Vol.11, NO.1, 2000

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ATMOSPHERIC ADVECTIVE AND DISPERSION NONSTATIC BOX-MODEL FOR PREDICTION OF THE POTENTIAL INDEX OF AIRBORNE POLLUTANT
Xu Dahai, Zhu Rong
2000, 11(1): 1-12.
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Abstract:
Besed on the integration of the atmospheric advective and dispersion equation, a nonstatic box-model is built up which has memory of previous concentration and may be sensitive to nonadjacent boxes. The frame of the model could be used for prediction of air pollution on various scales. The airborne pollutant potential index (PPI), which has obvious physical meaning, is also defined to representthe ability to dilute the air pollutants by atmospheric advection and dispersion and/or to clean them out by dry and wet sedimentation. PPI could be used in the nonstatic box-model for prediction of the polluted potential in atmosphere. Furthermore, the prognostic formula and procedure for prediction of pollutant standard index (PSI) are given which depend flexibly on the monitored source strength and/or concentration distribution. Using the regular concentration data, the prediction procedure is tested and the results are acceptable.
EFFECTS OF ENVELOPE OROGRAPHY AND GRAVITY WAVE DRAG ON PERFORMANCE OF CLIMATE MODELING
Qian Yongfu
2000, 11(1): 13-20.
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Abstract:
The Nju-PσM is used to study the effects of envelope orography and gravity wave drag on July climate modeling. The results of analysis and comparison show that envelope orography and gravity wave drag could improve the modeling performance to some extent and result in more realistic simulations.
THE PRE-PROCESSING OF DOPPLER RADAR WIND RETRIEVAL VAP TECHNIQUE
Bai Jie, Tao Zuyu
2000, 11(1): 21-26.
[FullText HTML] (674) [PDF 167KB](1760)
Abstract:
Based on the analysis of three kinds of wind retrieval techniques with Doppler radar, Velocity Azimuth Processing (VAP) technique is considered to be used in operation in the near future, and the key of which is whether the wind field information on meso-β scale and larger scale is filtered out from initial data, in order to eliminate the influences of the wind field information smaller than meso-V scale on retrieval results. Therefore, the pre-processing of data is made using 2-D low pass filter method. In addition, the wind velocity computational formula of VAP method is improved.
THE HOMOGENEITY TEST ON MEAN ANNUAL WIND SPEED OVER CHINA
Liu Xiaoning
2000, 11(1): 27-34.
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Abstract:
The homogeneity test is carried out using mean annual wind speed series over China from 1951 to 1990. The results indicate that Standard Normal Homogeneity Test (SNHT) method could be applied to the homogeneity test on wind speed. The data quality of mean annual wind speed series is basically reliable. The significant inhomogeneity is related to instrument change.
RESEARCH ON THE ADJUSTMENT OF INITIAL VALUE IN MOISTURE FIELD AND ITS CONTRIBUTION TO RAINFALL PREDICTION OVER SOUTH CHINA
Chang Yue, Xue Jishan, He Jinhai
2000, 11(1): 35-46.
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Abstract:
By using the heating rate, which was calculated from the precipitation data derived from the GMS multichannel meteorological satellite, as the non-adiabatic forcing term of the non-adiabatic nonlinear normal-mode initialization process, the initial values of wind field were adjusted. And then using a counter operation scheme, which was contrary to the model's convective parameterization scheme, the initial values of the moisture field were adjusted to be sure that the heating rate calculated from the model′s physical parameterization scheme was in accordance with the heating rate derivde from the meteorological satellite. The method, which was in the frame of non-adiabatic nonlinear normal-mode initialization, had the initial vapor field adjusted. Not only has it achieved the goal of the traditional initialization, but also improved the model′s capability of the short-time prediction to precipitation. The results of two trials in South China indicate that the method is valid.
EXPERIMENTAL RESEARCH ON RICE PLANTING AREA OF HILLY REGION IN SOUTHERN CHINA USING REMOTELY SENSED DATA
Lai Geying, Yang Xingwei
2000, 11(1): 47-54.
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Abstract:
Taking Zhejiang Province as the experimental area, the experimental research on rice planting area of hilly region in southern China is carried out by using NOAA/AVHRR data. The main contents concern the contrast tests on the practical approaches. Both digital elevation model (DEM) and digital slope model (DSM) derived from the digital relief map are used for the purpose of improving the classification accuracy of AVHRR data in large-area hilly region. The results show that the accuracies of maximum-likelihood (MLH) classification could satisfy the professional requirements of estimating rice planting area, and fuzzy supervised classification (FSC) has better classification accuracy and stability than that of MLH. In addition, DSM may improve the results of extracting paddy field signatures from AVHRR, particularly may improve the spatial precision.
THE DEVELOPMENT OF METEOSAT-5 HRI DATA RECEIVING AND PROCESSING SYSTEM
Xu Jianping, Yang Jun, Yang Guohong, Yue Jiangshui, Wei Caiying, Jia Shubo, Long Xiangrong
2000, 11(1): 55-61.
[FullText HTML] (268) [PDF 356KB](1328)
Abstract:

To receive HRI data of Meteosat-5 satellite located at 63°E, the HRI data receiving and processing system has been developed. The system has been put into operation and its products are being disseminated to users via 9210 VSAT system. In addition, the configuration, features and experimental results of the system are described.
INFLUENCES OF IMPROVED SURFACE PARAMETERS ON T106 MODEL
Li Yue′an, Huangfu Xueguan
2000, 11(1): 62-70.
[FullText HTML] (517) [PDF 225KB](1371)
Abstract:
Based on the data of soil humidity, vegetation of ISLSCP and the snow cover, SST of NOAA through modifying the surface parameters of T106 model and surface flux scheme, the influences of these surface parameters on the forecast effcet of T106 model are studied. The experiments indicate that the surface parameters and new scheme could improve the forecast of T106 model, espcially the forecast of subtropical high. For example, the forecasts of experiment schemes for the west-extending ridge point index, area index and intensity index of subtropical high are better than those of operational prediction.
3-D NUMERICAL SIMULATION ON THE CHARACTERISTICS OF ECOLOGICAL BOUNDARY LAYER FOR AGROFOREST ECOSYSTEM
Li Xunqiang, Wang Hanjie
2000, 11(1): 71-79.
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Abstract:
A 3-D eco-boundary layer model including to pography and vegetation effect is proposed. In comparison with the traditional meteoro logical model of boundary layer, the thermal as well as dynamic effects are considered more detailed such as the solar radiation extinction with vegetation canopy, the evaportranspiration of water vapor with stomata of leaves, heat transfer with different kinds of soils during the growing process of agroforest plants. The simulated results of the model are in good agreement with the observational data in regard to the special agroforest ecosystem in the central area of Huang-Huai-Hai plain of China.
THE VICARIOUS CALIBRATION FOR WATER VAPOR CHANNEL OF SPIN STABILIZATION GEOSTATIONARY METEOROLOGICAL SATELLITE
Wang Ping, Qiu Kangmu
2000, 11(1): 80-87.
[FullText HTML] (568) [PDF 171KB](1453)
Abstract:
By using the radio sonde data and Lowtran 7, the radiance is calculated, and the calibration coefficients of FY-2 and GMS-5 water vapor channels are fitted. During the period of around equinox eclipse, the temperature on satellite would change rapidly, and the vicarious calibration combining with in-flight calibration would be considered. The validations are made using radiosonde data and GMS-5 observational values. The vicarious calibration has got a good result in the operations for half a year.
STUDY ON THE FEATURES OF FLOOD/DROUGHT AND ACTIVITIES OF TYPHOONS OVER EAST CHINA SEA AND THEIR LINKAGE TO ENSO IN WARM/COOL SUMMERS
Chen Qianjin, Zhao Zhenguo, Wang Lihua
2000, 11(1): 88-94.
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Abstract:
By using the data of temperature, precipitation and typhoon year book from 1951 to 1995, the warm and cool summers are defined and identified, and features of monsoon rainband distribution and the abnormal activities of typhoons over the East China Sea as well as their linkages to ENSO are statistically analyzed. The results show that the activities of typhoons and the monsoon rainband distribution in warm summers are very different from those of cool summers. Meanwhile, the SSTA over equatorial Pacific exhibits distinctively contrast during warm summers and cool summers. In addition, the physical concept model about the teleconnection is given.
THE MULTI-TIME SCALE VARIATIONS OF SUMMER MONSOON OVER SOUTH CHINA SEA AND ITS INTERACTION WITH SST ANOMALY
Liang Jianyin, Wu Shangsen
2000, 11(1): 95-104.
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Abstract:
Using reanalyzed data of NCEP and observational data of OLR and SST, the features of multi-time scale variations of summer monsoon are studied, and the differences of the atmospheric circulation between strong and weak summer monsoon years are analyzed. It is shown that there exists obvious interplay between the summer monsoon variation over the South China Sea and SST, and meanwhile the variation of SST has a certain effect on summer monsoon.
LAGRANGE METHOD USED IN ATMOSPHERIC MOTION OF STRATOSPHERE
Cheng Xinxi, Lu Hancheng, Zhou Zugang, Fan Hongjun
2000, 11(1): 105-114.
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Abstract:
The applying and modifying study on the Lagrange method is carried out. The results show that the Lagrange method on the isentropic surface gives the best effect, and the variation of the material contour can be studied more finely using the modified Lagrange method. Based on the experiments, the transport of the water vapor in the case during the period of Changjiang-Huaihe Basin Meiyu in July 1991 is diagnosed. The analyses show that the vapor is mainly transported from the South China Sea and the Bay of Bengal, and the latter is stronger.
RELATIONSHIP BETWEEN ENSO EVENTS AND WINTER TEMPERATURE ANOMALY IN YUNNAN
Xie Ming′en, Zhang Wancheng
2000, 11(1): 115-122.
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Abstract:
The influences of 11 El Niño and 8 La Niña events since 1961 on winter temperature variation in Yunnan have been analyzed. It is found that the winter temperature in Yunnan is higher (lower) in El Niño (La Niña) years, which has warm (cold) winter feature, and is more obvious in eastern, middle and southern Yunnan. The sea surface temperature a nomaly (SSTA) over the equatorial East Pacific has the positive significant correlation with winter temperature a nomaly in Yunnan, and monthly SSTA in the previous year has better positive correlation with temperature anomaly of Yunnan in January of the next year. The SST positive (negative) anomaly is a strong signal of warm (cold) winter in Yunnan. Under the influence of ENSO, the weak (strong) winter monsoon over East Asia is the main cause of warm (cold) winter in Yunnan.
ANALYSIS AND FORECAST ON FOG FORMATION IN BEIJING AREA
Wu Hong, Liu Chongjian, Shao Jie, Wang Xiaoming
2000, 11(1): 123-127.
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Abstract:
According to the records of fog in the Capital Airport during the period of 1958 to 1994, the statistical climate characteristics of fog occurring in Beijing area are analyzed. The observing data and the physical fields before fog are calculated and a nalyzed, and a method for short-range forecasting fog is provided. The method is verified during July 1-Nov.30, 1998 with high accurate rate of forecasting. The route of step-predicting guideline on fog is suggested.
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