model Atmospheric general circulation model NESTING
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Application of the Bottom-up Method on Risk Evaluation of Climate Change in Water Resources System
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作者 李科 齐晶瑶 +1 位作者 BROWN Casey 王灵芝 《Journal of Donghua University(English Edition)》 EI CAS 2015年第5期851-854,共4页
Traditional approach to evaluate the impacts of climate change on the water resources systems always begins with downscaling general circulation models( GCMs) and proceeding back to the hydrological model. This approa... Traditional approach to evaluate the impacts of climate change on the water resources systems always begins with downscaling general circulation models( GCMs) and proceeding back to the hydrological model. This approach has some distinct disadvantages: 1) GCM must be downscaled; 2) different GCMs are difficult to be reconciled for a given climate change scenario;3) the uncertainty of GCMs is far from the requirement of the evaluation of climate change impacts. To overcome these limits of the traditional method,a new method termed as "bottom-up"was used for climate risk assessment that linked vulnerability assessment with climate information to assess the risk of climate change impacts on the Quabbin Reservoir,and United States under A2 scenario.The result shows that the risks are around 20% in 2006-2035 and 2036-2055,50% in 2066-2095. 展开更多
关键词 climate change water resources systems general circulation models(GCMs) RISK bottom-up method
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A two-layer simple baroclinic equation ocean model and its simulations of ocean currents in winter and summer
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《Acta Oceanologica Sinica》 SCIE CAS CSCD 1999年第2期279-291,共13页
关键词 Ocean general circulation model numerical simulations short term climate simulations
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Circulation background of climate patterns in the past millennium: Uncertainty analysis and re-reconstruction of ENSO-like state 被引量:16
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作者 TAN Ming 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第6期1225-1241,共17页
The question of whether or not global warming has paused since more than ten years ago, namely "warming hia- tus", has attracted the attention of climate science community including the IPCC. Some authors have attri... The question of whether or not global warming has paused since more than ten years ago, namely "warming hia- tus", has attracted the attention of climate science community including the IPCC. Some authors have attributed the "warming hiatus" to the internal changes in the climate system, i.e., the recombination of ocean-atmosphere circulations. Therefore, it is necessary to propose higher requirements on reconstructing circulation background of climate change for the past millennium. However, the analyses of changes in atmospheric circulation over the last millennium as well as the conclusions of related re- gional climate patterns are so widely different and contradictory, bringing uncertainties to our understanding of regional even global climate change to a great extent. On the other hand, in the last 10 years the high-precision U/Th-dated stalagmite oxygen isotope ratio (δ^18O) sequences provided an accurate chronological frame for the paleoclimate study of the middle and late Pleistocene, in which all authors from China took the Chinese stalagmite δ^18O as the summer monsoon index without excep- tion. However, this point of view misleads the climate scientists into thinking that the stalagmite δ^18O can be as the proxy of precipitation amount. Nevertheless, it is well known that all of these records have a lot in common in the low frequency trend. However, most sequences cannot be calibrated by instrumental precipitation records, and thus the uncertainty of the climate research framework of China and even of the world has increased. Therefore, it is imperative for climatology to clarify the origin of contradiction and to reduce the uncertainty as early as possible. On the basis of analyzing the significance of stalag- mite ~180 in the monsoon regions of China, the author tries to propose a new circulation proxy in this paper: integrating the Chinese stalagmite oxygen isotope sequence to reconstruct the tropical Pacific sea surface temperature gradient, i.e., the large-scale ENSO-like state over the past millennium. Furthermore, the author speculates that it was warm in the modern times and the Medieval Period, but the circulation recombination was different in both periods. And this inference could be support- ed by the longer record since Last Glacial Maximum. In other words, the attribution analysis of the identical low-frequency trends of Chinese stalagmite t^180 on a large scale shows that the ENSO-like state controls the climate change in the monsoon regions of China at different time scales (from interannual to century or even longer time scales). Wherein the important connection of circulations is the western Pacific subtropical high (WPSH), that is to say, besides the interannual and decadal time scales, the WPSH would possess the circulation mode on longer timescales. For example, we may discuss the change of the WPSH in the whole Holocene epoch, i.e., the half precession period. These discussions could make sense to the study of not only the paleoclimate but also the modern climate. 展开更多
关键词 The past millennium ENSO circulation background climate pattern WPSH Stalagmite δ^18O circulation recombination
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Impact of Tibetan Plateau surface heating field intensity on Northern Hemispherical general circulations and weather and the climate of China 被引量:6
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作者 李栋梁 季国良 吕兰芝 《Science China Earth Sciences》 SCIE EI CAS 2001年第S1期390-399,共10页
The basic climatic characteristics about the Tibetan Plateau surface heating field intensity (TPSHFI) and its anomalous change trend are analyzed by using Lhasa, Yushu and Wu-daoliang as the representatves of north-pa... The basic climatic characteristics about the Tibetan Plateau surface heating field intensity (TPSHFI) and its anomalous change trend are analyzed by using Lhasa, Yushu and Wu-daoliang as the representatves of north-part, east-part and mid-north part of the Tibetan Plateau, respectively. The impact of heating intensity anomalism on NH general circulation and the climate of China is diagnosed. 展开更多
关键词 : Tibetan Plateau HEATING field intensity general circulation on the NORTHERN HEMISPHERE WEATHER and climate anomaly impact.
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MM5 Simulations of the China Regional Climate During the LGM.Ⅱ:Influence of Change of Land Area,Vegetation,and Large-scale Circulation Background 被引量:3
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作者 刘煜 何金海 +1 位作者 李维亮 陈隆勋 《Acta meteorologica Sinica》 SCIE 2008年第1期22-30,共9页
Using a regional climate model MM5 nested to an atmospheric global climate model CCM3, a series of simulations and sensitivity experiments have been performed to investigate the relative LGM climate response to change... Using a regional climate model MM5 nested to an atmospheric global climate model CCM3, a series of simulations and sensitivity experiments have been performed to investigate the relative LGM climate response to changes of land-sea distribution, vegetation, and large-scale circulation background over China. Model results show that compared with the present climate, the fluctuations of sea-land distribution in eastern Asia during the LGM result in the temperature decrease in winter and increase in summer. It has significant impact on the temperature and precipitation in the east coastal region of China. The impact on precipitation in the east coastal region of China is the most significant one, with 25%-50% decrease in the total precipitation change during the LGM. On the other hand, the changes in sea-land distribution have less influence on the climate of inland and western part of China. During the LGM, significant changes in vegetation result in temperature alternating with winter increase and summer decrease, but differences in the annual mean temperature are minor. During the LGM, the global climate, i.e., the large-scale circulation background has changed significantly. These changes have significant influences on temperature and precipitation over China. They result in considerable temperature decreases in this area, and direct the primary patterns and characteristics of temperature changes. Results display that, northeastern China has the greatest temperature decrease, and the temperature decrease in the Tibetan Plateau is larger than in the eastern part of China located at the same latitude. Moreover, the change of large-scale circulation background also controls the pattern of precipitation change. Results also show that, most of the changes in precipitation over western and northeastern parts of China are the consequences of changing large-scale circulation background, of which 50%-75% of precipitation changes over northern and eastern China are the results of changes in large-scale circulation background. Over China, the LGM climate responses to different mechanisms in order of strength from strong to weak are, the large-scale circulation pattern, sea- land distribution, vegetation, CO2 concentration, and earth orbital parameters. 展开更多
关键词 sea-land distribution VEGETATION large-scale circulation background LGM China regional climate
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CONTEMPORARY CLIMATIC CHANGE OVER THE QINGHAI-XIZANG PLATEAU AND ITS RESPONSE TO THE GREEN-HOUSE EFFECT 被引量:1
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作者 刘晓东 张敏锋 《Chinese Geographical Science》 SCIE CSCD 1998年第4期2-11,共0页
The knowledge of contemporary climatic change over the Qinghai Xizang (Tibet) Plateau (QXP) has been inadequate for a long time due to lack of enough observational data. In this paper, on the basis of monthly tempera... The knowledge of contemporary climatic change over the Qinghai Xizang (Tibet) Plateau (QXP) has been inadequate for a long time due to lack of enough observational data. In this paper, on the basis of monthly temperature and precipitation data in 1961-1990 from 48 stations on the QXP, the temperature data are extended backward to 1901 with an empirical orthogonal function (EOF) method, microscopic characteristics of contemporary climatic change over the QXP are analyzed, and the response of the plateau climate to global warming is discussed in combination with atmospheric general circulation model (GCM) outputs. The results show that the plateau climate, as a whole, has been warming since the early part of this century, that the precipitation has generally been increasing during the recent 30 years, and that these climatic trends seem to be related to the enhanced green house effect induced by increasing CO 2 concentration in the atmosphere. 展开更多
关键词 Qinghai Xizang PLATEAU CONTEMPORARY CLIMATIC CHANGE green house EFFECT empirical orthogonal function atmospheric general circulation CO 2
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Simulations of the Tropical Intraseasonal Oscillation by the Atmospheric General Circulation Model of the Beijing Climate Center
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作者 董敏 吴统文 +1 位作者 王在志 张芳 《Acta meteorologica Sinica》 SCIE 2010年第5期571-583,共13页
The performance of BCC (Beijing Climate Center) AGCM 2.0.1 (Atmospheric General Circulation Model version 2.0.1) in simulating the tropical intraseasonal oscillation (TIO) is examined in this paper.The simulatio... The performance of BCC (Beijing Climate Center) AGCM 2.0.1 (Atmospheric General Circulation Model version 2.0.1) in simulating the tropical intraseasonal oscillation (TIO) is examined in this paper.The simulations are validated against observation and compared with the NCAR CAM3 (Community Atmosphere Model version 3) results.The BCC AGCM2.0.1 is developed based on the original BCC AGCM (version 1) and NCAR CAM3.New reference atmosphere and reference pressure are introduced into the model.Therefore,the original prognostic variables of temperature and surface pressure become their departures from the reference atmosphere.A new Zhang-McFarlane convective parameterization scheme is incorporated into the model with a few modifications.Other modifications include those in the boundary layer process and snow cover calculation.All simulations are run for 52 yr from 1949 to 2001 under the lower boundary conditions of observed monthly SST.The TIOs from the model are analyzed.The comparison shows that the NCAR CAM3 has a poor ability in simulating the TIO.The simulated strength of the TIO is very weak.The energy of the eastward moving waves is similar to that of the westward moving waves in CAM3.While in observation the former is much larger than the latter.The seasonal variation and spatial distribution of the TIO produced by CAM3 are also much different from the observation.The ability of the BCC AGCM2.0.1 in simulating the TIO is significantly better.The simulated TIO is evident.The strength of the TIO produced by the BCC AGCM2.0.1 is close to the observation.The energy of eastward moving.waves is much stronger than that of the westward moving waves,which is consistent with the observation.There is no significant difference in the seasonal variation and spatial distribution of the TIO between the BCC model simulation and the observation.In general,the BCC model performs better than CAM3 in simulating the TIO. 展开更多
关键词 Beijing climate Center (BCC) atmospheric general circulation model (AGCM) tropical intraseasonal oscillation (TIO) simulation study
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An Overview of BCC Climate System Model Development and Application for Climate Change Studies 被引量:39
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作者 吴统文 宋连春 +24 位作者 李伟平 王在志 张华 辛晓歌 张艳武 张莉 李江龙 吴方华 刘一鸣 张芳 史学丽 储敏 张洁 房永杰 汪方 路屹雄 刘向文 魏敏 刘茜霞 周文艳 董敏 赵其庚 季劲钧 Laurent LI 周明煜 《Journal of Meteorological Research》 SCIE 2014年第1期34-56,共23页
This paper reviews recent progress in the development of the Beijing Climate Center Climate System Model (BCC_CSM) and its four component models (atmosphere, land surface, ocean, and sea ice). Two recent versions ... This paper reviews recent progress in the development of the Beijing Climate Center Climate System Model (BCC_CSM) and its four component models (atmosphere, land surface, ocean, and sea ice). Two recent versions are described: BCC_CSMI.1 with coarse resolution (approximately 2.8125°× 2.8125°) and BCC_CSMI.I(m) with moderate resolution (approximately 1.125°×1.125°). Both versions are fully cou- pled climate-carbon cycle models that simulate the global terrestrial and oceanic carbon cycles and include dynamic vegetation. Both models well simulate the concentration and temporal evolution of atmospheric CO2 during the 20th century with anthropogenic CO2 emissions prescribed. Simulations using these two versions of the BCC_CSM model have been contributed to the Coupled Model Intercomparison Project phase five (CMIP5) in support of the Intergovernmental Panel on Climate Change (1PCC) Fifth Assessment Report (AR5). These simulations are available for use by both national and international communities for investigating global climate change and for future climate projections. Simulations of the 20th century climate using BCC-CSMI.1 and BCC_CSMI.I(m) are presented and validated, with particular focus on the spatial pattern and seasonal evolution of precipitation and surface air temperature on global and continental scales. Simulations of climate during the last millennium and projections of climate change during the next century are also presented and discussed. Both BCC_CSMI.1 and BCC_CSMI.I(m) perform well when compared with other CMIP5 models. Preliminary analyses in- dicate that the higher resolution in BCC CSMI.I(m) improves the simulation of mean climate relative to BCC_CSMI.1, particularly on regional scales. 展开更多
关键词 Beijing climate Center climate System Model (BCC_ CSM) atmospheric general circulationmodel land surface model oceanic general circulation model sea ice model
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NUMERICAL EXPERIMENTS FOR THE IMPACT OF ANTARCTIC ICE COVER AND SEA SURFACE TEMPERATURE ON CLIMATE VARIABILITY 被引量:4
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作者 缪群 陈隆勋 《Acta meteorologica Sinica》 SCIE 1997年第1期23-34,共12页
By using a three-level atmospheric general circulation model (AGCM),we have completed several numerical experiments to study the impacts of sea surface temperature anomaly (SSTA) and antarctic ice cover anomaly (AICA)... By using a three-level atmospheric general circulation model (AGCM),we have completed several numerical experiments to study the impacts of sea surface temperature anomaly (SSTA) and antarctic ice cover anomaly (AICA) during 1981—1983 on climate variability.The results show that during the El Nino period of 1982—1983 the impact of SSTA overrides that of AICA.SSTA mainly affects equatorial zonal circulation and produces PNA wave train,and SE-NW wave train in East Asia to influence the weather of China.AICA produces west-east anomalous vortex streets in the middle latitudes of both hemispheres and affects the intensity of the polar vortex of Southern Hemisphere. 展开更多
关键词 El Nino antarctic ice cover anomaly(AICA) climate variability atmospheric general circulation model(AGCM)
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EVALUATION OF CGCM AND SIMULATION OF REGIONAL CLIMATE CHANGE IN EAST ASIA 被引量:1
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作者 李晓东 赵宗慈 +1 位作者 王绍武 丁一汇 《Acta meteorologica Sinica》 SCIE 1995年第4期385-401,共17页
In this paper,experiment results about East Asia climate from five CGCMs are described.The ability of the models to simulate present climate and the simulated response to increased carbon dioxide are both covered.The ... In this paper,experiment results about East Asia climate from five CGCMs are described.The ability of the models to simulate present climate and the simulated response to increased carbon dioxide are both covered.The results indicate that all models show substantial changes in climate when carbon dioxide concentrations are doubled.In particular,the strong surface warming at high latitudes in winter and the significant increase of summer precipitation in the monsoon area are produced by all models.Regional evaluation results show that these five CGCMs are particularly good in simulating spatial distribution of present climate.The main characteristics of the seasonal mean H500,SAT, MSLP field can be simulated by most CGCMs.But there are significant systematic errors in SAT, MSLP,HS00 fields in most models.On the whole,DKRZ OPYC is the best in simulating the present climate in East Asia. 展开更多
关键词 EVALUATION coupled atmosphere and ocean general circulation model(CGCM) transient simulation climate change
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2019年盛夏最大降水环流成因分析
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作者 石红艳 杨宁 +1 位作者 李凤毅 孙景文 《黑龙江气象》 2024年第3期5-8,共4页
利用1961-2020年黑龙江省盛夏(7-8月)降水量、NCAR/NCEP大气再分析和Nino34 SST资料,分析2019年盛夏黑龙江降水异常与ENSO事件背景下大尺度环流特征。结果表明:2019年盛夏黑龙江省降水处于多水时段,ENSO暖事件多发期降水偏多发生的概率... 利用1961-2020年黑龙江省盛夏(7-8月)降水量、NCAR/NCEP大气再分析和Nino34 SST资料,分析2019年盛夏黑龙江降水异常与ENSO事件背景下大尺度环流特征。结果表明:2019年盛夏黑龙江省降水处于多水时段,ENSO暖事件多发期降水偏多发生的概率增加。指出了2019年降水特点主要受东北冷涡与3次台风北上相互作用,发生6次重大降水过程;500 hPa高度距平场为西北-东南向呈“+、-、+”形势;西太平洋副热带高压明显偏东,脊区向北伸展有利台风北上;低纬主要有3支强南风距平气流北上进入气旋环流,为维持台风暴雨提供充足水汽;黑龙江中部和东部地区最大上升气流速度出现在600-300 hPa高度,也是台风活跃区,辐合明显,黑龙江省强降水出现在东部最大降水中心,落区位于三江平原北部鹤岗至萝北。 展开更多
关键词 2019年盛夏强降水 气候背景 冷涡与台风结合 大尺度环流成因 物理量分析
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2008年10月青藏高原东部一次区域暴雪过程及气候背景分析 被引量:51
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作者 周倩 程一帆 +3 位作者 周甘霖 王式功 尚可政 杨德保 《高原气象》 CSCD 北大核心 2011年第1期22-29,共8页
2008年10月26~28日青藏高原东部出现了一次历史罕见的强区域暴雪过程。本文利用MI-CAPS资料、T213资料和NCEP资料对此次区域暴雪过程形成的气候背景、环流形势和影响系统进行了分析,同时对其水汽条件、动力条件等物理特征也进行了分析... 2008年10月26~28日青藏高原东部出现了一次历史罕见的强区域暴雪过程。本文利用MI-CAPS资料、T213资料和NCEP资料对此次区域暴雪过程形成的气候背景、环流形势和影响系统进行了分析,同时对其水汽条件、动力条件等物理特征也进行了分析。结果表明,青藏高原东部冬半年区域暴雪过程500 hPa环流形势场可分为北涡南槽型、西太平洋副热带高压型和南北槽分支型3种类型,此次区域暴雪过程属于西太平洋副热带高压型;红外云图显示,来自孟加拉湾的热带风暴登陆北上为此次暴雪提供了充沛的水汽;物理量诊断分析表明,区域暴雪过程期间,水汽通量场、水汽通量散度场和垂直运动场都反映出该区域内有大量水汽输送和水汽辐合,上升运动较强。 展开更多
关键词 青藏高原东部 暴雪 气候背景 环流形势 物理量诊断分析
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1998年长江流域洪涝灾害的气候背景和大尺度环流条件 被引量:156
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作者 陶诗言 张庆云 张顺利 《气候与环境研究》 CSCD 1998年第4期3-12,共10页
分析1998年夏季长江中游严重洪涝灾害前期以及洪水出现期的和大尺度环流的作用。厄尔尼诺事件为这次长江流域夏季洪涝提供了气候背景。在梅雨前期江南出现7个月的多雨期,这使得梅雨开始时暴雨区的土壤水分接近饱和,江河湖的水位... 分析1998年夏季长江中游严重洪涝灾害前期以及洪水出现期的和大尺度环流的作用。厄尔尼诺事件为这次长江流域夏季洪涝提供了气候背景。在梅雨前期江南出现7个月的多雨期,这使得梅雨开始时暴雨区的土壤水分接近饱和,江河湖的水位很高。梅雨期出现强降水后,大量雨水只能涌向河流,使得江河泛滥;土壤水分饱和也使得暴雨区的水分内循环增强。研究表明:1998年梅雨期降水强度较大,这期间有来自南海南部的两次大气低频振荡,输送大量不稳定的湿空气到暴雨区。7月下旬出现二度梅以及8月长江上游出现5次洪峰都与当时西风带南部静止波列的调整有关。 展开更多
关键词 长江流域 洪涝灾害 气候背景 大尺度环流
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影响2000年热带风暴活动的环境场分析 被引量:11
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作者 何敏 宋文玲 许力 《气象》 CSCD 北大核心 2002年第4期15-20,共6页
分析了 2 0 0 0年 6~ 1 0月影响热带风暴活动的环境场特征。 2 0 0 0年处在热带风暴活动偏少的气候阶段 ,大尺度环流异常是影响热带风暴活动的主导因素 ,是造成热带风暴非活跃期生成数和登陆数偏少 ,乃至年总数偏少的主要原因。这些因... 分析了 2 0 0 0年 6~ 1 0月影响热带风暴活动的环境场特征。 2 0 0 0年处在热带风暴活动偏少的气候阶段 ,大尺度环流异常是影响热带风暴活动的主导因素 ,是造成热带风暴非活跃期生成数和登陆数偏少 ,乃至年总数偏少的主要原因。这些因子异常在 6、1 展开更多
关键词 热带风暴 环境场 气候背景 大尺度环流
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1949—2008年热带气旋在中国大陆活动的统计特征及环流背景 被引量:15
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作者 魏娜 李英 胡姝 《热带气象学报》 CSCD 北大核心 2013年第1期17-27,共11页
利用中国气象局1949—2008年热带气旋年鉴资料,对60年来西北太平洋(包括南海)热带气旋(TC)在中国大陆的登陆活动进行统计分析,包括TC登陆的频率、位置、强度、陆上维持时间、路径、移速及消亡等。结果表明:60年间共有391个TC登陆我国大... 利用中国气象局1949—2008年热带气旋年鉴资料,对60年来西北太平洋(包括南海)热带气旋(TC)在中国大陆的登陆活动进行统计分析,包括TC登陆的频率、位置、强度、陆上维持时间、路径、移速及消亡等。结果表明:60年间共有391个TC登陆我国大陆,最高袭击率出现在广东西南部和广西南部,江西和安徽则为袭击率较多的内陆地区。TC在大陆的年均登陆纬度为24.1°N,长期无明显变化,但1990年代至2006年间有偏北的趋势。登陆后强度衰减主要出现在前6 h,登陆24 h后各强度等级TC的衰减率趋于一致。TC陆上维持时间年均25 h,无明显年际变化,但2004—2008年普遍大于平均值。TC登陆时移速较慢,低于20 km/h,登陆后有所加快。TC平均移速在我国东北部最大,可达45 km/h以上。陆上TC最终34%重新入海,6%移至国外,60%在我国大陆消失(其中65%消失在沿海)。在此基础上,利用NCEP资料,对TC在我国大陆以不同路径活动及不同季节相似路径(北上转向)的环流背景进行合成分析对比。结果表明,西行、西北行、东北转向的TC环流背景的差别主要体现在副高形态和强度、西风槽的影响以及高空流型的差异上,其中东北转向TC与青藏高压以及西风槽的加强活动有密切联系。孟加拉湾低值系统的活动以及TC环流与西南风低空急流联结是三类TC的共同特征,说明季风活动、水汽通道的建立是TC在我国大陆活动的重要条件。不同季节相似路径TC的环流形势相似,但西风槽与TC的相互作用对TC陆上维持有不同影响。 展开更多
关键词 热带气旋 气候特征 环流背景 中国大陆
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