{"id":62281,"date":"2022-03-23T08:06:44","date_gmt":"2022-03-23T13:06:44","guid":{"rendered":"https:\/\/olduvai.ca\/?p=62281"},"modified":"2022-03-23T08:06:44","modified_gmt":"2022-03-23T13:06:44","slug":"climate-impacts-from-a-removal-of-anthropogenic-aerosol-emissions","status":"publish","type":"post","link":"https:\/\/olduvai.ca\/?p=62281","title":{"rendered":"Climate Impacts From a Removal of Anthropogenic Aerosol Emissions"},"content":{"rendered":"
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Climate Impacts From a Removal of Anthropogenic Aerosol Emissions<\/a><\/h3>\n<\/div>\n<\/div>\n
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Abstract<\/strong><\/p>\n

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Limiting global warming to 1.5 or 2.0\u00b0C requires strong mitigation of anthropogenic greenhouse gas (GHG) emissions. Concurrently, emissions of anthropogenic aerosols will decline, due to coemission with GHG, and measures to improve air quality. However, the combined climate effect of GHG and aerosol emissions over the industrial era is poorly constrained. Here we show the climate impacts from removing present-day anthropogenic aerosol emissions and compare them to the impacts from moderate GHG-dominated global warming. Removing aerosols induces a global mean surface heating of 0.5\u20131.1\u00b0C, and precipitation increase of 2.0\u20134.6%. Extreme weather indices also increase. We find a higher sensitivity of extreme events to aerosol reductions, per degree of surface warming, in particular over the major aerosol emission regions. Under near-term warming, we find that regional climate change will depend strongly on the balance between aerosol and GHG forcing.<\/p>\n<\/div>\n<\/section>\n

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Plain Language Summary<\/strong><\/p>\n

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To keep within 1.5 or 2\u00b0 of global warming, we need massive reductions of greenhouse gas emissions. At the same time, aerosol emissions will be strongly reduced. We show how cleaning up aerosols, predominantly sulfate, may add an additional half a degree of global warming, with impacts that strengthen those from greenhouse gas warming. The northern hemisphere is found to be more sensitive to aerosol removal than greenhouse gas warming, because of where the aerosols are emitted today. This means that it does not only matter whether or not we reach international climate targets. It also matters how we get there.<\/p>\n

1 Introduction<\/strong><\/p>\n

If global warming is to be kept within 1.5 or 2.0\u00b0C, strong, and rapid mitigation of anthropogenic greenhouse gas (GHG) emissions is required (Matthews & Caldeira,\u00a02008<\/a>; Millar et al.,\u00a02017<\/a>; Rogelj, Luderer, et al.,\u00a02015<\/a>). As anthropogenic aerosols are often coemitted with long-lived GHG, such emissions will likely also see sharp decreases\u2014compounded by present and future effort to improve air quality (Bowerman et al.,\u00a02013<\/a>; Smith & Bond,\u00a02014<\/a>).<\/p>\n

\u2026click on the above link to read the rest of the article\u2026<\/p>\n<\/div>\n<\/section>\n<\/div>\n<\/article>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Climate Impacts From a Removal of Anthropogenic Aerosol Emissions Abstract Limiting global warming to 1.5 or 2.0\u00b0C requires strong mitigation of anthropogenic greenhouse gas (GHG) emissions. Concurrently, emissions of anthropogenic aerosols will decline, due to coemission with GHG, and measures to improve air quality. However, the combined climate effect of GHG and aerosol emissions over […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[4,7],"tags":[32784,32793,32787,32792,141,20757,369,32785,386,32790,32786,32789,32788,32791],"class_list":["post-62281","post","type-post","status-publish","format-standard","hentry","category-environment","category-survival-2","tag-advancing-earth-and-space-science","tag-anthropogenic-aerosol-emissions","tag-c-j-smith","tag-c-f-schleussner","tag-climate-change","tag-ghg","tag-global-warming","tag-greenhouse-gas-emissionsb-h-samset","tag-greenhouse-gases","tag-j-s-fuglestvedt","tag-m-sand","tag-p-m-forster","tag-s-e-bauer","tag-s-osprey"],"_links":{"self":[{"href":"https:\/\/olduvai.ca\/index.php?rest_route=\/wp\/v2\/posts\/62281","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/olduvai.ca\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/olduvai.ca\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/olduvai.ca\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/olduvai.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=62281"}],"version-history":[{"count":1,"href":"https:\/\/olduvai.ca\/index.php?rest_route=\/wp\/v2\/posts\/62281\/revisions"}],"predecessor-version":[{"id":62282,"href":"https:\/\/olduvai.ca\/index.php?rest_route=\/wp\/v2\/posts\/62281\/revisions\/62282"}],"wp:attachment":[{"href":"https:\/\/olduvai.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=62281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/olduvai.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=62281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/olduvai.ca\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=62281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}