Dylan B. Millet @dbm.bsky.social · 17/08/2026With major contributions from Glenn Wolfe, Erin Delaria, Julian Deventer, Markus Müller, Arne Schiller, Lee Thornhill, and Armin Wisthaler 020
Dylan B. Millet @dbm.bsky.social · 17/08/2026TL/DR: instrument noise is a big limitation! A relatively modest noise reduction compared to current capabilities would go a long way in improving the utility of eddy covariance for this application 120
Dylan B. Millet @dbm.bsky.social · 17/08/2026Eddy covariance has seen broad application over land, but not for air-sea exchange of organics where fluxes are usually weak and challenge instrument detection limits. Xin's work shows how instrument noise and turbulence interact to determine what we can/cannot measure in this way. 110
Dylan B. Millet @dbm.bsky.social · 17/08/2026Ocean-air exchange is a major source (and sink!) for many important atmospheric organic compounds, but these fluxes are poorly understood. In this paper, Xin explores the capabilities and limitations of the eddy covariance technique for directly measuring these exchange rates. 110
Dylan B. Millet @dbm.bsky.social · 17/08/2026New paper out in Atmos. Meas. Tech. by lead author Xin Chen 🧪 Airborne eddy covariance measurements of ocean-air VOC fluxes: Distinguishing signal from noise amt.copernicus.org/articles/19/...amt.copernicus.orgAirborne eddy covariance measurements of ocean-air VOC fluxes: Distinguishing signal from noiseAbstract. Ocean-atmosphere exchange plays an important but uncertain role for many volatile organic compounds (VOCs). Airborne eddy covariance (EC) enables direct flux quantification over large areas,... 1102
Dylan B. Millet @dbm.bsky.social · 08/08/2026Scenes from the Telluride Workshops 2026. If you know these people you may be an atmospheric chemist 🧪 0161
Reposted by Dylan B. MilletAtmChemAerosolJobs @atmchemaerojobs.bsky.social · 13/07/2026Postdoc in Atmospheric Science and Machine Learning at SRON, Leiden, on Carbon Monoxide emissions from cities and steel plants using TROPOMI satellite observations: werkenbijsron.nl/en/vacancies...werkenbijsron.nlPost-Doc in Atmospheric Science and Machine Learning 021
Dylan B. Millet @dbm.bsky.social · 13/07/2026That is actually uncanny. If female, may I suggest the name "Flo" 020
Reposted by Dylan B. MilletHannah S Kenagy @hannahskenagy.bsky.social · 16/06/2026The Kenagy and Millet Labs at UMN are hiring a postdoc to deploy mass spectral instruments on a new mobile lab focused on air composition, air quality, and environmental justice. Details at z.umn.edu/bdjg. Contact Hannah (hskenagy@umn.edu) & Dylan @dbm.bsky.social (dbm@umn.edu) with questions!z.umn.eduMobileLabPostdocAd-ConcisePostdoctoral Researcher The Kenagy Lab (Department of Chemistry; https://kenagy.chem.umn.edu/) and the Millet Lab (Department of Soil, Water, and Climate; https://atmoschem.umn.edu) at the University ... 045
Dylan B. Millet @dbm.bsky.social · 05/06/2026Her results confirm the idea that slower CH4 removal (due to reduced NOx) and a larger wetland source combined to drive the 2020 surge. I think her paper also highlights the critical value of comprehensive, multi-species satellite obs (UV/Vis/IR) for tracking our atmosphere and how its changing 000
Dylan B. Millet @dbm.bsky.social · 05/06/2026CH4, HCHO, and CO are thus linked by OH, and concurrent satellite obs of all 3 offer complementary info for parsing methane sources vs sinks. Here Xueying leverages that idea to investigate causes for the year-2020 methane acceleration. 100
Dylan B. Millet @dbm.bsky.social · 05/06/2026A challenge for understanding the atmospheric methane (CH4) budget lies in telling if concentration changes are due to its sources or sink (OH). The main sink? Reaction with OH, producing formaldehyde (HCHO). HCHO then reacts (partly with OH) to produce CO, which reacts with OH to produce CO2. 100
Dylan B. Millet @dbm.bsky.social · 05/06/2026New paper out in Earth’s Future by lead author @xueyingyu.bsky.social 🧪 Multi-species constraints resolve methane source versus sink changes: lessons from 2020 doi.org/10.1029/2025...doi.orgMulti‐Species Constraints Resolve Methane Source Versus Sink Changes: Lessons From 2020Combining satellite measurements of the methane-HCHO-CO oxidation chain with methyl chloroform data disentangles methane sources and sinks Year-2020 methane sources and sinks reveal simultaneous ... 172
Dylan B. Millet @dbm.bsky.social · 29/05/2026Tell me you don't understand how scientific research works without saying you don't understand how scientific research works 🧪 www.science.org/content/arti...science.orgU.S. researchers face new restrictions on publishing with foreign collaboratorsNIH, NASA grantees are confused and concerned amid agencies’ piecemeal communication 2115
Dylan B. Millet @dbm.bsky.social · 28/04/2026Touring the NASA P-3 research aircraft ... used for atmospheric chemistry and other important research on our home planet 🤓 🧪 0191
Dylan B. Millet @dbm.bsky.social · 08/04/2026Priority application deadline is April 20! 🧪 #ChemSky 052
Dylan B. Millet @dbm.bsky.social · 16/03/2026Postdoc 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!z.umn.eduPostdocAd-GXSPostdoctoral 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... 046
Dylan B. Millet @dbm.bsky.social · 15/03/2026If you are in Zürich and interested in this topic consider joining us at the Collegium Helveticum on Tuesday (5pm) collegium.ethz.ch/events/fello...collegium.ethz.ch📅 Tracking Atmospheric Change from Space | Collegium HelveticumEarth’s atmosphere is undergoing rapid and far-reaching change, with consequences that extend from local air quality to the global climate system. The … 042
Dylan B. Millet @dbm.bsky.social · 17/02/2026With Kelley Wells, @jaredbrewer.bsky.social, Julieta Juncosa Calahorrano, Vivienne Payne, Joe Taylor, Dave Tobin 000
Dylan B. Millet @dbm.bsky.social · 17/02/2026Results reveal clear wildfire VOC enhancements and track the ensuing plume evolution. The study provides a foundation for future aircraft-based remote sensing. It also shows that instrument noise is a critical factor for future IR sounders to enable trace gas measurements 110
Dylan B. Millet @dbm.bsky.social · 17/02/2026Fires are a global source of atmospheric volatile organic compounds (VOCs). Airborne remote sensing offers a new way to map these emissions and understand impacts. Chengyuan developed the first VOC retrieval for an aircraft-based IR sounder and used it to map fire VOC emissions in the western US! 110
Dylan B. Millet @dbm.bsky.social · 17/02/2026New group paper from Chengyuan Hu! First Aircraft-Based VOC Measurements Using Thermal Infrared Remote Sensing dx.doi.org/10.1029/2025...dx.doi.orgFirst Aircraft‐Based VOC Measurements Using Thermal Infrared Remote Sensing: Mapping Fire Plumes With the Scanning High‐Resolution Interferometer Sounder (S‐HIS)Wildfires release a wide range of gases that are poorly quantified but strongly influence air quality and human health We show that aircraft-based infrared remote sensing can be used to map key w... 161
Dylan B. Millet @dbm.bsky.social · 11/02/2026Two new faculty openings at U. Minnesota 🧪 Assist. Prof. in Climate Science hr.myu.umn.edu/jobs/ext/372... Questions: Tim Griffis, tgriffis@umn.edu Assist. Prof. in Soil Physics / Ecohydrology / Hydropedology hr.myu.umn.edu/jobs/ext/372... Questions: David Mulla, mulla003@umn.edu Due March 13 067
Dylan B. Millet @dbm.bsky.social · 08/12/2025Group photo! With special guests Mr. & Mrs. C, Chewy, and Brent 140
Reposted by Dylan B. Milletjuli g pausas @jgpausas.bsky.social · 02/12/2025The new Global Fire Emissions Database (GFED5, 2002–2022) shows that at the global scale 1) by far, most area burned are grasslands; 2) area burned is declining; & 3) fuel consumption is increasing: ie, fires are increasing in forests & encroached grasslands. www.nature.com/articles/s41... 🧪🌍🔥🌳🌐 04019
Dylan B. Millet @dbm.bsky.social · 25/11/2025Job openings: sustainability research profs at the UMN Institute on the Environment: drive.google.com/file/d/1L5gp...drive.google.comUMN IonE - Interdisciplinary Sustainability Research Professors.png 021
Dylan B. Millet @dbm.bsky.social · 20/11/2025My main question for this mass-based scholarly index is whether it can include the SI sections www.nature.com/articles/d41... 120
Dylan B. Millet @dbm.bsky.social · 20/11/2025Postdoc opening: airborne NH3 measurements Join our team! The UMN atmospheric chemistry group is recruiting a postdoc to collect and analyze airborne NH3 measurements as part of NASA FarmFlux. See z.umn.edu/aw67 for details, & contact Julieta (junco004@umn.edu) and I (dbm@umn.edu) with questions!z.umn.eduPostdocAd-FarmFluxPostdoctoral Associate: aircraft-based measurements of atmospheric ammonia Join our team! The atmospheric chemistry group at the University of Minnesota (UMN) seeks applications for a Postdoctoral A... 01111
Reposted by Dylan B. MilletEmily Barnes Franklin, PhD @emfranklin.bsky.social · 01/10/2025Out this week in npj Climate and Atmospheric Science: VCPs, biogenic VOCs and traditional anthropogenic PM respond to heat and smoke to drive summer PM pollution outside NYC, highlighting vulnerabilities of urban air quality under global change. @chemdelphine.bsky.social @dbm.bsky.socialrdcu.beEmerging drivers of urban aerosol increase global change vulnerability in a US megacitynpj Climate and Atmospheric Science - Emerging drivers of urban aerosol increase global change vulnerability in a US megacity 0102
Reposted by Dylan B. MilletWilliam B. Fuckley @opinionhaver.bsky.social · 24/07/2025Some memes are relatable they aren’t even like funny, just actively insulting. 417212
Reposted by Dylan B. MilletJose D Fuentes @jdfuentes.bsky.social · 10/07/2025Save data provided by NASA's Earth Science Division, as outlined by a letter in Science magazine www.science.org/doi/10.1126/... @biometlab.bsky.social @paulstoy.bsky.social @dbm.bsky.social @agu.org @ametsoc.orgscience.orgNASA Earth Science Division provides key dataIn May, the US administration proposed budget cuts to NASA, including a more than 50% decrease in funding for the agency’s Earth Science Division (ESD) (1), the mission of which is to gather knowledge... 021
Dylan B. Millet @dbm.bsky.social · 10/07/2025A letter in Science about the importance of NASA Earth Science from several members of the recently-dissolved NASA Earth Science Advisory Committee. Out today online and in the 7/24 issue. www.science.org/doi/10.1126/... 072
Reposted by Dylan B. MilletSteve Brown @stevenslbrown.bsky.social · 11/04/2025Clouds darkening over NOAA research. We are slated for elimination in next years budget. Astonishing loss to the nation and the world if it happens. 102628
Dylan B. Millet @dbm.bsky.social · 27/03/2025And announced today, Stan was selected as one of the 2024 class of AAAS Fellows: www.aaas.org/programs/fel... Even though it only just became public, selections were made back in November so Stan did find out at that point.aaas.org2024 AAAS Fellows | American Association for the Advancement of Science (AAAS) 0122
Dylan B. Millet @dbm.bsky.social · 27/03/2025Sometimes you *should* meet your (science) heroes. Stan was a giant of chemical kinetics and just a gem of a person. We will miss him. 160
Dylan B. Millet @dbm.bsky.social · 13/03/2025Folks on this platform will readily think of many other examples. This type of research gives us information we need for smart, informed planning. We can have good-faith policy arguments about what to *do*, but choosing to be uninformed by not collecting data … is just failure. 040
Dylan B. Millet @dbm.bsky.social · 13/03/2025… and revealed the rising importance of non-transportation emissions for urban air quality. www.science.org/doi/full/10....science.orgVolatile chemical products emerging as largest petrochemical source of urban organic emissionsChemical products contribute as much organic air pollution as transportation emissions in many cities. 140
Dylan B. Millet @dbm.bsky.social · 13/03/2025… showed how declining transportation emissions have reduced smog (psst, the Clean Air Act works!) … doi.org/10.1029/2012...doi.orgMultiyear trends in volatile organic compounds in Los Angeles, California: Five decades of decreasing emissionsVOCs and CO have decreased by a large factor in LA since 1960s VOC emission ratios have not changed Rate of decrease in London is more rapid, but started later 140
Dylan B. Millet @dbm.bsky.social · 13/03/2025… showed how intercontinental transport affects US air quality … www.nature.com/articles/nat...nature.comIncreasing springtime ozone mixing ratios in the free troposphere over western North America - NatureHigh concentrations of ozone in the troposphere are toxic and act as a greenhouse gas. Anthropogenic emissions of ozone precursors have caused widespread increases in ozone concentrations since the la... 140
Dylan B. Millet @dbm.bsky.social · 13/03/2025… demonstrated how changing wildfire emissions are impacting air quality … doi.org/10.1029/2022...doi.orgFire Influence on Regional to Global Environments and Air Quality (FIREX‐AQ)This work is an overview of the NOAA/NASA Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) field experiment FIREX-AQ investigated biomass burning emissions and chemist... 140
Dylan B. Millet @dbm.bsky.social · 13/03/2025There has been way too much groundbreaking research from CSL to mention it all here. A couple examples that often come up in my work: CSL research helped show the role that natural VOCs play in ozone pollution (changes control strategies!) … www.nature.com/articles/329...nature.comModels and observations of the impact of natural hydrocarbons on rural ozone - NatureNature - Models and observations of the impact of natural hydrocarbons on rural ozone 150
Dylan B. Millet @dbm.bsky.social · 13/03/2025CSL is a NOAA lab that has been foundational in atmospheric chemistry & air quality science. They are now losing young scientists that are among the best/brightest of the next generation. This degrades not just CSL but our ability to track pollution & protect health. csl.noaa.govcsl.noaa.govNOAA Chemical Sciences LaboratoryNOAA CSL: Advancing scientific understanding of the chemical and physical processes that affect Earth's atmospheric composition and climate. 13013
Dylan B. Millet @dbm.bsky.social · 13/03/2025These were *volunteer* science advisory committees that provided NASA with independent perspective and community guidance ... explain to me how eliminating these is a way to "reduce waste and abuse" 0114
Reposted by Dylan B. MilletDr. Lucky Tran @luckytran.com · 25/02/2025The #standupforscience2025 rallies will be held in DC and around the U.S. NEXT FRIDAY. Please sign up to attend at standupforscience2025.org To effectively push back the attacks on science happening now, it is so critical to show mass support for science by gathering together in the streets! 211153
