Tsai, I-Chun蔡宜君

Assistant Research Fellow

Research Interests

Aerosol parameterization and modeling, Aerosol-cloud interactions, Climate-Chemistry interactions, Cloud Physics, Atmospheric Physical Chemistry


Representative Publications

Chen, Y.-C., P.-H. Lin, W.-N. Chen, I-C. Tsai, S. Laplace, C.-C. Ting, C. Fu, Charles, C.-K. Chou, 2022: Decade long-term measurement for investigating vertical thermodynamic of urban boundary layer, Urban Climate, 46, 2022, 101301,https://doi.org/10.1016/j.uclim.2022.101301. 

Tsai, I-C., L.-S. Shu, J.-P. Chen, P.-R. Hsieh, and C.-T. Cheng, 2022: Projecting ozone impact on crop yield in Taiwan under climate warming. Science of the Total Environment, 846(2022), 157437, https://doi.org/10.1016/j.scitotenv.2022.157437.

Tsai, I-C.*, P.-R. Hsieh, C.-T. Cheng, Y.-S. Tung, L.-Y. Lin and H.-H. Hsu, 2022. Impacts of 2 and 4 °C global warmings on extreme temperatures in Taiwan, Accepted by International Journal of Climatology, . https://doi.org/10.1002/joc.7815.

S.-Y. Lee, S.-C. C. Lung, P.-G. Chiu, W.-C. Wang, I-C. Tsai, T.-H. Lin, 2022: Northern hemisphere urban heat stress and associated labor hour hazard from ERA5 reanalysis. Int. J. Environ. Res. Public Health. 2022, 19, 8163. https://doi.org/10.3390/ijerph19138163

Tsai, I-C.*, P.-R. Hsieh, H. C. Cheung, and C. C.-K. Chou, 2021: Aerosol impacts on fog microphysics over the western side of Taiwan Strait in April from 2015 to 2017, Atmospheric Environment, 118523,

Tsai, I-C.*, C.-Y. Lee, S.-C. C. Lung, C.-W. Su, 2021: Characterization of the vehicle emissions in the Greater Taipei Area through vision-based traffic analysis system and its impacts on urban air quality, Science of the Total Environment, 782(2021), 146571, ISSN 0048-9697.

Lee, W.-L., Y.-C. Wang, C.-J. Shiu, I-C. Tsai, C.-Y. Tu, Y.-Y. Lan, J.-P. Chen, H.-L. Pan, and H.-H. Hsu, 2020: Taiwan Earth System Model Version 1: description and evaluation of mean state, Geosci. Model Dev., 13, 3887–3904.

Zhang, L., T.-M. Fu, H. Tian, Y. Ma, J.-P. Chen, T.-C. Tsai, I-C. Tsai, Z. Meng, X. Yang. 2020: Anthropogenic Aerosols Significantly Reduce Mesoscale Convective System Occurrences and Precipitation over Southern China in April, Geophysical Research Letters. 47, e2019GL086204.

Wu, C.-H., I-C. Tsai, P.-C. Tsai and Y.-S. Tung, 2019: Large-Scale Seasonal Control of Air Quality in Taiwan, Atmospheric Environment, 214, 116868.

Huang C.-C., S.-H. Chen, Y.-C. Lin, K. Earl, T. Matsui, H.-H. Lee, I-C. Tsai, J.-P. Chen, C.-T. Cheng, 2019: Impacts of Dust-Radiation versus Dust-Cloud Interactions on the Development of a Modeled Mesoscale Convective System over North Africa.  Monthly Weather Review, 147, 3301–3326.

Tsai, I-C.*, W.-Y. Chen, J.-P. Chen, and M.-C. Liang, 2019: Kinetic mass-transfer calculation of water isotope fractionation due to cloud microphysics in a regional meteorological model, Atmos. Chem. Phys., 19, 1753-1766.

Lung, S.-C., S.-W. Chou, J.-P. Chen, P.-C. Wen, H.-J. J. Su, I-C. Tsai, and Y.-S. Shen, 2018: Science Plan of “Climate Change and Health Adaptation”, Journal of Taiwan Land Research, 21, 2, 209-239 (in Chinese).

Tsai, I-C.*, W.-C. Wang, H.-H. Hsu, and W.-L. Lee, 2016: Aerosol effects on summer monsoon over Asia during 1980s and 1990s, J. Geophys. Res. Atmos., 121, 1176111776,.

Chen, J.-P*, I-J. Chen and I-C. Tsai, 2016: Dynamic feedback of aerosol effect on the East Asian summer monsoon. Journal of Climate, 29(17):6137-6149.

Li, N., J.-P. Chen, I-C. Tsai, Q. He, S.-Y. Chi, Y.-C. Lin, and T.-M. Fu, 2016: Potential impacts of electric vehicles on air quality in Taiwan.  Science of the Total Environment, 566-567(2016), 919-928.

Tsai, I-C., J.-P. Chen*, C. S.-C. Lung, N. Li, W.-N. Chen, T.-M. Fu, C.-C. Chang, and G.-D. Hwang, 2015: Sources and formation pathways of organic aerosol in a subtropical metropolis during summer.  Atmospheric Environment, 117, 51-60.

Tsai, I-C., J.-P. Chen, Y.-C. Lin, C C.-K. Chou, and W.-N. Chen, 2015: Numerical investigation of the coagulation mixing between dust and hygroscopic aerosol particles and its impacts. Journal of Geophysical Research: Atmospheres, 120, 9, 4313-4233, doi:10.1002/2014JD022899.

Chen, J.-P.*, C.-E. Yang and I-C. Tsai, 2015: Estimation of foreign versus domestic contributions to Taiwan's air pollution. Atmospheric Environment, 112,9-19, doi:10.1016/j.atmosenv.2015.02.022.

Lin, Y.-C., J.-P. Chen*, T.-Y. Ho and I-C. Tsai, 2015: Atmospheric Iron deposition in the Northwestern Pacific Ocean and its Adjacent Marginal Seas: the Importance of Coal Burning. Global Biogeochemical Cycles, 29139159, doi:10.1002/2013GB004795.




  • Aerosol-Cloud Interactions
    • Concerning aerosols in Taiwan, I have published papers indicating that (i) biogenic sources and aqueous-phase processes dominated organic aerosol production in northern Taiwan; (ii) the mixing process between sulfate and dust particles can reduce the overall single scattering albedo by up to 10% during a dust event; and (iii) urban aerosols may affect the microphysical properties of fog droplets over the Taiwan Strait in April.
    • I improved the transportation emissions inventories covering the Greater Taipei Area by incorporating web-based traffic information and implementing a vision-based traffic analysis system. The simulation results indicated that the addition of real-time traffic data improved the air quality model’s performance, especially for CO and PM2.5 concentrations.
    • In collaboration with National Taiwan University, I performed kinetic calculations of isotope fractionation due to various microphysical phase-change processes in clouds into a regional model. Different factors controlling isotopic composition, including water vapor sources, atmospheric transport, phase transition pathways of water in clouds, and kinetic versus equilibrium mass transfer, contributed significantly to variations in isotope composition. This work advanced our understanding of the stable isotopocules of water, informing the understanding of the water cycle.
    • I employed the homemade aerosol parameterization scheme in the Taiwan Earth System Model (TaiESM) to increase Taiwan’s climate modeling capability and capacity. After verification through reanalysis data and observations, TaiESM can comprehensively reproduce a robust climatological state and near-surface aerosol concentrations. Most large-scale circulations and precipitation were accurately simulated in the historical simlation, and TaiESM is now registered as one of the models in the sixth phase of the Coupled Model Intercomparison Project.
  • Aerosol Effects on Climate:
    • The effect of aerosols on summer and winter Asian monsoons were investigated by improving and conducting earth system model simulations. Anthropogenic aerosols were shown to (i) weaken East Asia’s summer monsoon due mainly to the southward shift of the 200 hPa East Asia Jet and the decrease in 850 hPa winds; (ii) weaken and strengthen the intensity of the Aleutian Low and the Siberian High, respectively, resulting in a weakened East Asia Winter Monsoon (EAWM) in the lower atmosphere over the extratropical areas. The tropical rain belt shifts southward for the southern area, representing the Hadley circulation change, and the precipitation is decreased in southern Asia.
  • Risk of Climate Change in Taiwan
    • By conducting high-resolution simulations, I estimated the effect of climate change on Taiwan under 2 °C and 4 °C warming climate. We indicated (i) the number of heatwaves over urban areas increased more quickly than over other land-use types, and forests were less vulnerable to global warming; (ii) the warming climate worsens the polluted days in Taiwan due to weaker near-surface wind; and (iii) the warming climate reduced the relative yield for wheat, tomatoes, and potatoes. The O3-induced relative yield reduction dominated the additional yield reduction for a 2 °C warming climate, but climate-induced relative yield prevailed under 4 °C warming.
  • Ph.D.
    Depart. of Atmospheric Sciences
    National Taiwan University, Taiwan (2009)
  • M.S.
    Depart. of Atmospheric Sciences
    National Taiwan University, Taiwan (2001)
  • B.S.
    Depart. of Earth Sciences
    National Taiwan Normal University, Taiwan (1997)
  • (02) 2787-5935

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