Li Xu
Assistant Project Scientist, Department of Earth System Science
Biography
Li Xu, Ph.D., is Assistant Project Scientist in the Department of Earth System Science at the University of California, Irvine. A climate scientist specializing in aerosol-chemistry-climate interactions, Xu has focused his research on understanding the impacts of wildfire emissions, sea salt aerosols, and atmospheric chemistry on global and regional climate systems using advanced Earth system models including the Department of Energy's E3SM and NCAR's CESM.
Xu received his Ph.D. in Atmospheric and Space Science from the University of Michigan, Ann Arbor in 2012, where he also earned an M.A. in Statistics in 2010 and an M.S. in Atmospheric Science in 2006. He completed his undergraduate studies with a B.S. in Atmospheric Science from Sun Yat-Sen University in Guangzhou, China in 2001. Prior to his current position, Xu served as a Postdoctoral Research Associate at Scripps Institution of Oceanography from 2012 to 2015, where he developed parameterizations for sea salt aerosol production from frost flowers and studied their climate impacts in the Arctic.
Xu has authored over 25 peer-reviewed publications in leading atmospheric science journals and has presented his research at numerous international conferences including the American Geophysical Union Fall meetings and E3SM Principal Investigator meetings. He serves as a reviewer for multiple journals including Nature Communications, Journal of Geophysical Research-Atmosphere, and Atmospheric Chemistry and Physics. His current research involves developing machine learning surrogate models for wildfire activities, managing multi-decade emission datasets, and coordinating annual progress reports for the DOE's Biological and Environmental Research program.
Return to topEducation
- Ph.D. in Atmospheric and Space Science, University of Michigan, 2012
- M.A. in Statistics, University of Michigan, 2010
- M.S. in Atmospheric Science, University of Michigan, 2006
- B.S. in Atmospheric Science, Sun Yat-Sen University, 2001
Areas of Expertise
- Atmospheric Chemistry Climate Modeling
- Aerosol Radiative Effects
- Wildfire Emission Impacts
- Sea Salt Aerosol Parameterization
- ENSO Surface Ozone Variability
- Machine Learning Fire Modeling
- Earth System Model Development
- Frost Flower Aerosol Sources
- Deforestation Fire Atmospheric Composition
Recent Publications
- Li, F., Zhu, Q., Riley, W. J., Zhao, L., Xu, L., Yuan, K., Chen, M., Wu, H., Gui, Z., Gong, J., Randerson, J. T., “AttentionFire_v1.0: interpretable machine learning fire model for burned-area predictions over tropics” (opens in new tab), Geoscientific Model Development, vol. 16, pp. 869–884, 2023.
- Zhu, Q., Li, F., Riley, W. J., Xu, L., Zhao, L., Yuan, K., Wu, H., Gong, J., Randerson, J., “Building a machine learning surrogate model for wildfire activities within a global Earth system model” (opens in new tab), Geoscientific Model Development, vol. 15, pp. 1899–1911, 2022.
- Xu, L., Zhu, Q., Riley, W. J., Chen, Y., Wang, H., Ma, P., Randerson, J. T., “The influence of fire aerosols on surface climate and gross primary production in the Energy Exascale Earth System Model (E3SM)” (opens in new tab), Journal of Climate, vol. 34, no. 17, pp. 7219-7238, 2021.
- Xu, L., Yu, J-Y., “An ENSO-induced aerosol dipole in the west-central Pacific and its potential feedback to ENSO evolution” (opens in new tab), Climate Dynamics, vol. 52, pp. 5115-5125, 2018.
- Zhu, J, Penner, JE, Lin, G, Zhou, C, Xu, L, Zhuang, B, “Mechanism of SOA formation determines magnitude of radiative effects” (opens in new tab), Proceedings of the National Academy of Sciences of the United States of America, vol. 114, pp. 12685-12690, 2017.
- Xu L., Yu, J-Y., Schnell, J. L., Prather, M. J., “The seasonality and geographic dependence of ENSO impacts on US surface ozone variability” (opens in new tab), Geophysical Research Letters, vol. 44, pp. 3420-3428, 2017.
- Yang, Y., Russell, L.M., Xu, L., Lou, S., Lamjiri, M.A., Somerville, R.C.J., Milller, A. J., Cayan, D.R., DeFlorio, M.J., Ghan, S.J., Liu, Y., Singh, B., Wang, H., Yoon, J-H., Rasch, P.J., “Impacts of ENSO events on cloud radiative effects in preindustrial conditions: Changes in cloud fraction and their dependence on interactive aerosol emissions and concentrations” (opens in new tab), Journal of Geophysical Research, vol. 121, pp. 6321–6335, 2016.
- Metzger, S., Steil, B., Abdelkader, M., Klingmüller, K., Xu, L., Penner, J. E., Fountoukis, C., Nenes, A., Lelieveld, J., “Aerosol water parameterisation: a single parameter framework” (opens in new tab), Atmospheric Chemistry and Physics, vol. 16, pp. 7213-7237, 2016.
- Xu, L., Russell, L.M., Burrows, S.M., “Potential sea salt aerosol sources from frost flowers in the pan-Arctic region” (opens in new tab), Journal of Geophysical Research, vol. 121, pp. 10,840–10,856, 2016.
- Lou, S., Russell, L.M., Yang, Y., Xu, L., Lamjiri, M.A., DeFlorio, M.J., Milller, A. J., Ghan, S.J., Liu, Y., Singh, B., Yoon, J-H., Rasch, P.J., “Impacts of the East Asian Monsoon on springtime dust concentrations over China” (opens in new tab), Journal of Geophysical Research, vol. 121, pp. 8137–8152, 2016.
- Xu, L., Cameron-Smith, P., Russell, L. M., Ghan, S. J., Liu, Y., Elliott, S., Yang, Y., Lou, S., Lamjiri, M. A., Manizza, M., “DMS role in the ENSO cycle in the Tropics” (opens in new tab), Journal of Geophysical Research Atmospheres, vol. 121, pp. 537-558, 2016.
- Li Xu, Philip Cameron-Smith, Lynn M. Russell, Steven J. Ghan, Ying Liu, Scott Elliott, Yang Yang, Sijia Lou, Maryam A. Lamjiri, Manfredi Manizza, “DMS role in ENSO cycle in the tropics” (opens in new tab), Journal of Geophysical Research, vol. 121, pp. 13-558, 2016.
- Xu L., D. W. Pierce, L. M. Russell, A. J. Miller, R. C. J. Somerville, C. H. Twohy, S. J. Ghan, B. Singh, J. H. Yoon, P. J. Rasch, “Interannual to decadal variability of sea salt aerosols in the coupled climate model CESM1.0” (opens in new tab), Journal of Geophysical Research, vol. 120, pp. 1502-1519, 2015.
- Lin, G., J. E. Penner, M. G. Flanner, S. Sillman, L. Xu, C. Zhou, “Radiative forcing of organic aerosol in the atmosphere and on snow: Effects of SOA and brown carbon” (opens in new tab), Journal of Geophysical Research, vol. 119, pp. 7453–7476, 2014.
- Ito, A., Xu, L., “Response of acid mobilization of iron-containing mineral dust to improvement of air quality projected in the future” (opens in new tab), Atmospheric Chemistry and Physics, vol. 14, pp. 3441-3459, 2014.
- Myhre, G., Samset, B. H., Schulz, M., Balkanski, Y., Bauer, S., Berntsen, T. K., Bian, H., Bellouin, N., Chin, M., Diehl, T., Easter, R. C., Feichter, J., Ghan, S. J., Hauglustaine, D., Iversen, T., Kinne, S., Kirkevåg, A., Lamarque, J.-F., Lin, G., Liu, X., et al., “Radiative forcing of the direct aerosol effect from AeroCom Phase II simulations” (opens in new tab), Atmospheric Chemistry and Physics, vol. 13, pp. 1853-1877, 2013.
- Xu, L., L. M. Russell, R. C. J. Somerville, P. K. Quinn, “Frost flower aerosol effects on Arctic wintertime longwave cloud radiative forcing” (opens in new tab), Journal of Geophysical Research Atmospheres, vol. 118, pp. 13,282–13,291, 2013.
- Xu, L., Penner, J. E., “Global simulations of nitrate and ammonium aerosols and their radiative effects” (opens in new tab), Atmospheric Chemistry and Physics, vol. 12, pp. 9479-9504, 2012.
- Joyce E. Penner, Cheng Zhou, Li Xu, “Consistent estimates from satellites and models for the first aerosol indirect forcing” (opens in new tab), Geophysical Research Letters, vol. 39, 2012.
- Metzger, S., Steil, B., Xu, L., Penner, J. E., Lelieveld, J., “New representation of water activity based on a single solute specific constant to parameterize the hygroscopic growth of aerosols in atmospheric models” (opens in new tab), Atmospheric Chemistry and Physics, vol. 12, pp. 5429-5446, 2012.
Most Cited Publications
- Penner, J.E., L. Xu, M. Wang, “Satellite methods underestimate indirect climate forcing by aerosols” (opens in new tab), Proceedings of the National Academy of Sciences of the United States of America, vol. 108, pp. 13404–13408, 2011.
- Penner, J.E., C. Zhou, L. Xu, M. Wang, “Reply to Quaas et al.: Can satellites be used to estimate indirect climate forcing by aerosols?” (opens in new tab), Proceedings of the National Academy of Sciences of the United States of America, vol. 108, pp. E1100-E1101, 2011.
This profile was created with the help of AI.
Last updated on 7/28/2025.