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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Five years of shortwave radiation budget measurements at a continental land site in southeastern Australia
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Five years of shortwave radiation budget measurements at a continental land site in southeastern Australia

机译：在澳大利亚东南部的一个大陆陆地站点进行的五年短波辐射预算测量

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A new data set of near-continuous, high-quality measurements of the components of the land surface radiation budget (SRB) at a uniform site in Australia is described. Its intended uses include the validation of SRB parameters predicted by general circulation models (GCMs), the validation of SRB parameters remotely sensed by satellites, and the study of surface processes. The site at Uardry (145.30 degrees E, 34.39 degrees S) near the town of Hay is the first in Australia's Continental Integrated Ground-truth Site Network. It is located in extremely flat and homogeneous natural terrain, with grassland cover that is characteristic of much of the Australian continent, beneath an atmosphere that is characterized by low amounts of water vapor and aerosol. The measurements include the downwelling and upwelling shortwave flux densities. The upwelling measurements are made at several points across the site in order to sample the variability on a scale of 1 km, which is approximately the resolution of many current and planned satellite-based sensors. The paper describes the shortwave component of the data set, shows some internal quality checks, presents some statistical summaries, and makes comparisons with the albedos used in GCMs. It then discusses features of the temporal variation of the albedos derived from the data set in terms of their impact on the remote sensing of land albedo. In particular, significant morning-afternoon asymmetry is present in the diurnal variation on some days, and changes of 20% in albedo occur over a few days. Both of these characteristics violate common assumptions of algorithms used to retrieve land reflective properties from satellite measurements. Consideration of their effect is merited. [References: 22]
机译：描述了在澳大利亚统一地点的陆面辐射预算（SRB）分量的近连续，高质量测量的新数据集。它的预期用途包括验证由常规循环模型（GCM）预测的SRB参数，验证由卫星遥测的SRB参数以及研究表面过程。位于Hay镇附近的Uardry（东经145.30度，S.34.39度）的站点是澳大利亚大陆综合地面真相站点网络中的第一个站点。它位于极其平坦和均质的自然地形中，在以少量水蒸气和气溶胶为特征的大气层之下，拥有澳大利亚大部分地区的草原覆盖。测量包括下行和上行短波通量密度。为了在1 km的范围内对变化进行采样，在站点的多个点进行了上升流测量，这大约是许多当前和计划中的基于卫星的传感器的分辨率。本文描述了数据集的短波成分，显示了一些内部质量检查，给出了一些统计摘要，并与GCM中使用的反照率进行了比较。然后，就其对陆地反照率遥感的影响而言，讨论了从数据集得出的反照率随时间变化的特征。特别是，在某些天的昼夜变化中存在明显的早晨-下午不对称性，并且几天内反照率发生20％的变化。这两个特征都违反了用于从卫星测量中获取地面反射特性的算法的一般假设。考虑其效果是值得的。 [参考：22]

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