ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Macroscale and Microscale Characteristics of a Process of Cloud and Precipitation in Spring of Henan Province
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
The observations and investigations for macroscale and microscale char acteristics of clouds and precipitations are helpful to establish their typical multiscale patterns and technological system of scientific seeding, and also s upply the important foundations for seeding schemes of precipitation enhancement. Integrated observations for a cloud and precipitation process which occurred in the experiment region of Henan Province (31.5～35°N，111～114°E) on 31 Ma rch, 2004 were carried out by means of radar, satellite, as well as airborne PMS (Particle Measurement System) and GPS (Globe Positioning System), etc. The phys ical properties of this process of cloud and precipitation are analyzed. This ra infall process, ranged from small to middme level, was caused by a typical cold front with a trough. There appeared a front cloud system with a trough at its re ar part from the GEOS satellite image. The cold front at the surface was located at the head of the cloud belt. The PPI (Plan Position Indicator) radar echo dis played a narrow and long echo belt with a not very large intensity, while the RH I (Range Height Indicator) echo showed that the average altitude of cloud top wa s 5～6km. The radar echo was almost uniform except for some individual echo clu sters whose intensity ranged from 20 to 30 dBz, and there was an obvious br ight belt of 0℃. The main clouds formed precipitation were altocumulus (Ac) above th e front and cumulostratus (Sc) below which contained abundant liquid water. The maximum liquid water contents in Ac were 0.072g/m3 and 0.086g/m3 at the height of 4340 m and 3670 m, respectively, where temperatures were -4.8℃ and 0℃, while the maximum liquid water content in Sc under Ac was 9*10-8g?cm- 3 where temperature was 0℃. Before formation of precipitation, the spectral shape of parti cles was singlepeak and the particle diameters varied from 5 to 10 μm. The co ncentration of large particles was very low, less then 0.1cm-3, with an inc ontinuous distribution. With the development of microphysical processe and precipitati on formation, the spectral shape turned to doublepeak or multipeak, and the particle concentrations and their diameters increased obviously.
Keywords:
Project Supported:
Clc Number:
Mobile website
