Current Issue

• The Impact of Qinghai-Xizang Plateau Uplift on Asian General Circulation in Spring and Summer
• LIANG Xiao-yun;LIU Yi-min;WU Guo-xiong
• 2005 Vol. 24 (6): 837-845. 
• Abstract ( ) PDF (1911KB) ( )
• To study the effects of the uplift of Qinghai-Xizang Plateau(QXP) on Asian atmospheric general circulation in spring and summer,the experiments with and without QXP are performed respectively(called TP-Experiment and NTP-Experiment hereafter) for 10 years using an atmospheric general circulation model with rhomboidal truncation(R42L9).Comparing the results of TP Experiment with NTP-Experiment,it is showed that the Asian atmospheric general circulation has a strong response to the uplift of QXP.The QXP split the westerlies and force them to flow around it in lower level.There are two branches of the westerlies,one flow to the north and the other to the south of the Plateau.The northern branch strengthen cold air go down southward to Eastern Asia.The intensity of southern branch enhances because of weaken heating of the QXP in spring.The enhanced southern branch transport moisture to southern China.Meeting of cold and warm air in southern China causes heavy rain in there in spring.In summer,cyclonic circulation caused by the QXP strong heating source in lower level enhances the Eastern Asia summer monsoon on the east side of QXP and make it develop northward.However,the sensible heat air pumping of QXP bring negative vorticity and divergence over southern Asia in lowew level,and decrease the precipitation in there in summer.So the southern Asia summer monsoon weakens with the uplift of QXP.Another thermal influence of the QXP is reflected in upper level.The negative vorticity sources over the Plateau generated by the QXP heating strengthen the Iran high at 200 hPa in a remote way.

• A Primary Research on the Characteristics of Wind,Temperature and Humidity in the Boundary Layer over Jinta Summer
• WEI Zhi-gang;Lü Shi-hua;HU Ze-yong;ZHANG Yu;CHEN Shi-qiang;LI Zhen-chao;AO Yin-huan;LI Suo-suo;ZHANG Yong-jun;GU Liang-lei
• 2005 Vol. 24 (6): 846-856. 
• Abstract ( ) PDF (436KB) ( )
• Using the observed data of the intensive period of Land-atmosphere interaction field experiment over Jinta Oasis from June to July 2004,the characteristics of wind,temperature and humidity in the boundary layer at noon and at night are analyzed.At night of summer,the wind is blowing westerly in upper layers over Jinta Oasis when the surface wind speed is small.The stable boundary layer depth is about from 100 m to 190 m.At noon,when the wind is blowing easterly in lower layers,the easterly jet will occur and its depth varies from 1000 m to 4000 m;The bottom of inversion LID in about from 3000 m to 3600 m in height;The inner boundary layer of oasis might occur below 500~800 m in height.At noon,when the north or northwest wind is blowing in lower layers,the westerly or northwesterly wind is blowing in upper layers;the variation of wind speed with height is smaller in lower layers;The bottom of inversion LID in about 3500 m in height.The inner boundary layer of oasis might occur below 1200 m and sometimes its height might be lower.

• Large-Eddy Simulation of Atmosphere Boundary Layer over Heterogeneous Land Surface in Oasis Area of Heihe River Basin
• JIANG Jin-hua;HU Fei;JIAO Yuan-mei
• 2005 Vol. 24 (6): 857-864. 
• Abstract ( ) PDF (549KB) ( )
• The atmosphere boundary layer over heterogeneous land surface in oasis area(Zhangye) of Heihe river basin is studied with the large-eddy simulation option of Regional Atmospheric Modeling System(RAMS) by adding highly-resolved land use type and soil texture.The simulated mean structure and second-order moments of ABL are analyzed,and the resulting temperature and relative humidity are compared with the observed data during HEIFE.The results indicate that simulated mean structure correctly exhibit the ABL diurnal variation from primary stable stratification to mixing layer developing and entrainment forming,then inversion appearing and mixing layer evolving to residual layer.The second-order moments show two peaks at surface layer and top of mixing layer respectively.However,because of the difference between the vegetation parameters in land surface model(LEAF) and ones used by simulation of Yan Yuping^[6,8] in Heihe river basin,the simulated surface sensible and latent heat flux are lower than observed in daytime,and so temperature is lower in daytime and higher at nighttime,while deviation of relative humidity is slightly large.

• Numerical Simulation of Cold Island Effect in Jinta Oasis Summer
• WEN Li-juan;Lü Shi-hua;CHEN Shi-qiang;MENG Xian-hong;BAO Yan
• 2005 Vol. 24 (6): 865-871. 
• Abstract ( ) PDF (400KB) ( )
• Using the mesoscale model MM5,the oasis effect of Jinta from 31 July to 2 Augst 2003 was simulated.Pressure on 850 hPa over the oasis was high,and it was opposite on 700 hPa.The simulated results show that the centers of the temperature,humidity and pressure fields were located on the southeast side of the oasis while the oasis was colder and wetter in the real world.These characteristics were possiblly resulted by the circulation of background field and the oasis effect.Correspondingly,the wind on low levels(850 hPa) diverged from the direction of the background wind field,extending to the vertical direction of it.The surface latent heat and sensible heat fields didn't change their forms,and were the same the oasis' shape.

• Validation of SSiB Model in Typical Arid Region of Northwest China
• ZHU De-qin;GAO Xiao-qing
• 2005 Vol. 24 (6): 872-879. 
• Abstract ( ) PDF (356KB) ( )
• The performance of the simplified Simple Biosphere model(SSiB) in arid region has been tested in a off-line simulations utilizing the field experiment at Dunhuang Gobi site in Northwest China from May 25 to June 15,2000.The results show that the model can reproduced the observed surface heat fluxes and ground surface temperature realistically when initialized and driven by the observed atmospheric forcing without precipitation.But the simulated results have great differences when there was precipitation.This study suggests that the description of the soil water process in the model is not so well in arid region.In order to use the SSiB model in typical arid region,some further improved job should be done.

• Climatological Characteristics of Water Vapor Transport over Eastern Part of Qinghai-Xizang Plateau and Its Surroundings
• ZHOU Chang-yan;LI Yue-qing;LI Wei;CHEN Long-xun
• 2005 Vol. 24 (6): 880-888. 
• Abstract ( ) PDF (2014KB) ( )
• Climatological characteristics for large scale water vapor transport over the eastern part of the Qinghai-Xizang Plateau and its surroundings are investigated based on the vertically integrated water vapor flux from 1980 to 1997.It is found that in winter and spring,themoisture of the region is mainly from the middle-latitude westerly water transport;in summer(July),the moisture comes from the Bay of Bengle and the South China Sea,and in autumn the water vapor is from the west Pacific Ocean.The advance and retreat features of the moisture with southerlies over the region are slow.And the water vapor from south,whose abnormal action will affect the occurrence of floods and droughts,can advance no thwart to 40°N in August,and retreat southward to the south of 30°N in October.The enough attention should be paid to the influence of the water vapour transport from the South China Sea and the west Pacific Ocean on this region.

• Temporal and Spatial Feature Analyses of Winter and Summer Surface Air Temperature in CMASA,Part(Ⅰ): January
• LI Wan-yuan;QIAN Zheng-an
• 2005 Vol. 24 (6): 889-897. 
• Abstract ( ) PDF (1308KB) ( )
• To analyse the temporal and spatial change features of the winter surface air temperature over China- Mongolia Arid- and Semiarid- Areas(CMASA) as a whole,the EOF and REOF analyses have been conducted utilizing the observed air temperature data from the selected even-distributed 104 stations in the area in January of 1961-1997,and their multi-year mean temperature field and standard variance one have been analysed as well.The main results are as follows:(1) Latitude,topography and Siberia cold high are three main factors affecting the winter temperature distribution in CMASA.(2) The standard variances of winter temperature in most of the area are larger than 2℃.(3) There are three temperature anomaly distribution modes: With the same anomaly in whole area,with opposite anomalies in the south and north or in the east and west according to the EOF analyses.(4) According to the REOF analyses of six subregions of the area,like one on the northeast side of the Plateau,South Xinjiang one,Qinghai Plateau one,North Xinjiang one,Mid and East Mongolia one and West-Mongolia one,were divided.(5) The winter temperature hasbeen warmed considerably by more than 2℃ since 1961,particularly near the south border and after 1977.(6) There existed 4 or 8 year periodic changes for the winter temperature in CMASA.

• Spatial and Temporal Characteristics of Air Temperature in China Loess Plateau in Spring
• ZHANG Ding-quan;WANG Yi-rong
• 2005 Vol. 24 (6): 898-904. 
• Abstract ( ) PDF (775KB) ( )
• Using the air temperature data in China Loess plateau from 1961 to 2000,and wavelet method,the characteristic of air temperature change in this region are studied.The results show that there are three region in air temperature change of Loess Plateau,the abrupt change of air temperature happens in 1991/1992,and it quickly warm after abrupt.The air temperature is negative anomaly before abrupt,but positive anomaly after abrupt.The middle period of 1980's is the coldest,the later period of 1990's is the warmest.There are 3,5,5~6 year periodic oscillations,but 3-year periodic oscillations is significant.The main characteristic of spatial change of month-to-month air temperature is consistent in all region.The air temperature in each region is to take rising as mains,and is the most significant in 1990's.The biggest regions of ascending velocity and interannual change argument are main in the middle part of Loess Plateau.The quasi 5-year interannual oscillations and 10~12 year interdecadal oscillations are the most obvious in monthly air temperature change.

• Temporal and Spatial Distributions of Cloud Water Resources over Northwestern China
• CHEN Yong-hang;HUANG Jian-ping;CHEN Chang-he;ZHANG Qiang;FENG Jian-dong;JIN Hong-chun;WANG Tian-he
• 2005 Vol. 24 (6): 905-912. 
• Abstract ( ) PDF (355KB) ( )
• The temporal and spatial characteristics of cloud water resources over Northwestern China have been analyzed using the ISCCP (International Satellite Cloud Climatology Project)monthly mean D2 data from July 1983 to December 1998.The Northwestern China has been divided into three climatical regionsin this study.The results show that the regional averaged total cloud amount,optical thickness and water path are between 52.5%~58.3%,2.6~6.6 and 44.9~77.6 g·m^-2,respectively.The major feature of spatial distribution resources that higher value areas of cloud properties are all over Tianshan Mountains,Kunlun Mountains and Qilian Mountains,while the lower values of cloud properties locate over Tarim Basin,the western desert of Inner Mongolia and the northwestern part of Loess Plateau.The cloud properties also show an increasing tendency during recent years over the Plateau climatical region which includes Qilian Mountains and Qinghai province.In particular,the optical depth and water path have risen 0.8 and 16.4 g·m^-2 in the 15 years,respectively.

• The Study of Retrieving Clear Atmospheric Temperature Profile with Satellite Infrared Simulation Data
• HUANG Jing;QIU Chong-jian;ZHANG Yan-wu
• 2005 Vol. 24 (6): 913-919. 
• Abstract ( ) PDF (310KB) ( )
• The inversion of HIRS/3 data is a typical ill-posed problem.SVD is an effective method which can solve ill-conditioned linear equations.It can keep numerical stability and utilize more effective information of each detection channels when it met the ill-posed problem of matrix.With SVD method,the data space and parameter space were classed and the effective information was extracted to retrieve temperature profiles.The ideal data tests analyzed some influence factors to retrieval results.These influence factors include temperature first-guess profile and vapor profile. The results indicate that for HIRS/3 data,the truncation exponent number of SVD can be chosen from four to seven,the first-guess profile has some effect on the retrieval and the inversion results are the steadiest when the errors in middle-level were biggish;the perturbation of vapor profile also has some biggish effect on the temperature retrieval results in middle-low levels and the brightness temperature in five,eight,ten,eleven and sixteen channels.

• Radiation Forcing of Dust Aerosol from Hunshan Dake Sandland in China
• CHENG Tian-tao;Lü Da-ren;XU Yong-fu
• 2005 Vol. 24 (6): 920-926. 
• Abstract ( ) PDF (309KB) ( )
• The observation data of radiation on surface in spring 2001 and atmospheric radiative transferring model were employed to estimate the radiation forcing of dust aerosol over Hunshan Kake Sandland in China.The results showed that the daily change of atmospheric transmissivity was great,it was above 0.80 in fair day and below 0.01 in dusty day.Comparing with fair day,the radiation forcing of dust aerosol in dusty day caused atmospheric temperature decreasing in day time and increasing at night.In spring of 2001,the mean atmospheric transmissivity was 0.6,the mean long-wave radiation forcing by dust aerosol on surface was 16.76 W·m^-2,the mean long-wave radiation balance forcing by dust aerosol on surface was 62.76 W·m^-2.

• Linkage of Arctic Oscillation and Winter Temperature in Northeast China
• LI Chun;FANG Zhi-fang
• 2005 Vol. 24 (6): 927-934. 
• Abstract ( ) PDF (493KB) ( )
• The National Center for Environmental Prediction/National Center for Atmospheric Research(NCEP/NCAR) reanalysed data from 1950 to 1999 and the temperature data of the Northeast China in winter are adopted to study the relation between the Arctic Oscillation Indices(AOI) and the temperature of the Northeast China in winter with the aid of EOF resolution,coherent analysis,synthetic analysis and correlation-graph method.The results show that AOI has distinguished uptrend(the trend coefficient is R=0.35) with amplitudes smaller before the winter of 1968/1969 and much larger after that winter.And the uptrend of AOI and the temperature of the Northeast China in winter are compatible(with correlation coefficient R=0.59).Further investigation find that the anomaly of AO contributes to the temperature anomalies of the Northeast China through the interaction of the Siberian high,Aleutian low,the polar easterlies in east Asia and the winds anomalies in winter in this area.

• NO_X Distribution over the Qinghai-Xizang Plateau and Its Relationship with O₃
• LI Qing;CHEN Yue-juan;SHI Chun-hua;ZHOU Ren-jun
• 2005 Vol. 24 (6): 935-940. 
• Abstract ( ) PDF (263KB) ( )
• Using the HALOE data(from 1992 to 2002),the features of the vertical distribution of nitrogen-oxide over the Qinghai-Xizang Plateau in summer and winter have been discussed,the mixing ratio of NO_X in different altitudes over the Qinghai-Xizang Plateau is compared with that of the same latitudes and longitudes,then the relationship of the zonal distribution of NO_X with O₃ and the correlation between the time series of the mixing-ratio of NO_X and O₃ have been analyzed.The followed conclusions are made: From 300 to 30 hPa the mixing ratios of NO_X over the Qinghai-Xizang Plateau in summer is higher than that of in winter;The mixing ratio of NO₂ over the Qinghai-Xizang Plateau is much higher than that of in the same latitudes at 200~30 hPa layer,it is also higher than that of in the same longitudes at 100~60 hPa layer.There is inverse correlation between the zonal distribution of NO_X and the zonal distribution of O₃ from 100 to 30 hPa;In summer near 100 hPa and from 70 hPa to 35 hPa the negative correlation between the time series of mixing ratios of NO_X and O₃ over the Qinghai-Xizang Plateau is very evident.

• Analysis on Southwest Vortex Rainstorm in Lower Latitude Plateau of China
• ZHANG Xiu-nian;DUAN Xu
• 2005 Vol. 24 (6): 941-947. 
• Abstract ( ) PDF (339KB) ( )
• In this paper the eight southwest vortex cases moving southeast were selected and their composited flow fields and the mesoscale filter fields were investigated.It has been found that the heavy rain mainly occurred in their southwest quadrants.The mesoscale systems of convergence line and field of deformation and vortex were the direct weather systems which caused rainstorm.These southwest vortexes were deeper and could reached up 300 hPa levels or 400 hPa levels.The rainstorms is to be brought by the dynamic disturbance and cold air moving and southwestern warm wet air forcing climbing.

• Scattering Properties of Poly-Disperse Small Spheroid Particles under Normal Distribution of Their Rotatory Axes
• HU Fang-chao;WANG Zhen-hui;CHEN Zhong-rong
• 2005 Vol. 24 (6): 948-955. 
• Abstract ( ) PDF (336KB) ( )
• By using the method of numerical integration,the scattering cross-section of groups of small rotating spheroid in the several basic directions is calculated and figured with different variance,expectation and wave lengths,under the condition of normal distribution.Those results are analyzed and discussed and used as a new ground which can improve the accuracy of radar measurement,especially be useful for the study of atmospheric radiative transfer and microwave remote sensing.

• Application of Self-Adaptive Kalman Filter Method to Radar Rainfall Estimation and Flood Forecasting
• ZHAO Kun;GE Wen-zhong;LIU Guo-qing;LI Zhi-jia
• 2005 Vol. 24 (6): 956-965. 
• Abstract ( ) PDF (664KB) ( )
• Rainfall estimation from radar data has been increasingly used for flood forecasting applications,but the errors of rainfall estimation from radar data often led to the bad performance of hydrological model.In this paper,we use self-adaptive Kalman filter method to calibrate rainfall estimation from radar data which then are applied to Xin'anjiang model to forecast flood of SHIGUANHE catchment during at 08:00 on 28 June to 20:00 on 5 July 1998 in GAME/HUBEX experiment period.By comparison of the predicted flood from radar data and that from gauge data,the results show that both the value of the flood forecasted from radar data and that from rain gauge data agreed well with the observed value.Among them,the result from radar data is more closer to the observed value than that from rain gauge data.

• A New Cluster Method Applied to Yearly Highest and Lowest Air Temperature Region Divisions in China
• LIU Ji-feng;LI Shi-jie;DING Yu-guo;LU Qi-feng
• 2005 Vol. 24 (6): 966-973. 
• Abstract ( ) PDF (320KB) ( )
• The yearly characteristics of the highest and lowest temperatures in China are divided using method of the combine of clustering analysis with statistic test and the rotating principal component.The result shows that the two methods can supplement each other to make the region division more objective.Their yearly changes of the highest and lowest temperatures in China can be divided into 12 and 11 regions,respectively.The yearly changes and its phase characteristic are different among these areas for the highest temperature;as far as the lowest temperature,there are accordant increments of temperature.The relations between the highest-and lowest-temperatures and averaged temperature are clearly discriminating in different areas;the correlation of every decade are more prominent than those of yearly.

• A Study on Spatial Interpolation Methods for Climate Variables Based on Geostatistics
• YUE Wen-ze;XU Jian-hua;XU Li-hua
• 2005 Vol. 24 (6): 974-980. 
• Abstract ( ) PDF (735KB) ( )
• Based on reviewing the origin,development and basic principles of Geostatistics,two kinds of interpolation methods concretely ordinary Kriging and Cokriging are discussed.As no single method among so many available ones to spatial interpolation of climate variables is optimal for all regions and all variables,the interpolation methods are discussed based on Geostatistics by using annual average precipitation and evaporation in Gansu province from 1961 to 1990.Based on different semivariogram theory models we adopt ordinary Kriging and Bivariate Cokriging,by comparing of them the obtained conclusions are as follows: (1) No matter multi-year average precipitation or evaporation all presented obvious gradient change on space,the change ranges of both were great,the former was larger than the latter.Multi-year Annual average precipitation decreased gradually from southeast to northwestward,but evaporation was opposite,increased gradually from southeast to northwest.(2) According to semivariogram cloud plots and experiment variance minimum principle selected suitable semivariogram theory models based on Geostatistics interpolation method to interpolate,which could simulate space pattern spreading continuously of regionalized variable well,then get better interpolation effect.Comparing ordinary Kriging with Cokriging,as the latter input altitude which had an influence on precipitation and evaporation,it was more rational on space distribution and had a higher interpolation precision.(3) With Geostatistics methods the spatial interpolations could reflect the general space pattern of climate variables better in general,but the spatial interpolations precision of two methods were still not high,which still remained further improving.

• Short-Term Climate Prediction Model of Neural Network Based on Genetic Algorithms
• JIN Long;WU Jiang-sheng;LIN Kai-ping;CHEN Bing-lian
• 2005 Vol. 24 (6): 981-986. 
• Abstract ( ) PDF (283KB) ( )
• To set up the short-term climate prediction model in this paper,both the neural network and connection weights of genetic algorithm are optimized,the best individual in evolution process is reserved. Thus it can overcome the defects of unstability of neutral network initial weight and falling easily into local solution.As the applied example of a short-time climate forecast model,April mean precipitation in Guangxi area is taken as the predict and,the antecedent montly mean 500 hPa potential field and sea surface temperature filed in some high correlation areas are taken as the pedictors.Predictive performance between the new model and linear regression model for same predictors is discussed based on the independent samples.Results show that the model is superior in prediction accuracy and stability compared with the traditional method.

• A Study on Turbulent Flux Characteristic Near Surface Layer in the Region of Conversion from Farmland to Grasslands in Southern Ningxia
• ZHANG Xiao-yu;WANG Lian-xi;LIU Jing;SU Zhan-sheng;LI Feng-xia;YUAN Hai-yan
• 2005 Vol. 24 (6): 987-993. 
• Abstract ( ) PDF (275KB) ( )
• Based on the theory of Monin-Obukhov similarity and methods of aerodynamic and energy balance,the seasonal change characteristics and eddy momentum flux(including net radiation one,sensible heat one,latent heat one and soil heat one) characteristics near surface layer in the region of conversion from farmland to grasslands in southern Ningxia were analyzed using the data of microclimatic observation during 2002 to 2003,respectively.Those provide some valuable parameters for the understanding of land process,numerical simulation as well as the local microclimate climate analysis.

• Numerical Simulation of Influence of Different Vegetation Schemes on Local Precipitation in Northern Shaanxi Region
• GUO Jian-xia;DU Ji-wen;ZHENG You-fei
• 2005 Vol. 24 (6): 994-1001. 
• Abstract ( ) PDF (1865KB) ( )
• The mesoscale model(MM5V3.5) is applied to study the sensitivity of local precipitation to two different vegetation development schemes in Northern Shaanxi.It shows that owing to the vegetation improvement,the local rainfall belt shifts northward,the precipitation increases,and the rain period prolongs.Further study for the air circumfluence,the lower-layer stability,the moisture convergence and the vertical motion of atmosphere indicate that all of them make favorable responses to the local rainfall by the vegetation improving.However,it is evident that the larger the spatial scope of the vegetation changing,the more significant its influence on the local rainfall as mentioned above.

• Structural Characteristic of Meiyu Frontal Cloud System and Its Probable Causes
• YAO Xiu-ping;YU Yu-bin;ZHAO Bing-ke
• 2005 Vol. 24 (6): 1002-1011. 
• Abstract ( ) PDF (1966KB) ( )
• The characteristics ofthe evolution and structure of the Meiyu Frontal Cloud Systems(MFCS) and its probable causes over Jianghuai River valley during the period of June 22~26,2003are analysed with the hourly satellite observed T_BB data set and precipitation data set in this paper.It can be revealed that MFCS is a stable low T_BB belt on which there exists mesoscale convective system(MCS),and MCS is composed of convective cells with different scales and strengths(including meso-β and meso-γ convective cells).These lead to the ununiformity precipitation distribution(both in temporal and spatial).MFCS during this torrential rain process exhibits fully three kind organized structures within mesoscale convective systems.It is also showed that the close relationship between the interaction based on MFCS and the cloud systems in the mid-high latitude or tropical convective belt and the torrential rain process.The maintenance and development of MFCS results from the strong cyclone over Huanghuai Region and the interaction impact between cold and warm air over the Huaihe River basin.

• Analysis and Numerical Simulation for Effects of Vortex and Jet Stream on Heavy Rain in East Sichuan in September 2004
• HE Guang-bi;CHEN Jing;LI Chuan;FENG Han-zhong
• 2005 Vol. 24 (6): 1012-1023. 
• Abstract ( ) PDF (3167KB) ( )
• We have analyzed the effects of vortex in the basin and jet stream on heavy rain in the east of Sichuan province in September 2004,and have done numerical simulation.The results show the process of precipitation is related to mesoscale cloud mass,jet stream and vortex activities in mid- and lower- levels,at the same time,and along with to activities of subtropical high pressure and "SHANG DA"typhoon.The vortex in Sichuan basin appeared in the left of lower-jet stream,and the heavy rain in the east of Sichuan occurred in the south of upper level jet stream,there exits strong south-east lower jet stream to south-east of low vortex.Maintaining of positive vortex in the basin is benefit to the development and lasting of the vertical ascending movement over the basin,and provided dynamic condition for heavy rain.Vertical ascending movement was the ligament linking jet stream and basin vortex as well as dynamic driving result in the basin.The south-west jet stream had built before the heavy rain appeared,and heavy rain and basin vortex appeared almost at the same time,as well as the heavy rain,low jet stream and basin vortex weaken together.The high jet stream was progressively increasing before and during the process of the precipitation.When the upper level jet stream weakened,heavy rain was ending.

• Temperature Anomaly Features in Northeast China and East of North China and Primarily Analysis of Its Mechanism
• WANG Hong-yu;GONG Qiang;SUN Feng-hua;YANG Su-ying
• 2005 Vol. 24 (6): 1024-1033. 
• Abstract ( ) PDF (887KB) ( )
• It is demonstrated that the temperature anomaly in the Northeast China and the east of North China(NEEN) is the first rotating loading eigenvector of temperature anomaly of China,then its anomaly features and mechanism are studied based on REOF,SVD methods.The main results are as follows: There is warming trend of yearly and seasonal temperatures in the NEEN,especially in winter,and mean minimums temperature increases more obvoius than mean maximum ones;NEEN's warming extend is more than 20^th century average warming value of the global in the recent 100 years.On both lower and middle layers of the troposphere in winter,NEEN's temperature is higher when west wind is stronger,and it is contrary when longitudinal wind is stronger.In summer,NEEN's temperature anomaly is related to the strong or weak stages of Northeastern cold vortex on 500 hPa;It exists some relationship between NEEN's warming and pressure field interdecadal variation in lower-middle troposphere from 1980's,but their relation isn't notable between summer/winter temperatures and East Asian summer/winter monsoons,sea surface temperature in Nino 3.The temperature is always lower in the Northeast China when the sea surface temperature is higher in Nino 3 before 1990.

• Analyses on Features of Atmospheric Circulation in Cold and Warm Winter Years of Dalian
• ZHANG Li-hong;WANG Qian-qian
• 2005 Vol. 24 (6): 1034-1039. 
• Abstract ( ) PDF (1108KB) ( )
• The atmospheric circulation patterns in cold and warm winter years of Dalian during the period of years 1960-2000 are discussed in this paper based on the circulation composite analysis in nine warm and eight cold winters.The results show that there are significant differences in their SLPA fields,height anomaly fields at 500 hPa and zonal winds anomaly fields at 300 hPa.Moreover,it is found that Mongolia High,East Asian Trough,Polar Front Jet and the location,area and intensity of Polar Vortices are notable different,which interpret Polar Front Jet,East Asian Trough and Mongolia High have an important impact on winter temperature abnormality of Dalian.