지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.4
- 발행연도
- 2009.11
- 수록면
- 423 - 437 (15page)
이용수
초록· 키워드
오류제보하기
The eddy covariance data have been analyzed to examine the spectral feature of canopy turbulence and the role of convection in heat and momentum transfer within open canopies in unstable condition. For this purpose, spectra, cospectra and multiresolution decomposition have been anlayzed. The results show that the normalized power spectra obey closely a -2/3 power law in the upper canopy but they deviate near the bottom. The ratio of transverse to longitudinal spectrum is less than 4/3 in the inertial subrange, indicating that turbulence is anisotropic within the canopy. Convection increases variance and flux over a wide range of frequency, which leads to reduced role of canopy scale eddy in heat and momentum transfer within open canopies in unstable condition compared to stable condition. Fourier analysis and multiresolution decomposition results give the following features of heat and momentum transfer in the lower canopy. Both sweep and boundary layer convection contribute to heat transfer with similar periodicity but with different duration. The momentum transfer is dominated by large-scale gust. And small-scale convection contributes to heat flux but not to significantly momentum flux in small averaging time less than 25 s.
목차
Abstract
1. Introduction
2. Data
3. Method
4. Results
5. Summary
REFERENCES
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UCI(KEPA) : I410-ECN-0101-2009-453-019158821