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Colette Heald

@coletteheald.bsky.social

Canadian 🇨🇦, ETH professor🇨🇭, atmospheric chemist, researcher, educator, wanderer, and wonderer

74 Posts4982 Follower299 Folgt
Colette Heald@coletteheald.bsky.social · last mo.

My group's first foray into column modeling was published yesterday! Flossie looked at how much soil NOx and BVOCs escape the Amazon forest canopy and what controls ozone within the canopy. acp.copernicus.org/articles/26/...

Linking in-canopy chemistry to above-canopy O3, BVOCs, and NOx gas fluxes in the Amazon rainforest

Abstract. The forest canopy is a distinct chemical and dynamical environment compared to the atmosphere above, characterised by natural emissions, deposition processes, and chemistry that vary with he...

acp.copernicus.org

Colette Heald@coletteheald.bsky.social · 2mo ago

Last week my group hosted the first Swiss Atmospheric Chemistry Poster Day at ETH! A great opportunity to meet colleagues and initiate new collaborations. Thanks to wonderful postdocs Clara (second from the left) and Flossie (first on the right) for all their work planning this event!

BildBild
Colette Heald@coletteheald.bsky.social · 3mo ago

First first-authored publication by a member of my new ETH group published this week. And appropriately it's about ozone in Switzerland! Led by postdoc Clara and built on a bachelor's thesis by Amanda. acp.copernicus.org/articles/26/...

Multi-decadal ozone air quality and the role of temperature in Switzerland during summertime

Abstract. Tropospheric ozone (O3) is a greenhouse gas and air pollutant. Despite efforts to control O3 precursor emissions, O3 levels frequently exceed the Swiss air quality standards. We present mult...

acp.copernicus.org

Colette Heald@coletteheald.bsky.social · 4mo ago

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/...

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).

pubs.acs.org

Dylan B. Millet@dbm.bsky.social · 5mo ago

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!

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...

z.umn.edu

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Vinayak Sinha@air9-vs.bsky.social · 6mo ago

Atmospheric Chemistry within the Earth System: Understanding Changes and Impacts 7-11 September 2026 @igacproject.org ABSTRACTS DUE 27 FEBRUARY 2026 Abstracts: icacgp-igac2026.org/abstract-sub... Registration: icacgp-igac2026.org/registration/ Star studded Keynote and invited speakers list!

Abstract Submission - iCACGP-IGAC 2026

Abstracts Submission Be part of the dynamic and engaging scientific program of iCACGP-IGAC 2026! Submit your abstract and share your

icacgp-igac2026.org

Scott Doney@scottdoney.bsky.social · 6mo ago

The @nasonline.org report provides a comprehensive overview of the science evidence linking greenhouse gas emissions to climate change impacts on human health and welfare www.nationalacademies.org/news/nationa...

National Academies Publish New Report Reviewing Evidence for Greenhouse Gas Emissions and U.S. Climate, Health, and Welfare

A new National Academies report reviews evidence gathered by the scientific community since 2009 on greenhouse gas emissions and their effects on U.S. climate, health, and welfare.

nationalacademies.org

Colette Heald@coletteheald.bsky.social · 6mo ago

I just learned about Goodhart's Law "When a measure becomes a target, it ceases to be a good measure". So relevant to negative trends in academic publishing as discussed here: thegradient.pub/over-optimiz...

Goodhart’s Law: Are Academic Metrics Being Gamed?

Publishing a paper in academia is challenging, stimulating, and a bit baffling. Challenging because the research might fail. Stimulating because research may start assuming one outcome and finish with...

thegradient.pub

Dr Dan Shugar 🇨🇦@watershedlab.bsky.social · 7mo ago

After reviewing nearly 200 applications from prospective grad students and postdocs over the past few months for a couple different 🧪⚒️ postings, here are some tips, at least as they apply to North American positions. I hope they help future applicants. Share with your networks. 🧵

David Ho@davidho.bsky.social · 8mo ago

Americans don't understand the big deal about electric kettles because we're on 120 VAC. Once we see how fast water boils at 230 VAC, there's no going back.