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http://dx.doi.org/10.7780/kjrs.2018.34.6.2.10

The Estimation of Arctic Air Temperature in Summer Based on Machine Learning Approaches Using IABP Buoy and AMSR2 Satellite Data  

Han, Daehyeon (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology)
Kim, Young Jun (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology)
Im, Jungho (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology)
Lee, Sanggyun (Centre for Polar Observation and Modelling, University College London)
Lee, Yeonsu (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology)
Kim, Hyun-cheol (Unit of Arctic Sea-Ice Prediction, Korea Polar Research Institute)
Publication Information
Korean Journal of Remote Sensing / v.34, no.6_2, 2018 , pp. 1261-1272 More about this Journal
Abstract
It is important to measure the Arctic surface air temperature because it plays a key-role in the exchange of energy between the ocean, sea ice, and the atmosphere. Although in-situ observations provide accurate measurements of air temperature, they are spatially limited to show the distribution of Arctic surface air temperature. In this study, we proposed machine learning-based models to estimate the Arctic surface air temperature in summer based on buoy data and Advanced Microwave Scanning Radiometer 2 (AMSR2)satellite data. Two machine learning approaches-random forest (RF) and support vector machine (SVM)-were used to estimate the air temperature twice a day according to AMSR2 observation time. Both RF and SVM showed $R^2$ of 0.84-0.88 and RMSE of $1.31-1.53^{\circ}C$. The results were compared to the surface air temperature and spatial distribution of the ERA-Interim reanalysis data from the European Center for Medium-Range Weather Forecasts (ECMWF). They tended to underestimate the Barents Sea, the Kara Sea, and the Baffin Bay region where no IABP buoy observations exist. This study showed both possibility and limitations of the empirical estimation of Arctic surface temperature using AMSR2 data.
Keywords
Arctic surface air temperature; Buoy; AMSR2; the International Arctic Bouy Programme; Random Forest; Support Vector Machine;
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