| Some Problems on the Global Wavelet Spectrum |
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| 作者姓名： | WU Shu LIU Qinyu |
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| 作者单位： | Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory, Ocean University of China, Qingdao 266003, P. R. China |
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| 基金项目： | We would like to thank Professor Zhengyu Liu for his kind advice on wavelet analysis. The NCEP Reanalysis data were provided by the N0AA-CIRES Climate Diagnostics Center, Boulder, Colorado, USA via its Website at http：.//www. cdc. noaa. gov/. This study was supported by a key program from the National Natural Science Foundation of China （NSFC） （Grant No. 40233033）. |
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| 摘 要： | In order to test the validity of the global wavelet spectrum - a new period analysis method based on wavelet analysis, we carried out some simple experiments. In our experiments we used idealized time series and real Nifio 3 sea surface temperature （SST） for testing purposes. First we combined different signals which have the same power but different periods into some new time series. Then we calculated the global wavelet spectra and Fourier power spectra for the testing time series. The testing results revealed that on some occasions the global wavelet spectrum tends to amplify the relative power of longer periods. By making comparisons with the results obtained by the traditional Fourier power spectrum, we demonstrated that on an occasion when the global wavelet spectrum does not work the Fourier power spectrum can be used to achieve the right results. Hence it is recommended that when making period analysis with the global wavelet spectrum one needs to do further tests to confirm their results.
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| 关 键 词： | 微波分析 小波光谱 SST 海洋 |
| 文章编号： | 1672-5182（2005）04-398-05 |
| 收稿时间： | 2005-06-02 |
| 修稿时间： | 2005-08-26 |
Some problems on the global wavelet spectrum |
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| WU Shu LIU Qinyu.Some Problems on the Global Wavelet Spectrum[J].Journal of Ocean University of China,2005,4(4):398-402. |
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| Authors: | Wu Shu Liu Qinyu |
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| Institution: | Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory, Ocean University of China, Qingdao 266003, P.R. China |
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| Abstract: | In order to test the validity of the global wavelet spectrum - a new period analysis method based on wavelet analysis, we carried out some simple experiments. In our experiments we used idealized time series and real Nino 3 sea surface temperature (SST) for testing purposes. First we combined different signals which have the same power but different periods into some new time series. Then we calculated the global wavelet spectra and Fourier power spectra for the testing time series. The testing results revealed that on some occasions the global wavelet spectrum tends to amplify the relative power of longer periods. By making comparisons with the results obtained by the traditional Fourier power spectrum, we demonstrated that on an occasion when the global wavelet spectrum does not work the Fourier power spectrum can be used to achieve the right results. Hence it is recommended that when making period analysis with the global wavelet spectrum one needs to do further tests to confirm their results. |
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| Keywords: | wavelet analysis global wavelet spectrum long period amplification Fourier power spectrum |
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