Welcome to Prof. Daeok Daniel Youn's Homepage!!

His research is briefly summarized below.

Research Area

1. Earth System Modeling (Global Climate and Chemistry Modeling):

- Currently working with an aersol-chemistry module as part of United Kingdom Chemistry and Aerosol (UKCA) included in the HadGEM,  a configuration of the UK Met Office Unified Model (UM).

- Developed a linking tool (one-way coupled global Climate-Chemistry model) between the “Harvard GEOS-Chem” chemistry and transport model and “NCAR CCSM-3” a climate model

- Developed the UIUC 2.5-D chemical-radiative-transport model and the UIUC radiative-transfer model

- Evaluated and inter-compared state-of-the-art global Chemistry and Transport Models (CTMs), “NCAR MOZART families” and “NASA GEOS-Combo”, relative to observational datasets

- Assessing past and future environmental changes in ozone and PMs related to climate changes (using a global Climate-Chemistry model and a regional WRF-Chem model)

2. Sciences on Atmospheric Chemical and Aerosol Environment:

- Investigate atmospheric lifetimes and impacts of replacement compounds on ozone (pursuant to Article 6 of the Montreal Protocol) through the numerical calculation of Ozone Depletion Potentials (ODPs)

- Investigate direct and indirect effects of replacement compounds on ozone and climate through the numerical calculations of Radiative Forcings and Global Warming Potentials (GWPs)

- Study the long-term variability of stratospheric tracers associated with wave activities and residual circulation

- Investigate the interaction of atmospheric dynamical processes with atmospheric chemistry

- Perform extensive spatio-temporal analyses of O3(ozone) and PM-2.5 data analysis

- Study and apply the thermodynamics of gas-to-particle conversion to form PM-2.5 over the East Asia

3. Environmental assessment modeling in outdoor air:

- Assess environmental impacts of new sources such as power plants and industrial complexes using atmospheric dispersion models (AERMOD and CALPUFF)

- Assess radionuclides (Krypton-85 and radio-xenon) transport to discreminate clandestine source of plutonium seperation. Xenon isotopes will be assessed soon

Professional Employment (Appointments)

April 2022 - Current, Full professor,

Department of Earth Science Education, Chungbuk National University

September 2018 - 2000, Vice Dean, College of Education, Chungbuk National University

September2012 – March 2022, Assistant Professor, Associate Professor

Department of Earth Science Education, Chungbuk National University

October 2010 – August 2012,

Principal Researcher/Research Fellow at Environment Appraisal Division

Adjunct Researcher at National Climate Change Center

Korea Environment Institute (KEI)

March 2010 – September 2010,

Research Resident (Post-Doctoral position)

Global Environment Center, Korea Institute of Science and Technology (KIST)

March 2008 - February 2010,

Senior Research Scientist

Research Institute of Basic Sciences, Seoul National University

March 2005 - March 2009,

Visiting Research Scholar (Post-Doc.)

Research Scientist (since August 2006)

Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign

November 2001 – November 2002,

Visiting Research Scholar

Department of Atmospheric Sciences, Seoul National University

1999, University Staff (Temporary government position)

2004, University Staff (Temporary government position)

1995-1998 & 2000-2003, Research Assistant

1995-1998, Teaching Assistant

Publications

39. Park, Sungsu, Chanwoo Song, and Daeok Youn, 2022: Relationship between Low-level Clouds and Large-scale Environmental Conditions around the Globe, Korean Earth Sci. Soc., 43(6), 711-736. http://jkess.org/journal/article.php?code=85532 (English)

38. Youn, Daeok, Hyunggyu Song, and Sungsu Park, 2022: An Installation and Model Assessment of the UM, U.K. Earth System Model, in a Linux Cluster, Korean Earth Sci. Soc., 43(6), 609-711. http://jkess.org/journal/article.php?code=85531 (Korean with English abstract)

37. Daeok Youn, Hyunggyu Song, and Johan Lee, 2022: Changes in Meteorological Variables by SO₂ Emissions over East Asia using a Linux-based U.K. Earth System Model, Korean Earth Sci. Soc., 43(1), 60−76, https://doi.org/10.5467/JKESS.2022.43.1.60 (Korean with English abstract)

36. Okjin Jung, Yun Seob Moon, Daeok Youn, and Hyunggyu Song, 2022: Time-Series Analysis and Estimation of Prospect Emissions and Prospected Reduction of Greenhouse Gas Emissions in Chungbuk, J. Korean Earth Sci. Soc., 43(1), 41−59, https://doi.org/10.5467/JKESS.2022.43.1.41

35. Youn, D., YH Park, 2021: Climate Change: Characteristics of Storms around Korea, Journal of Coastal Research 114 (SI): 256–260. https://doi.org/10.2112/JCR-SI114-052.1

34. Park, YH, D Youn, 2021: Characteristics of Storm Surge Based on the Forward Speed of the Storm, Journal of Coastal Research 114 (SI), 71-75. https://doi.org/10.2112/JCR-SI114-015.1

33. Kim, JH, SJ Kim, D Youn, MK Kim, JH Kim, J Kim, E Noh, 2021: Impact of North Atlantic-East Asian teleconnections on extremely high January PM10 cases in Korea, Environmental Pollution 290, 118051.

32. Seo, J., Lim, Y. B., Youn, D., Kim, J. Y., and Jin, H. C., 2020: Synergistic enhancement of urban haze by nitrate uptake into transported hygroscopic particles in the Asian continental outflow, Atmos. Chem. Phys., 20, 7575-7594, PDF, HTML, https://doi.org/10.5194/acp-20-7575-2020, https://doi.org/10.5194/acp-2019-1171.

31. Song, H., D. Youn, 2020: Comparisons of 1-Hour-Averaged Surface Temperatures from High-Resolution Reanalysis Data and Surface Observations, J. Kor. Earth Sci. Soc. (한국지구과학회지), 41(2), 59-110, HTML (Korean with English abstract).

30. Park, Y. H., D. Youn, 2020: The Study of a New Tidal Power for a Practical Use, Journal of Coastal Research, 95(sp1), 1500-1504, HTML.

29. Kim, J. H., D. Youn, Y. H. Kim, W. J. Shin, 2019: A Study on Characteristics and Countermeasures of Fine Dust Discharge Sources in Cheongju, J. of the assoc. of Kor. Geographers, 8(3), PDF (Korean with English abstract).

28. Ju, J., D. Youn, 2019: Statistically Analyzed Effects of Coal-Fired Power Plants in West Coast on the Surface Air Pollutants over Seoul Metropolitan Area, J. Kor. Earth Sci. Soc. (한국지구과학회지), 40(1), 24-34, HTML (Korean with English abstract).

27. Seo, J., Park, D.-S. R., Kim, J. Y., Youn, D., Lim, Y. B., and Kim, Y., 2018: Effects of meteorology and emissions on urban air quality: a quantitative statistical approach to long-term records (1999–2016) in Seoul, South Korea, Atmos. Chem. Phys., 18, 16121–16137, https://doi.org/10.5194/acp-18-16121-2018, HTML.

26. Youn, D., Y. H. Park, 2018: The Application of Mathematical Analysis to Examine the Beach Erosion along the Upper Texas Coast, Journal of Coastal Research 85 (sp1), 846-850, HTML.

25. Seo J., JY Kim, D Youn, JY Lee, H Kim, YB Lim, Y Kim, HC Jin, 2017: On the multiday haze in the Asian continental outflow: the important role of synoptic conditions combined with regional and local sources, Atmospheric Chemistry and Physics 17 (15), 9311, PDF, HTML.

24. Edward A. Keller, Duane E. Devecchio (지은이), 윤성효, 윤순옥, 김영석, 김지수, 이정현, 정형섭, 김진규, 박덕근, 김교원, 길영우, 윤대옥, 이준이, 하진욱, 이동진 (옮긴이), 2017: Natural Hazards: Earth's Processes as Hazards, Disasters, and Catastrophes, 4th Edition (자연재행와 방재), 시그마프레스, 2017년 7월

23. Kim, J. W., D. Youn, 2017: The Generation of Westerly Waves by Sobaek Mountains, J. Kor. Earth Sci. Soc. (한국지구과학회지), 38(1), 24-34, HTML (Korean with English abstract).

22. Park, Y. H., D. Youn, 2017: Applicability of a new tidal power system with reduced environmental impact, KAIS(한국산학기술학회지), 18(12)  (Korean with English abstract).

21. Jang, S., D. Youn, 2016: A teaching material using a laboratory ocean wave experiment to help students understand waves in the ocean, Sci. Edu. Res., 31(2).

20. J. Seo, D. Youn^*, J. Y. Kim, and H. Lee, 2014: Extensive spatio-temporal analyses of surface ozone and related meteorological variables in South Korea for 1999–2010, Atmospheric Chemistry and Physics,Atmos. Chem. Phys., 14, 6395-6415, 2014, doi:10.5194/acp-14-6395-2014 PDF, HTML (^*corresponding author)(SCI, IF=5.52, Rank=2.8%).

19. J. Seo, W. Choi, D. Youn,D.-S. R.Park, J. Y. Kim, 2013: Relationship between the stratospheric quasi-biennial oscillation and the spring rainfall in the western North Pacific, Geophysical Research Letters, online published html. (IF=3.505, Rank=top 7.2% (12/167)

18. Lee, H., Olsen, S. C.,Wuebbles, D. J., and Youn, D., 2013: Impacts of aircraft emissions on the air quality near the ground, Atmos. Chem. Phys., 13, 5505-5522, doi:10.5194/acp-13-5505-2013. PDF, html (SCI, IF=5.52, Rank=2.8%)

17. Lee, H., D. Youn^*, D. J. Wuebbles, and K. O. Patten, 2012: Diagnostic tools for evaluating quasi-horizontal transport in global-scale chemistry models, J. Geophys. Res., 117, D19302, doi:10.1029/2012JD017644. (^*corresponding author). PDF html (IF=3.303, Rank=9.0% (15/167))

16. Moon, B.-K., S.-W. Yeh, R. J.Park, C.-K. Song, and D. Youn, 2013: Effects of the El Nino on Tropospheric Ozone in a Simulation using Climate-Chemistry Model, J. Kor. Earth Sci. Soc. (한국지구과학회지), 34(7), 669-680 (Korean with English abstract).

15. Byung-Kwon Moon, Daeok Youn^*, Rokjin J. Park, Sang-Wook Yeh, et al., 2011: Meteorological Responses to a Volcanic Eruption in an Offline Climate-Chemistry Model: A Pilot Study, Asia-Pacific Journal of Atmospheric Sciences, 47(4), 345-351, doi: 10.1007/s13143-011-0021-z (^*corresponding author).  PDF  (IF=0.855, Rank=79.4% (54/68))

14. Youn, D., Park, R.J., Jeong, J.I., Moon, B.-K., Yeh, S.-W., Kim, Y.H., Woo, J.-H., Im, E.G., Jeong, J.-H., Lee, S.-J., and Song, C.-K., 2011: Impacts of aerosols on regional meteorology due to Siberian forest fires in May 2003, Atmospheric Environment, 45(7), 1407-1412, doi:10.1016/j.atmosenv.2010.12.028. PDF  html (IF=3.226, Rank=12.4% (24/193))

13. Wuebbles, D. J., Patten, K. O., Wang, D., Youn, D., Martínez-Avilés, M., and Francisco, J. S, 2011: Three-dimensional model evaluation of the Ozone Depletion Potentials for n-propyl bromide, trichloroethylene and perchloroethylene, Atmospheric Chemistry and Physics, 11, 2371-2380, doi: 10.5194/acp-11-2371-2011. PDF (IF=5.309, Rank=1.5% (1/68))

12. Youn, D., Patten, K. O., Wuebbles, D. J., Lee, H., and So, C.-W., 2010: Potential impact of iodinated replacement compounds CF3I and CH3I on atmospheric ozone: a three-dimensional modeling study, Atmospheric Chemistry and Physics, 10, 10129-10144, doi:10.5194/acp-10-10129-2010. PDF (IF=5.309, Rank=1.5% (1/68))

11. Park, R. J., D. Youn, S. H. Yoo, D. S. Han, B. J. Kang, and E. G. Im, 2010: A general parallelization approach to improve computation efficiency in a global chemical transport model (GEOS-Chem), Geochemical Journal, 44(4), 323-329. (IF=0.802, Rank=74.0% (57/77))

10. Park, R. J., M. J. Kim, J. I. Jeong, D. Youn, and S. Kim, 2010: A contribution of brown carbon aerosol to the aerosol light absorption and its radiative forcing in East Asia, Atmospheric Environment, 44, 1414-1421, doi:10.1016/j.atmosenv.2010.01.042. (IF=3.226, Rank=12.4% (24/193))

9. Youn, D., K. Patten, J.-T. Lin, and D. Wuebbles, 2009: Explicit Calculation of Indirect Global Warming Potentials for Halons using Atmospheric Models, Atmospheric Chemistry and Physics, 9, 8719-8733, doi:10.5194/acp-9-8719-2009. PDF(IF=5.309, Rank=1.5% (1/68))

8. Park, R. J., J. I. Jeong, D. Youn, 2009: A study of the Effects of Siberian Wildfires on Ozone Concentrations over East Asia in Spring 2003, Atmosphere (대기), 19 (3), 227-296 (Korean with English abstract).

7. Wuebbles, D. J., D. Youn, K. O. Patten, D. Wang, and M. Martinez-Aviles, 2009: Metrics for Ozone and Climate: Three-dimensional Modeling Studies of Ozone Depletion Potentials and Indirect Global Warming Potentials. In Twenty Years of Ozone Decline, C. Zerefos, G. Contopoulos and G. Skalkeas, editors, Springer Publishing, Dordrecht, The Netherlands, doi: 10.1007/978-90-481-2469-5.

6. Lin, J.-T., D. Youn, X.-Z. Liang, and D. J. Wuebbles, 2008: Global model simulation of summertime U.S. ozone diurnal cycle and its sensitivity to PBL mixing, spatial resolution, and emissions, Atmospheric Environment, 42(36), 8470-8483, doi:10.1016/j.atmosenv.2008.08.012. PDF html (IF=3.226, Rank=12.4% (24/193))

5. Jeong, J. I., R. J. Park, and D. Youn, 2008: Effects of Siberian forest fires on air quality in East Asia during May 2003 and its climate implication, Atmospheric Environment, 42(39), 8910-8922, doi:10.1016/j.atmosenv.2008.08.037. PDF, html (IF=3.226, Rank=12.4% (24/193))

4. Li, Y., K. O. Patten, D. Youn, and D. J. Wuebbles, 2006: Potential impacts of CF3I on ozone as a replacement for CF3Br in aircraft applications. Atmospheric Chemistry and Physics, 6, 4559-4569, doi:10.5194/acp-6-4559-2006. PDF html(IF=5.309, Rank=1.5% (1/68))

3. Youn, D., W. Choi, H. Lee, and D. J. Wuebbles, 2006: Interhemispheric differences in changes of long-lived tracers in the middle stratosphere over the last decade. Geophysical Research Letters, 33, L03807, doi:10.1029/2005GL024274. PDF (IF=3.505, Rank=top 7.2% (12/167)

2. Youn, D., D. J. Wuebbles, and M. B. Kalinowski, 2006: Global modeling of atmospheric Krypton-85 concentrations, INESAP Information Bulletin, No. 27, December 2006, pp. 13-16.

1. Choi, W., and D. Youn, 2000: Effects of Physical and Numerical Schemes on Model-Calculated Ozone Distribution in the Stratosphere. Korean J. Atm. Sci., 3, 39-52 (Full paper in English).