From ab5ba95bb9f805316eea03970d340bd9b93a6972 Mon Sep 17 00:00:00 2001 From: Lixu Jin <32994828+jinlx@users.noreply.github.com> Date: Fri, 31 Jul 2026 18:53:21 -0400 Subject: [PATCH] Align sitewide research narrative --- _data/navigation.yml | 2 +- _pages/about.md | 28 ++++++++++++++-------------- _pages/cv.md | 15 +++++++-------- _pages/presentations.md | 3 ++- _pages/publications.md | 24 +++++++++++++----------- _pages/research.md | 32 +++++++++++++++++++++----------- _pages/sitemap.md | 2 +- 7 files changed, 59 insertions(+), 47 deletions(-) diff --git a/_data/navigation.yml b/_data/navigation.yml index f7d955d..23e7f55 100644 --- a/_data/navigation.yml +++ b/_data/navigation.yml @@ -6,7 +6,7 @@ main: - title: "Publications" url: /publications/ - - title: "Presentations" + - title: "Talks & Posters" url: /presentations/ - title: "CV" diff --git a/_pages/about.md b/_pages/about.md index ae4f2c6..1e5abed 100644 --- a/_pages/about.md +++ b/_pages/about.md @@ -8,26 +8,26 @@ redirect_from: - /about.html --- -I am a postdoctoral scholar at Rutgers University in [Prof. Xiaomeng Jin's group](https://scholar.google.com/citations?user=RoWh6MEAAAAJ). I study how wildfire emissions and atmospheric chemistry shape air quality and public-health risks, combining satellite, aircraft, and surface observations with chemical transport models, box models, and data-driven methods. +I am a postdoctoral scholar at Rutgers University in [Prof. Xiaomeng Jin's group](https://scholar.google.com/citations?user=RoWh6MEAAAAJ). I study how wildfire emissions, atmospheric chemistry, and transport shape air quality and public-health risks. I earned my Ph.D. in Chemistry from the University of Montana, where I worked with [Prof. Lu Hu](https://scholar.google.com/citations?user=7WP7T3QAAAAJ&hl=en) and [Prof. Robert Yokelson](https://scholar.google.com/citations?user=aHNl6RwAAAAJ&hl=en) on wildfire VOC emissions and smoke photochemistry. I received my B.S. in Atmospheric Science (Honors) from Lanzhou University and was a visiting student in [Prof. Dan Jaffe's group](https://scholar.google.com/citations?user=iDUkPfAAAAAJ&hl=en) at the University of Washington. -## Research focus +## Research questions -- **Wildfire emissions:** Constraining VOC and OVOC emissions with WE-CAN, FIREX-AQ, surface observations, and GEOS-Chem. -- **Fresh-smoke chemistry:** Diagnosing OH-ozone-PAN chemistry, chemical-mechanism gaps, and ozone-production regimes. -- **Smoke aging:** Distinguishing OH exposure, photochemical age, physical transport time, dilution, and background mixing. -- **Ozone sensitivity:** Constructing and interpreting VOC-NOx ozone isopleths under controlled chemical and meteorological conditions. -- **Satellite integration:** Developing satellite-sampled along-plume and cross-plume transects using TROPOMI and TEMPO together with winds, plume height, retrieval sensitivity, and model sampling. -- **Plumes to people:** Connecting smoke composition and model bias to exposure and public-health metrics beyond PM2.5 mass alone. - -My work uses [GEOS-Chem](https://geoschem.github.io/) for regional-to-global chemical transport modeling and [F0AM](https://sites.google.com/site/wolfegm/models) for detailed box-model and mechanism analysis. The goal is to make wildfire-smoke predictions more chemically realistic, observationally constrained, and useful for health applications. - -You can download my [current CV](/files/CV_Lixu.pdf), explore my [research](/research/), browse [publications](/publications/), or view recent [talks and posters](/presentations/). My ORCID is [0000-0003-1346-5352](https://orcid.org/0000-0003-1346-5352). Please [contact me](/contact/) if you would like to discuss research or collaboration. +- **Wildfire emissions:** How accurately are the magnitude and chemical diversity of wildfire emissions represented in atmospheric models? +- **Smoke evolution:** How does smoke chemistry change from fresh plumes to aged downwind air masses? +- **Chemical mechanisms:** Which missing reactive-VOC pathways matter for smoke oxidation and secondary pollution? +- **Exposure and health:** Which pollutants reach communities after smoke ages, and how do they shape health risks? From plumes to people: integrating observations and models to understand wildfire-smoke impacts. + +Across these questions, I integrate aircraft, surface, and satellite observations with GEOS-Chem, CMAQ, chemical box models, trajectory analysis, and data-driven methods. + +[Research](/research/){: .btn .btn--primary } +[Publications](/publications/){: .btn .btn--primary } +[Download CV](/files/CV_Lixu.pdf){: .btn .btn--primary } diff --git a/_pages/cv.md b/_pages/cv.md index f37633a..3cde5f9 100644 --- a/_pages/cv.md +++ b/_pages/cv.md @@ -3,9 +3,10 @@ layout: single title: "Curriculum Vitae" permalink: /cv/ author_profile: true +excerpt: "Academic CV of Lixu Jin, a postdoctoral atmospheric chemist studying wildfire smoke, air quality, and health impacts." --- -###### *Updated: July 31, 2026* +*Updated July 31, 2026* [Download the current CV (PDF)](/files/CV_Lixu.pdf){: .btn .btn--primary } @@ -23,17 +24,15 @@ Focus: wildfire-smoke chemistry, satellite-observation integration, air quality, ## Research expertise -- Wildfire VOC and OVOC emissions -- Fresh- and aged-smoke atmospheric chemistry -- OH exposure and photochemical-age diagnostics -- VOC-NOx ozone isopleths and ozone-production regimes -- Satellite-sampled along-plume and cross-plume transects -- GEOS-Chem, F0AM, HYSPLIT, and model-to-observation sampling +- Wildfire-emission constraints and model evaluation +- Fresh- and aged-smoke chemistry, including ozone formation and chemical aging +- Chemical-mechanism development for reactive wildfire VOCs +- Aircraft, surface, and satellite integration for regional plume analysis - Chemically resolved exposure and public-health assessment +- GEOS-Chem, CMAQ, F0AM, HYSPLIT, and model-to-observation sampling ## Selected appointments -- **2026-present:** Postdoctoral Scholar, Rutgers University - **2019-2025:** Teaching and Graduate Research Assistant, University of Montana - **2018:** Visiting Student, University of Washington - **2016-2019:** Undergraduate Research Assistant, Lanzhou University diff --git a/_pages/presentations.md b/_pages/presentations.md index 5b2dba9..4243f27 100644 --- a/_pages/presentations.md +++ b/_pages/presentations.md @@ -2,9 +2,10 @@ title: "Talks & Posters" permalink: /presentations/ author_profile: true +excerpt: "Invited talks, conference presentations, and posters on wildfire smoke, atmospheric chemistry, and air quality." --- -###### *Updated: July 31, 2026* +*Updated July 31, 2026* ## Invited Talks - **L. Jin** (2027, title forthcoming): Invited presentation in the Regional Air Quality session. *[29th Conference on Atmospheric Chemistry, 107th AMS Annual Meeting](https://annual.ametsoc.org/2027/program-events/conferences-and-symposia/29th-conference-on-atmospheric-chemistry/), Denver, CO, January 10-14, 2027.* diff --git a/_pages/publications.md b/_pages/publications.md index a9b3d32..b5a0894 100644 --- a/_pages/publications.md +++ b/_pages/publications.md @@ -1,28 +1,30 @@ --- -title: "Representative Publications" +title: "Selected Publications" permalink: /publications/ author_profile: true +excerpt: "Selected peer-reviewed studies of wildfire emissions, smoke chemistry, atmospheric modeling, and air quality." --- -###### *Updated: July 31, 2026* -###### \* Corresponding author +*Updated July 31, 2026 · \* Corresponding author* -## In production +## Accepted / in production -- **Jin, L.\***, Tan, L., Ketcherside, D. T., Selimovic, V., Nauman, K., Yokelson, R. J., and Hu, L. (2026): Characterizing emissions, chemistry, and health impacts of aged wildfire smoke in a western US city. *Atmospheric Chemistry and Physics*, in production. [[preprint](https://egusphere.copernicus.org/preprints/2026/egusphere-2026-114/)] [[data](https://zenodo.org/records/18209325)] [[code](https://github.com/jinlx/Aged-wildfire-smoke-emission-chemistry-health)] +- **Jin, L.\***, *et al.* (2026). Characterizing emissions, chemistry, and health impacts of aged wildfire smoke in a western US city. *Atmospheric Chemistry and Physics*, accepted, in production. [Preprint](https://egusphere.copernicus.org/preprints/2026/egusphere-2026-114/) · [Data](https://zenodo.org/records/18209325) · [Code](https://github.com/jinlx/Aged-wildfire-smoke-emission-chemistry-health) ## Peer-reviewed -- **Jin, L.\***, *et al.* (2026): Ozone photochemistry in fresh biomass burning smoke over the United States. *Science Advances*, 12, eads2157. [[paper](https://doi.org/10.1126/sciadv.ads2157)] [[data](https://doi.org/10.5281/zenodo.18226363)] [[code](https://github.com/jinlx/Fresh-smoke-chemistry-packages)] [[NSF feature](https://www.nsf.gov/geo/updates/researchers-improve-ability-predict-wildfire-smoke-impacts)] [[NBC Montana](https://nbcmontana.com/newsletter-daily/um-graduate-publishes-in-science-advances)] [[UM News](https://www.umt.edu/news/2026/03/030326smok.php)] [[WeChat feature](https://mp.weixin.qq.com/s/LuKFe-23Xa6CxjPyr1epcg)] +- **Jin, L.\***, *et al.* (2026). Ozone photochemistry in fresh biomass burning smoke over the United States. *Science Advances*, 12, eads2157. [Paper](https://doi.org/10.1126/sciadv.ads2157) · [Data](https://doi.org/10.5281/zenodo.18226363) · [Code](https://github.com/jinlx/Fresh-smoke-chemistry-packages) -- **Jin, L.\***, *et al.* (2023): Constraining emissions of volatile organic compounds from western US wildfires with WE-CAN and FIREX-AQ airborne observations. *Atmospheric Chemistry and Physics*, 23, 5969-5991. [[paper](https://doi.org/10.5194/acp-23-5969-2023)] [[data](https://doi.org/10.5281/zenodo.15021583)] [[code](https://github.com/jinlx/Western-US-emission-packages)] [[NOAA Climate.gov feature](https://www.climate.gov/news-features/feed/understanding-volatile-organic-compound-emissions-wildfires-western-united)] + **Media:** [NSF](https://www.nsf.gov/geo/updates/researchers-improve-ability-predict-wildfire-smoke-impacts) · [UM News](https://www.umt.edu/news/2026/03/030326smok.php) · [NBC Montana](https://nbcmontana.com/newsletter-daily/um-graduate-publishes-in-science-advances) · [Chinese-language feature](https://mp.weixin.qq.com/s/LuKFe-23Xa6CxjPyr1epcg) -- Permar, W., **Jin, L.**, *et al.* (2023): Atmospheric OH reactivity in the western United States determined from comprehensive gas-phase measurements during WE-CAN. *Environmental Science: Atmospheres*, 3, 97-114. [[paper](https://doi.org/10.1039/D2EA00063F)] +- Cope, E. M., Ketcherside, D. T., **Jin, L.**, *et al.* (2024). Sources of atmospheric volatile organic compounds during the Salt Lake regional Smoke, Ozone and Aerosol Study (SAMOZA) 2022. *Journal of Geophysical Research: Atmospheres*, 129, e2024JD041640. [Paper](https://doi.org/10.1029/2024JD041640) -- Permar, W., Wielgasz, C., **Jin, L.**, *et al.* (2023): Assessing formic and acetic acid emissions and chemistry in western U.S. wildfire smoke: implications for atmospheric modeling. *Environmental Science: Atmospheres*, 3, 1620-1641. [[paper](https://doi.org/10.1039/D3EA00098B)] +- Jaffe, D. A., *et al.* (including **Jin, L.**) (2024). Key results from the Salt Lake regional Smoke, Ozone and Aerosol Study (SAMOZA). *Journal of the Air & Waste Management Association*, 74, 1–18. [Paper](https://doi.org/10.1080/10962247.2024.2301956) -- Cope, E. M., Ketcherside, D. T., **Jin, L.**, *et al.* (2024): Sources of atmospheric volatile organic compounds during the Salt Lake regional Smoke, Ozone and Aerosol Study (SAMOZA) 2022. *Journal of Geophysical Research: Atmospheres*, 129, e2024JD041640. [[paper](https://doi.org/10.1029/2024JD041640)] +- **Jin, L.\***, *et al.* (2023). Constraining emissions of volatile organic compounds from western US wildfires with WE-CAN and FIREX-AQ airborne observations. *Atmospheric Chemistry and Physics*, 23, 5969–5991. [Paper](https://doi.org/10.5194/acp-23-5969-2023) · [Data](https://doi.org/10.5281/zenodo.15021583) · [Code](https://github.com/jinlx/Wildfire-pollutants-emission-packages) · [NOAA Climate.gov feature](https://www.climate.gov/news-features/feed/understanding-volatile-organic-compound-emissions-wildfires-western-united) -- Jaffe, D. A., *et al.* (including **Jin, L.**) (2024): Key results from the Salt Lake regional Smoke, Ozone and Aerosol Study (SAMOZA). *Journal of the Air & Waste Management Association*, 74, 1-18. [[paper](https://doi.org/10.1080/10962247.2024.2301956)] +- Permar, W., **Jin, L.**, *et al.* (2023). Atmospheric OH reactivity in the western United States determined from comprehensive gas-phase measurements during WE-CAN. *Environmental Science: Atmospheres*, 3, 97–114. [Paper](https://doi.org/10.1039/D2EA00063F) + +- Permar, W., Wielgasz, C., **Jin, L.**, *et al.* (2023). Assessing formic and acetic acid emissions and chemistry in western U.S. wildfire smoke: implications for atmospheric modeling. *Environmental Science: Atmospheres*, 3, 1620–1641. [Paper](https://doi.org/10.1039/D3EA00098B) For a fuller publication record, see my [ORCID profile](https://orcid.org/0000-0003-1346-5352) or download my [CV](/files/CV_Lixu.pdf). diff --git a/_pages/research.md b/_pages/research.md index 7b7b2aa..5d9df3e 100644 --- a/_pages/research.md +++ b/_pages/research.md @@ -2,41 +2,51 @@ title: "Research" permalink: /research/ author_profile: true +excerpt: "Four connected studies of wildfire-smoke emissions, evolving chemistry, chemical mechanisms, and health impacts." redirect_from: - /researches/ --- ## From plumes to people -Wildfire smoke is not a single pollutant. Its air-quality and health impacts depend on what fires emit, how those emissions react and mix during transport, where secondary pollutants such as ozone form, and what ultimately reaches communities. I combine aircraft, surface, and satellite observations with chemical box models and three-dimensional atmospheric models to answer four connected questions spanning wildfire emissions, smoke chemistry, regional air quality, and human exposure. +Wildfire smoke is not a single pollutant. Its air-quality and health impacts depend on what fires emit, how those emissions react and mix during transport, where secondary pollutants such as ozone form, and what ultimately reaches communities. I combine aircraft, surface, and satellite observations with chemical box models and three-dimensional atmospheric models to answer four connected questions across the wildfire-smoke source-to-receptor continuum. -## Wildfire emissions are systematically underestimated +From plumes to people: aircraft, surface, and satellite observations connected with atmospheric models to understand wildfire-smoke impacts. + +*Emissions · Smoke evolution · Furanoid chemistry · Exposure and health* + +## 1. Wildfire emissions are systematically underestimated **Research question.** Are the magnitude and chemical diversity of wildfire emissions accurately represented in atmospheric models? **Approach.** I combine satellite-derived fire inventories with aircraft observations of fresh plumes, ground measurements of multi-day-old smoke, and GEOS-Chem sensitivity simulations. -**Key finding.** For western U.S. fires, widely used inventories underestimated primary wildfire emissions by about a factor of three, while the VOC species represented in GEOS-Chem accounted for only about half of the measured VOC emission burden. Correcting both biases raised the estimated wildfire contribution to 45% of western U.S. primary VOC emissions during the active 2018 fire season—comparable to biogenic emissions and about five times anthropogenic emissions. +**Key finding.** For western U.S. fires, widely used inventories underestimated primary wildfire emissions by about a factor of three, while the volatile organic compounds (VOCs) represented in GEOS-Chem accounted for only about half of the measured VOC emission burden. Correcting both biases raised the estimated wildfire contribution to 45% of western U.S. primary VOC emissions during the active 2018 fire season—comparable to biogenic emissions and about five times anthropogenic emissions. **Implication.** Standard models therefore understate wildfire contributions to regional air pollution and downwind exposure. Correcting emissions improves primary gases in aged smoke, but accurate air-quality and health predictions also require improved VOC chemistry and aerosol representation. **Related publications.** [Jin et al., 2023, *ACP*](https://doi.org/10.5194/acp-23-5969-2023) · [Jin et al., 2026, *ACP* (accepted; preprint)](https://doi.org/10.5194/egusphere-2026-114) -## Wildfire smoke chemistry evolves rapidly during transport +## 2. Wildfire smoke chemistry evolves rapidly during transport **Research question.** How does wildfire smoke chemistry evolve from fresh plumes to aged downwind air masses, and do atmospheric models capture that evolution? **Approach.** I combine aircraft and ground-based observations with chemical box models, chemical-age diagnostics, and three-dimensional atmospheric modeling. -**Key finding.** Chemical aging explained 40–70% of the variability among fires in VOC oxidation and ozone and PAN production, while ozone formation shifted from usually VOC-limited during the first two hours to NOₓ-limited downwind. In multi-day-old smoke, GEOS-Chem overestimated OH exposure by about twofold, removed reactive VOCs too rapidly, and missed substantial secondary oxygenated-VOC production. +**Key finding.** Chemical aging explained 40–70% of the variability among fires in VOC oxidation and in ozone and peroxyacetyl nitrate (PAN) production, while ozone formation shifted from usually VOC-limited during the first two hours to nitrogen-oxide (NOₓ)-limited conditions downwind. In multi-day-old smoke, GEOS-Chem overestimated hydroxyl-radical (OH) exposure by about twofold, removed reactive VOCs too rapidly, and missed substantial secondary oxygenated-VOC production. **Implication.** Predicting downwind ozone and chemical exposure requires models to represent both the initial wildfire VOC mixture and its evolving chemistry throughout transport. -**Related publications.** [Jin et al., 2026, Science Advances](https://doi.org/10.1126/sciadv.ads2157) · [Jin et al., 2026, ACP (accepted; preprint)](https://doi.org/10.5194/egusphere-2026-114) +**Related publications.** [Jin et al., 2026, *Science Advances*](https://doi.org/10.1126/sciadv.ads2157) · [Jin et al., 2026, *ACP* (accepted; preprint)](https://doi.org/10.5194/egusphere-2026-114) **Current direction.** I am extending this plume-scale framework to regional ozone using satellite and surface observations, trajectory analysis, and CMAQ. -## Resolving the atmospheric chemistry of wildfire-emitted furanoids +## 3. Resolving the atmospheric chemistry of wildfire-emitted furanoids **Research question.** How do wildfire-emitted furanoids oxidize and contribute to secondary pollutants, and how should their chemistry be represented in atmospheric models? @@ -46,18 +56,18 @@ Wildfire smoke is not a single pollutant. Its air-quality and health impacts dep **Implication.** Resolving furanoid emissions and chemistry addresses a specific model gap identified in both fresh- and aged-smoke evaluations and can improve predictions of smoke oxidation and secondary pollution. -**Related work.** [Jin et al., 2026, Science Advances](https://doi.org/10.1126/sciadv.ads2157) · [Permar et al., 2023, Environmental Science: Atmospheres](https://doi.org/10.1039/D2EA00063F) · Furanoid mechanism manuscript in preparation +**Related public work.** [Jin et al., 2026, *Science Advances*](https://doi.org/10.1126/sciadv.ads2157) · [Permar et al., 2023, *Environmental Science: Atmospheres*](https://doi.org/10.1039/D2EA00063F) · [AGU 2024 abstract](https://agu.confex.com/agu/agu24/meetingapp.cgi/Paper/1649115) · [IGC11 presentation](https://drive.google.com/file/d/1k07wsJk6IO2TytaaRB1hi7lyWq-ynW2L/view) · Furanoid mechanism manuscript in preparation -## Aged wildfire smoke poses substantial downwind health risks +## 4. Aged wildfire smoke exposes communities to particles and hazardous gases **Research question.** What reaches communities after wildfire smoke has aged, and which pollutants drive its health risks? **Approach.** I combine long-term air-quality records, hourly measurements of 75 VOCs, chemical transport modeling, and toxicity-based exposure metrics. -**Key finding.** Multi-day-old smoke increased CO, PM₂.₅, and measured VOCs by factors of 2–8. PM₂.₅ accounted for about 90% of the estimated cancer risk, whereas hazardous air pollutants—including formaldehyde, benzene, acrolein, and acetaldehyde—dominated noncancer risks. +**Key finding.** Multi-day-old smoke increased CO, fine particulate matter (PM₂.₅), and measured VOCs by factors of 2–8. PM₂.₅ accounted for about 90% of the estimated cancer risk, whereas hazardous air pollutants—including formaldehyde, benzene, acrolein, and acetaldehyde—dominated noncancer risks. **Implication.** PM₂.₅-based assessments capture most of the estimated cancer risk but miss the gaseous hazardous air pollutants that dominate noncancer risk. Chemically resolved observations and improved atmospheric models are therefore needed for a more complete assessment of wildfire-smoke exposure. -**Related publication.** [Jin et al., 2026, ACP (accepted; preprint)](https://doi.org/10.5194/egusphere-2026-114) +**Related publication.** [Jin et al., 2026, *ACP* (accepted; preprint)](https://doi.org/10.5194/egusphere-2026-114) If you are interested in collaboration on wildfire emissions, smoke chemistry, satellite integration, atmospheric modeling, or exposure and health applications, please use my [contact page](/contact/). diff --git a/_pages/sitemap.md b/_pages/sitemap.md index e81a0ed..8ef34c8 100644 --- a/_pages/sitemap.md +++ b/_pages/sitemap.md @@ -12,7 +12,7 @@ A concise directory of the site's current content. An [XML sitemap]({{ base_path - [Home]({{ base_path }}/) - [Research]({{ base_path }}/research/) - [Publications]({{ base_path }}/publications/) -- [Presentations]({{ base_path }}/presentations/) +- [Talks & Posters]({{ base_path }}/presentations/) - [Curriculum Vitae]({{ base_path }}/cv/) - [Contact]({{ base_path }}/contact/) - [Beyond Research]({{ base_path }}/activities/)