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Dear colleagues,
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<div style="margin:0px" class="ContentPasted0">As you may notice, the EOAS colloquium
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originally scheduled<span class="ContentPasted1"> for the last Friday </span></span>will be held this coming Friday. The speaker is Dr. Michael Diamond of EOAS.</div>
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<div style="margin:0px" class="ContentPasted0"><b class="ContentPasted0">Time</b>: Friday, Oct 27 @ 3:00 PM</div>
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<div style="margin:0px" class="ContentPasted0"><b class="ContentPasted0">Location</b>: EOAS 1050 (regular EOAS colloquium room)</div>
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<div style="margin:0px" class="ContentPasted0">Title: <span style="margin: 0px; background-color: white;" class="ContentPasted0">Detection of large-scale cloud microphysical changes within a major shipping corridor after implementation of the International
Maritime Organization 2020 fuel sulfur regulations</span></div>
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<b class="ContentPasted0">Abstract</b>: 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 may come with an undesired side
effect: acceleration of global warming as the climate-cooling effects of ship pollution on marine clouds are 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 to be of order 1 W m−2 within the shipping corridor, lending credence to global estimates of order 0.1 W m−2 from climate models. Although the contribution to warming
since 2020 is expected to be small globally, the effects may be much larger regionally in the north Atlantic and Pacific. In addition to their geophysical significance, our results also provide independent evidence for general compliance with the IMO 2020
regulations.
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<div style="margin:0px" class="ContentPasted0"><b class="ContentPasted0">Note</b>: Colleagues are encouraged to attend the colloquium in person. However, attending online will be feasible. Please request the colloquium Zoom link from Zhaohua Wu (zwu@fsu.edu)
if you plan to attend online.</div>
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<div style="margin:0px" class="ContentPasted0">Cheers,</div>
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<span style="margin:0px" class="ContentPasted0">Zhaohua</span></div>
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