气象与环境学报2013，Vol.29Issue(1)：12-17,6.DOI:10.3969/j.issn.1673-503X.2013.01.002
一个相对精确计算沙瓦特指数方案的实现
A method for accurate calculation of Showalter index
摘要
Abstract
Since Showalter index is widely applied in convective weather analysis and forecast, it is meaningful to calculate it accurately and rapidly all the time. Based on the rule that equivalent potential temperature is unchangeable during both dry and moist processes, condensation temperature and equivalent potential temperature were calculated using a series of equations provided by David Bolton. Showalter index was computed automatically and accurately by a program in terms of radiosonde data. 11 cases were selected to calculate Showalter index using the new method. Compared with other 5 methods,the new method has characteristics of simple calculation,less average and maximum absolute errors. The possible reasons included two aspects. Many complex derivations and approximation treatments had been avoided. On the other hand,the deduced figures such as the lifting condensation level temperature, the equivalent potential temperature were more accurate than that from other methods. Based on the radiosonde data with MICAPS format from 2010 to 2011 at Hankou station in Hubei province,the forecast accuracy of two methods,namely,a table method and the new method in this paper,was compared for thunderstorm. The results show that the missed number of thunderstorm is reduced if a negative Showalter index is used as a factor to show the possible presence of thunderstorm. In addition,a limitation of the new method is also discussed.关键词
相当位温守恒/沙瓦特指数/计算流程/绝对误差Key words
Conservation of equivalent potential temperature/Showalter index/Calculation process/Absolute error分类
天文与地球科学引用本文复制引用
张端禹,李红莉,叶金桃,李淑玲..一个相对精确计算沙瓦特指数方案的实现[J].气象与环境学报,2013,29(1):12-17,6.基金项目
公益性行业(气象)科研专项"华南持续性暴雨中尺度特征诊断分析和预报技术研究"(GYHY201106003)、国家自然科学基金青年科学基金"江淮梅雨锋暴雨降水日变化的分析与模拟研究"(41105073)和国家自然基金(41105072)共同资助. （气象）
