Helle Astrid Kjær

Helle Astrid Kjær

Assistant professor


  1. 2009
  2. Assessment of the temperature, precipitation and snow in the RCM HIRHAM4 at 25 km resolution : Danish Climate Centre Report 09-08. / Kjær, Helle Astrid.

    Assessment of the temperature, precipitation and snow in the RCM HIRHAM4 at 25 km resolution: Danish Climate Centre Report 09-08. Danmarks Meterologiske Institut (DMI), 2009.

    Research output: Chapter in Book/Report/Conference proceedingReport chapterResearch

  3. 2011
  4. Published

    Iskerner-et indblik i fortidens klimaforandringer. / Kjær, Helle Astrid; Balslev-Clausen, David.

    Aspekter af dansk kemi i det 20. og 21. århundrede. 1. ed. København : Kemi Forlaget, 2011. p. 65-70.

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

  5. 2012
  6. Published

    Duration of Greenland Stadial 22 and ice-gas Δage from counting of annual layers in Greenland NGRIP ice core. / Vallelonga, Paul Travis; Bertagna, G.; Blunier, Thomas; Kjær, Helle Astrid; Popp, Trevor James; Rasmussen, Sune Olander; Steffensen, Jørgen Peder; Stowasser, Christopher; Svensson, Anders; Warming, E.; Winstrup, Mai; Bigler, Matthias; Kipfstuhl, S.

    In: Climate of the Past, Vol. 8, No. 6, 20.11.2012, p. 1839-1847.

    Research output: Contribution to journalJournal articleResearchpeer-review

  7. 2013
  8. Published

    Eemian interglacial reconstructed from a Greenland folded ice core. / Dahl-Jensen, Dorthe; Albert, M. R.; Aldahan, A.; Azuma, N.; Balslev-Clausen, David Morten; Baumgartner, M.; Berggren, A.-M.; Bigler, M.; Binder, Thomas; Blunier, Thomas; Bourgeois, J.C.; Brook, E.J.; Buchardt, Susanne Lilja; Buizert, Christo; Capron, E.; Chappellaz, J.; Chung, J.; Clausen, Henrik Brink; Cvijanovic, Ivana; Davies, S.M.; Ditlevsen, Peter; Eicher, O.; Fischer, H.; Fisher, D. A.; Fleet, L.G.; Gfeller, G.; Gkinis, Vasileios; Gogineni, S.; Goto-Azuma, K.; Grinsted, Aslak; Gudlaugsdottir, H.; Guillevic, Myriam; Hansen, S. B.; Hansson, M.; Hirabayashi, M.; Hong, S.; Hur, S.D.; Huybrechts, P.; Hvidberg, Christine Schøtt; Iizuka, Y.; Jenk, Theo Manuel; Johnsen, Sigfus Johann; Jones, T.R.; Jouzel, J.; Karlsson, Nanna Bjørnholt; Kawamura, K.; Keegan, K.; Kettner, Ernesto; Kipfstuhl, S.; Kjær, Helle Astrid; Koutnik, M.; Kuramoto, T.; Köhler, P.; Laepple, T.; Landais, A.; Langen, Peter Lang; Larsen, Lars Berg; Leuenberger, D.; Leuenberger, M.; Leuschen, C.; Li, J.; Lipenkov, V.; Martinerie, P.; Maselli, O. J.; Masson-Delmotte, V.; McConnell, J. R.; Miller, H.; Mini, O.; Miyamoto, A.; Montagnat-Rentier, M.; Mulvaney, R.; Muscheler, R.; Orsi, A.J.; Paden, J.; Panton, Christian; Pattyn, F.; Petit, J.-R.; Pol, K.; Popp, Trevor James; Possnert, G.; Prié, F.; Prokopiou, M.; Quiquet, A.; Rasmussen, Sune Olander; Raynaud, D.; Ren, J.; Reutenauer, Corentin; Ritz, C.; Röckmann, T.; Rosen, J.L.; Rubino, Mauro; Rybak, O.; Samyn, D.; Sapart, C.J.; Schilt, A.; Schmidt, Astrid Mariah Zelma; Schwander, J.; Schüpbach, S.; Seierstad, Inger Kathrine; Severinghaus, J. P.; Sheldon, S.; Simonsen, Sebastian Bjerregaard; Sjolte, Jesper; Solgaard, Anne Munck; Sowers, T.; Sperlich, Peter; Steen-Larsen, Hans Christian; Steffen, K.; Steffensen, Jørgen Peder; Steinhage, D.; Stocker, T.F.; Stowasser, Christopher; Sturevik, A.S.; Sturges, W.T.; Sveinbjörnsdottir, A.; Svensson, Anders; Tison, J.-L.; Uetake, J.; Vallelonga, Paul Travis; Van De Wal, R.S.W.; Van Der Wel, G.; Vaughn, B.H.; Vinther, Bo Møllesøe; Waddington, E.; Wegner, A.; Weikusat, I.; White, J. W. C.; Wilhelms, F.; Winstrup, Mai; Witrant, E.; Wolff, E.W.; Xiao, C.; Zheng, Jin.

    In: Nature, Vol. 493, No. 7433, 24.01.2013, p. 489-494.

    Research output: Contribution to journalJournal articleResearchpeer-review

  9. Published

    Continuous Flow Analysis Method for Determination of Dissolved Reactive Phosphorus in Ice Cores. / Kjær, Helle Astrid; Vallelonga, Paul Travis; Svensson, Anders; Elleskov L. Kristensen, Magnus; Tibuleac, Catalin; Bigler, Matthias.

    In: Environmental Science & Technology (Washington), Vol. 47, No. 21, 05.11.2013, p. 12325-12332.

    Research output: Contribution to journalJournal articleResearchpeer-review

  10. 2014
  11. Published

    Continuous Chemistry in Ice Cores : Phosphorus, pH and the Photolysis of Humic Like Substances. / Kjær, Helle Astrid.

    The Niels Bohr Institute, Faculty of Science, University of Copenhagen, 2014.

    Research output: Book/ReportPh.D. thesisResearch

  12. Published

    Determination of 129I in Arctic snow by a novel analytical approach using IC-ICP-SFMS. / Ezerinskis, Zilvinas; Spolaor, Andrea; Kirchgeorg, Torben; Cozzi, Giulio; Vallelonga, Paul; Kjaer, Helle A.; Sapolaite, Justina; Barbante, Carlo; Druteikiene, Ruta.

    In: Journal of Analytical Atomic Spectrometry, Vol. 29, No. 10, 10.01.2014, p. 1827-1834.

    Research output: Contribution to journalJournal articleResearchpeer-review

  13. Published

    Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS). / Vallelonga, Paul Travis; Christianson, K.; Alley, R.B.; Anandakrishnan, S.; Dahl-Jensen, Dorthe; Gkinis, Vasileios; Holme, Christian Terkelsen; Jacobel, R.w.; Karlsson, Nanna Bjørnholt; Keisling, B.A.; Kipfstuhl, S.; Kjær, Helle Astrid; Kristensen, Magnus Elleskov; Muto, A.; Peters, L.E.; Popp, Trevor James; Riverman, K.L.; Svensson, Anders; Tibuleac, Catalin; Vinther, Bo Møllesøe; Weng, Y; Winstrup, Mai.

    In: The Cryosphere Discussions, Vol. 8, 10.01.2014, p. 1275-1287.

    Research output: Contribution to journalJournal articleResearchpeer-review

  14. Published

    Seasonality of halogen deposition in polar snow and ice. / Spolaor, A.; Vallelonga, P.; Gabrieli, J.; Martma, T.; Bjorkman, M. P.; Isaksson, E.; Cozzi, G.; Turetta, C.; Kjaer, H. A.; Curran, M. A. J.; Moy, A. D.; Schoenhardt, A.; Blechschmidt, A. -M.; Burrows, J. P.; Plane, J. M. C.; Barbante, C.

    In: Atmospheric Chemistry and Physics, Vol. 14, No. 18, 10.01.2014, p. 9613-9622.

    Research output: Contribution to journalJournal articleResearchpeer-review

  15. Published

    A novel method for the detection of acidity in ice cores. / Kjær, Helle Astrid; Vallelonga, Paul Travis; Svensson, Anders.

    European Geosciences Union General Assembly 2014, 16, 27 April – 02 May 2014. European Geosciences Union. ed. Vienna, Austria, 2014. 1526.

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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