检索结果-南通市图书馆

Journal of tropical {1. 2008年第2期14卷 113-116页

作者：谢炯光纪忠萍谷德军梁建茵 guangzhou Central Meteorological Observatory guangzhou {1. of tropical and marine meteorology CMA

The activity of South China Sea southwest monsoon (SCSSM) has direct impacts on the anomalies of important weather in Guangdong province during the raining seasons. So it is necessary to explore thoroughly the activity pattern of SCSSM and its relationship with important weather anomalies in the province. In this paper, the methods of composite analysis and correlation statistics are used to study the relationship between the onset date and intensity of SCSSM and the important weather, such as precipitation trends in Guangdong province during the annually first and second raining seasons, the timing of the annually first and last typhoon and the number of typhoons landing in Guangdong province. The results show that the rainfall is less than normal during the first raining season, but more than normal during the second one and there are more tropical cyclones landing in Guangdong province in the years of early SCSSM onset. The rainfall is more than normal during the second raining season and there are more tropical cyclones landing in Guangdong province in the years of strong SCSSM. The relationship between the SST of April - June, July - September and previous winter (December - February) and 500 hPa geopotential height and the onset date and intensity of SCSSM is analyzed. Some mechanisms between the onset dates and intensity of SCSSM and the important weather anomalies in Guangdong province are preliminarily explored. The results can be used for reference in short-term climate forecast.

关键词： southwest monsoon raining season monsoon onset monsoon intensity

A 28-Year Climatological Analysis of Size Parameters for Northwestern Pacific tropical Cyclones

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2007年第1期24卷 24-34页

作者：袁金南王东晓万齐林刘春霞 guangzhou {1. of tropical and marine meteorology China Meteorological AdministrationGuangzhou 510080 Laboratory for tropical {1. Environmental Dynamics South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301

A 28-year best track dataset containing size parameters that include the radii of the 1..4 m s^-1.winds （R1.） and the 25.7 m s^-1.winds （R26） of tropical cyclones （TCs） in the Northwestern Pacific, the NCEP/ NCAR reanalysis dataset and the Extended Reconstructed Sea Surface Temperature （ERSST） dataset are employed in this study. The climatology of size parameters for the tropical cyclones in the Northwestern Pacific from 1.77 to 2004 is investigated in terms of the spatial and temporal distributions. The results show that the major activity of TCs in the Northwestern Pacific is from July to October. A majority of TCs lie over the ocean west of 1.0°E, and a few TCs can intensify to the Saffir-Simpson （S-S） categories 4, 5. Both R1. and R26 tend to increase as the tropical cyclones intensify. The values of R1. and R26 are larger for intense TCs in the Northwestern Pacific than in the North Atlantic generally. Both R1. and R26 peak in October, and before and after October, R1. and R26 decrease, which is different from the case in the North Atlantic. The smaller R1.s and R26s occur in a large range over the Northwestern Pacific, while the larger R1.s and R26s mainly lie in the eastern ocean from Taiwan Island to the Philippine Islands where many tropical cyclones develop in intense systems. The tropical cyclones with size parameters of R1. or R26 on average take a longer time to intensify than to weaken, and the weak tropical cyclones have faster weakening rates than intensification rates. From 1.77 to 2004, the annual mean values of R1. increase basically with year; during the 28-year period, the value of R1. increases by 52.7 kin, but R26 does not change with year obviously.

关键词： climatology size parameters of tropical cyclones Northwestern Pacific a 28-year best track dataset

A METHOD OF INITIAL VORTEX RELOCATION AND NUMERICAL SIMULATION EXPERIMENTS ON tropical CYCLONE TRACK

在线全文

学校读者我要写书评

暂无评论

Journal of tropical {1. 2011年第1期17卷 36-42页

作者：袁金南宋丽莉黄燕燕陈子通刘春霞丁伟钰 Climate Center of Guangdong Province guangzhou {1. of tropical and marine meteorology CMA

Using the technique of smooth filtering and cylindrical filtering,the initial vortex circulation and large-scale environmental field were separated from the background *** the separated initial vortex circulation was translated and reinserted in the location where it was *** led to the determination of a method of initial vortex *** seven tropical cyclones at 23 points of measurement time in the years of 2006 and 2007,two schemes,either directly adding a tropical cyclone bogus model in the background or adding it after the relocation of the initial vortex in the background field,were *** experiments were *** results showed that the mean errors of the simulated tropical cyclone tracks at 24 and 48 hours were both smaller with the scheme of adding tropical cyclone bogus model after the relocation of the initial vortex in the background *** relocation method of the initial vortex decreases the error caused by the deviation of the initial tropical cyclone location in tropical cyclone *** relocation method is conducive to improving the track forecast of tropical cyclone models and has a good perspective for operational application.

关键词： relocation of initial vortex filter and translation tropical cyclone track numerical simulation

THE CELL-MOVE-EXPANSION MODEL FOR THE EVALUATION OF GROUND LEVEL POLLUTANT CONCENTRATION

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 1988年第3期5卷 325-333页

作者：向可宗 Guangdong institute of {1. marine meteorology guangzhou

A model for evaluating pollutant concentrations near the ground is developed. The main advantages of the model are its ability to estimate the distribution and variation of ground concentration under non-uniform or un... 详细信息

关键词： THE CELL-MOVE-EXPANSION MODEL FOR THE EVALUATION OF GROUND LEVEL POLLUTANT CONCENTRATION

Characteristics of the Boundary Layer Structure of Sea Fog on the Coast of Southern China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2011年第6期28卷 1377-1389页

作者：黄辉军刘洪年蒋维楣黄健毛伟康 School of Atmospheric Sciences Nanjing University Key Open Laboratory for tropical Monsoon and Joint Open Laboratory of {1. meteorology Guangzhou Institute of Tropical and Marine MeteorologyChina Meteorological Administration

Using boundary layer data with regard to sea fog observed at the Science Experiment Base for marine {1. at Bohe,Guangdong Province,the structure of the atmospheric boundary layer and the characteristics of the tops of the fog and the clouds were *** addition,the effects of advection,radiation,and turbulence during sea fog were also *** to the stability definition of saturated,wet air,the gradient of the potential pseudo-equivalent temperature equal to zero was defined as the thermal turbulence *** is evidence to suggest that two layers of turbulence exist in sea *** turbulence produced by long-wave radiation is prevalent above the thermal turbulence interface,whereas mechanical turbulence aroused by wind shear is predominant below the *** height of the thermal turbulence interface was observed between 1.0 m and 380 *** important factors are closely related to the development of the top of the sea fog：（1. the horizontal advection of the water vapor,（2） the long-wave radiation of the fog top,and（3） the movement of the vertical ***,development,and dissipation are the three possible phases of the evolution of the boundary-layer structure during the sea fog *** addition,the thermal turbulence interface is the most significant turbulence interface during the formation and development periods;it is maintained after sea fog rises into the stratus layer.

关键词： coast of Southern China sea fog boundary layer structure advection radiation turbulence

THE TEMPORAL AND SPATIAL DISTRIBUTION OF SEA SURFACE WIND ALONG THE COAST OF GUANGDONG PROVINCE IN CHINA

在线全文

学校读者我要写书评

暂无评论

Journal of tropical {1. 2019年第1期25卷 129-140页

作者： LIAO Fei DENG Hua CHAN Pak-wai guangzhou Meteorological Observatory guangzhou {1. of tropical and marine meteorology CMA Guangdong Ecological meteorology Center Hong Kong Observatory

Temporal and spatial distribution characteristics of sea surface wind in Guangdong's coastal areas were analyzed with data from four offshore observational stations between 201. and 201.. The results are shown as follows:(1. The probability distribution of wind speed was basically consistent with Gaussian distribution characteristics; winds of Beaufort force 6 or higher were observed mainly in far offshore stations from October to March.(2) The probability distribution of wind direction was represented well by Weibull distribution. The deviation of wind direction of far station was relatively small for it was mainly controlled by monsoon over the South China Sea, while the near offshore station had a relatively large diurnal variation because of the influence of local synoptic systems such as sea-land breeze.(3) There were significant seasonal differences in wind speed and direction observed by different offshore observational stations. In strong wind seasons, the deviation of wind direction was relatively small while the deviation of wind speed was relatively large, and vice versa. In contrast with Class I station, the other three stations exhibited approximately normal distribution of wind direction and wind speed deviations.(4) Wind direction diurnal variation was moderate in windy periods, while it was obvious in relatively lower speed conditions. The deviation of wind speed in windy periods was generally greater because it was influenced by mesoscale weather systems for 1.-20 h, and the influence was complicated, resulting in greater local differences in wind speed.

关键词： sea surface wind observation distribution characteristics

Air-sea interactions associated with tropospheric biennial oscillation in South China Sea summer monsoon and their effects on El Nio-Southern Oscillation

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2013年第6期32卷 6-12页

作者： ZHENG Bin LU Feng WEI Hongcheng guangzhou {1. of tropical and marine meteorology China Meteorological Administration Nanjing University of Information Science & Technology

The South China Sea summer monsoon （SCSSM） behaves with prominent climate variability from the in- traseasonal to interdecadal time scales. On the interannual time scale, the biennial variability （so-called tropospheric biennial oscillation, TBO） is as important as the E1.Nifio-Southem Oscillation （ENSO） period. Some observed data sets, including reanalysis data, are used to explore the associated air-sea interactive physical processes and how the SCSSM TBO affects the ENSO. The results show that the shearing vorticity induced by the north Indian Ocean sea surface temperature anomalies （SSTAs） and the anomalous Philip- pine Sea anticyclone both contribute to the TBO in the SCSSM. The results also indicate that the ENSO has a weak effect on the SCSSM TBO, whereas the latter affects the ENSO to some extent.

关键词： South China Sea monsoon tropospheric biennial oscillation El Nifio-Southern Oscillation

Gravity Wave Activity and Stratosphere-Troposphere Exchange During Typhoon Molave(2020)

在线全文

学校读者我要写书评

暂无评论

Journal of tropical {1. 2024年第3期30卷 306-326页

作者： HUANG Dong WAN Ling-feng WAN Yi-shun CHANG Shu-jie MA Xin ZHAO Kai-jing College of Ocean and meteorology/South China Sea {1. of marine meteorology/Laboratory for Coastal Ocean Variation and Disaster Prediction/Key Laboratory of Climate Resources and Environment in Continental Shelf Sea and Deep Sea(LCRE)/Key Laboratory of Space Ocean Remote Sensing and ApplicationMinistry of Natural ResourcesGuangdong Ocean UniversityZhanjiangGuangdong 524088 China Frontier Science Center for Deep Ocean Multispheres and Earth System(DOMES) Institute for Advanced Ocean Study(IAOS)Ocean University of ChinaQingdaoShandong 266100 China School of Earth and Environment University of LeedsLeeds LS29JT UK Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030 China

To investigate the stratosphere-troposphere exchange(STE)process induced by the gravity waves(GWs)caused by Typhoon Molave(2020)in the upper troposphere and lower stratosphere,we analyzed the ERA5 reanalysis data provided by the European Centre for Medium-Range Weather Forecasts and the CMA tropical Cyclone Best Track *** also adopted the mesoscale forecast model Weather Research and Forecasting model V4.3 for numerical *** of the previous studies were about typhoon-induced STE and typhoon-induced GWs,while our research focused on the STE caused by typhoon-induced gravity *** analysis shows that most of the time,the gravity wave signal of Typhoon Molave appeared below the *** was stronger on the east side of the typhoon center(1.°-20°N,1.0°-1.0°E)than on the west side,suggesting an eastward tilted structure with height *** the GWs in the upper troposphere and lower stratosphere region on the west side of the typhoon center broke up,it produced strong turbulence,resulting in stratosphere-troposphere *** this time,the average potential vorticity vertical flux increased with the average ozone mass mixing *** gravity wave events and STE process simulated by the WRF model were basically consistent with the results of ERA5 reanalysis data,but the time of gravity wave breaking was *** study indicates that after the breaking of the GWs induced by typhoons,turbulent mixing will also be generated,and thus the STE.

关键词： gravity wave typhoon stratosphere-troposphere exchange STE upper troposphere and lower stratosphere UTLS

The effects of the intertropical convergence zone on the easterly jet stream during Northern summer

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 1989年第2期8卷 209-215页

作者： Xu Liang Bao Chenglan Guangdong institute of {1. marine meteorology, guangzhou, China marine Environmental Forecasting Centre of SOA, Beijing, China Guangdong institute of {1. marine meteorology Guangzhou China. China

In this paper, a strong 1.CZ process and an 1.CZ - absent process during FGGE in 1.79 were selected for comparison to explore how they were subject to the influence of the evolution of the upper easterly jets.

关键词： In The effects of the intertropical convergence zone on the easterly jet stream during Northern summer ITCZ

THE EFFECT OF SAMPLE OPTIMIZATION ON THE ENSEMBLE KALMAN FILTER IN FORECASTING TYPHOON RAMMASUN(201.)

在线全文

学校读者我要写书评

暂无评论

Journal of tropical {1. 2018年第4期24卷 433-447页

作者： LI Ji-hang WAN Qi-lin GAO Yu-dong XIAO Hui Key Laboratory of Regional Numerical Weather Prediction Guangzhou Institute of Tropical and Marine Meteorology

In a limited number of ensembles, some samples do not adequately reflect the true atmospheric state and can in turn affect forecast performance. This study explored the feasibility of sample optimization using the ensemble Kalman filter(EnKF) for a simulation of the 201. Super Typhoon Rammasun, which made landfall in southern China in July 201.. Under the premise of sufficient ensemble spread, keeping samples with a good fit to observations and eliminating those with poor fit can affect the performance of En KF. In the sample optimization, states were selected based on the sample spatial correlation between the ensemble state and observations. The method discarded ensemble states that were less representative and, to maintain the overall ensemble size, generated new ensemble states by reproducing them from ensemble states with a good fit by adding random noise. Sample selection was performed based on radar echo data. Results showed that applying En KF with optimized samples improved the estimated track, intensity,precipitation distribution, and inner-core structure of Typhoon Rammasun. Therefore, the authors proposed that distinguishing between samples with good and poor fits is vital for ensemble prediction, suggesting that sample optimization is necessary to the effective use of En KF.

关键词： data assimilation ensemble prediction sample optimization Typhoon Rammasun ensemble Kalman filter