Hi All What a useful paper! I am a bit surprised that the instantaneous change is only 1 watt per square metre. The 20 bar grey scale at the bottom of the image below shows that we need at least three bars, 15% change, to detect the direction of a contrast gradient. Ship track images often show much more than this. Is it because somebody has tweaked the gamma range or that we do not see ship tracks that often? Maybe I misunderstand instantaneous.
[cid:[email protected]] Stephen From: [email protected] <[email protected]> On Behalf Of Geoengineering News Sent: 25 May 2023 13:37 To: [email protected] Subject: [geo] Detection of large-scale cloud microphysical changes and evidence for decreasing cloud brightness within a major shipping corridor after implementation of the International Maritime Organization 2020 fuel sulfur regulations (Preprint) This email was sent to you by someone outside the University. You should only click on links or attachments if you are certain that the email is genuine and the content is safe. https://egusphere.copernicus.org/preprints/2023/egusphere-2023-971/ Author Michael Steven Diamond Received: 11 May 2023 – Discussion started: 22 May 2023 Abstract. New regulations from the International Maritime Organization (IMO) limiting sulfur emissions from the shipping industry are expected to have large benefits in terms of public health but come with an undesired side effect: an acceleration of global warming as the climate-cooling effects of ship pollution on marine clouds is diminished. Previous work has found a substantial decrease in the detection of ship tracks in clouds after the IMO 2020 regulations went into effect but changes in large-scale cloud properties have been more equivocal. Using a statistical technique that estimates counterfactual fields of what large-scale cloud and radiative properties within an isolated shipping corridor in the southeastern Atlantic would have been in the absence of shipping, we confidently detect a reduction in the magnitude of cloud droplet effective radius decreases within the shipping corridor and find evidence for a reduction in the magnitude of cloud brightening as well. The instantaneous radiative forcing due to aerosol–cloud interactions from the IMO 2020 regulations is estimated as O(1 W m-2) within the shipping corridor, lending credence to global estimates of O(0.1 W m-2). In addition to their geophysical significance, our results also provide independent evidence for general compliance with the IMO 2020 regulations. How to cite. Diamond, M. S.: Detection of large-scale cloud microphysical changes and evidence for decreasing cloud brightness within a major shipping corridor after implementation of the International Maritime Organization 2020 fuel sulfur regulations, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-971, 2023. Source: EGU Sphere -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]<mailto:[email protected]>. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAHJsh9-zkOcRCXOqTnNmHeXk06asVwg-K7C7p%2BDDr%2B%3D6xEhuRw%40mail.gmail.com<https://groups.google.com/d/msgid/geoengineering/CAHJsh9-zkOcRCXOqTnNmHeXk06asVwg-K7C7p%2BDDr%2B%3D6xEhuRw%40mail.gmail.com?utm_medium=email&utm_source=footer>. The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. Is e buidheann carthannais a th’ ann an Oilthigh Dhùn Èideann, clàraichte an Alba, àireamh clàraidh SC005336. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/PAXPR05MB80482D613787E4B97CCE373CA7469%40PAXPR05MB8048.eurprd05.prod.outlook.com.
