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- W4386896923 abstract "The marine shipping industry is among the strong emitters of nitrogen oxides (NOx) -- a substance harmful to ecology and human health. Monitoring of emissions from shipping is a significant societal task. Currently, the only technical possibility to observe NO2 emission from seagoing ships is using TROPOMI/S5P satellite data. A range of studies reported that NO2 plumes from some individual ships can be visually distinguished on selected TROPOMI images. However, all these studies applied subjectively established pre-determined thresholds to the minimal speed/length of the ship -- variables that to a large extent define the emission potential of a ship. In this study, we investigate the sensitivity of the TROPOMI sensor with respect to the NO2 emitted by individual seagoing ships of a certain speed/length. For this, we train a classification model to distinguish TROPOMI patches with a ship, from the patches, where there were no ships. In order to test for regional differences, we study four regions: the Mediterranean Sea, Biscay Bay, Arabian Sea, and Bengal Bay. For the Mediterranean and the Arabian Sea, we estimate the TROPOMI sensitivity limit to lie around a minimal speed of 10 kt and a minimal length of 150 m. We further show that when focusing the analysis on bigger emitters, the detectability of NO2 plumes can be improved up to 0.8 ROC-AUC. However, the rate of improvement is dependent on the region studied. Finally, we show that increasing the size of the dataset, beyond the dataset used in this study, will likely yield further improvements in the detectability of smaller/slower ships.This paper is the first comprehensive study on the real-world sensitivity of the TROPOMI instrument to distinguish the NO2 emission produced by seagoing ships." @default.
- W4386896923 created "2023-09-21" @default.
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- W4386896923 date "2023-09-22" @default.
- W4386896923 modified "2023-09-29" @default.
- W4386896923 title "TROPOMI/S5P sensitivity limits with respect to detection of NO2 plumes from seagoing ships" @default.
- W4386896923 doi "https://doi.org/10.31223/x50d5f" @default.
- W4386896923 hasPublicationYear "2023" @default.
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