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AN AUTOMATIC DISASTER weather WARNING SYSTEM

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Natural Disaster Reduction in china 1995年第3期 115-119页

作者： Qiu Guoqing and Wang Jizhi (national Meteorological center. beijing 100081)

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Prediction model for spring dust weather frequency in North china

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Science china Earth Sciences 2008年第5期51卷 709-720页

作者： LANG XianMei center for Disastrous Climate Research and Prediction, Institute of Atmospheric Physics, Chinese Academy of Sciences, beijing 100029, china center for Disastrous Climate Research and Prediction Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

It is of great social and scientific importance and also very difficult to make reliable prediction for dust weather frequency (DWF) in North china. In this paper, the correlation between spring DWF in beijing and Tianjin observation stations, taken as examples in North china, and seasonally averaged surface air temperature, precipitation, Arctic Oscillation, Antarctic Oscillation, South Oscillation, near surface meridional wind and Eurasian westerly index is respectively calculated so as to construct a prediction model for spring DWF in North china by using these climatic factors. Two prediction models, i.e. model-I and model-II, are then set up respectively based on observed climate data and the 3.-year (1970 -2001) extra-seasonal hindcast experiment data as reproduced by the nine-level Atmospheric General Circulation Model developed at the Institute of Atmospheric Physics (IAP9L-AGCM). It is indicated that the correlation coefficient between the observed and predicted DWF reaches 0.93. in the model-I, suggesting a high prediction skill one season ahead. The corresponding value is high up to 0.948 for the subsequent model-II, which involves synchronous spring climate data reproduced by the IAP9L-AGCM relative to the model-I. The model-II can not only make more precise prediction but also can bring forward the lead time of real-time prediction from the model-I’s one season to half year. At last, the real-time predictability of the two models is evaluated. It follows that both the models display high prediction skill for both the interannual variation and linear trend of spring DWF in North china, and each is also featured by different advantages. As for the model-II, the prediction skill is much higher than that of original approach by use of the IAP9L-AGCM alone. Therefore, the prediction idea put forward here should be popularized in other regions in china where dust weather occurs frequently.

关键词： spring dust weather frequency prediction model iap9l-agcm hindcast experiment real-time prediction

Three Dimensional Shape of the Magnetopause: Global MHD Results

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Three Dimensional Shape of the Magnetopause: Global MHD Resu...

第28届中国气象学会年会

作者： J. Y. Lu 1 , Z. –Q. Liu 2 , K. Kabin 3.1 national center for space {3., beijing, 100081 2 Chinese Academy of Meteorological Science, beijing, 100081 3.Royal Military College of Canada, Kingston, Ontario, K7K 7B4

The numerical results from a physics-based global magnetohydrodynamic （MHD） model are used to examine the relationship between the shape and size of the magnetopause and the solar wind conditions. The magnetopause location is identified by tracing three-dimensional streamlines through the simulation domain and is fitted by simple analytical functions. The resulting model is applicable for approximating magnetopause location for dipole tilt angle ~ 0 and interplanetary magnetic field （IMF） Bx and By = 0 nT at both low and high magnetospheric latitudes. In both regions the results are compared with available empirical models. It is shown that IMF Bz mainly affects the flaring angle （the magnetopause shape） and has smaller effects on the magnetopause size. In contrast, the solar wind Dp mainly affects the magnetopause standoff distance （magnetopause size） and has little effect on the magnetopause shape. Both conclusions are consistent with empirical models.

关键词： MHD, solar wind/magnetosphere interaction, magnetopause

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1999年北半球大气环流特征及其影响

气象 2000年第4期26卷 12-16页

作者： Song Wenling (national Climate center,beijing {3.) 国家气候中心北京 100081

1999年北半球主要环流特征为 :5 0 0 h Pa西太平洋副热带高压较常年明显偏弱 ,春、夏季副高位置异常偏东 ;东亚地区夏季 5 0 0 h Pa位势高度距平场上表现为北高南低 ,大陆高压较强。亚洲中纬度经、纬向环流交替出现 ,阶段性明显 ;冬季... 详细信息

1999年北半球主要环流特征为 :5 0 0 h Pa西太平洋副热带高压较常年明显偏弱 ,春、夏季副高位置异常偏东 ;东亚地区夏季 5 0 0 h Pa位势高度距平场上表现为北高南低 ,大陆高压较强。亚洲中纬度经、纬向环流交替出现 ,阶段性明显 ;冬季冷空气异常偏弱 ,东亚夏季风加强。冬、春季热带对流活动强盛 ,入夏以后迅速减弱。在 L a-

关键词：环流特征西风环流季风 La-nina 环流特征

Ionospheric total electron content variations prior to the 2008 Wenchuan Earthquake

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Ionospheric total electron content variations prior to the 2...

中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： BIQIANG ZHAO~*+,MIN WANG++,TAO YU§,GUIRONG XU, WEIXING WAN+ and LIBO LIU+ + beijing national Observatory of space Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,beijing 100029,china ++ Institute of Earthquake Science china Earthquake Administration, beijing 10003.,china§national center for space weather,china Meteorological Administration,{13.,china Institute of Heavy Rain,china Meteorological Administration,Wuhan 43.074,china

On 12 May 2008 at 06:28 UT a major earthquake of magnitude 8.0 struck Wenchuan County(3..0°N,103.4°E) in southwest *** total electron content(TEC) values,derived from a network of 58 global positioning system(GPS) receivers over china and nearby countries,were used to investigate the ionospheric precursor of the great *** observations revealed that there was an anomalous enhancement in TEC(100%increase on the 15-day median) during the afternoon-evening sector on 9 May 2008 while geomagnetic conditions were quiet(K≤2).The TEC variations on the west side and east side of the epicentre show large dissimilarity on 9 May *** constructing the longitude /latitude TEC map,the distribution of the region predominated by increased TEC values was shown to be localized at longitudes 90-13.°*** results suggest that this abnormal enhancement was most possibly a seismo-ionospheric signature.

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Nightside field-aligned current during the April 6,2000 superstorm

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Nightside field-aligned current during the April 6,2000 supe...

中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： WANG Yuan~(1,2),HONG MingHua~(1*),CHEN GengXiong~1,XU WenYao~1,DU AiMin~(1,3., ZHAO XuDong~(1,2),LIU XiaoCan~4 & LUO Hao~(1,2) 1 Institute of Geology and Geophysics,Chinese Academy of Sciences,beijing 100029,china 2 Graduate University of Chinese Academy of Sciences,beijing 100049,china 3.State Key Laboratory of space weather,beijing 100190,china 4 Institute of Geophysics,china Earthquake Administration,beijing 100081,china

Using the east-west geomagnetic disturbance fields observed from stations at mid-latitudes,we investigate the characteristics of field-aligned currents on the nightside during the April 6,2000 *** results indicate that there is an eastward disturbance on the nightside of Northern Hemisphere during the main phase of magnetic storm,while the interplanetary magnetic field (IMF) is continued *** positive disturbances in the postmidnight are larger than that in the *** suggests that upward field-aligned currents develop on the nightside,when the IMF is directed *** peak of upward field-aligned currents is located in postmidnight,and it will be more obvious at substorm *** get the conclusion that both partial ring current and region-2 field-aligned current shift to dusk *** upward region-2 current is decreased at substorm onset,and intensified after *** also investigate the relationship between the upward field-aligned currents on the nightside and the auroral electrojets at high *** shows a good correspondence between region-2 current and the westward electrojet in the *** suppose that they are both associated with the convection electric field.

关键词： main phase field-aligned current auroral electrojet substorm current wedge

Bioinformatics analyses for signal transduction networks

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Science china(Life Sciences) 2008年第11期51卷 994-1002页

作者： LIU Wei1,2, LI Dong2, ZHU YunPing2 & HE FuChu1,2 1 College of Mechanical & Electronic Engineering and Automatization, national University of Defense Technology, Changsha 410073. china 2 State Key Laboratory of Proteomics, beijing Proteome Research {3., beijing Institute of Radiation Medicine, beijing 102206, china College of Mechanical & Electronic Engineering and Automatization National University of Defense Technology Changsha China State Key Laboratory of Proteomics Beijing Proteome Research Center Beijing Institute of Radiation Medicine Beijing China

Research in signaling networks contributes to a deeper understanding of organism living activities. With the development of experimental methods in the signal transduction field, more and more mechanisms of signaling pathways have been discovered. This paper introduces such popular bioin-formatics analysis methods for signaling networks as the common mechanism of signaling pathways and database resource on the Internet, summerizes the methods of analyzing the structural properties of networks, including structural Motif finding and automated pathways generation, and discusses the modeling and simulation of signaling networks in detail, as well as the research situation and tendency in this area. Now the investigation of signal transduction is developing from small-scale experiments to large-scale network analysis, and dynamic simulation of networks is closer to the real system. With the investigation going deeper than ever, the bioinformatics analysis of signal transduction would have immense space for development and application.

关键词： signal transduction structural motif automated pathways regeneration dynamics simulation

Dependence of magnetic field just inside the magnetopause on subsolar standoff distance:global MHD results

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Dependence of magnetic field just inside the magnetopause on...

第十四届全国日地空间物理学术研讨会

作者： Wang Ming1,2 Lu JianYong1,2 Liu ZiQian3.Pei ShiXin1 (1 College of Math & Physics, Nanjing University of Information Science & Technology, Nanjing 210044, china ) (2 national center for {3. weather, china Meteorology Administration, beijing 100081, china ) (3.Chinese Academy of Meteorological Science, Graduate University of Chinese Academy of Science, beijing 100081, china )

The subsolar magnetopause is the boundary of solar wind and the Earth’s magnetosphere where reduced solar wind dynamic pressure is equal to the magnetic pressure of the Earth’s outer magnetosphere. We use a global MHD model to estimate the ratio （f） of the compressed magnetic field just inside the subsolar magnetopause to the purely dipolar magnetic field. We also compared our numerical results with a similar work by Shue with the THEMIS data. Our results show that the ratio f is linearly proportional to the subsolar magnetopause standoff distance （r0） for both northward and southward interplanetary magnetic field, which in property is consistent with Shue’s result but the proportionality constant is smaller, although previous theoretical studies show that the ratio f is nearly independent of the subsolar standoff distance. The global model results also show that the ratio f is smaller for the southward IMF under the same r0 and the proportionality constant for the southward IMF is larger than that for the northward IMF. Both conclusions agree with statistical results from observations by Shue.

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The boundary layer characteristics in the heavy fog formation process over beijing and its adjacent areas

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Science china Earth Sciences 2005年第Z2期48卷 88-101页

作者： ZHANG Guangzhi, BIAN Lingeng, WANG Jizhi, YANG Yuanqin, YAO Wenqing & XU Xiangde HWL of Chinese Academy of Meteorological Sciences, beijing 10008, china national Meteorological {3., beijing 100081, china HWL of Chinese Academy of Meteorological Sciences Beijing 10008 China national Meteorological center Beijing 100081 China

By utilizing the Atmospheric Boundary Layer (ABL) observational data made available from the project "973. under the auspices of the Ministry of Science and Technology of the People's Republic of china - entitled the beijing City Air Pollution Observation Field Experiment (BECAPEX), including the measurements by a wind profiler, captive airships, tower-based boundary layer wind and temperature gradient observational instruments (ultrasonic anemometers and electronic thermometers), air composition samplers, conventional upper-air, surface and Automatic weather Stations (AWS) observations, this paper herewith analyzes, in a comprehensive manner, the occurrence of a heavy fog event over beijing in February 2001, including its formation, development, persistence, dynamic and thermodynamic features as well as evolving stratification structures within the boundary layer at different stages. The results suggested: (i) as a typical case of urban heavy fog, before the fog onset over beijing, a temperature inversion existed in the lower atmosphere, the smokes and the pollutants like SO2 and NO2 had been accumulated at a lower level. Proceeding the fog event, with the increase of SO2 and NO2 concentrations, condensability increased sharply. On the contrary, during the fog process, with increasing condensability, SO2 and NO2 concentrations decreased. This indicated that, acting as condensation nucleus, these accumulated pollutants were playing a key role in catalyzing the fog condensation. (ii) By analyzing mean gradient-, pulsation- and turbulence-distribution patterns derived from the wind measurements taken by the aforementioned tower-based instruments, they all indicated that about 10 hours before the fog onset, a signal foretelling potential strong disturbances in the lower boundary layer was detected, and a significant rise of both mean and disturbance kinetic energies was observed, revealing that the low-level wind shear was strengthened before the fog onset, consequentl

关键词： beijing heavy fog, SO2 and NO2, catalyzing fog condensation, disturbance kinetic energy signal.