Full CV (last updated Jan 2019)

I will be starting a position as an assistant professor in the School of Earth and Atmospheric Sciences at Georgia Tech in April, 2020. Contact me to inquire potential opportunities for graduate students and postdoc.


Research Interests

I am currently a postdoc researcher working with Dr. Loretta Mickley in the Atmospheric Chemistry Modeling Group at Harvard. My current project focuses on the interactions between aerosols and climate across multiple timescales in the past. I use the chemical transport model GEOS-Chem, combined with ice core data of black carbon and other proxies to study the history of wildfire activities. 

I was an experimentalist prior to joining the modeling group. I completed my Ph.D. dissertation with Dr. Scot Martin at Harvard in 2017. My dissertation work was in part supported by the NASA Earth and Space Science Fellowship. My PhD research centered on the physical, optical, and thermodynamic properties of organic particulate matter, and their influences on Earth's climate and atmospheric chemistry. I developed a spectroscopic method to measure the wavelength-dependent complex refractive indices of secondary organic material. I also developed new experimental approaches to investigate the volatility, condensed-phase diffusivities, and hygroscopicity of organic particulate matter. Before arriving at Harvard, I earned BS and MS degrees in Atmospheric Sciences, both from Peking University. I worked on the "Haze in China"  field campaign during my study of the master's degree. My master thesis was on the hygroscopicity, optical properties, and vertical distributions of the haze particles over the North China Plain.   



2011-2017 Ph.D. in Environmental Science & Engineering Harvard University
2008-2011 M.S. in Atmospheric Physics & Environment Peking University
2004-2008  B.S. in Atmospheric Sciences Peking University 

Awards and Honors

2018           Award in Natural Sciences (2nd class), Ministry of Education of P. R. China (for the project "Haze in China").

2017           Chinese Government Award for Outstanding Self-financed Student Abroad 

2017           Participant of ACCESS XIV (Atmospheric Chemistry Colloquium for Emerging Senior Scientists), Brookhaven National Laboratory, NY

2013-2016  NASA Earth and Space Science Fellowship (NESSF)

2010           Outstanding Award in National Competition of Innovative Experiments, Ministry of Education, China

2007           Hsieh Yi-Ping Award for Young Scientists in Meteorological Science and Technology, Peking University

2006-2007  Presidential Undergraduate Research Fellowship, Peking University

2003           1st Prize in Chinese Physics Olympiad (CPhO) in Henan District, Chinese Physical Society

Publications (by research topics)

Phase States, Viscosity, and Reactivity of Organic Particulate Matter

Liu, P. F., Li, Y. J., Wang, Y., Bateman, A. P., Zhang, Y., Gong, Z. H., Bertram, A. K., Martin, S. T.: Highly viscous states affect the browning of atmospheric organic particulate matter, ACS Central Science, 4(2), 207–215, 2018.

Liu, P., Li, Y. J., Wang, Y., Gilles, M. K., Zaveri, R. A., Bertram, A. K., and Martin, S. T.: Lability of secondary organic particulate matter, Proc. Natl. Acad. Sci. U.S.A., 113(45), 12643-12648, 2016.

Bateman, A. P., Gong, Z., Liu, P., Sato, B., Cirino, G., Zhang, Y., Artaxo, P., Bertram, A. K., Manzi, A. O., Rizzo, L. V., Souza, R. A. F., Zaveri, R. A., and Martin, S. T.: Sub-micrometre particulate matter is primarily in liquid form over Amazon rainforest, Nature Geosci, 9, 34-37, 2016.

Song, M.; Liu, P. F.; Hanna, S. J.; Zaveri, R. A.; Potter, K.; You, Y.; Martin, S. T.; Bertram, A. K., Relative humidity-dependent viscosity of secondary organic material from toluene photo-oxidation and possible implications for organic particulate matter over megacities.  Atmos. Chem. Phys., 2016, 16, 8817-8830.

Li, Y. J.; Liu, P. F.; Gong, Z.; Wang, Y.; Bateman, A. P.; Bergoend, C.; Martin, S. T., Chemical reactivity and liquid/non-liquid states of secondary organic material. Environ. Sci. Technol. 2015, 49(22), 13264-13274.

Li, Y. J.; Liu, P. F.; Bergoend, C.; Bateman, A. P.; Martin, S. T., Rebounding hygroscopic inorganic aerosol particles: liquids, gels, and hydrates. Aerosol Sci. Tech., 2017, 51(3), 388-396.

Song, M.; Liu, P. F.; Hanna, S. J.; Li, Y. J.; Martin, S. T.; Bertram, A. K., Relative humidity-dependent viscosities of isoprene-derived secondary organic material and atmospheric implications for isoprene-dominant forests. Atmos. Chem. Phys. 2015, 15, (9), 5145-5159.

Zhang, Y.; Sanchez, M. S.; Douet, C.; Wang, Y.; Bateman, A. P.; Gong, Z.; Kuwata, M.; Renbaum-Wolff, L.; Sato, B. B.; Liu, P. F.; Bertram, A. K.; Geiger, F. M.; Martin, S. T., Changing shapes and implied viscosities of suspended submicron particles. Atmos. Chem. Phys. 2015, 15, (14), 7819-7829.

Shrestha, M.; Zhang, Y.; Upshur, M. A.; Liu, P. F.; Blair, S. L.; Wang, H.-F.; Nizkorodov, S. A.; Thomson, R. J.; Martin, S. T.; Geiger, F. M., On surface order and disorder of α-pinene-derived secondary organic material. J. Phys. Chem. A, 2015, 119, (19), 4609-4617.

Optical Properties of Organic Particulate Matter

Liu, P. F., Abdelmalki, N., Hung, H. M., Wang, Y., Brune, W. H., and Martin, S. T.: Ultraviolet and visible complex refractive indices of secondary organic material produced by photooxidation of the aromatic compounds toluene and m-xylene, Atmos. Chem. Phys., 15, 1435-1446, 2015.

Liu, P., Zhang, Y., and Martin, S. T.: Complex refractive indices of thin films of secondary organic materials by spectroscopic ellipsometry from 220 to 1200 nm, Environ. Sci. Technol., 47, 13594-13601, 2013.

Hygroscopicity, Cloud Condensation Nuclei Activity, and Phase Separation

Liu, P. F., Song, M., Zhao, T. N., Gunthe, S. S., Ham, S., He, Y. P., Qin, Y. M., Gong, Z. H., Amorim, J. C., Bertram, A. K., Martin, S. T.: Resolving the Mechanisms of Hygroscopic Growth and Cloud Condensation Nuclei Activity for Organic Particulate Matter, Nature Communications, 2018, accepted.

Gray Be, A.; Upshur, M. A.; Liu, P. F.; Martin S. T.; Geiger, F; Thomson, R., Cloud activation potentials for atmospheric α-pinene and β-caryophyllene ozonolysis products. ACS Central Science, 2017, 3(7), 715-725.

Song, M., Liu, P. F., Martin, S. T., and Bertram, A. K.: Liquid-liquid phase separation in particles containing secondary organic material free of inorganic salts, Atmos. Chem. Phys., 2017, 17, 11261-11271.

Rastak, N., Pajunoja, A., Acosta Navarro, J. C., Ma, J., Song, M., Partridge, D. G., Kirkevåg, A., Leong, Y., Hu, W. W., Taylor, N. F., Lambe, A., Cerully, K., Bougiatioti, A., Liu, P., Krejci, R., Petäjä, T., Percival, C., Davidovits, P., Worsnop, D. R., Ekman, A. M. L., Nenes, A., Martin, S., Jimenez, J. L., Collins, D. R., Topping, D. O., Bertram, A. K., Zuend, A., Virtanen, A., and Riipinen, I.: Microphysical explanation of the RH-dependent water affinity of biogenic organic aerosol and its importance for climate, Geophys. Res. Lett., 2017, 10.1002/2017GL073056.

Renbaum-Wolff, L.; Song, M.; Marcolli, C.; Zhang, Y.; Liu, P. F.; Grayson, J. W.; Geiger, F. M.; Martin, S. T.; Bertram, A. K., Observations and implications of liquid–liquid phase separation at high relative humidities in secondary organic material produced by α-pinene ozonolysis without inorganic salts. Atmos. Chem. Phys., 2016, 16, 7969-7979.

Environment and Human Health

*Shi, L. H., *Liu, P. F.; Kloog, I; Lee, M; Kosheleva, A; Schwartz, J. D., Estimating daily air temperature across the Southeastern USA using high-resolution satellite data: A statistical modeling study. Environ. Res. 2016, 146, 51-58. (*contributed equally)

Shi, L., Kloog, I., Zanobetti, A., Liu, P., and Schwartz, J. D.: Impacts of temperature and its variability on mortality in New England, Nature Climate Change, 5, 988-991, 2015.

Shi, L. H.; Liu, P. F.; Zanebetti, A; Kosheleva, A; Schwartz, J. D., Chronic effects of temperature on mortality in the Southeastern USA using satellite-based exposure metrics. 2016, Scientific Reports, 2016, 6, 30161.

Wang, Y.; Lee, M; Liu, P. F.; Shi, L. H.; Yu, Z.; Awad, Y. A.; Zanobetti, A; Schwartz, J. D., Doubly robust additive hazards models to estimate effects of a continuous exposure on survival. Epidemiology, 2017 28(6), 771-779.

Wang, Y.; Shi, L. H.; Lee, M; Liu, P. F.; Di, Q.; Zanobetti, A; Schwartz, J. D., Long-term exposure to PM2.5 and mortality among older adults in the Southeastern US. Epidemiology, 2017, 28(2), 207-214.

Haze in China

Liu, P. F., Zhao, C. S., Göbel, T., Hallbauer, E., Nowak, A., Ran, L., Xu, W. Y., Deng, Z. Z., Ma, N., Mildenberger, K., Henning, S., Stratmann, F., and Wiedensohler, A.: Hygroscopic properties of aerosol particles at high relative humidity and their diurnal variations in the North China Plain, Atmos. Chem. Phys., 11, 3479-3494, 2011.

Liu, P., Zhao, C., Zhang, Q., Deng, Z., Huang, M., Ma, X., and Tie, X.: Aircraft study of aerosol vertical distributions over Beijing and their optical properties, Tellus B, 61, 756-767, 2009.

Tao, J. C.; Zhao, C. S.; Ma, N.; Liu, P. F., The impact of aerosol hygroscopic growth on the single-scattering albedo and its application on the NORR2RR photolysis rate coefficient. Atmos. Chem. Phys. 2014, 14, (22), 12055-12067.

Xu, W. Y.; Zhao, C. S.; Ran, L.; Deng, Z. Z.; Ma, N.; Liu, P. F.; Lin, W. L.; Yan, P.; Xu, X. B., A new approach to estimate pollutant emissions based on trajectory modeling and its application in the North China Plain. Atmos. Environ. 2013, 71, (0), 75-83.

Wang, J.; Mao, J.; Zhao, C.; Yan, P.; Ma, N.; Liu, P. F.; Liu, X., A novel four-wavelength transmissometer for distinguishing haze and fog. Acta Meteorologica Sinica 2013, 27, (4), 556-565.

Chen, J.; Zhao, C. S.; Ma, N.; Liu, P. F.; Göbel, T.; Hallbauer, E.; Deng, Z. Z.; Ran, L.; Xu, W. Y.; Liang, Z.; Liu, H. J.; Yan, P.; Zhou, X. J.; Wiedensohler, A., A parameterization of low visibilities for hazy days in the North China Plain. Atmos. Chem. Phys. 2012, 12, (11), 4935-4950.

Ma, N.; Zhao, C. S.; Müller, T.; Cheng, Y. F.; Liu, P. F.; Deng, Z. Z.; Xu, W. Y.; Ran, L.; Nekat, B.; van Pinxteren, D.; Gnauk, T.; Müller, K.; Herrmann, H.; Yan, P.; Zhou, X. J.; Wiedensohler, A., A new method to determine the mixing state of light absorbing carbonaceous using the measured aerosol optical properties and number size distributions. Atmos. Chem. Phys. 2012, 12, (5), 2381-2397.

Ma, N.; Zhao, C. S.; Nowak, A.; Müller, T.; Pfeifer, S.; Cheng, Y. F.; Deng, Z. Z.; Liu, P. F.; Xu, W. Y.; Ran, L.; Yan, P.; Göbel, T.; Hallbauer, E.; Mildenberger, K.; Henning, S.; Yu, J.; Chen, L. L.; Zhou, X. J.; Stratmann, F.; Wiedensohler, A., Aerosol optical properties in the North China Plain during HaChi campaign: an in-situ optical closure study. Atmos. Chem. Phys. 2011, 11, (12), 5959-5973.

Ran, L.; Zhao, C. S.; Xu, W. Y.; Lu, X. Q.; Han, M.; Lin, W. L.; Yan, P.; Xu, X. B.; Deng, Z. Z.; Ma, N.; Liu, P. F.; Yu, J.; Liang, W. D.; Chen, L. L., VOC reactivity and its effect on ozone production during the HaChi summer campaign. Atmos. Chem. Phys. 2011, 11, (10), 4657-4667.

Xu, W. Y.; Zhao, C. S.; Ran, L.; Deng, Z. Z.; Liu, P. F.; Ma, N.; Lin, W. L.; Xu, X. B.; Yan, P.; He, X.; Yu, J.; Liang, W. D.; Chen, L. L., Characteristics of pollutants and their correlation to meteorological conditions at a suburban site in the North China Plain. Atmos. Chem. Phys. 2011, 11, (9), 4353-4369.

Deng, Z. Z.; Zhao, C. S.; Ma, N.; Liu, P. F.; Ran, L.; Xu, W. Y.; Chen, J.; Liang, Z.; Liang, S.; Huang, M. Y.; Ma, X. C.; Zhang, Q.; Quan, J. N.; Yan, P.; Henning, S.; Mildenberger, K.; Sommerhage, E.; Schäfer, M.; Stratmann, F.; Wiedensohler, A., Size-resolved and bulk activation properties of aerosols in the North China Plain. Atmos. Chem. Phys. 2011, 11, (8), 3835-3846.

Xiao, X. Z.; Liu, P. F.; Geng, F. H.; Gao, W.; Zhen, C. M.; Zhao, C. S., Comparison of black carbon aerosols in urban and suburban areas of Shanghai. J. App. Meteorol. Sci. 2011, 22, (2), 158-168 (in Chinese).

Land-Air Energy Exchange

Liu, P. F.; Liu, S. H.; Hu, F.; Lv, S.; Liu, H.; Zhang, Y.; Chen, G.; Liang, F., A comparison of the different methods for estimating turbulent fluxes and their errors. Acta Meteorologica Sinica 2010, 68, (4), 487-500 (in Chinese).