亞熱帶北海地區(qū)海平面氣壓準(zhǔn)兩年振蕩的變化趨勢(shì)研究
[Abstract]:Because the change of sea level pressure has significant influence on the climatic factors such as temperature, precipitation and wind field, the variation trend of quasi-biennial oscillation of sea level pressure in the subtropical North Sea is studied. It not only has a guiding role in predicting the future changes of weather and climate in the subtropical North Sea region, but also has an important reference value for studying the formation of circulation in the subtropical North Sea region. However, it is difficult to test the significance of the quasi-biennial oscillation of sea level pressure in the North Sea region when the current method is used to study the variation trend of the quasi-biennial oscillation of sea level pressure in the subtropical North Sea. There is a problem of poor resolution of coupled signals, and there are some limitations to signal recognition. This paper presents a wavelet transform based approach to study the variation trend of sea level pressure quasi biennial oscillation in the subtropical North Sea. Firstly, the wavelet power spectrum is used to test the sea level pressure signal in the subtropical North Sea region, and the white noise theoretical power spectrum is calculated to test the significance of the wavelet energy density of the sea level pressure signal in the subtropical North Sea region. Based on the empirical orthogonal function (EOF) analysis of the sea pressure in the subtropical North Sea region for 64 years from 1950 to 2014, the variation trend of the oscillation period of sea level pressure in the North Sea region is determined. The experimental results show that the proposed method can effectively improve the resolution of coupled signals and provide an important theoretical basis for the study of weather processes in the subtropical North Sea region.
【作者單位】: 北海市氣象局;南京信息工程大學(xué)大氣科學(xué)學(xué)院;
【分類號(hào)】:P732
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