张少波,吕世华,赵勇,杨显玉. 2019. 基于风场季节变率的高原季风指数算法的改进及对比[J]. 气象学报, (0):-, doi:10.11676/qxxb2019.019
基于风场季节变率的高原季风指数算法的改进及对比
An improvement of the Plateau monsoon index based on the wind dynamical normalized seasonality and its comparison
投稿时间:2018-01-23  修订日期:2018-09-18
DOI:10.11676/qxxb2019.019
中文关键词:  高原季风指数,夏季降水,指数对比
英文关键词:Plateau monsoon index, Summer precipitation, Index comparison
基金项目:高原大气与环境四川省重点实验室开放课题(PAEKL-2018-Y2),国家自然科学基金项目(41775016,41875102),成都信息工程大学引进人才启动项目(KYTZ201737)
作者单位E-mail
张少波 成都信息工程大学 zsb@cuit.edu.cn 
吕世华 成都信息工程大学 slu@cuit.edu.cn 
赵勇 成都信息工程大学 zhaoy608@cuit.edu.cn 
杨显玉 成都信息工程大学 xyang@cuit.edu.cn 
摘要点击次数: 42
全文下载次数: 33
中文摘要:
      关于高原季风,现有研究中分别从近地层的热低压、气旋式环流切变以及风场的涡度和散度等角度定义了高原季风指数,但现有指数均更多的关注高原空间场的对比,而没有考虑风场的冬夏转换特征。目的:因此在之前的工作中,基于风场季节变率指数,从高原近地层冬夏风场对比的角度定义了一种新的高原季风指数,这里主要对该指数进行改进和简化,以有利于其的进一步推广。资料和方法:为了验证改进的效果,使用ERA-interim再分析数据计算高原季风指数,并比较了不同高原季风指数年变化和年际变化的差异及其与夏季降水相关关系的差异。结论:结果表明:(1)改进后的高原季风指数物理含义清楚,弥补了原指数计算复杂的缺点。(2)物理基础的差异使得新指数在8月份达到峰值,不同于其他指数在6月份达到峰值,但整体而言,不同高原季风指数和高原降水的年变化特征均有较好的一致性。(3)新指数能够较好的表征高原季风与高原夏季降水东西反相的相关系数分布特征,且不同于其他指数在高原一致的相关系数分布特征,对于高原地区降水,尤其是高原东南部人口相对密集地区的降水预测具有较好的指示意义。
英文摘要:
      When considering Tibetan Plateau (TP) monsoon, different TP monsoon indexes have been defined from many angels, such as the near surface layer thermal low, the cyclonic circulation shear, the wind field vorticity and divergence. However, the existing indexes are more concerned on the space field contrast, without considering the wind field transform characteristics between the summer and winter. Based on this consideration, the difference of 600hPa wind field between the summer and winter is defined as a new TP monsoon index using the wind dynamical normalized seasonality in the author’s previous work. Improvement and simplification of the new index was done in this paper. After calculated using ERA-interim reanalysis data, six different TP monsoon indexes were compared in annual variation, inter-annual variation, and their correlation coefficient with summer precipitation. The results showed the arithmetic of new TP monsoon index is simple but with clear physical meaning. The difference in physical fundamentals caused the new TP monsoon index to peak in August, unlike other indexes that peaked in June. But on the whole, the annual variation characteristics of different monsoon indexes and precipitation show good consistency. The correlation coefficient between the new TP monsoon index and summer precipitation shows an opposite distribution between the western and eastern TP, while a consistent positive correlation coefficient distribution could be found on the TP between other existing TP monsoon indexes and summer precipitation. Above all, the new TP monsoon index showed a satisfactory result especially in the southeastern part of TP where more human live, showing its potential application value in the summer precipitation prediction.
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