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The influence of simulated surface dust lofting and atmospheric loading on radiative forcing

机译：模拟表面粉尘Lofting和大气载荷对辐射强制的影响

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摘要

This high-resolution numerical modeling study investigates the potential range of impact of surface-lofted dust aerosols on the mean radiative fluxes and temperature changes associated with a dust-lofting episode over the Arabian Peninsula (2-5 August 2016). Assessing the potential for lofted dust to impact the radiation budget and temperature response in regions of the world that are prone to intense dust storms is important due to the impact of such temperature perturbations on thermally driven mesoscale circulations such as sea breezes and convective outflows. As such, sensitivity simulations using various specifications of the dusterodible fraction were performed using two high-resolution mesoscale models that use similar dust-lofting physics based on threshold friction wind velocity and soil characteristics. The dust-erodible fraction, which represents the fraction (0.0 to 1.0) of surface soil that could be mechanically lifted by the wind and controls the location and magnitude of surface dust flux, was varied for three experiments with each model. The "Idealized" experiments, which used an erodible fraction of 1.0 over all land grid cells, represent the upper limit on dust lofting within each modeling framework, the "Ginoux" experiments used a 1o resolution, spatially varying erodible fraction dataset based on topographic depressions, and the "Walker" experiments used satellite-identified, 1 km resolution data with known lofting locations given an erodible fraction of 1.0. These simulations were compared with a "No-Dust" experiment in which no dust aerosols were permitted. The use of erodible fraction databases in the Ginoux and Walker simulations produced similar dust loading which was more realistic than that produced in the Idealized lofting simulations. Idealized lofting in this case study generated unrealistically large amounts of dust compared with observations of aerosol optical depth (AOD) due to the lack of locational constraints. Generally, the simul
机译：该高分辨率数值建模研究调查了表面升高的粉尘气溶胶对平均辐射助熔剂和温度变化的潜在范围，与阿拉伯半岛（2016年8月2日）的灰尘宽松集团相关。由于这种温度扰动的影响，对倾向于激烈的暴风雨的辐射预算和温度响应来评估倾斜粉尘的潜力，这是由于这种温度扰动的影响，这些温度暴风雨在海风和对流外流等热驱动的Mescreation循环中，这是重要的。因此，使用基于阈值摩擦风速和土壤特性使用类似的粉尘源性物理学进行使用的两种高分辨率Mescle模型来进行使用各种规格的无帽可拆卸分数的敏感性模拟。灰尘折叠馏分，其代表可以通过风力地抬起的表面土壤（0.0至1.0），并控制表面灰尘通量的位置和大小，为每个模型进行三次实验。在所有土地网格细胞上使用1.0的“理想化”实验，它代表了每个建模框架内的灰尘偏差的上限，“Ginoux”实验使用了基于地形凹陷的10分辨率，空间变化的易蚀馏分数据集，“Walker”实验使用了卫星识别的1公里分辨率的数据，具有已知的宽松位置，给出1.0的可蚀的分数。将这些模拟与“无尘”实验进行了比较，其中允许粉尘气溶胶。在Ginoux和Walker模拟中使用可侵蚀的分数数据库产生了类似的粉尘负荷，这比在理想化的Lofting模拟中产生的更真实。在这种情况下，理想化的Lofting在这种情况下，与由于缺乏定位约束而导致的气溶胶光学深度（AOD）的观察相比，产生了不切实际的大量灰尘。一般来说，simul

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  • 来源
    《Atmospheric chemistry and physics》 |2019年第2期|共23页
  • 作者

    Stephen M. Saleeby; Susan C. van den Heever; Jennie Bukowski; Annette L. Walker; Jeremy E. Solbrig; Samuel A. Atwood; Qijing Bian; Sonia M. Kreidenweis; Yi Wang; Jun Wang; Steven D. Miller;

  • 作者单位

    Department of Atmospheric Science Colorado State University Fort Collins Colorado USA;

    Department of Atmospheric Science Colorado State University Fort Collins Colorado USA;

    Department of Atmospheric Science Colorado State University Fort Collins Colorado USA;

    Naval Research Laboratory Monterey California USA;

    Cooperative Institute for Research in the Atmosphere Fort Collins Colorado USA;

    Department of Atmospheric Science Colorado State University Fort Collins Colorado USA;

    Department of Atmospheric Science Colorado State University Fort Collins Colorado USA;

    Department of Atmospheric Science Colorado State University Fort Collins Colorado USA;

    Department of Chemical and Biochemical Engineering Interdisciplinary Graduate Program in Informatics Center for Global and Regional Environmental Research University of Iowa Iowa City Iowa USA;

    Department of Chemical and Biochemical Engineering Interdisciplinary Graduate Program in Informatics Center for Global and Regional Environmental Research University of Iowa Iowa City Iowa USA;

    Cooperative Institute for Research in the Atmosphere Fort Collins Colorado USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
  • 关键词

    influence of simulated; surface dust lofting and atmospheric; loading on radiative forcing;

    机译：模拟的影响;表面防尘和大气的影响;辐射强制加载;

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