Priority application deadline is April 20! 🧪
#ChemSky

Atmospheric Chemistry Insights from the Global COVID-19 Pandemic: A Review The COVID-19 pandemic and resulting reductions in worldwide emissions, associated primarily with the transport sector, provided an unprecedented opportunity to explore the response of atmospheric chemistry and composition to large anthropogenic emissions perturbations. While air quality generally improved in early 2020, this was tempered by increased formation of secondary pollutants (e.g., O3 and secondary particulate matter, PM) in many regions studied. Declines in NOx emissions were largely responsible for the changes in O3, driving decreases in O3 concentrations in remote regions and increases in urban regions due to both decreases in O3 titration by NOx and also nonlinear changes in O3 production. Lower NOx levels also increased the levels of other oxidants (e.g., OH and O3), leading to a general increase in atmospheric oxidation in polluted urban regions. This enhanced oxidation promoted additional PM formation in some regions but was generally outweighed by decreases in primary PM and other secondary precursors (SO2 and VOCs). The COVID-19 pandemic gave rise to large local perturbations in air quality but only modest reductions in the global abundance of short-lived climate forcers (including O3 and PM).

Delighted to share that our review on what the COVID-19 lockdowns revealed about atmospheric chemistry was published today. What fun to write papers with wonderful colleague/friends! @jessekroll.bsky.social @envchemjen.bsky.social @chemdelphine.bsky.social

pubs.acs.org/doi/10.1021/...

Mendeleev's nightmare

PostdocAd-GXS Postdoctoral Associate: Geostationary measurements of atmospheric chemistry Join us! Our atmospheric chemistry group at the University of Minnesota (UMN) is seeking applications for a Postdoctoral A...

Postdoc opening: Geostationary measurements of atmospheric chemistry

Join us! Our group seeks a postdoc to work on space-based measurements of atmospheric chemistry with the new generation of geo-IR satellite instruments.

See z.umn.edu/b5iz for details & contact me (dbm@umn.edu) with questions!

Hej CATCH community!👋 Don't miss our next seminar by Jennifer Murphy @envchemjen.bsky.social (Uni Toronto) on March 18th, 15:00 UTC on "Sources and fate of atmospheric ammonia in the Arctic". Zoom link & calendar entry as usual on 👉 www.catchscience.org #CATCHscience @igac-ecr.bsky.social

Especially this song because it's all about trying to capture Yankee gold 😪

Between the hockey and the snow shovelling, there are probably going to be a few extra cardiac events in North America this weekend.

Karmically, Canada should be allowed an extra man on the ice for the duration of our penalty

Me: Winter is almost over, maybe I can put my SAD lamp away.
Toronto weather for the next 3 days: Good luck

Tuesday!

a man wearing a white tank top and blue pants is standing in a dark room ALT: a man wearing a white tank top and blue pants is standing in a dark room

The Make Steel Hard Again Act, which requires that all international shipments of stainless steel parts are delivered by drone, released from a height of 1 km overhead. Or, The Red, White and Blue Steel Act, which requires you to watch Zoolander and (God help you) Zoolander 2 before placing an order

U.S. Supreme Court finds Trump overstepped authority in imposing tariffs under emergency law | CBC

www.cbc.ca/news/world/l...
Does this mean I can start ordering stainless steel compression fittings again?

🚨 We’re hiring a Canada Impact+ Research Chair in Remote Sensing in the University of Lethbridge’s Department of Geography & Environment. 🚨

🔗 Full details and application link: uleth.peopleadmin.ca/postings/8952

📆 Application review starts March 9!

This is the first winter in 3 years that I didn't plan a snowpack chemistry field experiment, and then only get like two days of data, so it's totally my fault that Toronto is getting so much snow this year 😳 #snowTO #ONStorm

Toronto is at the special triple point, aka that rare "wintry mix" trifecta where the three phases of H2O are rain, ice, and snow. (My skin agrees there is no water vapour present in the air)

Everyone at #AGU25, make your fonts bigger.

Raccoon is the new 'Florida man'

But seriously, autoöxidation is better than autoxidation

Time to see if 2025 'Ove' Glove measures up to the ~2010 model

If you work on sources and impacts of VOCs (biogenic or anthropogenic) from measurement to modeling perspectives please submit an abstract to our atmospheric organics session at #EGU26! Our invited speakers are @dbm.bsky.social and @jacquirickard.bsky.social See you in Vienna! tinyurl.com/55vda8u7

Opinion: Ottawa is scrapping Canada’s greenwashing rules. This is a mistake Canada should not back away from holding firms to account for what they say about the environment

The Canadian government is ignoring research and the voices of green business and is cutting our brand new greenwashing law. Read more in our Globe and Mail op ed today.

Opinion: How much are MPs entitled to know about research grants? Not as much as they think A parliamentary committee is asking for academics’ private information on a strange anti-DEI crusade

www.theglobeandmail.com/opinion/arti...

On a flight from Toronto to Atlanta last week, the pilot announced we had moved to a lower flight level because of staffing shortages in air traffic control! When do planes start flying with hazard flights flashing...

Sad the #bluejays lost but honestly could not have handled another extra inning game, especially after the clocks changed

This motion is very disturbing, and I very much hope it won't pass, but in my reading of the text, I only see mention of access to the identity, comments, and scores of the evaluation committee, not to peer reviewers. Either way, demanding access to this information is very problematic

Happy Thanksgiving!

Happy holidays to all who celebrate 🌰

Thanks for these amazing quotes that I will use in class next week to further discourage the use of AI!

Matte black Carrera bicycle with paniers in foreground of lighthouse of Leslie Spit

Farewell to my trusty steed (who was apparently liberated by a stranger on Front Street last night)! I bought her at a Halfords during my postdoc in the UK 20 years ago and we spent so much time together (especially during the pandemic) in and around Toronto #biketo