摘要
为探究20世纪末平流层气候变化在冬季各月的差异,本文选用逐日ERA5和NCEP/NCAR资料,从极涡强度和行星波强迫方面研究平流层的年代际变化,并重点关注1、2、3波分别的贡献。研究发现,12月由行星波1波主导,1波的上传在中高纬度平流层显著增加,2波仅在中纬度平流层上传减弱;2月行星波1波仅在极区低平流层上传减少,但2波的上传在中高纬度平流层显著减弱。3波主要使沿低纬度波导的传播在12月减弱,在2月增强。进一步分析表明,行星波上传的变化会影响平流层极涡的变化,主要体现在12月极地波导增强使得极涡减弱,极区平流层增暖,平均纬向风减速;2月极地波导减弱使得极涡加强,极区平流层降温,平均纬向风加速。
To investigate the differences in stratospheric climate changes during various winter months at the end of the 20th century,the daily ERA5 and NCEP/NCAR data was used to study the decadal changes of the stratosphere in terms of polar vortex intensity and planetary wave forcing,with a particular focus on the contributions of wave 1,wave 2,and wave 3.Results found that in December,wave 1 dominated,with an increased upward propagation of wave 1 in the mid-to-high latitude stratosphere and a weakened upward propagation of wave 2 only in the mid latitude stratosphere.In February,wave 2 predominated,with a significant weakening of its upward propagation in the mid-to-high latitude stratosphere and a decrease in the upward propagation of wave 1 only in the polar region low stratosphere.Wave 3 primarily led to a weakening of propagation along low latitude waveguides in December and an enhancement in February.Further study indicated that the changes in planetary wave propagation associated with the polar vortex in the stratosphere.In December,along with the strengthened propagation along polar waveguides,the polar vortex weakened,warmed,and the mean zonal wind decelerated.In February,with the weakened propagation along polar waveguides,the polar vortex strengthened,cooled,and the mean zonal wind accelerated.
作者
徐凡森
吴国华
刘仁强
杨婷
XU Fansen;WU Guohua;LIU Renqiang;YANG Ting(Anhui meteorological Observatory,Hefei 230031,China;Shaanxi meteorological Observatory,Xi'an 710014,China;State Key Laboratory of Environment Characteristics and Effects for Near-space,Nanjing University of Information Science and Technology,Nanjing 210044,China;Dayao meteorological Observatory,Yunnan Chuxiong Yi minority Autonomous Prefecture 675400,China)
出处
《气象科学》
2025年第3期378-384,共7页
Journal of the Meteorological Sciences
基金
广东省重点领域研发计划项目(2020B1111200001)。
关键词
平流层
行星波
傅里叶分析
年代际变化
stratosphere
planetary wave
Fourier analysis
decadal change
作者简介
通信作者:刘仁强,rq_liu@nuist.edu.cn。
