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Birgit Hassler

Position: Research Scientist 

Email address: birgit@bodekerscientific.com

Academic Qualifications

  • October 2009 : Ph.D. in Meteorology
Ludwig-Maximilians-Universität München, Germany
-Thesis: Global patterns in halogen-induced changes in vertically resolved stratospheric ozone
-PhD supervisor: Prof. Dr. Martin Dameris
  • 2007-2009 : Ph.D. student
National Institute of Water and Atmospheric Research (NIWA), Lauder, New Zealand 
Supervisor: Dr. Greg Bodeker
  • Febuary 2006-June 2006: Ph.D. qualifying exams (oral)
Ludwig-Maximilians-Universität München, Germany
  • 2001: Diplom in Hydrology (M.Sc.)
      Albert-Ludwigs-Universität Freiburg, Germany
      -Thesis: The influence of climate variability on hydrological drought in Europe- scenarios
      • 1996-1997: Study Abroad 
      Scholarship to the University of Freiburg’s exchange program Brock University, Ontario, Canada
      • 1996: Vordiplom (Intermediate oral exams/undergraduate degree)
        Albert-Ludwigs-Universität Freiburg, Germany


        Research Experience

        • October 2015-Present: Research Scientist
        Bodeker Scientific, Alexandra, New Zealand
        • May 2015-September 2015:Research Scientist II
        Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder, Boulder, USA, and NOAA Earth System Research Laboratories, Boulder, USA
          •  science advisor: Dr. Karen H. Rosenlof
        • May 2013-May 2015:Research Scientist I
        Cooperative Institute for Research in Environmental Sciences (CIRES),

        University of Colorado at Boulder, Boulder, USA, and

        NOAA Earth System Research Laboratories, Boulder, USA
          • Science advisor: Dr. Karen H. Rosenlof
        • March 2013-May 2013:Contractor for Bodeker Scientific, Alexandra, New Zealand
        Software development (IDL) for GOME-2 ozone retrieval validation
        • December 2009-April 2013:Postdoctoral Fellow
        Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder, Boulder, USA, and NOAA Earth System Research Laboratories, Boulder, USA
          •  science advisor until 05/2011: Dr. Susan Solomon
          • science advisor 06/2011-05/2012: Dr. John S. Daniel
          •  science advisor since 06/2012: Dr. Karen H. Rosenlof
          • 12/2012: 2-week field campaign at the Amundsen-Scott South Pole station in Antarctica, establishing a newly calibrated Dobson spectrophotometer and adjusting a Brewer spectrophotometer
        • May 2009 -November 2009:Research assistant
        Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
        • July 2008-August 2008:Visiting scientist
        Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
        • November 2006:Scientist (freelance)
        contract from: Meteorological Observatory Hohenpeissenberg, Germany
        • March 2006 - April 2006:Consultant for
        Finnish Meteorological Institute (FMI), Finland
          •  performing Dobson spectrophotometer measurements for the first “Sodankylä totAl colUmn ozoNe intercompArison” (SAUNA) campaign
        • 2004-2006:Research Assistant (precipitation radar research group)
        Meteorological Observatory Hohenpeissenberg, Germany
        • 2001-2004:Research Assistant (ozone research group)
        Meteorological Observatory Hohenpeissenberg, Germany
          •  statistical analyses of ozone sonde and lidar measurements and comparisons with chemistry-climate model output
          •  routine ozone and temperature lidar measurements
        • 1990:Internship
        CRS4, Centro di Ricerca, Sviluppo e Studi Superiori in Sardegna, Cagliari, Sardinia/Italy


        Awards and Travel grants 

        • Dobson award from the International Ozone Commission (IO3C), Edinburgh/Scotland, 2016
        • Travel grant award: To attend the SPARC General Assembly in Queenstown, New Zealand, 2014. ($1800)
        • Travel grant award: To attend the CCMI Workshop in Lancaster, UK, 2014. ($460)
        • Travel grant award: To attend the Workshop on the Climatic Effects of Ozone Depletion in the Southern Hemisphere in Buenos Aires, Argentina, 2013. ($1100, and waived registration fee)
        • Open Access Publication Support: Financial support to publish a paper in an Open Access Journal, CU, Boulder, USA, 2013. ($2000)
        • Travel grant award: To attend the SI2N Workshop in Helsinki, Finland, 2013. ($860, and airfare)
        • Travel grant award: To attend the 2012 Quadrennial Ozone Symposium in Toronto, Canada, 2012. ($2000 CAN)
        • Outstanding Poster Presentation Award: Outstanding poster presentation at the WCRP Open Science Conference by a young scientist, 2011. (Annual AGU membership)
        • Travel grant award: To attend the 2011 IYC Symposium on Stratospheric Ozone and Climate Change in Washington, DC, USA, 2011. (Registration fee, abstract fee, contribution to accommodation and airfare up to $500)
        • PhD grant from the German Academic Exchange Service (DAAD): One year grant (salary and travel support) to do research for my PhD in New Zealand at NIWA, 2007.

        Professional Services

        • Elected member of the International Ozone Commission (IO3C) (09/2016 – present)
        • Contributing author of Chapter 6, and reviewer of Chapter 2 of the Tropospheric Ozone Assessment Report (TOAR), 2017
        • Contributing author of Chapter 2 and Chapter 3 of the Scientific Assessment of Ozone Depletion, 2014
        • Invited reviewer for NASA proposals for the Suomi NPP Atmosphere Panel, and the KORUS-AQ mission
        • Invited expert speaker for the 9th Meeting of Ozone Research Managers at WMO, Geneva, Switzerland
        • Reviewer of Chapter 2 of the Working Group I contribution to the IPCC Fifth Assessment Report, 2013
        • Reviewer of Chapter 3 of the Scientific Assessment of Ozone Depletion, 2010
        • Reviewer for the journals Atmospheric Chemistry and Physics, Geophysical Research Letters, Journal of Atmospheric Sciences, International Journal of Climatology, Atmospheric Measurement Techniques, and Atmospheric Science Letters.
        •  Chair of Poster Session A33C: Atmospheric Sciences General Contributions: Tropospheric and Stratospheric Ozone II at the AGU Fall Meeting 2010, San Francisco. USA.
        • Featured scientist for a science writing class at Colorado University at Boulder 
        • Mentor in the German e-mentoring program “CyberMentor” in 2011 and 2012 for female high school students interested in STEM subjects
        • Judge at Science Fairs and Science Bowls
        • Participant in the Earth Explorer Program (science program for 7th and 8th graders)
        • Participant in outreach activities for high school students in the Boulder area

        Refereed Publications (21)

        1. Hassler, B., B.C. McDonald, G.J. Frost, et al. (2016), Analysis of long-term

        observations of NOx and CO in megacities and application to constraining

        emissions inventories, Geophys. Res. Lett., 43, doi:10.1002/2016GL069894.

        2. Davis, S.M., K.H. Rosenlof, B. Hassler, et al. (2016), The Stratospheric Water

        and Ozone Satellite Homogenized (SWOOSH) database: A long-term

        database for climate studies, Earth Syst. Sci. Data, 8, 461–490,

        doi:10.5194/essd-8-461-2016.

        3. Harris, N.R.P., B. Hassler, F. Tummon, et al. (2015), Past changes in the

        vertical distribution of ozone - Part 3: Analysis and interpretation of trends,

        Atmos. Chem. Phys., 15, 9965-9982, doi:10.5194/acp-15-9965-2015. (Highlighted

        on the ACP webpage)

        4. Tummon, F., B. Hassler, N.R.P. Harris, et al. (2015), Intercomparison of

        vertically resolved merged satellite ozone data sets: interannual variability

        and long-term trends, Atmos. Chem. Phys., 15, 3021-3043, doi:10.5194/acp-15-

        3021-2015. (Highlighted on the ACP webpage)

        5. Ossó, A., Y. Sola, K.H. Rosenlof, B. Hassler, J. Bech, and J. Lorente (2015),

        How robust are trends in the Bewer-Dobson circulation derived from

        observed stratospheric temperatures?, J. Clim., 28(8), 3024-3040,

        doi:10.1175/JCLI-D-14-00295.1.

        6. Young, P.J., S.M. Davis, B. Hassler, S. Solomon, and K.H. Rosenlof (2014),

        Modeling the climate impact of Southern Hemisphere ozone depletion: The

        importance of the ozone dataset, Geophys. Res. Lett., 41, 9033-9039,

        doi:10.1002/2014GL061738.

        7. Hassler, B., I. Petropavlovskikh, J. Staehelin, et al. (2014), Past changes in the

        vertical distribution of ozone – Part 1: Measurement techniques,

        uncertainties and availability, Atmos. Meas. Tech., 7 (5), 1395-1427,

        doi:10.5194/amt-7-1395-2014.

        8. Sofieva, V.F., J. Tamminen, E. Kyrola, T. Mielonen, P. Veefkind, B. Hassler, and

        G.E. Bodeker (2014), A novel tropopause-related climatology of ozone

        profiles, Atmos. Chem. Phys., 14 (1), 283-299, doi:10.5194/acp-14-283-2014.

        9. Bodeker, G.E., B. Hassler, P.J. Young, and R.W. Portmann (2013), A vertically

        resolved, global, gap-free ozone database for assessing or constraining

        global climate model simulations, Earth Syst. Sci. Data, 5(1), 31–43,

        doi:10.5194/essd-5-31-2013.

        10. Brönnimann, S., J. Bhend, J. Franke, A.M. Fischer, R. Bleisch, G. Bodeker, B.

        Hassler, E. Rozanov, and M. Schraner (2013), A global historical ozone data

        set and signatures of El Niño and the 11-yr solar cycle, Atmos. Chem. Phys., 13

        (18), 9623-9639, doi:10.5194/acp-13-9623-2013.

        Birgit Hassler Publications

        11. Evan, S., K.H. Rosenlof, J. Dudhia, B. Hassler, and S.M. Davis (2013), The

        representation of the TTL in a tropical channel version of the WRF model, J.

        Geophys. Res., 118 (7), 2835-2848, doi:10.1002/jgrd.50288.

        12. Hassler, B., P.J. Young, R.W. Portmann, G.E. Bodeker, J.S. Daniel, K.H.

        Rosenlof, S. Solomon (2013), Comparison of three vertically resolved ozone

        data bases: climatology, trends and radiative forcings, Atmos. Chem. Phys., 13

        (11), 5533-5550, doi:10.5194/acp-13-5533-2013.

        13. Helmert, K., B. Hassler, and J.E.E. Seltmann (2012), An operational tool to

        quality control 2D radar reflectivity data for assimilation in COSMO-DE, Int. J.

        Remote Sens., 33, 3456-3471, doi:10.1080/01431161.2011.592161.

        14. Solomon, S., P.J. Young, and B. Hassler (2012), Uncertainties in the evolution

        of stratospheric ozone and implications for recent temperature changes in

        the tropical lower stratosphere, Geophys. Res. Lett., 39,

        doi:10.1029/2012GL052723.

        15. Hassler, B., J.S. Daniel, B.J. Johnson, S. Solomon, and S.J. Oltmans (2011), An

        assessment of changing ozone loss rates at South Pole: Twenty-five years of

        ozonesonde measurements, J. Geophys. Res., 116(D22),

        doi:10.1029/2011JD016353. (EOS Research Spotlight)

        16. Hassler, B., G.E. Bodeker, S. Solomon, and P.J. Young (2011), Changes in the

        polar vortex: Effects on Antarctic total ozone observations at various

        stations, Geophys. Res. Lett., 38, L01805, doi:10.1029/2010GL045542.

        17. Karpechko, A.Y., N.P. Gillett, B. Hassler, K.H. Rosenlof, and E. Rozanov (2010),

        Quantitative assessment of Southern Hemisphere ozone in chemistry-climate

        model simulations, Atmos. Chem. Phys., 10, 1385-1400, doi:10.5194/acp-10-1385-

        2010.

        18. Hassler, B., G.E. Bodeker, I. Cionni, and M. Dameris (2009), A vertically

        resolved, monthly mean, ozone database from 1979 to 2100 for constraining

        global climate model simulations, Internatational Journal of Remote Sensing,

        30 (15-16), 4009-4018, doi:10.1080/01431160902821874.

        19. Hassler, B., G.E. Bodeker, and M. Dameris (2008), Technical Note: A new

        global database of trace gases and aerosols from multiple sources of high

        vertical resolution measurements, Atmos. Chem. Phys., 8, 5403-5421.

        20. Steinbrecht, W., B. Hassler, C. Bruhl, M. Dameris, M.A. Giorgetta, V. Grewe, E.

        Manzini, S. Matthes, C. Schnadt, B. Steil, and P. Winkler (2006), Interannual

        variation patterns of total ozone and lower stratospheric temperature in

        observations and model simulations, Atmos. Chem. Phys., 6, 349-374.

        21. Steinbrecht, W., B. Hassler, H. Claude, P. Winkler, and R.S. Stolarski (2003),

        Global distribution of total ozone and lower stratospheric temperature

        variations, Atmos. Chem. Phys., 3, 1421-1438.
        Comments