1979～2013年西北太平洋地区海平面气压场季节转换时间的变化分析

发布时间：2018-03-21 15:03

本文选题：海平面气压场　切入点：纬向气压差　出处：《气候与环境研究》2016年02期 　论文类型：期刊论文

【摘要】：采用1979~2013年NCEP/NCAR再分析资料,借助线性趋势、距平、累积距平、Mann-Kendall突变检验及Morlet小波等方法分析了西北太平洋地区海平面气压场季节转换时间的长期趋势和多尺度周期变化特征。结果表明:海平面气压场一年中存在两次季节转变,20°N~50°N海平面气压场冬夏季节转变的时间在第20候左右,而夏冬季节转变发生在第51候。并且海平面气压场的季节转换时间存在纬度差异与经度差异。通过趋势分析,发现海平面气压场由冬季型转变到夏季型的时间存在显著的趋势变化,并且在近35年内是趋于提前,其气候倾向率为-0.33候/10 a;夏季型转换为冬季型的时间趋于延后,气候倾向率为0.25候/10 a。季节转换时间的Mann-Kendall突变检测结果表明,海平面气压场由冬向夏的转换时间在1997~1998年间发生了突变;夏季型转换为冬季型的时间尚未发现显著突变。最后通过对季节转换时间的小波分析与小波功率谱的显著性检验得出,冬夏季节转换的时间具有显著的15 a周期变化;夏冬季节转换时间8 a周期振荡最为剧烈。
[Abstract]:Using the NCEP/NCAR reanalysis data from 1979 to 2013, with the aid of linear trend, the anomaly, The Mann-Kendall mutation test of cumulative anomaly and Morlet wavelet method are used to analyze the long-term trend of seasonal transition time and multi-scale periodic variation of sea level pressure field in the Northwest Pacific Ocean. The results show that the sea level pressure field exists in one year. The time of winter and summer seasonal change of sea level pressure field at 20 掳N ~ (50 掳N) is about the 20th. However, the summer and winter seasonal transition occurred in the 51st climate, and the seasonal transition time of sea level pressure field was different in latitude and longitude. It is found that the time of sea level pressure field changing from winter to summer tends to advance in the last 35 years, and its climatic tendency rate is -0.33 h / 10 a, and the time of transition from summer to winter tends to be delayed. The results of Mann-Kendall mutation analysis show that the transition time of sea level pressure field from winter to summer changed from 1997 to 1998. No significant mutation has been found in the transition time from summer to winter. Finally, the wavelet analysis of seasonal transition time and the significance test of wavelet power spectrum show that the seasonal transition time of winter and summer has a significant 15-year cycle change. The summer and winter seasonal transition time oscillates most intensely in 8 a period.
【作者单位】：广州大学地理科学学院;
【基金】：国家自然科学基金项目51210013~~
【分类号】：P732

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