不同垂直坐标系对垂直速度计算的影响

李兴良; 陈德辉; 沈学顺

不同垂直坐标系对垂直速度计算的影响

中国气象科学研究院, 北京, 100081

基金项目: 国家"十五"重点科技攻关项目《中国气象数值预报系统技术创新研究》(2001BA607B02);中国气象科学研究院《地形影响问题的研究》(7048/2002-9y-1)资助

计量
- 文章访问数: 925
- HTML全文浏览量: 11
- PDF下载量: 4024
- 被引次数: 0
出版历程
- 收稿日期: 2004-01-28
- 修回日期: 2004-06-22

IMPACT STUDY ON THE CALCULATION OF VERTICAL VELOCITY IN DIFFERENT VERTICAL COORDINATES

Chinese Academy of Meteorological Science, Beijing 100081, China

摘要

摘要: 近年来,随着高精度中尺度数值预报模式和多尺度统一模式的发展,与之相关的一些非静力中尺度模式技术也随之提了出来,垂直坐标系的影响问题就是其中之一。本文借助于高精度美国新一代数值预报模式WRF(Weather Reseachand Forecast),模拟分析了两种不同的坐标系对模式大气中垂直速度计算的影响。试验结果表明,不同的坐标系对大气垂直速度大小计算存在着差异,特别是当分辨率提高时,不同垂直坐标系对大气垂直结构的刻画的差别更加明显。由于垂直速度与降雨过程密切相关,垂直速度的计算差异必然影响模式对降雨过程的描述。理想试验结果表明,在气压地形追随坐标中气压梯度力的计算对地表气压计算很敏感。
- 数值预报模式 /
- 坐标系 /
- 垂直速度 /
- 气压梯度力
Abstract: With the development of high-resolution and multi-scale unified numerical model, some of techniques about non-hydrostatic meso-scale numerical weather prediction are addressed. The impact of the vertical coordinate system is one of them. In this paper, based on a WRF (Weather Research and Forecast) model, the impact on the calculation of vertical velocity was studied with different vertical coordinates. The simulation results showed that the calculation of vertical velocity is sensitive to vertical coordinates. It is especially more evident when the resolution increased. Due to the close relationships between vertical velocity and precipitation, the difference of vertical velocity inevitably influences model's description of precipitation. An ideal experiment exhibits that pressure gradient force computations in the pressure terrain-following coordinate are sensitive to surface pressure.
- numerical prediction model /
- coordinate system /
- vertical velocity /
- pressure gradient force

HTML全文

参考文献(12)

[1]	RICHARDSON L F. Weather prediction by numerical process[M]. New York: Cambridge University Press,1965. 236.
[2]	ELIASSEN A. The quasi-static equations of motion with pressure as independent variable[J]. Geofys Publikasjoner, 1949,17(3): 44.
[3]	PHILLIPS N A. A coordinate system having some special advantages for numerical forecasting[J]. J Meteor, 1957,14(2): 184-185.
[4]	SANGSTER W E. A method of representing the horizontal pressure force without reduction of station pressures to sealevel[J]. J Meteorol, 1960, 17(2): 166-176.
[5]	Gal-chen T, SOMERVILLE R C J. On use of a coordinate transformation for the resolution of the Navier-Stokes equation[J] .J Comput Phys, 1975, 17(2): 209-228.
[6]	MESINGER F. A blocking technique for representation of mountains in atmospheric models[J]. Riv Meteor Aeronautica,1984, 44(2): 195-202.
[7]	RENE Laprise. The euler equations of motion with hydrostatic pressure as an independent variable[J]. Mon Wea Rev, 1992,12(2): 197-207.
[8]	赵鸣. 低纬边界层顶垂直速度的计算[J]. 热带气象学报, 1997, 13(1): 88-91.
[9]	ARIRA Kasahara. various vertical coordinate systems used for numerical weather prediction[J]. Mon Wea Rev, 1974, 102(5): 509-522.
[10]	廖洞贤,王两铭. 数值天气预报原理及其应用[M]. 北京: 气象出版社, 1986. 29-31.
[11]	王兴宝,张维桓. 地形激发斜压波动的数值研究[J]. 热带气象学报, 1995, 11(2): 150-161.
[12]	吕美仲,彭永清. 动力气象学教程[M]. 北京: 气象出版社, 1990. 53-54.