基准站垂向周期运动与气象因素的关联性分析

Correlation analysis between vertical periodic motion of reference station and meteorological factors

针对传统相关性分析方法的局限性,提出将交叉小波和小波相干相结合,创建多角度相关性分析方法,用于基准站垂向周期运动与气象因素的关联性分析,以山东省费县观测数据为例,研究了两者之间的关系。交叉小波谱可以表明,费县基准站的垂向周期运动与气象因素之间有明显的1a主共振周期,说明两者之间年周期变化存在联系。同时从小波相干谱中可以了解到,不同的时间段内存在不规则的1/12 a、0.25 a、0.5 a共振周期,但共振周期持续时间较短,说明气象因素会对垂直形变产生影响。此外,交叉小波和小波相干能够在时域和频域中分析两种不同成分的细部相关特征和相位差异,其中相对湿度变化超前垂直变化1/4周期,平均风速变化滞后垂直变化1/8周期,日累计降水变化超前垂直变化1/8周期,日照时数变化滞后垂直变化1/8周期,在基准站垂直形变相关性分析方面具有较好的应用效果。

Aiming at the limitations of traditional correlation analysis methods, this paper proposed to combine cross wavelet and wavelet coherence to create a multi angle correlation analysis method, which was applied to analyze the correlation between the vertical periodic movement of the base station and meteorological factors. Taking the observation data of Feixian County, Shandong Province as an example, the relationship between the two was studied. The cross wavelet spectrum showed that there was an obvious 1a main resonance period between the vertical periodic movement of the Feixian base station and meteorological factors, indicating that there was a relationship between the annual periodic changes of the two. At the same time, it could be learned from the small wave coherent spectrum that there were irregular 1/12a, 0.25 a and 0.5 a resonance periods in different time periods, but the duration of the resonance period was short, indicating that meteorological factors would affect the vertical deformation. In addition, the cross wavelet and wavelet coherence could be explored to analyze the detailed correlation characteristics and phase differences of two different components in the time and frequency domains, in which the relative humidity changed 1/4 cycle ahead of the vertical change, the average wind speed changed 1/8 cycle behind the vertical change, the daily cumulative precipitation changed 1/8 cycle ahead of the vertical change, and the sunshine hours changed 1/8 cycle behind the vertical change, It had a good application effect in the correlation analysis of the vertical deformation of the reference station.