Hauptseite > Publikationsdatenbank > Graph Machine Learning for Improved Imputation of Missing Tropospheric Ozone Data > print

001     1014687
005     20240116084318.0
024 7 _ |a 10.1021/acs.est.3c05104
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024 7 _ |a 1520-5851
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024 7 _ |a 10.34734/FZJ-2023-03392
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041 _ _ |a English
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100 1 _ |a Betancourt, Clara
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245 _ _ |a Graph Machine Learning for Improved Imputation of Missing Tropospheric Ozone Data
260 _ _ |a Columbus, Ohio
|c 2023
|b American Chemical Society
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520 _ _ |a Gaps in the measurement series of atmospheric pollutants can impede the reliable assessment of their impacts and trends. We propose a new method for missing data imputation of the air pollutant tropospheric ozone by using the graph machine learning algorithm “correct and smooth”. This algorithm uses auxiliary data that characterize the measurement location and, in addition, ozone observations at neighboring sites to improve the imputations of simple statistical and machine learning models. We apply our method to data from 278 stations of the year 2011 of the German Environment Agency (Umweltbundesamt – UBA) monitoring network. The preliminary version of these data exhibits three gap patterns: shorter gaps in the range of hours, longer gaps of up to several months in length, and gaps occurring at multiple stations at once. For short gaps of up to 5 h, linear interpolation is most accurate. Longer gaps at single stations are most effectively imputed by a random forest in connection with the correct and smooth. For longer gaps at multiple stations, the correct and smooth algorithm improved the random forest despite a lack of data in the neighborhood of the missing values. We therefore suggest a hybrid of linear interpolation and graph machine learning for the imputation of tropospheric ozone time series.
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536 _ _ |a IntelliAQ - Artificial Intelligence for Air Quality (787576)
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700 1 _ |a Li, Cathy W. Y.
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700 1 _ |a Kleinert, Felix
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700 1 _ |a Schultz, Martin G.
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770 _ _ |a Data Science for Advancing Environmental Science, Engineering and Technology
773 _ _ |a 10.1021/acs.est.3c05104
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|y 2023
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