Dominate time scale characteristics of the turbulence across canopy-atmosphere interface of a mixed broadleaved-Korean pine forest in Changbai Mountains

Abstract

The measurement and observation for this study were carried out at Forest Ecosystem Opened Research Station of Changbai Mountains (128°28′E and 42°24′ N, Jilin Province, P. R. China). Characteristics of Dominant time scales (DTSes) and dominant time scales contribution ratios (DCRs) across canopy-atmosphere interface and controlling factors were analyzed with multi-scale method. DTS of stream wise and lateral velocity components were larger than that of vertical velocity component. While DCR of vertical velocity component was larger than that of the stream wise and lateral velocity components. Effect of atmospheric stability on DCR and DTS was nonlinear. DTS under unstable conditions was larger than that under stable conditions; DTS and DCR were determined upon the original scales characteristics of upwind flow under strong stability. Canopy structure would influence DTS and DCR across canopy-atmosphere interface remarkably.

Keywords

Canopy-atmosphere interface / Multi-scale / Atmospheric stability / Dominate time scale / S718.51 / A

References

[1] Brunet Y., Irvine M.R. The control of coherent eddies in vegetation canopies: Stream wise structure spacing, canopy shear scale and atmospheric stability [J]. Boundary-Layer Meteorology, 2000, 94: 139-163.

[2] Gao W., Shaw R.H., Paw U.K.T. Observation of organized structure in turbulent flow within and above a Forest canopy [J]. Boundary-Layer Meteorology, 1989, 47: 349-377.

[3] Shijie Han, Liaoliping, Fengqi Jiang Considerations on forest interface ecology [J]. China Journal Applied Ecology, 1998, 9(5): 538-542.

[4] Leclerc, M.Y. and Shaw, R.H. 1988. Space time correlations of U, W, T, P. Inside and above a deciduous forest canopy [C]. In: Proceedings of the Eight Symposium on turbulence and Diffusion. Amer. Meteorol. Soc., San Diego, 25–29 April.

[5] Leclerc M.Y., Beissner K.C., Shaw R.H. et al. The influence of atmospheric stability on the budgets of the Reynolds stress and turbulent kinetic energy within and above a deciduous forest [J]. Journal of Applied Meteorology, 1990, 29: 916-933.

[6] Leclerc M.Y., Leclerc K.C., Shaw R.H. et al. The influence of Buoyance on third-order turbulent velocity statistics within a deciduous forest [J]. Boundary-Layer Meteorology, 1991, 55: 109-123.

[7] Raupach M.R., Finnigan J.J., Brunet Y. Coherent Eddies and Turbulence in Vegetation Canopies: The Mixing-Layer Analogy [J]. Boundary-Layer Meteorology, 1996, 78: 351-382.

[8] Roland B. Stull An Introduction to boundary meteorology [M], 1988 Boston: Kluwer Academic Publishers

[9] Shaw R.H., Den Hartog G., Neumann H.H. Influence of foliar density and thermal stability on profiles of Reynolds stress and turbulence intensity in a deciduous forest [J]. Boundary-Layer Meteorology, 1988, 45: 391-409.

[10] Jianjun Shi, Wei Shu The effect of wall temperature on the coherent structure in wall turbulence [J]. Acta Mechanica Sinica, 1997, 29(1): 17-23.

[11] Wiscombe W.J., Evans J.W. Exponential-sum fitting of radiative transmission Functions [J]. Journal of Computational Physics, 1977, 24: 416-444.

[12] Xu Dahai. 1986. Multi-scaling and exponential fitting in autocorrelation analysis [C]. Fifth Joint Conference on Applications of Air Pollution Meteorology, 348–351, A.M.S.

[13] Dahai Xu The diffusion in multi-scalling atmospheric turbulence [J]. Acta Meteorologica sinica, 1989, 47(3): 302-311.

[14] Liren Xu, Zongkai Li, Hongsheng Zhang A study on multi-scale characteristics of the surface-layer turbulence on different underlying surface [J]. Acta Meteorologica sinica, 2000, 58(1): 83-94.

[15] Zhang Junhui. 2002. Structures of and Dominant Exchange Processes across Canopy-Atmosphere, Soil-Atmosphere ecological Interfaces of Mixed board leaved-Korean pine Forest in ChangBai Mountain [T]. Thesis submitted for PH Doctor.