Volume 40 Issue 10
Oct.  2021
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Fangjie Yu, Zeyuan Wang, Shuai Liu, Ge Chen. Inversion of the three-dimensional temperature structure of mesoscale eddies in the Northwest Pacific based on deep learning[J]. Acta Oceanologica Sinica, 2021, 40(10): 176-186. doi: 10.1007/s13131-021-1841-z
Citation: Fangjie Yu, Zeyuan Wang, Shuai Liu, Ge Chen. Inversion of the three-dimensional temperature structure of mesoscale eddies in the Northwest Pacific based on deep learning[J]. Acta Oceanologica Sinica, 2021, 40(10): 176-186. doi: 10.1007/s13131-021-1841-z

Inversion of the three-dimensional temperature structure of mesoscale eddies in the Northwest Pacific based on deep learning

doi: 10.1007/s13131-021-1841-z
Funds:  The National Key Research and Development Program of China under contract Nos 2016YFC1402608, 2016YFC1400904, 2016YFC1400900 and 2019YFD0901000.
More Information
  • Corresponding author: E-mail: gechen@ouc.edu.cn
  • Received Date: 2020-08-31
  • Accepted Date: 2021-04-02
  • Available Online: 2021-09-10
  • Publish Date: 2021-10-30
  • Mesoscale eddies, which are mainly caused by baroclinic effects in the ocean, are common oceanic phenomena in the Northwest Pacific Ocean and play very important roles in ocean circulation, ocean dynamics and material energy transport. The temperature structure of mesoscale eddies will lead to variations in oceanic baroclinity, which can be reflected in the sea level anomaly (SLA). Deep learning can automatically extract different features of data at multiple levels without human intervention, and find the hidden relations of data. Therefore, combining satellite SLA data with deep learning is a good way to invert the temperature structure inside eddies. This paper proposes a deep learning algorithm, eddy convolution neural network (ECN), which can train the relationship between mesoscale eddy temperature anomalies and sea level anomalies (SLAs), relying on the powerful feature extraction and learning abilities of convolutional neural networks. After obtaining the temperature structure model through ECN, according to climatic temperature data, the temperature structure of mesoscale eddies in the Northwest Pacific is retrieved with a spatial resolution of 0.25° at depths of 0–1 000 m. The overall accuracy of the ECN temperature structure is verified using Argo profiles at the locations of cyclonic and anticyclonic eddies during 2015–2016. Taking 10% error as the acceptable threshold of accuracy, 89.64% and 87.25% of the cyclonic and anticyclonic eddy temperature structures obtained by ECN met the threshold, respectively.
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