Tina Christensen

Research Scientist, PhD
Middle Atmosphere Research Group
Danish Climate Centre
Danish Meteorological Institute
Lyngbyvej 100
DK-2100 Copenhagen Ø
Phone: +45 39 15 74 96
FAX: +45 39 15 74 61
E-mail: tic@dmi.dk

Research Areas

Stratospheric ozone depletion

Arctic ozone depletion in the stratosphere occurs each winter with different strength depending on conditions such as the strength of the arctic vortex (the dynamical conditions), temperature development, amounts of aerosols and trace constituents and presence of polar stratospheric clouds. Meteorological conditions and the amount of ozone present is monitored throughout the winter from many stations operated by many countries. Through the EU project QUOBI I have been involved in performing calculations of the ozone depletion in the winter 2002/03 by the vortex-averaged method.

The tropical tropopause layer

The lower stratosphere has a very low water vapour content compared to the troposphere. Air is mainly transported from the troposphere to the stratosphere in the tropical region. The amount of water is largely controlled by the temperature at the cold point, as slowly ascending air masses are subject to freeze drying. Sometimes deep convective events overshoots into the lower stratosphere with a potential moistening effect.

In order to better understand the dynamics, chemistry and physics of the tropical tropopause layer, stratospheric balloons financed by the EU project HIBISCUS were flown in the tropics. I have been involved in validating winds and temperatures as derived from the ECMWF model with in-situ measurements from the balloons.

During the European SCOUT-O3 project I have participated in 2006 and 2008 in balloon campaigns in West Africa, investigating convective overshoot events.

Education

June 1997: MSc in Astrophysics, University of Aarhus, Denmark
December 2002: Ph.D. in Space Physics, Geophysical Department of the Niels Bohr Institute, Copenhagen University; Research carried out at the Solar-Terrestrial Physics Division, DMI

Work Experience

Since July 2007: Scientist, Programme for Atmospheric Processes, Danish Climate Centre, DMI
Since October 2006: Scientist, Programme for Atmospheric Processes, R&D Dept., DMI
January 2003-September 2006: Post. Doc., Middle Atmosphere Research Division, DMI
August 1999-December 2002: PhD Student, Solar-Terrestrial Physics Division, DMI and Niels Bohr Institute, Copenhagen University.
June 1998-July 1999: Research Scientist, Solar-Terrestrial Physics Division, DMI
August 1996-May 1997: Support Astronomer, Nordic Optical Telescope, Spain

List of Publications

Publications in refereed journals: Hydration of the lower stratosphere by ice crystal geysers over land convective systems; Khaykin, S., J.-P. Pommereau, L. Korshunov, V. Yushkov, J. Nielsen, N. Larsen T. Christensen, A. Garnier, A. Lukyanov, and E. Williams; Atmos. Chem. Phys., 9, 2275-2286, 2009; Available at the ACP web site.; Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE); E. Dupuy, K. A. Walker, J. Kar, C. D. Boone, C. T. McElroy, P. F. Bernath, J. R. Drummond, R. Skelton, S. D. McLeod, R. C. Hughes, C. R. Nowlan, D. G. Dufour, J. Zou, F. Nichitiu, K. Strong, P. Baron, R. M. Bevilacqua, T. Blumenstock, G. E. Bodeker, T. Borsdorff, A. E. Bourassa, H. Bovensmann, I. S. Boyd, A. Bracher, C. Brogniez, J. P. Burrows, V. Catoire, S. Ceccherini, S. Chabrillat, T. Christensen, M. T. Coffey, U. Cortesi, J. Davies, C. De Clercq, D. A. Degenstein, M. De Mazière, P. Demoulin, J. Dodion, B. Firanski, H. Fischer, G. Forbes, L. Froidevaux, D. Fussen, P. Gerard, S. Godin-Beekman, F. Goutail, J. Granville, D. Griffith, C. S. Haley, J. W. Hannigan, M. Höpfner, J. J. Jin, A. Jones, N. B. Jones, K. Jucks, A. Kagawa, Y. Kasai, T. E. Kerzenmacher, A. Kleinböhl, A. R. Klekociuk, I. Kramer, H. Küllmann, J. Kuttippurath, E. Kyrölä, J.-C. Lambert, N. J. Livesey, E. J. Llewellyn, N. D. Lloyd, E. Mahieu, G. L. Manney, B. T. Marshall, J. C. McConnell, M. P. McCormick, I. S. McDermid, M. McHugh, C. A. McLinden, J. Mellqvist, K. Mizutani, Y. Murayama, D. P. Murtagh, H. Oelhaf, A. Parrish, S. V. Petelina, C. Piccolo, J.-P. Pommereau, C. E. Randall, C. Robert, C. Roth, M. Schneider, C. Senten, T. Steck, A. Strandberg, K. B. Strawbridge, R. Sussmann, D. P. J. Swart, D. W. Tarasick, J. R. Taylor, C. Tétard, L. W. Thomason, A. M. Thompson, M. B. Tully, J. Urban, F. Vanhellemont, T. von Clarmann, P. von der Gathen, C. von Savigny, J. W. Waters, J. C. Witte, M. Wolff, and J. M. Zawodny; Atmos. Chem. Phys., 9, 287-343, 2009; Available at the ACP web site.; Evaluation of ECMWF ERA-40 temperature and wind in the lower tropical stratosphere since 1988 from past long-duration balloon measurements; Christensen, T., Knudsen, B. M., Pommereau, J.-P., Letrenne, G., Hertzog, A., Vial, F., Ovarlez, J., Piot, M.; Atmos. Chem. Phys., 7, 3399-3409, 2007; Available at the ACP web site.; An overview of the HIBISCUS campaign; J.-P. Pommereau, A. Garnier, G. Held, A.-M. Gomes, F. Goutail, G. Durry, F. Borchi, A. Hauchecorne, N. Montoux, P. Cocquerez, G. Letrenne, F. Vial, A. Hertzog, B. Legras, I. Pisso, J. A. Pyle, N. R. P. Harris, R. L. Jones, A. Robinson, G. Hansford, L. Eden, T. Gardiner, N. Swann, B. Knudsen, N. Larsen, J. Nielsen, T. Christensen, F. Cairo, M. Pirre, V. Marécal, N. Huret, E. Rivière, H. Coe, D. Grosvenor, K. Edvarsen, G. Di Donfrancesco, P. Ricaud, J.-J. Berthelier, M. Godefroy, E. Seran, K. Longo, S. Freitas; Atmos. Chem. Phys. Discuss., 7, 2389-2475, 2007; Available at the ACP web site.; Accuracy of analyzed temperatures, winds and trajectories in the Southern Hemisphere tropical and midlatitude stratosphere as compared to long-duration balloon flights; Knudsen, B. M., Christensen, T., Hertzog, A., Deme, A., Vial, F., Pommereau, J.-P.; Atmos. Chem. Phys., 6, 5391-5397, 2006; Available at the ACP web site.; Vortex-averaged Arctic ozone depletion in the winter 2002/2003,; Christensen, T. , Knudsen, B. M., Streibel, M., Andersen, S. B., Benesova, A., Braathen, G., Claude, H., Davies, J., De Backer, H., Dier, H., Dorokhov, V., Gerding, M., Gil, M., Henchoz, B., Kelder, H., Kivi, R., Kyrö, E., Litynska, Z., Moore, D., Peters, G., Skrivankova, P., Stübi, R., Turunen, T., Vaughan, G., Viatte, P., Vik, A. F., von der Gathen, P., Zaitcev, I., 2005; Atmospheric Chemistry and Physics, Vol. 5, pp 131-138, 21-1-2005; Available at the ACP web site.; Conjugate High-Intensity Energetic Electron Precipitation at High Latitude,; Christensen, T., Østgaard, N., Rosenberg, T.J., Detrick, D.L., Germany, G.A., Stauning, P., 2003; Annales Geophysicae, 21, 1443-1455; Available as 2.4 MB pdf file.; A Sulphur Abundance Study of NGC 300 By an Empirical Calibration Method,; Christensen, T., Petersen, L., Gammelgaard, P., 1997; Astronomy and Astrophysics, 322, 41; Available as 240 kB pdf file.
Publications in conference proceedings (first-author papers only): Vortex-averaged ozone losses in the winter 2002/2003,; Christensen, T., Knudsen, B. M., Andersen, S. B., Benesova, A., Bojkov, B. R., Claude, H., Davies, J., De Backer, H., Dier, H., Dorokhov, V., Gerding, M., Gil, M., Henchoz, B., Kelder, H., Kivi, R., Kyrö, E., Litynska, Z., Peters, G., Shearman, R. J., Skrivankova, P., Stubi, R., Turunen, T., Vaughan, G., Viatte, P., von der Gathen, P., Zaitzev, I., 2004; Zerefos, C. S. (ed.), Proceedings of the XX Quadrennial Ozone Symposium, 1-8 June 2004, Kos, Greece, pp. 59-60; Available as 60 kB pdf file.; Event Study of High-Energy Electron Precipitation by Comparison of Ørsted Data and Ground-Based Observations,; Christensen, T., Stauning, P., Christiansen, F., Thayer, J., 2000; Neubert, T. and Ultré-Guérard, P. (eds.), Proceedings of Ørsted 3rd International Science Teem Meeting, DMI technical report; Available as 700 kB pdf file.
Reports: Ozonlaget over Danmark og Grønland 1979-2008; Bjarne Christensen, Tina Christensen, Paul Eriksen, Nis Jepsen, Helge Jønch-Sørensen og Niels Larsen, 2009; Danmarks Klimacenter rapport 09-05; Available as pdf file.; Ozonlaget over Danmark og Grønland 1979-2007; Tina Christensen, Paul Eriksen, Helge Jønch-Sørensen og Niels Larsen, 2008; Danmarks Klimacenter rapport 08-02; Available as pdf file.; UV-stråling i Grønland; Tina Christensen, Helge Jønch-Sørensen, Paul Eriksen, Bjørn Knudsen og Signe B. Andersen, 2007; DMI Scientific Report 07-05; Available as pdf file.; Ozonlaget over Danmark og Grønland 1979-2006; Signe B. Andersen, Tina Christensen, Paul Eriksen, Bjørn Knudsen og Niels Larsen, 2007; Danmarks Klimacenter rapport 07-01; Available as pdf file.; Ozonlaget over Danmark og Grønland 1979-2005; Signe B. Andersen, Tina Christensen, Paul Eriksen, Bjørn Knudsen og Niels Larsen, 2006; Danmarks Klimacenter rapport 06-01; Available as pdf file.; Ozonlaget over Danmark og Grønland 2004; Signe B. Andersen, Tina Christensen, Paul Eriksen, Bjørn Knudsen og Niels Larsen, 2005; Danmarks Klimacenter rapport 05-04; Available as pdf file.
Theses: Energetic Electron Precipitation Studied by Atmospheric X-rays; Tina Christensen, September 2002; Ph.D. Thesis, Faculty of Science, Copenhagen University; Available as 5.5 MB pdf file.; Empirical Sulphur Abundance Determination from Optical and Near-IR Spectrophotometry of H II Regions in Spiral Galaxies; Tina Christensen, May 1997; Master's Thesis, Institute of Physics and Astronomy, University of Aarhus, Denmark; Available as 1.3 MB pdf file. Seperate frontpage in 260 kB pdf file.
Popular science papers: Ballonstudier af tropiske tordenskyer; Tina Christensen, 2009; Vejret, 118, februar 2009; Arktisk ozonnedbrydning; Signe Bech Andersen, Synne Høyer Svendsen og Tina Christensen, 2007; Kvant, marts 2007

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Last update June 23rd 2009
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