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Name Hans W. Chen
Phone +46 704566482
Address Sölvegatan 12, S-223 64 Lund, Sweden
2018 Ph.D. in Meteorology and Atmospheric Science, Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University Park, Pennsylvania.
  Dissertation: Toward improved regional estimates of carbon dioxide sources and sinks through coupled carbon–atmospheric data assimilation.
  Advisor: Fuqing Zhang. Co-advisors: Richard B. Alley and Thomas Lauvaux.
2012 M.S. in Atmospheric Sciences, Oceanography and Climate, Department of Meteorology, Stockholm University, Stockholm, Sweden.
  Thesis: The Barents Oscillation and its impact on the Arctic climate.
  Advisor: Heiner Körnich. Co-advisor: Qiong Zhang.
2010 B.S. in Meteorology, Department of Meteorology, Stockholm University, Stockholm, Sweden.
  Thesis: Local impact of soot on surface temperature in India and Sweden.
  Advisor: Annica Ekman. Co-advisor: Henning Rodhe.
2020–present Researcher, Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden.
2018–2020 Postdoctoral Fellow, Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden.
  Awards and honors
2020 NASA Group Achievement Award, NASA Langley Research Center.
  For exceptional scientific achievements of the ACT-America Earth Venture Suborbital mission.
2020 Stiftelsen Landshövding Per Westlings Minnesfond, Lund University.
2018 Outstanding Student Paper Award, American Meteorological Society, 20th Conference on Atmospheric Chemistry.
2016 Öfverdirektör Elis Sidenbladhs fond, Royal Swedish Academy of Sciences.
2016 Top 5 most highly cited papers 2014–2016 in Environmental Development, Environmental Development, Elsevier.
2016 Travel Support, University Corporation for Atmospheric Research.
2014 Hans Neuberger Award, The Pennsylvania State University.
  For excellent teaching of meteorology.
2014 Chi Epsilon Pi, The Pennsylvania State University.
  National meteorology honor society.
2013 Travel Support, American Meteorological Society.
  Comissions of trust
2021–present Deputy in the CoCO2 General Assembly.
2022–2025 Principal Investigator, Improved monitoring of carbon dioxide emissions in Scandinavia using satellite and ground-based observations. Research projects for early-career researchers, Formas.
2021–2024 Principal Investigator, High-resolution carbon cycle data assimilation with multiple satellite observations, Joint China–Sweden Mobility, Stiftelsen för internationalisering av högre utbildning och forskning.
  Peer-reviewed publications
2021 Kaminski, T., M. Scholze, P. Rayner, M. Voßbeck, M. Buchwitz, M. Reuter, W. Knorr, H. W. Chen, A. Agusti-Panareda, A. Löscher, and Y. Meijer (2021): Assimilation of atmospheric CO2 observations from space can support national CO2 emission inventories. Environmental Research Letters, doi:10.1088/1748-9326/ac3cea.
2021 Bin, H., C. Chen, S. Lin, W. Yuan, H. W. Chen, D. Chen, Y. Zhang, L. Guo, X. Zhao, X. Liu, Z. Zhong, R. Wang, and R. Tang (2021): Worldwide impacts of atmospheric vapor pressure deficit on the interannual variability of terrestrial carbon sinks. National Science Review, doi:10.1093/nsr/nwab150.
2021 Cai, Z., Q. You, F. Wu, H. W. Chen, D. Chen, and J. Cohen (2021): Arctic warming revealed by multiple CMIP6 models: evaluation of historical simulations and quantification of future projection uncertainties. Journal of Climate, 34(12), 4871–4892. doi:10.1175/JCLI-D-20-0791.1.
2021 Lai, H.-W., H. W. Chen, J. Kukulies, T. Ou, and D. Chen (2021): Regionalization of seasonal precipitation over the Tibetan Plateau and associated large-scale atmospheric systems. Journal of Climate, 34(7), 2635–2651. doi:10.1175/JCLI-D-20-0521.1.
2020 Cohen, J., X. Zhang, J. Francis, T. Jung, R. Kwok, J. Overland, T. Ballinger, U. S. Bhatt, H. W. Chen, D. Coumou, S. Feldstein, D. Handorf, G. Henderson, M. Ionita, M. Kretschmer, F. Laliberte, S. Lee, H. W. Linderholm, W. Maslowski, Y. Peings, K. Pfeiffer, I. Rigor, T. Semmler, J. Stroeve, P. C. Taylor, S. Vavrus, T. Vihma, S. Wang, M. Wendisch, Y. Wu, and J. Yoon (2020): Divergent consensus on the influence of Arctic amplification on mid-latitude severe winter weather. Nature Climate Change, 10, 20–29. doi:10.1038/s41558-019-0662-y.
2019 Chen, H. W., L. N. Zhang, F. Zhang, K. J. Davis, T. Lauvaux, S. Pal, B. Gaudet, and J. P. DiGangi (2019): Evaluation of regional CO2 mole fractions in the ECMWF CAMS real-time atmospheric analysis and NOAA CarbonTracker Near-Real Time reanalysis with airborne observations from ACT-America field campaigns. Journal of Geophysical Research–Atmospheres, 124, 8119–8133. doi:10.1029/2018JD029992.
2019 Chen, H. W., F. Zhang, T. Lauvaux, K. J. Davis, S. Feng, M. P. Butler, and R. B. Alley (2019): Characterization of regional-scale CO2 transport uncertainties in an ensemble with flow-dependent transport errors. Geophysical Research Letters, 46, 4049–4058. doi:10.1029/2018GL081341.
2016 Chen, H. W., R. B. Alley, and F. Zhang (2016): Interannual Arctic sea ice variability and associated winter weather patterns: A regional perspective for 1979–2014. Journal of Geophysical Research–Atmospheres. 121, 14,433–14,455, doi:10.1002/2016JD024769.
2016 Chen, H. W., F. Zhang, and R. B. Alley (2016): The robustness of midlatitude weather pattern changes due to Arctic sea ice loss. Journal of Climate, 29, 7831–7849, doi:10.1175/JCLI-D-16-0167.1.
2013 Chen, H. W., Q. Zhang, H. Körnich, and D. Chen (2013): A robust mode of climate variability in the Arctic: The Barents Oscillation. Geophysical Research Letters, 40, 2856–2861, doi:10.1002/grl.50551.
2013 Chen, D. and H. W. Chen (2013): Using the Köppen classification to quantify climate variation and change: An example for 1901–2010. Environmental Development, 6, 69–79, doi:10.1016/j.envdev.2013.03.007.
  Submitted manuscripts
2021 Fang, M., X. Li, D. Chen, and H. W. Chen (2020): What drives Arctic amplification variations on multi-decadal to century time scales? Submitted.
2021 Kaminski, T., M. Scholze, P. Rayner, M. Voßbeck, M. Buchwitz, M. Reuter, W. Knorr, H. W. Chen, A. Agusti-Panareda, A. Löscher, and Y. Meijer (2020): Atmospheric CO2 observations from space can support national inventories. In preparation for resubmission.
2021 Wang, X., Y Ran, G. Pang, D. Chen, B. Su, R. Chen, X. Li, H. W. Chen, M. Yang, R. Li, X. Peng, T. Wu, G. Wan, D. Luo (2021): A comparison between past and future permafrost changes in the Arctic and the Tibetan Plateau and possible links between them. Submitted to Earth-Science Reviews.
2021 Cai, Z., Q. You, H. W. Chen, R. Zhang, D. Chen, J. Chen, S. Kang, J. Cohen (2021): Amplified wintertime Barents Sea warming linked to intensified Barents Oscillation. Submitted to Environmental Research Letters.
  Other publications
2020 Scholze, M., H. Chen, T. Kaminski, and M. Voßbeck (2020): Inversion strategy based on joint QND assessments. CHE Consortium.
2018 Chen, H. and M. Scholze (2018): Progress in characterizing uncertainty for fossil fuel emissions. CHE Consortium.
2018 Ying, Y., X. Chen, Y. Zhang, M. Minamide, R. Nystrom, H. Chen, J. Poterjoy, C. Melhauser, Y. Weng, Z. Meng, A. Aksoy, and F. Zhang (2018): PSU WRF EnKF/4DVar hybrid regional data assimilation system: Technical notes.
2018 Cohen, J., X. Zhang, J. Francis, T. Jung, R. Kwok, J. Overland, P. C. Tayler, S. Lee, F. Laliberte, S. Feldstein, W. Maslowski, G. Henderson, J. Stroeve, D. Coumou, D. Handorf, T. Semmler, T. Ballinger, M. Hell, M. Kretschmer, S. Vavrus, M. Wang, S. Wang, Y. Wu, T. Vihma, U. Bhatt, M. Ionita, H. Linderholm, I. Rigor, C. Routson, D. Singh, M. Wendisch, D. Smith, J. Screen, J. Yoon, Y. Peings, H. Chen, and R. Blackport (2018): Arctic change and possible influence on mid-latitude climate and weather: a US CLIVAR White Paper. U.S. CLIVAR White Paper 2018-1, 41 pp. doi:10.5065/D6TH8KGW.
  Invited talks
2021 Assessing the uncertainty in top-down greenhouse gas emissions estimates, to be presented at the Asia Oceania Geosciences Society Virtual 18th Annual Meeting.
2020 Coupled carbon–atmospheric data assimilation through ensemble-based simultaneous state and parameter estimation, Fuqing Zhang Symposium (canceled due to Covid-19).
2018 Monitoring Earth’s carbon cycle and human fossil fuel emissions with the help of advanced data assimilation methods, Second ADAPT Symposium on Advanced Understanding, Monitoring and Prediction of Weather, Climate and Environmental systems.
2018 Constraining surface carbon dioxide fluxes using advanced data assimilation techniques, 98th American Meteorological Society Annual Meeting.
  Teaching experience
2019–present Lund University
  ○ Theory and Methods of Physical Geography:
  Contributing instructor (Fall 2019, Fall 2020 online, Fall 2021).
2013–2017 The Pennsylvania State University
  ○ Co-advisor for research project (Summer 2017).
  ○ Introduction to Programming Techniques for Meteorology:
  Main instructor and course developer (Spring 2015), Teaching assistant (Spring 2013).
  ○ Applications of Computers to Meteorology:
  Co-instructor (Fall 2013), Teaching assistant (Fall 2014, Spring 2014).
  ○ Synoptic Meteorology Laboratory:
  Teaching assistant (Fall 2015).
2021 Interview for the European Environment Agency COINS project, about monitoring CO2 emissions on city scales using top-down and inverse approaches.
Research websites, over 223,000 views and 79,000 unique visitors since 2013. Example:
  Service to profession
2020–2021 Organizer of department seminar series, Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden.
Reviewer for the following journals:
  Nature Climate Change, Atmospheric Chemistry and Physics, Geophysical Research Letters, Journal of Geophysical Research: Atmospheres.
  Non-academic work
2008 Computer programmer, IVL Swedish Environmental Research Institute, Gothenburg, Sweden.
  Other relevant experiences
2016 NCAR Advanced Study Program Summer Colloquium, Advances in Air Quality Analysis and Prediction: The Interaction of Science and Policy, National Center for Atmospheric Research, Colorado.
  Computer skills    
OS Linux, Unix, Windows, macOS Graphics Adobe Photoshop, Inkscape
Programming Python, Fortran, C++, C Typography LaTeX
Numerical MATLAB, Mathematica Office suites Microsoft Office, LibreOffice
Shell script Bash, Z shell Other Git, regular expressions, HTML, CSS
Native Swedish
Fluent English
Mother tongue Mandarin, fluent speaking, basic reading and writing.
Basic German
2021 Data assimilation and simultaneous state–parameter estimation for CO2 inversion, Pufendorf inverse modeling workshop, Oral.
2021 Arctic–midlatitude linkages: why is it still controversial? Arctic workshop: Multi-disciplinary perspectives on a changing Arctic, Online.
2021 Assessment of radiocarbon observations for constraining fossil fuel emissions in a comprehensive Carbon Cycle Fossil Fuel Data Assimilation System, EGU General Assembly 2021, Online Oral.
2020 Assessment of capability of in-situ and satellite CO2 observations to monitor CO2 fossil fuel emissions, comprehensive Carbon Cycle Fossil Fuel Data Assimilation System, Asia Oceania Geosciences Society Annual Meeting, Oral (canceled due to Covid-19).
2020 Assessments of in situ and remotely sensed CO2 observations in a Carbon Cycle Fossil Fuel Data Assimilation System to estimate fossil fuel emissions, EGU General Assembly 2020, Text Chat.
2019 Potential benefit of 14CO2 observations in CO2 inversions quantified using the coupled Carbon Cycle Fossil Fuel Data Assimilation System, IG3IS–Transcom workshop 2019, Poster.
2018 Characterizing CO2 transport errors for regional inversions using a coupled carbon–atmospheric data assimilation system, AGU Fall Meeting 2018, Poster.
2018 Arctic–mid latitude linkages: Lessons learned and future coordinated modeling experiments, 8th Third Pole Environment Workshop, Oral.
2018 Estimating CO2 surface fluxes using atmospheric CO2 concentration: How an atmospheric scientist became interested in plants, INES Thursday seminar series, Oral.
2018 Characterizing CO2 transport errors for regional inversions using a coupled carbon–atmospheric data assimilation system, AGU Fall Meeting 2018, Poster.
2018 A joint regional carbon–atmosphere inversion system with explicit treatment of transport uncertainties, IG3IS–Transcom workshop 2018, Poster.
2018 Progress toward estimating | surface carbon dioxide fluxes at the regional scale using an augmented ensemble Kalman filter, 98th American Meteorological Society Annual Meeting, Poster.
2017 Towards improved estimates of regional CO2 fluxes: A unified carbon and meteorological data assimilation system, 2017 Joint NACP and AmeriFlux Principal Investigators Meeting, Poster.
2017 The robustness of mid-latitude weather pattern changes due to Arctic sea-ice loss, 2017 Arctic Mid-Latitude Workshop, Poster and Lightning Talk.
2016 Nonlinear atmospheric response to Arctic sea-ice loss under different sea ice scenarios, ADAPT Symposium on Advanced Assimilation and Uncertainty Quantification in BigData Research for Weather, Climate and Earth System Monitoring and Prediction, Oral.
2016 Predictability of mid-latitude extreme weather changes in response to Arctic sea ice loss, 96th American Meteorological Society Annual Meeting, Poster.
2014 Dynamics and predictability of atmospheric response to reduced Arctic sea ice through ensemble sensitivity analysis, World Weather Open Science Conference 2014, Oral.