On the Limits of CALIOP for Constraining Modeled Free Tropospheric Aerosol
On the Limits of CALIOP for Constraining Modeled Free Tropospheric Aerosol
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论CALIOP约束模拟自由对流层气溶胶的局限性
DOI：
10.1029/2018gl078195
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发表时间：
2018
影响因子：
5.2
通讯作者：
Watson-Parris D
中科院分区：
文献类型：
--
作者：
Watson-Parris D
具有正交偏振的星载云气溶胶激光雷达（CALIOP）仪器提供了有关全球气溶胶垂直分布的宝贵信息，并且通常用于评估大气环流模型（GCM）中的垂直气溶胶分布。然而，我们在这里表明，CALIOP 检索的检测限意味着未检测到背景气溶胶，从而导致统计数据显着偏斜，而且不同产品之间存在显着差异。在 CALIOP 2 级产品中，如果将其视为未检测到的气溶胶的代表，则这种缺失的低反向散射气溶胶会导致检索到的气溶胶分布显着过度代表对流层中层和上层的气溶胶反向散射和消光。 CALIOP 3 级产品假定没有检测到气溶胶，从而导致对对流层上层气溶胶消光剖面的低估。使用 ECHAM-HAM GCM，我们估计全球 CALIOP 白天（夜间）反演未检测到的气溶胶平均比例为 41% (44%)。
The spaceborne Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument provides valuable information on the vertical distribution of global aerosol and is often used to evaluate vertical aerosol distributions in general circulation models (GCMs). Here we show, however, that the detection limit of the CALIOP retrievals mean background aerosol is not detected, leading to substantially skewed statistics that moreover differ significantly by product. In the CALIOP Level 2 product this missing low‐backscatter aerosol results in the retrieved aerosol distribution significantly overrepresenting aerosol backscatter and extinction in the middle and upper troposphere if taken to be representative of the undetected aerosol. The CALIOP Level 3 product assumes no aerosol where none is detected, which then leads to an underestimation in the aerosol extinction profile in the upper troposphere. Using the ECHAM‐HAM GCM, we estimate that the mean fraction of aerosol undetected by CALIOP daytime (nighttime) retrievals is 41% (44%) globally.
影响因子：
5.1
作者：
D. Watson‐Parris;N. Schutgens;Nicholas Cook;Z. Kipling;P. Kershaw;E. Gryspeerdt;B. Lawrence;P. Stier
通讯作者：
D. Watson‐Parris;N. Schutgens;Nicholas Cook;Z. Kipling;P. Kershaw;E. Gryspeerdt;B. Lawrence;P. Stier