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A sensitivity analysis of a surface energy balance model to LAI (Leaf Area Index)

机译：表面能平衡模型对LAI（叶面积指数）的敏感性分析

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摘要

The LAI is a key parameter in hydrological processes, especially in the physically based distribution models. It is a critical ecosystem attribute since physiological processes such as photosynthesis, transpiration and evaporation depend on it. The diffusion of water vapor, momentum, heat and light through the canopy is regulated by the distribution and density of the leaves, branches, twigs and stems. The LAI influences the sensible heat flux H in the surface energy balance single source models through the calculation of the roughness length and of the displacement height. The aerodynamic resistance between the soil and within-canopy source height is a function of the LAI through the roughness length. This research carried out a sensitivity analysis of some of the most important parameters of surface energy balance models to the LAI time variation, in order to take into account the effects of the LAI variation with the phenological period. Finally empirical retrieved relationships between field spectroradiometric data and the field LAI measured via a light-sensitive instrument are presented for a cereal field.
机译：LAI是水文过程中的关键参数，尤其是在基于物理的分配模型中。它是生态系统的关键属性，因为诸如光合作用，蒸腾作用和蒸发等生理过程都依赖于它。水蒸气，动量，热量和光在树冠中的扩散受叶子，树枝，嫩枝和茎的分布和密度的调节。 LAI通过计算粗糙度长度和位移高度来影响表面能平衡单源模型中的显热通量H。土壤和冠层内部高度之间的空气动力学阻力是LAI在粗糙度长度范围内的函数。这项研究对表面能平衡模型的一些最重要参数对LAI时间变化进行了敏感性分析，以考虑到LAI变化对物候期的影响。最后，给出了针对谷物田的现场光谱辐射数据与通过光敏仪器测量的田间LAI之间的经验检索关系。

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  • 来源
  • 会议地点 Wales(GB);Wales(GB)
  • 作者

    A. Maltese; M. Cannarozzo; F. Capodici; G. La Loggia; T. Santangelo;

  • 作者单位

    Universita di Palermo, Dipartimento di Ingegneria Idraulica ed Applicazioni Ambientali, Viale delle Scienze, 90128 Palermo, Italy;

    Universita di Palermo, Dipartimento di Ingegneria Idraulica ed Applicazioni Ambientali, Viale delle Scienze, 90128 Palermo, Italy;

    Universita di Palermo, Dipartimento di Ingegneria Idraulica ed Applicazioni Ambientali, Viale delle Scienze, 90128 Palermo, Italy;

    Universita di Palermo, Dipartimento di Ingegneria Idraulica ed Applicazioni Ambientali, Viale delle Scienze, 90128 Palermo, Italy;

    Universita di Palermo, Dipartimento di Colture Arboree, Viale delle Scienze, 90128 Palermo, Italy;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境遥感;
  • 关键词

    leaf area index; energy balance; sensitivity analysis; hydrological processes;

    机译：叶面积指数；能量平衡；敏感性分析;水文过程;

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