Estimating subpixel turbulent heat flux over leads from MODIS thermal infrared imagery with deep learning

The turbulent heat flux (THF) over leads is an important parameter for climate change monitoring in the Arctic region. THF over leads is often calculated from satellite-derived ice surface temperature (IST) products, in which mixed pixels containing both ice and open water along lead boundaries redu...

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Bibliographic Details
Published in:The Cryosphere
Main Authors: Yin, Zhixiang, Li, Xiaodong, Ge, Yong, Shang, Cheng, Li, Xinyan, Du, Yun, Ling, Feng
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2021
Subjects:
article
Verlagsveröffentlichung
Arctic
Climate change
The Cryosphere
Online Access:https://doi.org/10.5194/tc-15-2835-2021
https://noa.gwlb.de/receive/cop_mods_00057119
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056769/tc-15-2835-2021.pdf
https://tc.copernicus.org/articles/15/2835/2021/tc-15-2835-2021.pdf
Description
Summary:The turbulent heat flux (THF) over leads is an important parameter for climate change monitoring in the Arctic region. THF over leads is often calculated from satellite-derived ice surface temperature (IST) products, in which mixed pixels containing both ice and open water along lead boundaries reduce the accuracy of calculated THF. To address this problem, this paper proposes a deep residual convolutional neural network (CNN)-based framework to estimate THF over leads at the subpixel scale (DeepSTHF) based on remotely sensed images. The proposed DeepSTHF provides an IST image and the corresponding lead map with a finer spatial resolution than the input IST image so that the subpixel-scale THF can be estimated from them. The proposed approach is verified using simulated and real Moderate Resolution Imaging Spectroradiometer images and compared with the conventional cubic interpolation and pixel-based methods. The results demonstrate that the proposed CNN-based method can effectively estimate subpixel-scale information from the coarse data and performs well in producing fine-spatial-resolution IST images and lead maps, thereby providing more accurate and reliable THF over leads.

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