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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 Co-Investigator, National Strategic Research Program BECC (Biodiversity and Ecosystem services in a Changing Climate), research grant
  The impact of warming-induced summer vegetation drought on the vegetation greening, tree growth and carbon fluxes in Sweden.
2022–2025 Principal Investigator, Swedish National Space Agency, Call 2021-C, career grant
  Monitoring anthropogenic carbon dioxide emissions from space.
2022–2025 Principal Investigator, Formas. Research projects for early-career researchers, career grant (declined)
  Improved monitoring of carbon dioxide emissions in Scandinavia using satellite and ground-based observations.
2021–2024 Principal Investigator, Stiftelsen för internationalisering av högre utbildning och forskning, Joint China–Sweden Mobility, mobility grant
  High-resolution carbon cycle data assimilation with multiple satellite observations.
  Peer-reviewed publications
  * indicates corresponding author(s)
2022 Wang X., Y. Ran*, Y. Pang, D. Chen, B. Su, R. Chen, X. Li, H. W. Chen, M. Yang, X. Gou, M. T. Jorgenson, J. Aalto, R. Li, X. Peng, T. Wu, G. D. Clow, G. Wan, X. Wu, and D. Luo (2022): Contrasting characteristics, changes, and linkages of permafrost between the Arctic and the Third Pole. Earth-Science Reviews, 230, 104042, doi:10.1016/j.earscirev.2022.104042.
2022 Kaminski, T.*, M. Scholze, P. Rayner, S. Houweling, M. Voßbeck, J. Silver, S. Lama, M. Buchwitz, M. Reuter, W. Knorr, H. W. Chen, G. Kuhlmann, D. Brunner, S. Dellaert, H. A. C. Denier van der Gon, I. Super, A. Löscher, and Y. Meijer (2022): Assessing the constraint of atmospheric CO2 and NO2 measurements from space on city-scale fossil fuel CO2 emissions in a data assimilation system. Frontiers in Remote Sensing, 3, doi:10.3389/frsen.2022.887456.
2022 Fang, M., X. Li*, H. W. Chen*, and D. Chen (2022): Arctic amplification modulated by Atlantic Multidecadal Oscillation and greenhouse forcing on multidecadal to century scales. Nature Communications, 13, 1865, doi:10.1038/s41467-022-29523-x.
2022 Cai, Z., Q. You*, H. W. Chen, R. Zhang*, D. Chen, J. Chen, S. Kang, J. Cohen (2022): Amplified wintertime Barents Sea warming linked to intensified Barents Oscillation. Environmental Research Letters, 17, 044068, doi:10.1088/1748-9326/ac5bb3.
2022 Tang, R., B. He*, H. W. Chen, D. Chen, Y. Chen*, Y. H. Fu, W. Yuan, B. Li, Z. Li, L. Guo, X. Hao, and L. Sun (2022): Increasing terrestrial ecosystem carbon release in response to autumn cooling and warming. Nature Climate Change, 12, 380–385, doi:10.1038/s41558-022-01304-w.
2022 Kaminski, T.*, M. Scholze, P. Rayner, M. Voßbeck, M. Buchwitz, M. Reuter, W. Knorr, H. Chen, A. Agusti-Panareda, A. Löscher, and Y. Meijer (2022): Assimilation of atmospheric CO2 observations from space can support national CO2 emission inventories. Environmental Research Letters, 17, 014015, 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
2022 Zhong, Z., B. He, Y.-P. Wang, H. W. Chen, D. Chen, Y. H. Fu, Y. Chen, L. Guo, Y. Deng, L. Huang, W. Yuan, X. Hao, R. Tang, H. Liu, L. Sun, X. Xie, and Y. Zhang (2022): Disentangling the effects of vapor pressure deficit on terrestrial ecosystem productivity. Nature Communications, under review.
2022 Chen, H. W., F. Zhang, T. Lauvaux, M. Scholze, K. J. Davis, and R. B. Alley (2022): Regional CO2 inversion through ensemble-based simultaneous state and parameter estimation: TRACE framework and controlled experiments. Journal of Advances in Modeling Earth Systems, under review.
2022 Cai, Z., Q. You, H. W. Chen, R. Zhang, Z. Zuo, G. Dai, D. Chen, and J. Cohen (2022): An emerging internal driver of the simulated wintertime Barents Sea warming. npj Climate and Atmospheric Science, submitted.
  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 Monitoring anthropogenic carbon dioxide emissions from space, Swedish Space Researchers 2022
2021 Assessing the uncertainty in top-down greenhouse gas emissions estimates, 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
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
  Teaching experience
2019–present Lund University
  ○ Supervisor for Bachelor's thesis (Spring 2022).
  ○ Co-instructor for undergraduate courses:
  The Climate System (Spring 2022),
  Theory and Methods of Physical Geography (Fall 2019, Fall 2020 online, Fall 2021).
2013–2017 The Pennsylvania State University
  ○ Main instructor and course developer for undergraduate course:
  Introduction to Programming Techniques for Meteorology (Spring 2015).
  ○ Co-instructor for undergraduate course:
  Applications of Computers to Meteorology (Fall 2013).
  ○ Co-advisor for research project (Summer 2017).
  ○ Teaching assistant:
  Synoptic Meteorology Laboratory (Fall 2015),
  Applications of Computers to Meteorology (Fall 2014, Spring 2014),
  Introduction to Programming Techniques for Meteorology (Spring 2013).
2021 Interview for the Extrakt online magazine, about using satellite observations to track anthropogenic CO2 emissions
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 245,000 views and 93,000 unique visitors since 2013. Example:
  Service to profession
2022–present Young Editorial Member for Advances in Climate Change Research (IF=4.7)
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. Climate Dynamics.
  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
  Selected presentations
2022 Monitoring greenhouse gas emissions and removals using satellites, Swedish Climate Symposium 2022, Oral
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
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 Arctic–mid latitude linkages: Lessons learned and future coordinated modeling experiments, 8th Third Pole Environment Workshop, Oral