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ncycgdxhl
Wysłany: Pią 10:16, 14 Sty 2011
Temat postu: Vegetation and the atmosphere material and energy
Vegetation and the atmosphere material and energy exchange between the inversion theory Progress
A3 (z) (c) = A4 (z) (14) which, ...: (Mak ) plus 【wheat] _c4 ÷: A () of a C Engineering s c) z2 (15) the equation of the scalar statistics related to the speed and the relaxation time scale (r) by the Wilson et al [361 second-order closure model; coefficient of A1 (z), A2 (z), A3 (z) and A (z) is only concerned with the speed of statistical profiles; mean scalar concentration profiles can be directly measured for A (z) calculation. Katul, etc. 【1】 The EUL contains a non-Gaussian statistical model (that is, non-zero www) and the scalar convection transport term, these two mechanisms is the LNF theory ignored. But compared with the LNF theory, EUL model in the calculation of source strength S and the flux,
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, the average scalar concentration has a strong sensitivity to [14I3l1.5 Euler. Lagrange coupling method in recent years, Siqueira [3 ~ 1 proposed a joint LNF and the EUL of the coupled model (HEL). This approach has absorbed the merits of the first two models, using second-order closure model of Euler matrix D,
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, the calculation of source strength S stable algorithm is applied in equation (9a, 9b). Second order ordinary differential equations described by closed source strength and concentration profiles can be expressed as v fog + B2 v B1: B3 (z) (16) where, Bt (z) Jimmy 8ll ---- lB2 (z) I + (Michael) I added,
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, as [do +2, yu] l + C4I In fact, the calculation of matrix D can be divided into the following steps: 1) set up a unit at the source node; 2) are integral to this source profile W \layers), which is measured scalar concentration data obtained. In node: 1,2 .... Repeat the above procedure M can be obtained equation (9a.b) Matrix D required for this method not only reflects the LNF theory of stability,
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, but also through the coefficients B1 and B2 into account the impact of X ~ D, so that more physical significance Dd . 6 Conclusion In summary, the above theories and methods for studying the atmosphere and vegetation between the material and energy transfer process is extremely important in the technical sense,
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, to understand the micro-climate vegetation environment provides a new scientific tools, and have a more complete theoretical framework. In China, Wang Zhi, etc. [34J this theory has been applied to the rates from forest of Changbai Mountain, and achieved good results. But there are still limitations of this study: 1) model to the basic assumptions of the neutral atmosphere, became, under the conditions of non-neutral model for the stability and applicability of the large uncertainties still exist; 2) the current on the vegetation atmospheric boundary layer with material and energy transmission research focused on short-term simulation 【1, for long time series data set has not been reported. Global flux network covers a wide range of surface types and vegetation types. How in the model parameterization of complex surface, the introduction of the physiological mechanisms of vegetation and vegetation structure, and improving the simulation model is applied to the entire forest is the main direction of future research.
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