摘要
采用正压准地转模式作为动力核，用Ｒｏｓｓｂｙ—Ｈａｕｒｗｉｔｚ波函数作为理想场，同时使用回溯时间积分格式和普通中央差格式进行数值试验。结果表明，在短时积分的情况下，回溯格式能减小数值解误差１～２个量级，而且它对时间步长的增大不敏感。因此使用回溯格式可以减少积分计算量，延长积分时效。
Adopting the barotropical quasi-geostrophic model as a dynamic kernel and taking Rossby-Haurwitz wave as an idealized field, numerical weather forecast experiments were carried out by means of both retrospective time integration scheme and leapfrog one. Results show the former can reduce the forecast error at 10-1-10-2 in comparison with the latter in case of 1h to 24h lead. Moreo- ver, the retrospective scheme is little sensitive to the time-step extending. Therefore, the computational amount for numerical integrations can be saved and valid prediction time can be enlarged when using the retrospective scheme.
出处
《大气科学》
CSCD
北大核心
2002年第2期249-254,共6页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目 49875025和49975017
