Personal profile
Education/Academic qualification
Chemistry, PhD, York University
1999 → 2005
Chemistry, PhD, York University
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Collaborations and top research areas from the last five years
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DMS Uplift by Tropical Cyclones as a Source of SO2 in the Upper Troposphere
Jiao, G., Lou, S., Liu, T., Lin, H., Wang, X., Pan, L. L., Hornbrook, R. S., Apel, E. C., Rollins, A. W., Thornberry, T. D., Viciani, S., D’Amato, F., Dong, X., Huang, X. & Ding, A., Apr 16 2026, In: Geophysical Research Letters. 53, 7, e2025GL119981.Research output: Contribution to journal › Article › peer-review
Open Access -
Incorporating Gas-Phase Chemistry Into the Unified Forecast System (UFS) for Global Air Quality Applications
He, J., Zhang, L., Schwantes, R. H., Baker, B., Horowitz, L., Naik, V., Lyu, C., Moon, Z., Grell, G., Ahmadov, R., Schnell, J., Yang, K., Wei, Z., Wang, S., Chang, K. L., Gorchov Negron, A. M., Zhu, A., Kondragunta, S., Apel, E. C. & Bourgeois, I. & 10 others, , Mar 2026, In: Journal of Advances in Modeling Earth Systems. 18, 3, e2025MS005299.Research output: Contribution to journal › Article › peer-review
Open Access -
Organic acids and cloud droplet acidity in recent years at Whiteface Mountain, NY, with a focus on wildfire smoke influence
Tripathy, A., Khwaja, H. A., Hussain, M. M., Yerger, E., Kelting, D., Lawrence, C. E., Casson, P., Snyder, P., Lombardo, S., Pittman, N., DeMarle, K., Patel, R., Hammond, L., Apel, E. C., Hornbrook, R. S., Hills, A. J., Brandt, R., McKim, S., Schlemmer, J. & Lance, S., Mar 20 2026, In: Atmospheric Chemistry and Physics. 26, 6, p. 3951-3972 22 p.Research output: Contribution to journal › Article › peer-review
Open Access1 Scopus citations -
Ultrafine Particle Formation and Growth in the Upper Troposphere during the Deep Convective Clouds and Chemistry (DC3) Campaign
Cooke, M. E., Ortega, J., Apel, E. C., Hornbrook, R. S., Mauldin, R. L., Huey, L. G. & Smith, J. N., Apr 10 2026, In: American Chemical Society Environmental Science and Technology Air. 3, 4, p. 943-956 14 p.Research output: Contribution to journal › Article › peer-review
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Analysis of Volatile Organic Compound Product Distributions under Reduced NOxConditions in the NSF NCAR Atmospheric Simulation Chamber: Implications for In Situ VOC Measurements
Asher, E., Hornbrook, R. S., Roozitalab, B., Zhang, X., Ortega, J., Tyndall, G. S., Hills, A. J., Orlando, J. J. & Apel, E. C., Jul 17 2025, In: ACS Earth and Space Chemistry. 9, 7, p. 1737-1751 15 p.Research output: Contribution to journal › Article › peer-review
Prizes
Activities
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The NSF NCAR Trace Organic Gas Analyzer with Time-of-Flight Mass Spectrometer: Calibrations, Uncertainties, and Comparisons
Hornbrook, R. (Speaker)
Dec 9 2025Activity: Give a talk or presentation › Poster
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Shane Marie Visaga
Hornbrook, R. (Host)
Jul 7 2025 → Aug 31 2025Activity: Host a visitor › Hosting an intern/student
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Shuo Chen
Hornbrook, R. (Host)
Jun 16 2025 → Aug 15 2025Activity: Host a visitor › Hosting an intern/student
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Emerging Observational Needs in Atmospheric Chemistry Workshop
Hornbrook, R. (Participant)
Jun 16 2025 → Jun 17 2025Activity: Attend an event › Workshop
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ACOM Summer Tour of ACOM Labs and RAF Facility
Hornbrook, R. (Other Role)
May 20 2025Activity: Internal Service › Tours
Datasets
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Trace Organic Gas Analyzer-Time-of-Flight Mass Spectrometer (TOGA-TOF) Data
Apel, E. (Creator), Hornbrook, R. (Creator) & Hills, A. (Creator), NSF NCAR Earth Observing Lab, Apr 11 2023
Dataset
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Trace Organic Gas Analyzer (TOGA) Data
Apel, E. (Creator), Hornbrook, R. (Creator) & Hills, A. (Creator), NSF NCAR Earth Observing Lab, May 27 2020
Dataset
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TOGA VOC data measured with TOGA-TOF (Trace Organic Gas Analyzer with Time-of-Flight Mass Spectrometer)
Apel, E. (Creator), Hornbrook, R. (Creator) & Hills, A. (Creator), NSF NCAR Earth Observing Lab, Apr 11 2023
Dataset
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AirNow and Low Cost Sensor PM2.5 During Extreme Wildfires in Sonoma County, 2020
Buchholz, R. (Creator) & Hornbrook, R. (Creator), NSF NCAR CISL - Information Sciences Division, Mar 20 2024
DOI: 10.5065/xq6t-v944
Dataset