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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 100036,china§national center for space weather,china meteorological administration, beijing 100081,china Institute of Heavy Rain,china meteorological administration,Wuhan 430074,china

On 12 May 2008 at 06:28 UT a major earthquake of magnitude 8.0 struck Wenchuan County(31.0°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 90-130°*** results suggest that this abnormal enhancement was most possibly a seismo-ionospheric signature.

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Simulation of 1991-2005 Meiyu seasons in the Yangtze-Huaihe region using BCCRegCM 1.0

Simulation of 1991-2005 Meiyu seasons in the Yangtze-Huaihe ...

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第七届全国优秀青年气象科技工作者学术研讨会

作者： HU YaMin1,2 DING YiHui3 1 Guangdong Climate center, Guangzhou 510080, china 2 Institute of Tropical and Marine Meteorology, china meteorological administration, Guangzhou 510080, china 3 national Climate center, china meteorological administration, beijing 100081, china

By using BCCegCM 1.0 (RegCM for short) from beijing Climate center (BCC), china meteorological administration (CMA), the Meiyu season characters over the Yangtze-Huaihe region during 1991～2005 are simulated. The major conclusions of this study may be summarized as the following: (1) RegCM can reproduce the interannual variation and the spatial distribution of the summertime precipitation and temperature in the Yangtze-Huaihe region. (2) By use of a generalized Meiyu criterion and in accordance with model-calculated precipitation and temperature, the Meiyu onset and ending date have been determined. Compared with the observation, RegCM can simulate the interannual variation of the Yangtze-Huaihe Meiyu with preferable capability for most of the normal Meiyu years (such as 1995, 1997, 2000, 2001, 2002 and 2004), especially for the rich Meiyu years of 1996, 1998 and 1999. (3) In terms of the average simulation for the recent 15a, the timings of onset and ending of Meiyu occur on June 1 and July 13, respectively, which are earlier than the climatological observation. For duration, Meiyu persists for 32 day, 3 days shorter than the observation. The index of Meiyu intensity is 2.45, while the climatological one is 3.00. Therefore, RegCM is capable of simulating the climatological Meiyu duration and intensity, while the capability of simulating the onset and ending date of Meiyu still needs to be improved.

关键词： regional climate model Meiyu in Yangtze-Huaihe region Meiyu onset Meiyu ending Meiyu rainfall

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A LAI Inversion Algorithm Based on Directional Reflectance

A LAI Inversion Algorithm Based on Directional Reflectance

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中国气象学会2004年年会

作者： Tang Shihao~(12) (1 national Satellite meteorological center, china meteorological administration, beijing 100081, china 2 Remote Sensing and GIS Research center, Department of Geography, beijing Normal University, beijing 100875, china)

＜正＞Leaf area index (LAD is an important ecological and environmental parameter. The current remote sensing inversion methods of leaf area index can mainly（?）e grouped into two classes: vegetation index based methods and remote sensing physical model based methods. In this paper, a new LAI retrieval method is developed. The algorithm borrows ideas from the principles and methods of ground LAI measurements, and adopts a new frame which differs from traditional remote sensing LAI inversion methods. First, the relationship between LAI and directional gap fraction is derived from the definition of LAI. Then, directional gap fraction is acquired from remote sensing bidirectional reflectance distribution function （BRDF） product. This acquisition is obtained by the use of a kernel driven model and a large scale directional gap fraction algorithm. At last, the large scale LAI is calculated through angle integrations. This algorithm has been applied to get LAI distribution of china in the middle of July, 2002. The ground data acquired from two field experiments conducted in Changbai Mountain and Qiiian Mountain, china, are used to validate the algorithm. In order to resolve the scale change problem between high resolution grouad observation and low resolution remote sensing data, two high resolution remote sensing images almost ha, ing the same resolutions with ground measurements are used as transitions. In order to proceed, we first bulid an empirical relationship between measured LAI and high resolution reflectance. Then, we get high resolu ion LAI distribution according to that relation. The LAI value of a low resolution pixel is calculated from the areal weighted sum of high resolution LAIs composing the low resolution pixel. Our results show that the algo（?）ithm has a high precision. Factors that may influence the precision of the algorithm are also discussed in this paper.

关键词： LAI MODIS BRDF ALBEDO Gap fraction

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基于SSM/I被动微波数据的中国积雪深度遥感研究

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山地学报 2008年第1期26卷 59-64页

作者：延昊张佳华中国气象局国家气象中心中国气象科学研究院

通过对积雪和其他地物的被动微波辐射计SSM/I的微波亮温进行波谱分析,提出了一个识别积雪的SSM/I微波检测方法,与MODIS的5d合成积雪范围数据进行了比较,结果表明SSM/I的积雪范围与MODIS基本一致。对提出的SSM/I的微波积雪深度反演方法... 详细信息

通过对积雪和其他地物的被动微波辐射计SSM/I的微波亮温进行波谱分析,提出了一个识别积雪的SSM/I微波检测方法,与MODIS的5d合成积雪范围数据进行了比较,结果表明SSM/I的积雪范围与MODIS基本一致。对提出的SSM/I的微波积雪深度反演方法进行了验证,与2006年冬季每日的中国地面积雪深度观测数据的相关系数R的平方为0.46～0.54,偏差为-0.3～0.8cm,均方根误差rmse为4.4～6.8cm。

关键词：积雪识别积雪深度被动微波辐射计SSM/I MODIS

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A Two-Moment Bulk Microphysics Coupled with a Mesoscale Model WRF:Model Description and First Results

A Two-Moment Bulk Microphysics Coupled with a Mesoscale Mode...

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强化科技基础推进气象现代化——第29届中国气象学会年会

作者： Gao Wenhua 1,Zhao Fengsheng 1,Hu Zhijin 2,and Feng Xuan 1 1 national Satellite meteorological center,china meteorological administration,beijing 100081 2 Chinese Academy of meteorological Sciences,china meteorological administration,beijing 100081

The Chinese Academy of meteorological Sciences(CAMS) two-moment bulk microphysics scheme was adopted in this study to investigate the representation of cloud and precipitation processes under different environmental *** scheme predicts the mixing ratio of water vapor as well as the mixing ratios and number concentrations of cloud droplets,rain,ice,snow,and graupel.A new parameterization approach to simulate heterogeneous droplet activation was developed in this ***,the improved CAMS scheme was coupled with the weather Research and Forecasting model(WRF v3.1),which made it possible to simulate the microphysics of clouds and precipitation as well as the cloud-aerosol interactions in selected atmospheric *** rain event occurring on 27-28 December 2008 in eastern china was simulated using the CAMS scheme and three sophisticated microphysics schemes in the WRF *** showed that the simulated 36-h accumulated precipitations were generally agreed with observations,and the CAMS scheme performed well in the southern area of the nested *** radar reflectivity,the averaged precipitation intensity,and the hydrometeor mixing ratios simulated by the CAMS scheme were generally consistent with those from other microphysics *** hydrometeor number concentrations simulated by the CAMS scheme were also close to the experiential values in stratus *** model results suggest that the CAMS scheme performs reasonably well in describing the microphysics of clouds and precipitation in the mesoscale WRF model.

关键词： droplet activation two-moment bulk microphysics WRF coupling

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Climatology of medium-scale traveling ionospheric disturbances observed by a GPS network in central china

Climatology of medium-scale traveling ionospheric disturbanc...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Feng Ding,Weixing Wan,Guirong Xu,Tao Yu,Guanglin Yang, and Jing-song Wang 1 beijing national Observatory of space Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,beijing,china. 2 Institute of Heavy Rain,china meteorological administration, Wuhan,china. 3national center for space weather,china meteorological administration,beijing,china.

[1]The 15-month climatology of medium-scale traveling ionospheric disturbances (MSTIDs) during a solar minimum period has been constructed from observations of a dense GPS receiver array in Central *** total,793 MSTID events are identified, with peaks in occurrence at 1500 LT and 0100 *** occurrence of MSTIDs decreases following an increase in geomagnetic activity,with 46%of the MSTIDS occurring in the *** MSTIDs are characterized by a major occurrence maximum around the winter solstice and by an equatorward propagation *** period,phase velocity,azimuth,and amplitude of daytime MSTIDs are 20-60 min,100-400 m/s, 130°-270°,and 0.8-1.5%,*** remaining 54%of the MSTIDs occurred at night,and were characterized by a peak in occurrence at the summer solstice and by a southwestward propagation *** period,phase velocity,azimuth,and amplitude of nighttime MSTIDs are 20-70 min,50-230 m/s,170°-300°,and 2-7%,respectively. The propagation directions and the seasonal behaviors support the view that daytime MSTIDs are an ionospheric manifestation of atmospheric gravity waves from the lower atmosphere,while a possible excitation mechanism of nighttime MSTIDs is the electrodynamics process caused by plasma instability in the F layer.

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A theoretical model for mid-and low-latitude ionospheric electric fields in realistic geomagnetic fields

A theoretical model for mid-and low-latitude ionospheric ele...

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中国科学院地质与地球物理研究所2008学术年会

作者： REN ZhiPeng~(1,2,3),WAN WeiXing~(1+),WEI Yong~(1,2,3),LIU LiBo~1 & YU Tao~(1,4) 1 beijing Observatory for space Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,beijing 100029, china 2 Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071,china 3 Graduate School of Chinese Academy of Sciences,beijing 100049,china 4 national center for space weather,china meteorological administration,beijing 100081,china

The geomagnetic fields,which play important roles in the ionospheric dynamo,can greatly affect the global distribution of ionospheric electric fields,currents and other ionospheric electrodynamics *** the study of ionospheric electrodynamics phenomena,such as the longitudinal variations of ionospheric electric fields,the non-dipolar component of the geomagnetic fields must be taken into *** this paper,we deduce a theoretical electric field model for ionospheric dynamo at mid- and low-latitude which adopt a modified magnetic apex coordinates *** the new electric field model,the geomagnetic fields can be calculated from either the IGRF model or the dipole field model, and the neutral winds and conductivities are calculated based on empirical *** the dynamo equation for the electric potential is finally solved in terms of the line-by-line iteration method,and the ionospheric electric fields and currents are derived from the calculated *** model can reproduce the main features of the ionospheric electrodynamics processes,so it will be a useful tool for the investigation of the upper atmosphere and ionosphere.

关键词： ionospheric dynamo ionospheric electric fields APEX coordinates

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An improvement on summer regional climate simulation over East china: importance of data assimilation of soil moisture

An improvement on summer regional climate simulation over Ea...

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第七届全国优秀青年气象科技工作者学术研讨会

作者： HU YaMin1, 2, DING YiHui3 & LIAO Fei2 1 Guangdong Climate center, Guangzhou 510080, china 2 Institute of Tropical and Marine Meteorology, china meteorological administration, Guangzhou 510080, china 3 national Climate center, china meteorological administration, beijing 100081, china

The Newtonian relaxation is used to assimilate data from the Second Global Soil Wetness Project (GSWP2) into the initial field for soil moisture in a regional climate model (i. e., BCCegCM 1.0, hereinafter called RegCM). The results show that different nudging parameters can improve the simulation of the air temperature and the precipitation to some extent in summertime sea-son over East china. When the nudging intensity is 0.5 and nudging duration is 5 days, the result is desirable. Introducing the data assimilation of soil moisture into RegCM, the amelioration is not only in the spatial distribution pattern but also in the mag-nitude of the temperature and the precipitation. More specifically, the assimilation experiments have corrected the systematical cold bias of the air temperature and the precipitation on the low side, which is much closer to the observation compared with the control experiment. On the whole, the assimilation experiments shed light on the fact that the simulated bias in the original RegCM may be affected by the description of soil moisture in the land surface process. Therefore, the effect of soil moisture in RegCM should be paid more attention in the future.

关键词： soil moisture Newtonian relaxation data assimilation regional climate simulation

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Strategy and methodology of dynamical analogue prediction

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Science china Earth Sciences 2007年第10期50卷 1589-1599页

作者： REN HongLi1,2? & CHOU JiFan1 1 College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, china 2 Laboratory for Climate Studies, national Climate center, china meteorological administration, beijing 100081, china College of Atmospheric Sciences Lanzhou University Lanzhou 730000 China Laboratory for Climate Studies National Climate Center China Meteorological Administration Beijing 100081 China College of Atmospheric Sciences Lanzhou University Lanzhou 730000 China

In order to effectively improve numerical prediction level by using current models and data, the strategy and methodology of dynamical analogue prediction (DAP) is deeply studied in the present paper. A new idea to predict the prediction errors of dynamical model on the basis of historical analogue information is put forward so as to transform the dynamical prediction problem into the estimation problem of prediction errors. In terms of such an idea, a new prediction method of final analogue correction of errors (FACE) is developed. Furthermore, the FACE is applied to extra-seasonal prediction experiments on an operational atmosphere-ocean coupled general circulation model. Prediction results of summer mean circulation and total precipitation show that the FACE can to some extent reduce prediction errors, recover prediction variances, and improve prediction skills. Besides, sensitive experiments also show that predictions based on the FACE are evidently influenced by the number of analogues, analogue-selected variables and analogy metric.

关键词： dynamical analogue prediction, prediction strategy, analogue correction of errors, extra-seasonal prediction

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A study of the chemical composition and transport of marine aerosols over the ocean near china

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Acta Oceanologica Sinica 1991年第3期10卷 407-422页

作者： Zhang Ni, Zhou Mingyu, Lu Naiping, F. P. Parungo, Wen Yupu, Yang Shaojing, Yang Yinan and Chen Binru national Research center for Marine Environmental Forecasts, State Oceanic administration, beijing, chinanational Oceanic and Atmospheric administration, Environmental Research Laboratories, Air Resources Laboratory, Boulder,CO, U.S. A.Academy of meteorological Sciences, State meteorological administration, beijing, chinaInstitute of High Energy Physics, Academia Sinica, beijing, china national Research center for Marine Env. Forecasts State Oceanic Admin. Beijing China China

In this paper the authors cite the aerosol samples collected with a KA-200 Anderson cascade Impactor and a KB-120 sampler during the first cruise of the Kuroshio investigation operated by the People's Republic of china and Japan cooperative program, from July 23 to August 21, 1987. The concentration size distributions and composition of marine aerosols over the Kuroshio area are analyzed. Neutron activation analysis is used to determine the elemental composition of the aerosols. The authors also discuss some characteristics of marine aerosols relating to long-range transport of crustal and anthropogenic elements from the continent to the remote ocean. Analytical results indicate that elements Al, Fe, Sc and Sb over this area are obviously influenced by the continent of Asia, and the size distributions are changed after long-range transport. The concentration of large particles increase. The concentrations of the elements C1 and Na are closely related to ocean conditions; the source of the elements Cl and Na is mainly the ocean. Besides coal combustion, the ocean is also a very important source for the element Se. The amount of Se is related to the distribution of marine life.

关键词： Sb A study of the chemical composition and transport of marine aerosols over the ocean near china over

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