Comparison of cloud products within IASI footprints for the assimilation of cloudy radiances
Comparison of cloud products within IASI footprints for the assimilation of cloudy radiances
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IASI 足迹内云产品的比较，用于同化多云辐射
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
F. Rabier
中科院分区：
文献类型：
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作者：
L. Lavanant;N. Fourrié;Antonia Gambacorta;G. Grieco;S. Heilliette;Fiona Hilton;Min‐Jeong Kim;A. Mcnally;H. Nishihata;E. Pavelin;F. Rabier
本文比较了欧洲 MetOp 卫星上的红外大气探测干涉仪 (IASI) 足迹中导出云特性的不同方法。对 10 个操作方案产生的云属性进行了评估，并对 12 小时全球采集的产品进行了比较。云覆盖了地球的很大一部分，污染了大部分辐射数据。云顶高度和探测器足迹内有效量的估计是直接同化受云影响的辐射的重要一步。这项研究首先检查了所有方案在所有复杂情况下检测和表征云的能力，并提供了一些数据可信度的指示。然后将数据集限制为厚阴单层，比较显示所有方案之间有显着的一致性。在光谱的长波部分中估计了检索到的云特性对计算的云辐射率和观测值之间的残差的影响。版权所有 © 2011 英国皇家气象学会、加拿大皇家和英国皇家版权所有，英国气象局
This article compares different methods of deriving cloud properties in the footprint of the Infrared Atmospheric Sounding Interferometer (IASI), onboard the European MetOp satellite. Cloud properties produced by ten operational schemes are assessed and an intercomparison of the products for a 12 h global acquisition is presented. Clouds cover a large part of the Earth, contaminating most of the radiance data. The estimation of cloud top height and effective amount within the sounder footprint is an important step towards the direct assimilation of cloud‐affected radiances. This study first examines the capability of all the schemes to detect and characterize the clouds for all complex situations and provides some indications of confidence in the data. Then the dataset is restricted to thick overcast single layers and the comparison shows a significant agreement between all the schemes. The impact of the retrieved cloud properties on the residuals between calculated cloudy radiances and observations is estimated in the long‐wave part of the spectrum. Copyright © 2011 Royal Meteorological Society, Crown in the right of Canada, and British Crown copyright, the Met Office