Modeling spatial distribution of pan evaporation based on quinat-variate thin plate spline function
Modeling spatial distribution of pan evaporation based on quinat-variate thin plate spline function
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发表时间：
2006
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通讯作者：
C. Land
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作者：
C. Land
蒸发皿蒸发量（E_(pan)）受辐射、水汽压和风等多因素影响的空间分布是地理模式和气候模式的重要参数，也是环境管理的关键。然而，气象观测站在地面上的分布通常是稀疏而不规则的。需要插值可用的点数据来估计任意位置的值的技术。本文介绍了对1980 ~ 2000年黄土高原粗砂丘陵集水区53个站点的逐月Epan数据进行插值，得到252个Epan面。以蒸汽压差（p_d）、净辐射（R_n）和风速（wind）为三个协变量子模型，建立了四变量部分薄板样条模型。GCV统计表明，所得蒸发表面具有较高的保真度和平滑度。消差率（各协变量的蒸发变化率）表明：Epan对Rn的依赖性虽然在春分时略大，但没有强烈的季节趋势；E_（pan）对p_d的依赖性趋势明显，夏季影响最强，冬季风速的相对影响更大。
Spatial distribution of pan evaporation(E_(pan)) depending on multiple factors such as radiation,(vapor) pressure and wind is a crucial parameter for geographic models and climatic models,and also a key to(environmental) management.However the weather observation stations normally distribute sparsely and irregularly on the ground.The techniques to interpolate available point data to estimate the value of any location is demanded.This paper introduces the process to interpolate monthly Epan data of 53 stations for the period of 1980 to 2000 to create 252 Epan surfaces in Coarse Sandy Hilly Catchments of Loess Plateau.Quinat-variate partial thin plate spline models were developed in which vapor pressure deficit(p_d),net radiation(R_n) and wind speed(wind) were used as three covariate sub-models.GCV statistics indicate that the resultant evaporation surfaces hold high fidelity and smoothness.The lapse rates(evaporation changing rate with each covariate) showed that: the dependence of Epan on Rn has no strong seasonal trend although at the equinoxes it is slightly big,whereas the dependence of E_(pan) on p_d has an obvious trend with strongest influence in summer,and wind speed has more relative influence in winter.