Comparison of the cloud top heights retrieved from MODIS and AHI satellite data with ground-based Ka-band radar
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Published:2020-01-02
Issue:1
Volume:13
Page:1-11
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Huo JuanORCID, Lu Daren, Duan Shu, Bi Yongheng, Liu Bo
Abstract
Abstract. To better understand the accuracy of cloud top heights
(CTHs) derived from passive satellite data, ground-based Ka-band radar
measurements from 2016 and 2017 in Beijing are compared with CTH data
inferred from the Moderate Resolution Imaging Spectroradiometer (MODIS) and
the Advanced Himawari Imager (AHI). Relative to the radar CTHs, the MODIS
CTHs are found to be underestimated by−1.10 ± 2.53 km on average and 49 % of CTH differences are within 1.0 km. The AHI CTHs are
underestimated by −1.10 ± 2.27 km and 42 % are within 1.0 km. Both
the MODIS and AHI CTH retrieval accuracy depends strongly on the cloud depth
(CD). Large differences are mainly due to the retrieval of thin clouds of CD
<1 km, especially when the cloud base height is higher than 4 km.
For clouds with CD >1 km, the mean CTH difference decreases to
-0.48±1.70 km for MODIS and to -0.76±1.63 km for AHI. It
is found that MODIS CTHs with higher values (i.e. >6 km) show
smaller discrepancy with radar CTH than those MODIS CTHs with lower values
(i.e. <4 km). Statistical analysis illustrate that the CTH
difference between the two satellite instruments is lower than the
difference between the satellite instrument and the ground-based Ka-band
radar. The monthly accuracy of both CTH retrieval algorithms is investigated
and it is found that summer has the smallest retrieval difference.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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