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Parameterization of clear-sky surface irradiance and its implications for estimation of aerosol direct radiative effect and aerosol optical depth

机译:晴空表面辐照度的参数化及其对气溶胶直接辐射效应和气溶胶光学深度的估计

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摘要

Aerosols impact clear-sky surface irradiance () through the effects of scattering and absorption. Linear or nonlinear relationships between aerosol optical depth (τa) and have been established to describe the aerosol direct radiative effect on (ADRE). However, considerable uncertainties remain associated with ADRE due to the incorrect estimation of (τa in the absence of aerosols). Based on data from the Aerosol Robotic Network, the effects of τa, water vapor content (w) and the cosine of the solar zenith angle (μ) on are thoroughly considered, leading to an effective parameterization of as a nonlinear function of these three quantities. The parameterization is proven able to estimate with a mean bias error of 0.32 W m−2, which is one order of magnitude smaller than that derived using earlier linear or nonlinear functions. Applications of this new parameterization to estimate τa from , or vice versa, show that the root-mean-square errors were 0.08 and 10.0 Wm−2, respectively. Therefore, this study establishes a straightforward method to derive from τa or estimate τa from measurements if water vapor measurements are available.
机译:气溶胶通过散射和吸收的作用影响晴空表面的辐照度()。已经建立了气溶胶光学深度(τa)之间的线性或非线性关系来描述气溶胶的直接辐射效应(ADRE)。然而,由于对(τa在没有气溶胶的情况下)的错误估计,ADRE仍存在相当多的不确定性。根据来自气溶胶机器人网络的数据,彻底考虑了τa,水蒸气含量(w)和太阳天顶角(μ)的余弦的影响,从而有效地将这三个量的参数化为非线性函数。事实证明,该参数设置能够以0.32 W m −2 的平均偏差进行估计,该偏差比使用早期线性或非线性函数得出的偏差小一个数量级。应用这种新的参数化方法估计τa,反之亦然,结果表明,均方根误差分别为0.08和10.0 Wm -2 。因此,这项研究建立了一种简单的方法,可以从τa导出或从测量中估计τa(如果有水蒸气测量可用)。

著录项

  • 期刊名称 Scientific Reports
  • 作者

    Xiangao Xia;

  • 作者单位
  • 年(卷),期 -1(5),-1
  • 年度 -1
  • 页码 14376
  • 总页数 11
  • 原文格式 PDF
  • 正文语种
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