Abstract: An analysis and study of icing physics and conditions are made. Experiments and comparisons of different icing algorithms are performed. An operational icing potential forecasting technique is developed with MM5 numerical model. An objective verification is conducted by using observed pilot reports of icing and operational modeloutput. The results show that the probability of detection is up to 81%.
Abstract: In view of the mechanism of development of severe convective storms , the physical concepts and the calculating methods of several convective parameters related with buoyant energy and vertical wind shear are introduced. A case is studied in detail.The results indicate that some parameters may serve as forecaster parameters for severe convective storms.
Abstract: SBDART is a popular model to compute plane-parallel radiative transfer in recent years. The model is designed for the analysis of a wide variety of radiative transfer problems encountered in satellite remote sensing and atmospheric radiation energy balance studies. The program is based on a collection of well tested and advanced physical models, which were developed over the past few decades in research practice. The function and structure of SBDART are introduced briefly in the paper. The SBDART model is combined with satellite data to obtain optical thickness of cloud and cloud drop effective radius, as well as extinction efficiency, in this way, recognition of aircraft icing is realized.
Abstract: To make an investigation into cotton bollworm in the delta region of the Yellow River, the influence of the meteorological conditions upon its growing and the birth of the fifth generation cotton bollworm is analized. On these bases,the forecast equation for the fifth generation is established.
Abstract: Based on the data of Jun.-Sep. temperature for Dinghai from 1954 to 2000, the climate characteristics of high temperature weather in Zhoushan City is analyzed, and the period of annual oscillation of high temperature is found.The strong or weak of subtropical high and their positions are well associated with the high temperature weather.The other factors influence the high temperature weather by affecting the strength and position of the subtropical high.
Abstract: One key technique of precipitation enhancement by AgI generator established at the windward side of the hill is to choose the occurring and lasting time of updrafts,which affect the rate of the valid nuclei into clouds.The feasibility of precipitation enhancement by AgI generator on the ground is analyzed.Using synoptic chart,satellite cloud picture,radar echo,and precipitation parameters,the technique of determining operating opportunity is discussed.
Abstract: Based on the satellite images and synoptic charts and the radar(CINRAAD/CC) data of a heavy snow in southwestern of Hei Longjiang Province on December 12, 2001 ,the snowing weather process is analyzed. The result shows that the characteristics, such as the inhomogeneity of reflectivity, low level jet in speed field and two layer structure in height field can be obtained with the new generation weather radar ,as well as the difference of radar echoes of snow and rain is compared.
Abstract: Using the data of precipitation in Weihai in winter from 1980 to 1999(Nov.-Feb.), the statistical characteristics of heavy snows are obtained. In these years, there were 21 heavy snows,average 1.0 heavy snows a year. The area of heavy snows is generally smaller, and the possibility of heavy snows over two meteorological observing stations or more is only 0.29. The uneven distribution of heavy snows is in association with the meteorological observing station's location. Most of heavy snows occurred in Wengdeng (average 0.7 heavy snow a year) while the least in Rushan(only one time in these years). The weather systems which caused heavy snows can be divided into two patterns: northeast cold vortex or trough line, and south trough line. The probability of the cold vortex accounts for 95.2%. It is predominant and the vortex caused 20 heavy snows in these years.
Abstract: Based on NOAA- AVHRR data from 1996 to 1999,the relation between the dry index of vegetation and relevant data of forest fire in Fujian Province is studied. It is indicated that the scope distribution of forest fire ranks in Fujian Province could be premonitored according to the geographic location of forest fire by GIS system.
