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The cloud drop effective radius (alternatively cloud effective radius or simply effective radius when in context) is a weighted mean of the size distribution of cloud droplets. The term was defined in 1974 by James E. Hansen and Larry Travis as the ratio of the third to the second moment of a droplet size distribution to aid in the inversion of remotely sensed data. Physically, it is an area weighted radius of the cloud drop particles.Mathematically, this can be expressed as .

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  • Cloud drop effective radius (en)
  • 云滴有效半径 (zh)
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  • 云滴有效半径（或云有效半径、云粒子有效半径，或根据上下文简称有效半径）是云滴大小分布的加权平均值。 该术语于 1974 年由James E. Hansen和Larry Travis提出，定义为液滴尺寸分布的三阶矩与二阶矩之比，用于反演遥感数据。 从物理的角度来看，它是云滴粒子的面积加权半径。在数学上，计算公式为 . 水云和冰云的有效粒子半径值不同：前者约为 14 μm，而冰约为 25 μm。研究还表明，海洋上空的有效云滴半径比地面上大 15%-20%。相比之下，陆地和海洋的冰颗粒大小差异要小得多（只有 5%）。 (zh)
  • The cloud drop effective radius (alternatively cloud effective radius or simply effective radius when in context) is a weighted mean of the size distribution of cloud droplets. The term was defined in 1974 by James E. Hansen and Larry Travis as the ratio of the third to the second moment of a droplet size distribution to aid in the inversion of remotely sensed data. Physically, it is an area weighted radius of the cloud drop particles.Mathematically, this can be expressed as . (en)
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  • The cloud drop effective radius (alternatively cloud effective radius or simply effective radius when in context) is a weighted mean of the size distribution of cloud droplets. The term was defined in 1974 by James E. Hansen and Larry Travis as the ratio of the third to the second moment of a droplet size distribution to aid in the inversion of remotely sensed data. Physically, it is an area weighted radius of the cloud drop particles.Mathematically, this can be expressed as . The global effective particle radius has different values for water and ice clouds: the former is around 14 μm, whereas for ice it is around 25 μm. Studies also indicate that the effective cloud droplet radius is larger over oceans than over ground by 15%-20%. By contrast, the difference in the ice particle size over land and oceans is much smaller (only 5%). (en)
  • 云滴有效半径（或云有效半径、云粒子有效半径，或根据上下文简称有效半径）是云滴大小分布的加权平均值。 该术语于 1974 年由James E. Hansen和Larry Travis提出，定义为液滴尺寸分布的三阶矩与二阶矩之比，用于反演遥感数据。 从物理的角度来看，它是云滴粒子的面积加权半径。在数学上，计算公式为 . 水云和冰云的有效粒子半径值不同：前者约为 14 μm，而冰约为 25 μm。研究还表明，海洋上空的有效云滴半径比地面上大 15%-20%。相比之下，陆地和海洋的冰颗粒大小差异要小得多（只有 5%）。 (zh)
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