NEWS

Zach Watson's SO2 satellite paper is accepted by ACP. This paper compares surface SO2 concentrations estimated from OMI satellite data with GEOS-CHEM vs. machine learning methods. Congratulations Zach !! Keep doing good work. (Septemeber 2025)

Shanhu Lee attended the Gordon Conference on Atmospheric Chemistry (August 2025).

Our new manuscript, Oxygenated Organosulfates Are an Effective Nucleation Precursor in Mixed Biogenic and Anthropogenic Environments, by Tiszenkel et al. is under review for JRL. This is a collaboration work with Prof. Jonas Elm and his graduate student, Astrid Petersen. Preprint is available at ESS Open Access: DOI: 10.22541/essoar.175010749.91191342/v1. (June 2025)

Lee Tiszenkel's Houston NPF paper is published at Nature Communications Earth & Environment. Also see the news article related to this publication! Congratulations, Lee !! (May 2025)

Shanhu Lee gave three presentations at EGU 2025 meeting: on urban NPF, OOS, and OOM. (May 2025)

GWISE-2 is officially kicked off at U. Georgia under the direction of Dr. Rawad Saleh !! Thanks Vignesh Vasudevan-Geetha and Lee Tiszenkel for doing good work !! (April and May 2025)

Greta Hopf has accepted an offer from William & Marry for MS studies starting from this fall. Congratulations Greta !! (April 2025)

Congratulations to Zach Watson for successfully defending his thesis !! (February 2025)

We have conducted our second Houston NPF field study !! Good job, Lee Tiszenkel !!! (January and February 2025)

Zach Watson gave two presentations at the AMS 2025 Annual meeting on "Estimating Surface Sulfur Dioxide Concentrations over Eastern China Using OMI Satellite Data and Global Models" and "Using Machine Learning to Estimate Surface-Level Sulfur Dioxide Concentrations from Satellite-Based Measurements." (January 2025)

Greta Hopf has started her honor's thesis work at our lab. She will be looking at the nitrate CI-Api-TOF data for OOS (oxygenated organic sulfates). (January 2025)

Zach Watson gave a presentation at AGU 2024 fall meeting on "Estimating Surface Sulfur Dioxide Concentrations over Eastern China Using OMI Satellite Data and Global Models." (December 2025)

Lee Tiszenkel gave presentations at AGU 2024 fall meeting on "The Effects of Oxygenated Organics on Urban New Particle Formation" and "The Role of Organosulfates in Mixed Biogenic and Anthropogenic New Particle Formation" and "Multiphase Reaction Pathways for Formation of Oxygenated Organic Molecules in Biogenic New Particles." (December 2025)

Vignesh Vasudevan-Geetha gave a presentation at the AAAR Annual Meeting in Albuquerque on "Isomer identificaiton and formation pathways of oxygenated organic molecules (OOMs) in biogenic new particles". (October 2024)

Lee Tiszenkel gave two presentations at the AAAR Annual Meeting in Albuquerque: "Gas phase organosulfate and its role in aerosol nucleation" and "Urban new particle formation in Houston". (October 2024)

Lee Tiszenkel's paper on the measurements of urban ammonia and amines in Houston is published in Atmospheric Chemistry & Physics. (September 2024)

Our group is participating in the G-WISE project in collaboration with U. Georgia. We are studying organic aerosol properties and formation processes during the prescribed forest fire simulation experiments. (September 2024)

Vignesh Vasudevan-Geetha's first paper is under review at ACP: https://doi.org/10.5194/egusphere-2024-2454. He discusses particle-phase formation of OOMs in biogenic new particles. (August 2024)

Shanhu Lee attended the the Georgia Wildland-fire Simulation Experiment (G-WISE) workshop at University of Georgia. (May 2024)

Lee Tiszenkel presented new findings of biogenic NPF from the HrTOF-CIMS and UPLC-ESI Orbitrap MS/MS analyses during the Aerodyne CIMS user meeting. (May 2024)

Lee Tiszenkel's new paper on urban ammonia and amines in Houston is now at ACPD. (May 2024)

Robin Russo, our undergraduate researcher who has worked in our lab on LC-ESI Orbitrap high-resolution mass spectrometer from last August , will soon start her new position at the Alabama Department of Forensic Sciences as a Forensic Biologist in June. Congratulations, Robin !!! (April 2024)

Shanhu Lee gave a lecture during the U. Miama's CAST workshop on urban new particle formation. (January 2024)

Shanhu Lee gave a presentation in AGU Fall meeting on urban new particle formation. (December 2023)

Lee Tiszenkel successfully defended his dissertation. Congratulations, Dr. Tiszenkel !! (October 2023)

Vignesh Geetha gave a wonderful oral presentation on biogenic HOMs isomers and volatilities at the AAAR 2023 annual meeting. Congratulations, Vignesh !! (October 2023)

Shanhu Lee presented "Urban new particle formation in Houston" at the AAAR 2023 annual meeting. (October 2023)

Shanhu Lee presented Houston new particle formation work at the 2023 Joint ARM User Facility and ASR PI meeting. (August 2023)  

Shanhu Lee attended the 2023 Gordon Research Conference on Atmospheric Chemistry. (August 2023)

Welcome Zach Watson (MS student) and Robin Russo (undergraduate research assistant) who are joining our group. (August 2023)

Zach Watson's first paper "Effects of boundary layer dynamics and meteorology on ultrafine particle formation and growth" is published in Atmospheric Environment. (July 2023)

Our biogenic new particle formation paper is published in Geophysical Research Letters: "Synergetic effects of isoprene and HOx on biogenic new particle formation" by Tiszenkel and Lee. (July 2023)

Lee Tiszenkel presented a talk on "Urban Aerosol Nucleation in Houston" in the TRACER/ACPC meeting. (May 2023)

Vigneth Geetha joined the group as a PhD student. He will be working on multi-component aerosol nucleation studies. Welcome Vigneth! (January 2023)

Congratulations on Lee Tiszenkel for his AAAR Best Oral Presentation Award. He gave a presentation on "Indoor ammonia and amine measurements with CIMS" at the AAAR Annual Meeting. (October 2022)

Lee Tiszenkel gave a poster presentation on "Preliminary results of Houston ultrafine particle field campaign" at the AAAR Annual Meeting. (October 2022)

Shanhu Lee gave a presentation on "Effects of Isoprene on Biogenic New Particle Formation" at the AAAR Annual Meeting. (October 2022)

We are currently conducting the Houston-NPF campaign to study chemical mechanisms involved in urban ultrafine particle formation processes at the University of Houston campus in support of NSF. This is a 6-week long field study, in collaboration with Dr. Jimmy Flynn. (September 2022)

Andrew Girgis, a rising Junior with an engineering major, is working with Dr. Chang-Kown Kang on CFD simulations. (September 2022)

Editorial: Atmospheric aerosol particle formation and growth by Kanawade et al. is published in Front. Environ. Sci. (September 2022).

Shanhu Lee gave a presentation at the Gordon Research Conference for Molecular and Ion Clusters. (August 2022)

We are funded by NSF to study the formation and growth of urban ultrafine particles, in collaboration with the currently ongoing TRACER campaign. (July 2022)

New Particle Formation in the Atmosphere: From Molecular Clusters to Global Climate by Lee et al. in 2019 has become one of the top-10 most downloaded papers in the Journal of Geophysical Research - Atmosphere. (June 2022)

Two NSF REU students will conduct undergraduate research in our group this summer, Sameera White (from UAH) and Zach Watson (from FIT).  Sameera will be working on chemical composition analysis of gas- and aerosol-phase HOMs taken from FIGAERO-CI-APi-TOF. Zach will study the effects of meteorology on urban aerosol dynamics, in collaboration with Dr. Kevin Knupp. (May 2022) 

Sierra Latrello's MS thesis work "Indoor particulate matters measured in residential homes in the southeastern US; Effects of Pandemic lockdown and holiday cooking" is published for publication in Aerosol and Air Quality Research. Congratulations, Sierra!! (May 2022)

Onsite instrument training for FIGAERO-CI-APi-TOF took place at our lab between April 27-29. Dr. Jordan Krechmer taught five students, Lee Tiszenkel (UAH), Asadullah Shoaib (UAH), Ariana Deegan (U Georgia), Saeideh Mohammadi (U Iowa), and Mike Taylor (U Delaware), about the instrument principles, operations, troubleshoot, and data analysis. It is a very exciting experience for all students. (April 2022)

"Perspective on recent measurements of atmospheric reduced nitrogen compounds" is published in Frontiers in Environmental Science. (April 2022)

CI-APi-TOF (or HrTOF-CIMS) with FIGAERO arrived. (March 2022) 

 HPLC-Orbitrap mass spectrometer arrived. (March 2022)

Sameera White, a UAH honors student, joined the group as an undergraduate research assistant. Welcome, Sameera !! (January 2022)

Sierra Latrello received her MS degree. Congratulations, Sierra !! (December 2021)

Cheyenne Robb, an undergraduate research assistant, has graduated with a BS degree. Congratulations, Cheyenne !! (December 2021)

NSF MRI Grant for the acquisition of HrTOF-CIMS with FIGAERO (August 2021)

NSF Grant to study biogenic new particle formation under conditions relevant to mixed forests in the United States  (June 2021)

Our new manuscript, Oxygenated Organosulfates Are an Effective Nucleation Precursor in Mixed Biogenic and Anthropogenic Environments, by Tiszenkel et al. is under review for JRL. This is a collaboration work with Prof. Jonas Elm and his graduate student Astrid Petersen. Preprint is available at ESS Open Access. (June 2025)

Lee Tiszenkel's Houston NPF paper is published at Communications Earth & Environment. Congratulations, Lee !! (May 2025)

Shanhu Lee gave three presentations at EGU 2025 meeting: on urban NPF, OOS, and OOM. (May 2025)

GWISE-2 is officially kicked off at U. Georgia under the direction of Dr. Rawad Saleh !! Thanks Vignesh Vasudevan-Geetha and Lee Tiszenkel for doing good work !! (April and May 2025)

Zach Watson's SO2 satellite paper is under review for ACP. This paper compares surface SO2 concentrations estimated from OMI satellite data with GEOS-CHEM vs. machine learning methods. (April 2025)

Greta Hopf has accepted an offer from William & Marry for MS studies starting from this fall. Congratulations Greta !! (April 2025)

Congratulations to Zach Watson for successfully defending his thesis !! (February 2025)

We have conducted our second Houston NPF field study !! Good job, Lee Tiszenkel !!! (January and February 2025)

Zach Watson gave two presentations at the AMS 2025 Annual meeting on "Estimating Surface Sulfur Dioxide Concentrations over Eastern China Using OMI Satellite Data and Global Models" and "Using Machine Learning to Estimate Surface-Level Sulfur Dioxide Concentrations from Satellite-Based Measurements." (January 2025)

Greta Hopf has started her honor's thesis work at our lab. She will be looking at the nitrate CI-Api-TOF data for OOS (oxygenated organic sulfates). (January 2025)

Zach Watson gave a presentation at AGU 2024 fall meeting on "Estimating Surface Sulfur Dioxide Concentrations over Eastern China Using OMI Satellite Data and Global Models." (December 2025)

Lee Tiszenkel gave presentations at AGU 2024 fall meeting on "The Effects of Oxygenated Organics on Urban New Particle Formation" and "The Role of Organosulfates in Mixed Biogenic and Anthropogenic New Particle Formation" and "Multiphase Reaction Pathways for Formation of Oxygenated Organic Molecules in Biogenic New Particles." (December 2025)

Vignesh Vasudevan-Geetha gave a presentation at the AAAR Annual Meeting in Albuquerque on "Isomer identificaiton and formation pathways of oxygenated organic molecules (OOMs) in biogenic new particles". (October 2024)

Lee Tiszenkel gave two presentations at the AAAR Annual Meeting in Albuquerque: "Gas phase organosulfate and its role in aerosol nucleation" and "Urban new particle formation in Houston". (October 2024)

Lee Tiszenkel's paper on the measurements of urban ammonia and amines in Houston is published in Atmospheric Chemistry & Physics. (September 2024)

Our group is participating in the G-WISE project in collaboration with U. Georgia. We are studying organic aerosol properties and formation processes during the prescribed forest fire simulation experiments. (September 2024)

Vignesh Vasudevan-Geetha's first paper is under review at ACP: https://doi.org/10.5194/egusphere-2024-2454. He discusses particle-phase formation of OOMs in biogenic new particles. (August 2024)

Shanhu Lee attended the the Georgia Wildland-fire Simulation Experiment (G-WISE) workshop at University of Georgia. (May 2024)

Lee Tiszenkel presented new findings of biogenic NPF from the HrTOF-CIMS and UPLC-ESI Orbitrap MS/MS analyses during the Aerodyne CIMS user meeting. (May 2024)

Lee Tiszenkel's new paper on urban ammonia and amines in Houston is now at ACPD. (May 2024)

Robin Russo, our undergraduate researcher who has worked in our lab on LC-ESI Orbitrap high-resolution mass spectrometer from last August , will soon start her new position at the Alabama Department of Forensic Sciences as a Forensic Biologist in June. Congratulations, Robin !!! (April 2024)

Shanhu Lee gave a lecture during the U. Miama's CAST workshop on urban new particle formation. (January 2024)

Shanhu Lee gave a presentation in AGU Fall meeting on urban new particle formation. (December 2023)

Lee Tiszenkel successfully defended his dissertation. Congratulations, Dr. Tiszenkel !! (October 2023)

Vignesh Geetha gave a wonderful oral presentation on biogenic HOMs isomers and volatilities at the AAAR 2023 annual meeting. Congratulations, Vignesh !! (October 2023)

Shanhu Lee presented "Urban new particle formation in Houston" at the AAAR 2023 annual meeting. (October 2023)

Shanhu Lee presented Houston new particle formation work at the 2023 Joint ARM User Facility and ASR PI meeting. (August 2023)  

Shanhu Lee attended the 2023 Gordon Research Conference on Atmospheric Chemistry. (August 2023)

Welcome Zach Watson (MS student) and Robin Russo (undergraduate research assistant) who are joining our group. (August 2023)

Zach Watson's first paper "Effects of boundary layer dynamics and meteorology on ultrafine particle formation and growth" is published in Atmospheric Environment. (July 2023)

Our biogenic new particle formation paper is published in Geophysical Research Letters: "Synergetic effects of isoprene and HOx on biogenic new particle formation" by Tiszenkel and Lee. (July 2023)

Lee Tiszenkel presented a talk on "Urban Aerosol Nucleation in Houston" in the TRACER/ACPC meeting. (May 2023)

Vigneth Geetha joined the group as a PhD student. He will be working on multi-component aerosol nucleation studies. Welcome Vigneth! (January 2023)

Congratulations on Lee Tiszenkel for his AAAR Best Oral Presentation Award. He gave a presentation on "Indoor ammonia and amine measurements with CIMS" at the AAAR Annual Meeting. (October 2022)

Lee Tiszenkel gave a poster presentation on "Preliminary results of Houston ultrafine particle field campaign" at the AAAR Annual Meeting. (October 2022)

Shanhu Lee gave a presentation on "Effects of Isoprene on Biogenic New Particle Formation" at the AAAR Annual Meeting. (October 2022)

We are currently conducting the Houston-NPF campaign to study chemical mechanisms involved in urban ultrafine particle formation processes at the University of Houston campus in support of NSF. This is a 6-week long field study, in collaboration with Dr. Jimmy Flynn. (September 2022)

Andrew Girgis, a rising Junior with an engineering major, is working with Dr. Chang-Kown Kang on CFD simulations. (September 2022)

Editorial: Atmospheric aerosol particle formation and growth by Kanawade et al. is published in Front. Environ. Sci. (September 2022).

Shanhu Lee gave a presentation at the Gordon Research Conference for Molecular and Ion Clusters. (August 2022)

We are funded by NSF to study the formation and growth of urban ultrafine particles, in collaboration with the currently ongoing TRACER campaign. (July 2022)

New Particle Formation in the Atmosphere: From Molecular Clusters to Global Climate by Lee et al. in 2019 has become one of the top-10 most downloaded papers in the Journal of Geophysical Research - Atmosphere. (June 2022)

Two NSF REU students will conduct undergraduate research in our group this summer, Sameera White (from UAH) and Zach Watson (from FIT).  Sameera will be working on chemical composition analysis of gas- and aerosol-phase HOMs taken from FIGAERO-CI-APi-TOF. Zach will study the effects of meteorology on urban aerosol dynamics, in collaboration with Dr. Kevin Knupp. (May 2022) 

Sierra Latrello's MS thesis work "Indoor particulate matters measured in residential homes in the southeastern US; Effects of Pandemic lockdown and holiday cooking" is published for publication in Aerosol and Air Quality Research. Congratulations, Sierra!! (May 2022)

Onsite instrument training for FIGAERO-CI-APi-TOF took place at our lab between April 27-29. Dr. Jordan Krechmer taught five students, Lee Tiszenkel (UAH), Asadullah Shoaib (UAH), Ariana Deegan (U Georgia), Saeideh Mohammadi (U Iowa), and Mike Taylor (U Delaware), about the instrument principles, operations, troubleshoot, and data analysis. It is a very exciting experience for all students. (April 2022)

"Perspective on recent measurements of atmospheric reduced nitrogen compounds" is published in Frontiers in Environmental Science. (April 2022)

CI-APi-TOF (or HrTOF-CIMS) with FIGAERO arrived. (March 2022) 

 HPLC-Orbitrap mass spectrometer arrived. (March 2022)

Sameera White, a UAH honors student, joined the group as an undergraduate research assistant. Welcome, Sameera !! (January 2022)

Sierra Latrello received her MS degree. Congratulations, Sierra !! (December 2021)

Cheyenne Robb, an undergraduate research assistant, has graduated with a BS degree. Congratulations, Cheyenne !! (December 2021)

NSF MRI Grant for the acquisition of HrTOF-CIMS with FIGAERO (August 2021)

NSF Grant to study biogenic new particle formation under conditions relevant to mixed forests in the United States  (June 2021)