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Search Results: 1 - 10 of 25569 matches for " PeiMing Dong "
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Short-range Climate Prediction Experiment of the Southern Oscillation Index Based on the Singular Spectrum Analysis

Liu Jianwen,Dong Peiming,
Liu Jianwen
,Dong Peiming

大气科学进展 , 2001,
Abstract: The Southern Oscillation Index (SOI) time series is analyzed by means of the singular spectrum analysis (SSA) method with 60-month window length. Two major oscillatory pairs are found in the series whose pe- riods are quasi-four and quasi-two years respectively. The auto-regressive model, which is developed on the basis of the Maximum Entropy Spectrum Analy- sis. is fitted to each of the 9 leading components including the oscillatory pairs. The prediction of SOI with the 36-month lead is obtained from the reconstruction of these extrapolated series. Correlation coeffcient between predicted series and 5 months running mean of observed series is up to 0.8. The model can successfully predict the peak and duration of the strong ENSO event from 1997 to 1998. It's also shown that the proper choice of reconstructed components is the key to improve the model prediction.
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics \mbox{\rm (LASG)}, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
Adjoint-based Sensitivity Analysis of a Mesoscale Low on the Mei-yu Front and Its Implications for Adaptive Observation

ZHONG Ke,DONG Peiming,ZHAO Sixiong,CAI Qifa,LAN Weiren,
,DONG Peiming,ZHAO Sixiong,CAI Qif,LAN Weiren

大气科学进展 , 2007,
Abstract: An adjoint sensitivity analysis of one mesoscale low on the mei-yu Front is presented in this paper. The sensitivity gradient of simulation error dry energy with respect to initial analysis is calculated. And after verifying the ability of a tangent linear and adjoint model to describe small perturbations in the nonlinear model, the sensitivity gradient analysis is implemented in detail. The sensitivity gradient with respect to different physical fields are not uniform in intensity, simulation error is most sensitive to the vapor mixed ratio. The localization and consistency are obvious characters of horizontal distribution of the sensitivity gradient, which is useful for the practical implementation of adaptive observation. The sensitivity region tilts to the northwest with height increasing; the singular vector calculation proves that this tilting characterizes a quick-growing structure, which denotes that using the leading singular vectors to decide the adaptive observation region is proper. When connected with simulation of a mesoscale low on the mei-yu Front, the sensitivity gradient has the following physical characters: the obvious sensitive region is mesoscale, concentrated in the middle-upper troposphere, and locates around the key system; and the sensitivity gradient of different physical fields correlates dynamically.
Direct assimilation of satellite radiance data in GRAPES variational assimilation system
GuoFu Zhu,JiShan Xue,Hua Zhang,ZhiQuan Liu,ShiYu Zhuang,LiPing Huang,PeiMing Dong
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0419-x
Abstract: Variational method is capable of dealing with observations that have a complicated nonlinear relation with model variables representative of the atmospheric state, and so make it possible to directly assimilate such measured variables as satellite radiance, which have a nonlinear relation with the model variables. Assimilation of any type of observations requires a corresponding observation operator, which establishes a specific mapping from the space of the model state to the space of observation. This paper presents in detail how the direct assimilation of real satellite radiance data is implemented in the GRAPES-3DVar analysis system. It focuses on all the components of the observation operator for direct assimilation of real satellite radiance data, including a spatial interpolation operator that transforms variables from model grid points to observation locations, a physical transformation from model variables to observed elements with different choices of model variables, and a data quality control. Assimilation experiments, using satellite radiances such as NOAA17 AMSU-A and AMSU-B (Advanced Microwave Sounding Unit), are carried out with two different schemes. The results from these experiments can be physically understood and clearly reflect a rational effect of direct assimilation of satellite radiance data in GRAPES-3DVar analysis system.
Triggering and Effects of the Secondary Circulation Associated with Upper and Low-Level Jets in a Heavy Rainfall Process

Zhang Weihuan,Dong Peiming,Shen Tongli,

大气科学 , 2000,
Abstract: The heavy rainfall process of July 23,1992 in Beijing-Tianjin-Hebei region is successfully simulated by using the meso-scale model MM4 with two-way nested grid By employing the model products with high temporal and spatial resolutions, the secondary circulation associated with upper and low-level jets is diagnosed The results show that the major factors forcing secondary circulation are different from those of typhoons and those of summer cyclones in Changjiang Huaihe river basin The overall secondary circulation is favorable for the accumulation of instability energy before the precipitation and provides a persistent ascending motion in the precipitation process There exists a positive feedback interaction between the heavy rainfall and jets
A Numerical Study of Two Kinds of Mesoscale Low (Disturbance) on Meiyu Front and Associated Heavy Rainfall

Dong Peiming,Zhao Sixiong,

气候与环境研究 , 2004,
Abstract: A numerical study of two kinds of mesoscale low (disturbance) and associated heavy rainfall on Meiyu front is carried out, aiming to further study their characteristics and physical mechanism of formation and development. By using the mesoscale numerical model MM5, the two mesoscale low (disturbance) and associated heavy rainfall are successfully simulated. Based on the model output with high spatial and time resolution, some detailed characteristics of low (disturbance) are obtained, the characteristics of upper level and low level flow and interaction between them are also revealed. In addition, the effect on mesoscale low (disturbance) and associated heavy rainfall of some physical processes are discussed, which include the parameterization scheme of precipitation, latent heating release, PBL process and the impact of local terrain.
Numerical Experiments of Effects of Planetary Boundary Layer Processes on Prediction of Heavy Rain in the Yangtze River in July 1998

Dong Peiming,Zhao Sixiong,

气候与环境研究 , 2003,
Abstract: The effects of planetary boundary layer processes on the prediction of heavy rain in the Yangtze River in July 1998 are studied by utilizing the ETA model. It is demonstrated that boundary layer is important in the forecast of heavy rain. The major results are as follows: (1) Large\|scale location of rainband is decided by the large\|scale flow patterns. However, boundary layer plays an important role in the prediction of heavy rain. (2) Without boundary layer processes, it is impossible to predict the weather system accurately because the flow patterns, moisture and instability in lower troposphere could not be described correctly, sequentially the forecast of heavy rain is unsuccessful (3) The surface fluxes assume a significant diurnal variation. So, the effects of boundary layer processes relate not only with the stages of formation, development and dissipation of heavy rain, but also the time (day or night) of formation, development and dissipation (4) The conditions between north and south area of the Yangtze River are quite different. There are the strong surface fluxes and sources of moisture and instability energy for the rain in south area of the Yangtze River.This area may has more important effects on the rain occurred in the Yangtze River.
张维桓 Zhang Weihuan,董佩明 Dong Peiming,沈桐立 Shen Tongli
大气科学 , 2000, DOI: 10.3878/j.issn.1006-9895.2000.01.05
Abstract: 使用双向嵌套数值模式MM4对1992年7月23日发生在副高北侧京津冀地区的一次大暴雨过程进行了成功的数值模拟。利用模拟得到的高时空分辨率资料,对伴随高、低空急流的次级环流进行了诊断,结果表明:激发次级环流的主要因子和台风、夏季江淮气旋有明显不同;总的次级环流在降水前,有利于天气区不稳定能量的积累,而在降水过程中提供了持续稳定的上升运动条件;急流和暴雨之间通过次级环流存在着正反馈相互作用。

He Peiming,

生态学报 , 1986,
Abstract: The leaf anatomical structures of 75 species of flowering plants were observed to investigate the relationship between those and resistance of plant to air pollution,so as to provide basis for. selecting resistant and sensitive plants. The resistance and sensitivity cf these 75 species, which are common in South China,have learned after fumigation experiments and cultivated experiments in polluted areas of some factories. Several preliminary conclusions have been drawn as follows: (1) Most species with xero...
Design of A 2GHz Low Phase Noise LC VCO
Lu Peiming,Huang Shizhen,Song Lianyi,Chen Run
Lecture Notes in Engineering and Computer Science , 2009,
The Impact of Orographically-Induced Gravity Wave on the Diurnal Cycle of Rainfall over Southeast Kalimantan Island
The Impact of Orographically-induced Gravity Wave on the Diurnal Cycle of Rainfall over Southeast Kalimantan Island

WU Peiming,Jun-Ichi HAMADA,Manabu D YAMANAKA,Jun MATSUMOTO,Masayuki HARA,
WU Peiming

大气和海洋科学快报 , 2009,
Abstract: Precipitation measurements from the TRMM satellite indicate that the southeastern area of Kalimantan (Borneo) Island receives much less rainfall than elsewhere on the island during July to October. Results from surface meteorological observations show that the diurnal cycle of rainfall differs greatly between the eastern and western coasts of the island. Rainfall at the western coast of the island is frequent in the afternoon and evening, whereas almost all rainfall at the eastern coast occurs in the morning. Meanwhile, the GPS-derived precipitable water (PW) at the eastern coast shows a substantial decrease of moisture in the afternoon and evening. Numerical experiments with a mesoscale model reveal that gravity waves driven by diurnal heating of the elevated land surface of the mountains on Sulawesi Island, which lies approximately 300 kilometers to the east of Kalimantan Island, significantly affect the diurnal cycle of rainfall over southeast Kalimantan Island.
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