On the couplings between chebyshev coefficients as derived from the monthly mean geopotential fields at 500 hPa over East Asia and the Southern Oscillation期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

On the couplings between chebyshev coefficients as derived from the monthly mean geopotential fields at 500 hPa over East Asia and the Southern Oscillation

Authors:	Chen Wanlong Chu Pao-Shin

Affiliation:	Department of Meteorology, Nanjing Institute of Meteorology, Nanjing 210044,Department of Meteorology, University of Hawaii, Honolulu, Hawaii 96822, U.S.A.

Abstract:	The first six Chebyshev polynomial coefficients (i.e.,A ₀₈,A ₀₁,A ₁₀,A ₁₁,A ₀₂, A₂₀) were derived from monthly mean geopotential height over East Asia for the period 1951–1983. Spectral analysis of these coefficients reveals relative maxima of power in the frequency bands of 200 months (≈ 16.7 years), 25 months (the quasi-biennial oscillation), 5–6 months, and 2–3 months. Cross-spectral characteristics between Chebyshev coefficients and the Southern Oscillation Index (SOI) were also explored. Coherence spectrum for the zonal and meridional circulation index (A ₀₁ andA ₁₀) with the SOI was significant near 4 years, the QBO, and 2–3 months. Some physical explanations were offered for the spatial linkages (i.e., teleconnections) between the SO and atmospheric circulation anomalies over East Asia.

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