| 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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| 作者姓名： | JIANG Zhaoyang YU Qiang LEI Shuhe WANG Tianduo SUN Xiaomin ZHANG Renhua |
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| 作者单位： | 1. Chinese Academy of Meteorological Science, Beijing 100081, China; 2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 3. Mathematics Department, Ocean University of China, Qingdao 266071, China; 4. 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.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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| 关 键 词： | empirical mode decomposition (EMD) intrinsic mode function (IMF) flux Hilbert transform wheat Tibet. |
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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| Authors: | JIANG Zhaoyang YU Qiang LEI Shuhe WANG Tianduo SUN Xiaomin ZHANG Renhua |
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| Institution: | 1. Chinese Academy of Meteorological Science, Beijing 100081, China; 2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 3. Mathematics Department, Ocean University of China, Qingdao 266071, China; 4. Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China |
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| Abstract: | |
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| Keywords: | empirical mode decomposition (EMD) intrinsic mode function (IMF) flux Hilbert transform wheat Tibet |
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