@article{Watson-Parris:2022:10.1073/pnas.2206885119,
author = {Watson-Parris, D and Christensen, MW and Laurenson, A and Clewley, D and Gryspeerdt, E and Stier, P},
doi = {10.1073/pnas.2206885119},
journal = {Proceedings of the National Academy of Sciences of USA},
pages = {1--5},
title = {Shipping regulations lead to large reduction in cloud perturbations.},
url = {http://dx.doi.org/10.1073/pnas.2206885119},
volume = {119},
year = {2022}
}
TY - JOUR
AB - Global shipping accounts for 13% of global emissions of SO2, which, once oxidized to sulfate aerosol, acts to cool the planet both directly by scattering sunlight and indirectly by increasing the albedo of clouds. This cooling due to sulfate aerosol offsets some of the warming effect of greenhouse gasses and is the largest uncertainty in determining the change in the Earth's radiative balance by human activity. Ship tracks-the visible manifestation of the indirect of effect of ship emissions on clouds as quasi-linear features-have long provided an opportunity to quantify these effects. However, they have been arduous to catalog and typically studied only in particular regions for short periods of time. Using a machine-learning algorithm to automate their detection we catalog more than 1 million ship tracks to provide a global climatology. We use this to investigate the effect of stringent fuel regulations introduced by the International Maritime Organization in 2020 on their global prevalence since then, while accounting for the disruption in global commerce caused by COVID-19. We find a marked, but clearly nonlinear, decline in ship tracks globally: An 80% reduction in SO[Formula: see text] emissions causes only a 25% reduction in the number of tracks detected.
AU - Watson-Parris,D
AU - Christensen,MW
AU - Laurenson,A
AU - Clewley,D
AU - Gryspeerdt,E
AU - Stier,P
DO - 10.1073/pnas.2206885119
EP - 5
PY - 2022///
SN - 0027-8424
SP - 1
TI - Shipping regulations lead to large reduction in cloud perturbations.
T2 - Proceedings of the National Academy of Sciences of USA
UR - http://dx.doi.org/10.1073/pnas.2206885119
UR - https://www.ncbi.nlm.nih.gov/pubmed/36191195
UR - https://www.pnas.org/doi/full/10.1073/pnas.2206885119
UR - http://hdl.handle.net/10044/1/100001
VL - 119
ER -