Cite as:
Cheng, X.; Yi, L. &amp; Bendix, J. (2021): <b>Cloud top height retrieval over Arctic Ocean using cloud-shadow method based on MODIS</b>. <i>Atmospheric Research</i> <b>253</b>, 105468.

Resource Description

Title: Cloud top height retrieval over Arctic Ocean using cloud-shadow method based on MODIS
FOR816dw ID: 408
Publication Date: 2021-01-01
License and Usage Rights:
Resource Owner(s):
Individual: Xueying Cheng
Individual: Li Yi
Individual: Jörg Bendix
Cloud top height (CTH) plays an important role in the Earth’s radiation budget and thus in climate change. <br/> However, accurate CTH retrieval based on satellite data remains a challenge when using currently widespread <br/> methods based on passive remote sensing satellite data, particularly over the Arctic Ocean. It is well known that <br/> using geometric correlation between CTH and cloud-shadow distance along the normal direction of sunlight, <br/> cloud-edge top height (CETH) can be determined. However, this cloud-shadow method (CSM) exhibited larger <br/> CTH errors due to low-resolution weather satellite data of the past. The aim of the paper is to analyze the effect of <br/> higher-resolution images (MODIS with 250-m resolution) on CSM accuracy. We present a method in which CETH <br/> is first retrieved using the MODIS data, and to calculate CTH in the center of cloud region by combining the <br/> calculated CETH and cloud top brightness temperature using an environmental temperature lapse rate method. <br/> We validated 14 cases over the Arctic Ocean by the CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder <br/> Satellite Observations) CTH lidar product and another two cases by radiosonde data. CSM revealed better per-<br/> formance (mean difference is 0.45 km and standard deviation is 0.92 km) compared to the operational MODIS <br/> CTH product (mean difference is 0.78 km and standard deviation is 1.78 km), when validated by the CALIPSO <br/> product. When validated by sounding data, CSM also performed better than the MODIS CTH product: the CSM <br/> CTH errors are 0.41 and 0.52 km in two sounding cases, while the corresponding MODIS CTH errors are 1.10 <br/> and 1.07 km. The CSM technique especially showed better performance for double-deck cloud systems. We <br/> conclude that further improvements in CTH accuracy based on CSM can be achieved by mainly using higher- <br/> resolution satellite imagery.
| MODIS | Fog | Arctic | top height | Calipso |
Literature type specific fields:
Journal: Atmospheric Research
Volume: 253
Page Range: 105468
Publisher: Elsevier
Metadata Provider:
Individual: Jörg Bendix
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