DocumentCode :
2215931
Title :
Extracting Periodic Components in Temperature Fluctuation Patterns
Author :
Yang, Chunxia ; Wu, Hongfa ; Zhang, Yingchao ; Itoh, Masaru
Author_Institution :
Sch. of Inf. & Control, Nanjing Univ. of Inf. Sci. & Technol., Nanjing, China
fYear :
2009
fDate :
26-28 Dec. 2009
Firstpage :
4873
Lastpage :
4876
Abstract :
Based on monthly average air temperature of Shapingba in Chongqing over the period from 1958 to 2007, the cycles on various scales of temperature fluctuation patterns are analyzed by Empirical Mode Decomposition(EMD). After applying EMD to the data, a series of cycle modes and a trend are obtained respectively, including short periodic oscillations and medium periodic oscillations. Their corresponding average periods are calculated by the Fast Fourier Transform Algorithm (FFT). Those components of periods like 1 year, 1.5 years and 2.78 years belong to the former; while the periods of 7.14 years and 10 years belong to the latter. Besides, the monthly average air temperature in Shapingba of Chongqing took on descending trend before 1984, while ascended since then, which coincide with the previously obtained consequence. All the above results indicate the air temperature fluctuate on various time scales and enlighten us to find its possible reason.
Keywords :
atmospheric movements; atmospheric temperature; climatology; fast Fourier transforms; AD 1958 to 2007; AD 1984; China; Chongqing; EMD; Empirical Mode Decomposition; Fast Fourier Transform Algorithm; Shapingba; average air temperature; cycle modes; medium periodic oscillations; periodic components; short periodic oscillations; temperature fluctuation patterns; Data mining; Density functional theory; Fast Fourier transforms; Fluctuations; Frequency; Information science; Shape control; Sun; Temperature; Time series analysis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Science and Engineering (ICISE), 2009 1st International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-4909-5
Type :
conf
DOI :
10.1109/ICISE.2009.577
Filename :
5454865
Link To Document :
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