– Niels Bohr Institute - University of Copenhagen

Helle Astrid Kjær

Helle Astrid Kjær

Assistant professor


  1. 2018
  2. Published

    The Ross Sea Dipole - temperature, snow accumulation and sea ice variability in the Ross Sea region, Antarctica, over the past 2700 years. / Bertler, Nancy A. N.; Conway, Howard; Dahl-Jensen, Dorthe; Emanuelsson, Daniel B.; Winstrup, Mai; Vallelonga, Paul T.; Lee, James E.; Brook, Ed J.; Severinghaus, Jeffrey P.; Fudge, Taylor J.; Keller, Elizabeth D.; Baisden, W. Troy; Hindmarsh, Richard C. A.; Neff, Peter D.; Blunier, Thomas; Edwards, Ross; Mayewski, Paul A.; Kipfstuhl, Sepp; Buizert, Christo; Canessa, Silvia; Dadic, Ruzica; Kjaer, Helle A.; Kurbatov, Andrei; Zhang, Dongqi; Waddington, Edwin D.; Baccolo, Giovanni; Beers, Thomas; Brightley, Hannah J.; Carter, Lionel; Clemens-Sewall, David; Ciobanu, Viorela G.; Delmonte, Barbara; Eling, Lukas; Ellis, Aja; Ganesh, Shruthi; Golledge, Nicholas R.; Haines, Skylar; Handley, Michael; Hawley, Robert L.; Hogan, Chad M.; Johnson, Katelyn M.; Korotkikh, Elena; Lowry, Daniel P.; Mandeno, Darcy; McKay, Robert M.; Menking, James A.; Naish, Timothy R.; Noerling, Caroline; Simonsen, Marius; Wang, Shimeng.

    In: Climate of the Past, Vol. 14, No. 2, 21.02.2018, p. 193-214.

    Research output: Contribution to journalJournal articleResearchpeer-review

  3. Published

    Rapid increase in atmospheric iodine levels in the North Atlantic since the mid-20th century. / Cuevas, Carlos A.; Maffezzoli, Niccolo; Corella, Juan Pablo; Spolaor, Andrea; Vallelonga, Paul Travis; Kjær, Helle Astrid; Simonsen, Marius Folden; Winstrup, Mai; Vinther, Bo Møllesøe; Horvat, Christopher; Fernandez, Rafael P.; Kinnison, Douglas; Lamarque, Jean-Francois; Barbante, Carlo; Saiz-Lopez, Alfonso.

    In: Nature Communications, Vol. 9, 1452, 13.04.2018.

    Research output: Contribution to journalJournal articleResearchpeer-review

  4. Published

    Organic phosphorus in the terrestrial environment : a perspective on the state of the art and future priorities (vol 427, pg 191, 2018). / George, T. S.; Giles, C. D.; Menezes-Blackburn, D.; Condron, L. M.; Gama-Rodrigues, A. C.; Jaisi, D.; Lang, F.; Neal, A. L.; Stutter, M. I.; Almeida, D. S.; Bol, R.; Cabugao, K. G.; Celi, L.; Cotner, J. B.; Krueger, J.; Plassard, C.; Rosling, A.; Darch, T.; Fraser, T.; Tamburini, F.; Audette, Y.; Bertrand, I.; Beyhaut, E.; Boitt, G.; Bradshaw, N.; Brearley, C. A.; Bruulsema, T. W.; Cozzolino, V.; Duran, P. C.; Mora, M. L.; de Menezes, A. B.; Dodd, R. J.; Dunfield, K.; Engl, C.; Frazao, J. J.; Jimenez, J. L. Gonzalez; Harrison, A. F.; Hou, E. Q.; Johnes, P. J.; Kaiser, K.; Kjaer, H. A.; Klumpp, E.; Lamb, A. L.; Macintosh, K. A.; Nelson, L. A.; Tibbett, M.; Wallander, H.; Wang, L.; Wasaki, J.; Haygarth, P. M.

    In: Plant and Soil, Vol. 427, No. 1-2, SI, 06.2018, p. 209-211.

    Research output: Contribution to journalJournal articleResearchpeer-review

  5. Published

    Laboratory supervision of MSc projects -Qualitative interviews, thematic analysis, and recommendations for the supervisor. / Kjær, Helle Astrid.

    Improving University Science Teaching and Learning Pedagogical Projects 2018. Vol. 12 Institut for Naturfagenes Didaktik. ed. København, Danmark : Københavns Universitet, 2018. p. 91-105.

    Research output: Chapter in Book/Report/Conference proceedingBook chapterEducation

  6. Published

    A novel approach to process brittle ice for continuous flow analysis of stable water isotopes. / Pyne, Rebecca L.; Keller, Elizabith D.; Canessa, Silvia; Bertler, Nancy A.; Pyne, Alex R.; Pyne, Alex R.; Mandeno, Darcy; Vallelonga, Paul Travis; Semper, Stefanie; Kjær, Helle Astrid; Hutchison, Ed; Baisden, W. Troy.

    In: Journal of Glaciology, Vol. 64, No. 243, 16.03.2018, p. 1-11.

    Research output: Contribution to journalJournal articleResearchpeer-review

  7. Published

    Greenland records of aerosol source and atmospheric lifetime changes from the Eemian to the Holocene. / Schupbach, S.; Fischer, H.; Bigler, M.; Erhardt, T.; Gfeller, G.; Leuenberger, D.; Mini, O.; Mulvaney, R.; Abram, N. J.; Fleet, L.; Frey, M. M.; Thomas, E.; Svensson, A.; Dahl-Jensen, D.; Kettner, E.; Kjaer, H.; Seierstad, I.; Steffensen, J. P.; Rasmussen, S. O.; Vallelonga, P.; Winstrup, M.; Wegner, A.; Twarloh, B.; Wolff, K.; Schmidt, K.; Goto-Azuma, K.; Kuramoto, T.; Hirabayashi, M.; Uetake, J.; Zheng, J.; Bourgeois, J.; Fisher, D.; Zhiheng, D.; Xiao, C.; Legrand, M.; Spolaor, A.; Gabrieli, J.; Barbante, C.; Kang, J. -H.; Hur, S. D.; Hong, S. B.; Hwang, H. J.; Hong, S.; Hansson, M.; Iizuka, Y.; Oyabu, I.; Muscheler, R.; Adolphi, F.; Maselli, O.; McConnell, J.

    In: Nature Communications, Vol. 9, 1476, 16.04.2018.

    Research output: Contribution to journalJournal articleResearchpeer-review

  8. Published

    Particle shape accounts for instrumental discrepancy in ice core dust size distributions. / Simonsen, Marius Folden; Cremonesi, Llorenc; Baccolo, Giovanni; Bosch, Samuel; Delmonte, Barbara; Erhardt, Tobias; Kjaer, Helle Astrid; Potenza, Marco; Svensson, Anders; Vallelonga, Paul.

    In: Climate of the Past, Vol. 14, No. 5, 03.05.2018, p. 601-608.

    Research output: Contribution to journalJournal articleResearchpeer-review

  9. Published

    Afslørende kemi i Grønlands og Antarktis' iskerner. / Svensson, Anders; Kjær, Helle Astrid.

    In: Dansk Kemi, Vol. 9, 01.06.2018, p. 18-21.

    Research output: Contribution to journalJournal articleResearchpeer-review

  10. 2017
  11. Published

    Correction to : Organic phosphorus in the terrestrial environment: a perspective on the state of the art and future priorities. / George, Timothy S.; Giles, C.D.; Menezes-Blackburn, D.; Condron, L. M.; Gama-Rodrigues, A.C.; Jaisi, D.; Lang, Friederike; Neal, A.L.; Stutter, M.I.; Almeida, Daniela; Bol, Roland; Cabugao, K.G.; Celi, L.; Cotner, J.B.; Feng, Guoyin; Goll, D.S.; Hallama, M.; Kjær, Helle Astrid.

    In: Plant and Soil, Vol. 427, 02.12.2017, p. 191-202.

    Research output: Contribution to journalJournal articleResearchpeer-review

  12. 2016
  13. Published

    A High-Resolution Continuous Flow Analysis System for Polar Ice Cores. / Dallmayr, Remi; Goto-Azuma, Kumiko; Kjær, Helle Astrid; Azuma, Nobuhiko; Takata, Morimasa; Schüpbach, Simon; Hirabayashi, Motohiro.

    In: Bulletin of Glaciological Research, Vol. 34, 2016, p. 11-20.

    Research output: Contribution to journalJournal articleResearchpeer-review

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