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Hong Liao

Assistant Scientist  

Department of Environmental Science & Engineering  
Mail Stop 138-78
California Institute of Technology
Pasadena, CA 91125
hong@caltech.edu.

 

 

 

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Ph.D., Environmental Engineering Science, Caltech, 2001
Thesis Title: Interactions between tropospheric chemistry and aerosols in a unified GCM simulation
Advisor: John H. Seinfeld

M.S., Atmospheric Dynamics, Peking University, Beijing, China, 1989
Thesis Title: Numerical simulation of an explosive maritime cyclogenesis
in Asia
Advisor: Shou-Jun Chen

B.S, Meteorology, Peking University, Beijing, China, 1986

 

Research Interests:

 

Tropospheric ozone and aerosols are controlled by a combination of direct and precursor emissions, chemical reactions in the atmosphere, and meteorological processes, each of which has the potential to be affected by climate change with resulting feedbacks. The focus of my research is to investigate the chemistry-aerosol-climate interactions using fully coupled chemistry-aerosol-climate models. My projects are guided by the following objectives:

  • To determine the changes in the abundances of tropospheric ozone and aerosols resulted from the changes in emissions over 2000-2100;
  • To determine the radiative and climate consequences (changes in temperature, precipitation, cloud cover, etc.) of these changes;
  • To investigate the aerosol-chemistry-climate feedbacks that affect the ultimate climate response from changes in tropospheric ozone and aerosols;
  • To determine the effects of future climate change on ozone and aerosol air pollution in polluted regions of the world.



Publications:

 

Chen, W.-T., H. Liao, and J. H. Seinfeld, Future climate impacts of direct radiative forcing of anthropogenic aerosols, tropospheric ozone, and long-lived greenhouse gases, submitted to J. Geophys. Res., 2007.

 

Liao, H, J. Seinfeld, S. Wu, and L. Mickley, Biogenic secondary organic aerosol over the United States: Comparison of climatological simulations with observations, in press, J. Geophys. Res., 2007.

 

van Donkelaar, A., R. V. Martin, R. J. Park, C. L. Heald, T.-M. Fu, H. Liao, and A. Guenther, Model evidence for a significant source of secondary organic aerosol from isoprene, Atmos. Environ., 41, 1267-1274, 2007.

 

Liao, H., W.-T. Chen, and J. H. Seinfeld, Role of climate change in global predictions of future tropospheric ozone and aerosols, J. Geophys. Res., 111, D12304, doi:10.1029/2005JD006852, 2006.

 

Liao, H. and J. H. Seinfeld, Global impacts of gas-phase chemistry-aerosol interactions on direct radiative forcing by anthropogenic aerosols and ozone, J. Geophys. Res., 110, D18208, doi:10.1029/2005JD005907, 2005.

 

Heald, C. L., D. J. Jacob, R. J. Park, L. M. Russell, B. J. Huebert, J. H. Seinfeld, H. Liao, and R. J. Weber, A large organic aerosol source in the free troposphere missing from current models, Geophys. Res. Lett., 32, L18809, doi:10.1029/2005GL023831, 2005.

 

Liao, H., J. H. Seinfeld, P. J. Adams, and L. J. Mickley, Global radiative forcing of coupled tropospheric ozone and aerosols in a unified general circulation model, J. Geophys. Res., 109, D16207, doi:10.1029/2003JD004456, 2004.

 

Liao, H., P. J. Adams, S. H. Chung, J. H. Seinfeld, L. J. Mickley, and D. J. Jacob, Interactions between tropospheric chemistry and aerosols in a unified general circulation model. J. Geophys. Res., 108(D1), 4001, doi:10.1029/2001JD001260, 2003.

 

Collins, D. R., H. H. Jonsson, H. Liao, R. C. Flagan, J. H. Seinfeld, K. J. Noone, and S. V. Hering, Airborne analysis of the Los Angeles aerosol, Atmos. Environ., 34, 4155-4173, 2000.

 

Liao, H., Y. L. Yung, and J. H. Seinfeld, Effects of aerosols on tropospheric photolysis rates in clear and cloudy atmospheres, J. Geophys. Res., 104, 23697-23707, 1999.

 

Liao, H. and J. H. Seinfeld, Radiative forcing by mineral dust aerosols: sensitivity to key variables, J. Geophys. Res., 103, 31637- 31645, 1998.

 

Liao, H. and J. H. Seinfeld, Effect of clouds on direct aerosol radiative forcing of climate, J. Geophys. Res., 103, 3781-3788, 1998.

 

Yung, Y. L., Y. Jiang, H. Liao, and M. F. Gerstell, Enhanced UV penetration due to ozone cross-section changes induced by CO2 doubling, Geophys. Res. Lett., 24, 3229-3231, 1997.