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Search Results: 1 - 10 of 304619 matches for " general circulation<br>东亚冬季风 "
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The Interdecadal Variation of Winter Temperature in China and Its Relation to the Anomalies in Atmospheric General Circulation


气候与环境研究 , 2006,
Abstract: By using the monthly temperature in 160 stations of China and the NCEP/NCAR reanalysis data,the winter(November to March) temperature variations from 1951 to 2000 are studied with the empirical orthogonal function(EOF) analysis.The first EOF has an identical signal in whole China and demonstrates that the winter temperature has increased since the middle of 1970s in China.The second EOF has a seesaw pattern between southern and northern China and shows a warming in the 1980s and 1990s in Northwest China and Northeast China.The interdecadal variation with periods longer than 8 years can also be revealed using Fourier harmonics analysis.In addition,the warming superimposition of EOF1 and EOF2 probably causes persistent warming winter in China from the 1980s.This significant warming may intensify the drought in North China,since there are no obvious changes in the regional precipitation.The linear regressions of the atmospheric general circulation upon the winter temperature on interdecadal time scales indicate that the first EOF of temperature is significantly correlated to the Arctic Oscillation(AO),with a quasi-barotropic annular mode in the geopotential height field.However,the second EOF of temperature is closely associated with height anomalies of wavenumber one in middle-high latitudes,with a quasi-barotropic out-of-phase oscillation between the Pacific Ocean and the Atlantic Ocean.The results show that the interdecadal variations of winter temperature in China are closely related to the basic flows and perturbations in the atmosphere.The possible mechanisms of the atmospheric general circulation influencing the winter temperature in China are discussed and the questions needed to be further studied are presented.
The Effects of Eurasian Snow Cover Anomaly on Winter Atmospheric General Circulation Part I. Observational Studies
欧亚积雪异常分布对冬季大气环流的影响I. 观测研究

Chen Haishan,Sun Zhaobo,

大气科学 , 2003,
Abstract: 利用ECMWF 1979~1993年2.5°×2.5°的网格点积雪深度资料、中国气象局整编的海平面气压、500 hPa高度场和NCEP再分析资料,探讨了欧亚冬季积雪异常对同期大气环流的影响.结果表明:(1) 欧亚中高纬冬季积雪面积与同期大气环流具有密切的联系:积雪面积为正(负)异常时,冬季500 hPa高度场对应正(负)欧亚-太平洋(简称EUP)遥相关型,东亚冬季风活动偏强(弱).(2)诊断结果表明,积雪异常与大气环流之间的密切联系在一定程度上反映了冬季积雪的异常分布可能对大气EUP遥相关型和东亚冬季风活动产生影响.(3)SVD分析得到的冬季积雪的异常分布与同期大气环流的耦合模态,证实了前面所得结果.

Wang Huijun,Jiang Dabang,

第四纪研究 , 2004,
Abstract: 文章提出了一个新的东亚冬季风强度指数 ,并以此为依据从 1 94 8~ 1 999年中挑选出两组强弱冬季风年份 ,通过合成分析对大气环流场和海表温度场在强弱东亚冬季风年的差异进行了对比分析。结果表明 :东亚冬季风强度变化不单纯受局地气候系统影响 ,而与北半球半球尺度上的大气环流异常紧密相连。相对于弱的情形 ,强东亚冬季风年份中国大陆中东部及其东部大部分海域在整个对流层盛行偏北风距平、乌拉尔阻高显著加强、欧洲大陆西部维持一个深厚的气旋性异常环流系统、西风带环流偏弱、2 0 0hPa层南亚高压偏弱 ;中国大陆、北极地区、蒙古国大部分地区、欧洲大陆西北部表面温度降低 ;我国大陆与北太平洋海平面气压差加大 ;东亚大槽加强。研究还揭示 ,强东亚冬季风年份对应于北大西洋涛动弱指数 ,北大西洋和北太平洋海温状况对同期东亚冬季风强弱有着显著的影响
Eastern Asian Winter Monsoon Anomaly and Variation of Global CirculationPart. I: A Comparison Study on Strong and Weak Winter Monsoon
东亚冬季风异常与全球大气环流变化 I. 强弱冬季风影响的对比研究

Chen Jun,Sun Shuqing,

大气科学 , 1999,
Abstract: By using the ECMWF data, a strong winter monsoon year (1986) and a weak one (1980) are chosen for case study, and their difference of many characteristics both on the local and global circulations is compared The main results are as follows The East Asian Winter Monsoon is an important component of the global circulation and its anomaly is relevant to the variation of global circulation especially to the tropical circulations Winter monsoon anomaly not only results in the difference of the circulation in winter, but also affects the circulation and weather in the following seasons Most important is the persistence of the anomalous circulation and the characteristics caused by the anomalous winter monsoon over tropical region, including the convection, Hadley and Walker cells, which maintains from winter to summer
Interannual Variations of Winter Temperature in China and Their Relationship with the Atmospheric Circulation and Sea Surface Temperature

KANG Lihu,CHEN Wen,WANG Lin,CHEN Lijuan,

气候与环境研究 , 2009,
Abstract: By using the monthly mean temperature in 160 stations of China, the interannual component of winter mean (November to March of the next year) temperature in China, whose period is shorter than eight years, is studied with the empirical orthogonal function (EOF) analysis for the period 1951/1952-1999/2000. Two distinguished modes are clarified, with the first EOF mode depicting a pan-China temperature variation and the second EOF mode describing a temperature oscillation between northern and southern parts o...
Diagnosis of Factors of Influence on Onset over the South China Sea Summer Monsoon

Chen Jun,Jin Zuhui,

气候与环境研究 , 2001,
Abstract: The diagnosis of circulations, snow depths, SST, and many other factors over the eastern Asia and the tropics during the winters and springs of the years when the summer monsoon over the South China Sea burst earlier or later show a good relationship between the anomalous onset time of summer monsoon and the previous patterns of circulations anomalies. In the years when the summer monsoon bursts early, the previous patterns are characterized by stronger East Asian winter monsoon, reduced snow over the Tibetan Plateau, more active convections and enhanced heat sources over the Maritime Continent, La Nina-like SSTA, and vice versa when the summer monsoon bursts late. Thus, the onset trend of summer monsoon in 1998 is predicted by using the previous data of the factor as mentioned above. And the results is consistent with the observations.
Performances of SAMIL on the Global Heating and the East Asian Summer Monsoon

WANG Jun,BAO Qing,LIU Yimin,WU Guoxiong,HE Bian,WANG Xiaocong,

大气科学 , 2012,
Abstract: The monsoon has great impacts on the regional and global climate to which many scientists dedicate themselves for better understanding it theoretically and numerically. Based on Thermal Adaptation Theory, the authors evaluate the performances on the global diabatic heating of the newest spectral atmospheric general circulation model (SAMIL, hereafter), developed at the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences (LASG/IAP), and further make some analyses and explanations on the simulations of the components of the East Asian Summer Monsoon (EASM). The results show that SAMIL has good performances on the quadruplet heating pattern (LOSECOD) in the boreal subtropics compared to the NCEP/DOE AMIP-II Reanalysis (Reanalysis-2), except for biases in strength. The sensible heating simulated by SAMIL is universally stronger over the continent, and the condensation heating is stronger on the two sides of the Indian peninsula and over the western Pacific (especially at 10°N and 10°S), whereas it is weaker near the equator and over the regions of the Indo-China Peninsula and the South China Sea. The authors further point out that the South Asia high can be well simulated and main features of the subtropical high over the western Pacific can be generally captured. But the subtropical high has stronger strength and more westward location, which are mainly caused by the stronger latent heating over the western Pacific (near 30°N). It also can exhibit the two centers of the westerly jet which is some 10 m/s smaller than that from Reanalysis-2 resulting from the weaker latent heat, sensible heat, and shortwave radiation. It further points out that the cloud parameterization and cumulus convective parameterization cause the biases in the sensible heating and latent heating. From this point, modifying and updating the physical parameterizations in SAMIL will be the priority in the near future.
A Study of the Statistical Prediction Method for the East Asian Winter Monsoon Intensity

LIU Shi,Bueh Cholaw,TAO Shiyan and,

大气科学 , 2010,
Abstract: With the analysis of the precursory signal observed in the key regions of the air-sea system, this study has developed a statistical prediction method for the East Asian winter monsoon (EAWM) intensity, by using the monthly data of the NCEP reanalysis and NOAA extended reconstructed sea surface temperature (SST). The EAWM intensity is closely associated with the prior September-October SST anomalies in the Kuroshio and its extension region and the tropical western Indian Ocean. A strong EAWM activity corres...
An Integrated East Asian Winter Monsoon Index and Its Interannual Variability

HE Shengping,WANG Huijun,

大气科学 , 2012,
Abstract: The collaborative relationship among members of the East Asian winter monsoon (EAWM) system is first examined through the multivariate EOF (MV-EOF). Univariate EOF is then used to define the intensity index of each single system. Based on the above analyses, an integrated index of the East Asian winter monsoon (EAWMII) is defined. The new index exhibits distinct interannual variability and takes into account variations of Siberian high, East Asian trough, and meridional shear of upper-tropospheric zonal wind. Results show that the EAWMII can capture well the continuous weakening of the EAWM since the mid-1980s. It is also statistically significantly correlated with variations of both atmospheric circulation fields and surface temperature during winter. In addition, the EAWMII is closely related to the Arctic Oscillation (AO) index, the Nio3.4 sea surface temperature index, and the North Pacific Oscillation (NPO) index. The impact of AO on the East Asian surface temperature primarily occurs in the middle and high latitudes of Eurasia, Northeast China, and North Japan, etc. The influence of NPO is mainly registered in South China, East China, North Korea, South Korea, and South Japan. It is very likely that the AO affects the EAWM via the NPO.
Climatic and Environmental Background for the Anomalous Spring Sandstorms over the Northern China During 2003

Lin Zhaohui,Chen Hong,Zhang Shihuang,Xu Xinkui,

气候与环境研究 , 2004,
Abstract: General characteristics of the anomalous spring sandstorms for 2003 have been analyzed in this paper, and it is found that the spring sandstorm for 2003 is generally less in number and weaker in intensity. By using NCEP reanalysis data and station observational data, the climatic and environmental background which may be responsible for the weak spring sandstorm activities for 2003 has been investigated. Preliminary results show that, due to the weakening of the East Asian trough during 2002/2003 winter, the East Asian winter monsoon also weakens, which may lead to the decreased activities of cold air, and then the less than normal sandstorm activities. Meanwhile, the precipitation over most part of the northern China is more than normal during the spring of 2003, and the snow coverage over several source regions for sandstorm (such as the Inner Mongolia) is also more than normal, all these will lead to the late melting of surface snow cover, the late thawing of frozen soil and the increase of surface soil moisture, and hence suppress the formation of sandstorm activities during springtime in certain extent. Comparative analysis of leaf area index (LAI) by using the remote sensing data suggests that, the weaker spring sandstorm activities for 2003 could not be ascribed to the anomalies in the surface vegetation cover during the spring of 2003.
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