| Comparative analysis of temperature and CO_2 fluxes for winter wheat in Tibetan Plain and North China Plain using the EMD method |
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| 引用本文： | JIANG Zhaoyang,YU Qiang,LEI Shuhe,WANG Tianduo,SUN Xiaomin and ZHANG Renhua ( Chinese Academy of Meteorological Science,Beijing 100081,China, Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China, Mathematics Department,Ocean University of China,Qingdao 266071,China, Shanghai Institute of Plant Physiology and Ecology,Chinese Academy of Sciences,Shanghai 200032,China). Comparative analysis of temperature and CO_2 fluxes for winter wheat in Tibetan Plain and North China Plain using the EMD method[J]. 自然科学进展(英文版), 2006, 16(10). DOI: 10.1080/10020070612330111 |
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| 作者姓名： | JIANG Zhaoyang YU Qiang LEI Shuhe WANG Tianduo SUN Xiaomin and ZHANG Renhua ( Chinese Academy of Meteorological Science Beijing 100081 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Mathematics Department Ocean University of China Qingdao 266071 China Shanghai Institute of Plant Physiology and Ecology Chinese Academy of Sciences Shanghai 200032 China) |
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| 作者单位： | Chinese Academy of Meteorological Science，Beijing 100081，China; Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，Beijing 100101，China; Mathematics Department，Ocean University of China，Qingdao 266071，China; Shanghai Institute of Plant Physiology and Ecology，Chinese Academy of Sciences，Shanghai 200032，China |
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| 摘 要： | Comparative study of spectral properties of temperature and CO2 fluxes measured by eddy covariance method at Yucheng (36°57'N, 116°36'E, 28 m a.s.l., in the North China Plain) and at Lhasa (29°41'N, 91°20'E, 3688 m a.s. 1., on the Tibetan Plateau) is described using the empirical mode decomposition (EMD) method. The main results are: (1) The intrinsic oscillation modes or intrinsic mode functions (IMFs) were extracted from data of temperature ( T) and CO2 fluxes (F) measured at Yucheng ( T1 and F1) and Lhasa ( T2 and F2) . (2) Hilbert transform was applied to these IMF components, then the Hubert-Huang spectra and the marginal spectra of these data were obtained. (3) Comparison of temperature and CO2 fluxes in North China Plain and on Tibetan Plain illustrated that the characteristic frequencies corresponding to T1, F1, T2 and F2 are 0.05 Hz, 0.03 Hz, 0.014 Hz and 0.005 Hz, respectively.
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Comparative analysis of temperature and CO2 fluxes for winter wheat in Tibetan Plain and North China Plain using the EMD method |
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| JIANG Zhaoyang,YU Qiang,LEI Shuhe,WANG Tianduo,SUN Xiaomin,ZHANG Renhua. Comparative analysis of temperature and CO2 fluxes for winter wheat in Tibetan Plain and North China Plain using the EMD method[J]. Progress in Natural Science, 2006, 16(10). DOI: 10.1080/10020070612330111 |
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| Authors: | JIANG Zhaoyang YU Qiang LEI Shuhe WANG Tianduo SUN Xiaomin ZHANG Renhua |
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| Abstract: | Comparative study of spectral properties of temperature and CO2 fluxes measured by eddy covariance method at Yucheng (36°57'N, 116°36'E, 28 ma. s. l., in the North China Plain) and at Lhasa (29°41'N, 91°20'E, 3688 ma. s. l., on the Tibetan Plateau) is described using the empirical mode decomposition (EMD) method. The main results are: (1) The intrinsic oscillation modes or intrinsic mode functions (IMFs) were extracted from data of temperature (T) and CO2 fluxes (F) measured at Yucheng (T1 and F1) and Lhasa ( T2 and F2). (2) Hilbert transform was applied to these IMF components, then the Hilbert-Huang spectra and the marginal spectra of these data were obtained. (3) Comparison of temperature and CO2 fluxes in North China Plain and on Tibetan Plain illustrated that the characteristic frequencies corresponding to T1, F1, T2 and F2 are 0.05 Hz, 0.03 Hz, 0.014 Hz and 0.005 Hz, respectively. |
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| Keywords: | empirical mode decomposition (EMD) intrinsic mode function (IMF) flux Hilbert transform wheat Tibet |
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