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ISSN 1006-9895

CN 11-1768/O4

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基于MODIS、CALIPSO资料的京津冀地区卷云云顶高度订正
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国家卫星气象中心

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国家自然科学基金


Correction for the cloud top height of cirrus with MODIS and CALIPSO dataset in Beijing-Tianjin-Hebei region
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National Satellite Meteorological Center

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    摘要:

    卷云在大气辐射中扮演着重要角色,对天气系统和气候变化产生重要影响。相比传统地基观测手段,卫星遥感更容易探测到高层卷云的信息,本文利用CALIOP主动遥感仪器可获取较为准确的薄卷云特性的特点,针对MODIS等被动遥感探测器反演的薄卷云顶高度的偏差开展订正研究。本研究选取2013-2017年京津冀地区MODIS云产品,结合CALIPSO的卷云云顶高度数据,基于交叉验证的方法得到线性拟合方案,对MODIS卷云云顶高度进行订正。订正后的MODIS与CALIPSO卷云云顶高度差值的分布区间由-3~2 km变为-2.0~2.5 km,峰值由-0.8 km左右变为0.2 km左右。订正效果随云顶高度和云光学厚度不同有所变化,其中较低层卷云和光学薄卷云订正效果更明显。

    Abstract:

    Cirrus plays an important role in atmospheric radiation. It affects weather system and climate change. Satellite remote sensing has great advantage in cirrus detection, relative to traditional observation. As a passive remote sensing instrument, large deviations are found at thin cirrus cloud top height from MODIS (Moderate Resolution Imaging Spectroradiometer). Comparatively, CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) aboard CALIPSO (Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observation) which is an active remote sensing instrument, can acquire more accurate characteristics of thin cirrus cloud. In this study, MODIS cloud products in Beijing-Tianjin-Hebei region from 2013 to 2017 are selected. Using CALIPSO cirrus cloud top height data, a linear fitting method is obtained based on cross-validation method, and MODIS cirrus cloud top height is corrected. The difference between MODIS and CALIPSO changes from -3~2 km to -2.0~2.5 km, and the maximum difference changes from about -0.8 km to about 0.2 km. In the context of different vertical levels and cloud optical depth, MODIS cirrus cloud top height is improved after correcting, which is more obvious at lower cloud top height and optical thinner cirrus.

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  • 收稿日期:2019-06-27
  • 最后修改日期:2019-10-17
  • 录用日期:2019-12-19
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