Helle Astrid Kjær

Helle Astrid Kjær

Assistant professor


  1. 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

  2. Published

    The summer 2012 Greenland heat wave : In situ and remote sensing observations of water vapor isotopic composition during an atmospheric river event. / Bonne, Jean-Louis; Steen-Larsen, Hans Christian; Risi, Camille; Werner, Martin; Sodemann, Harald; Lacour, Jean-Lionel; Fettweis, Xavier; Cesana, Grégory; Delmotte, Marc; Cattani, Olivier; Vallelonga, Paul Travis; Kjær, Helle Astrid; Clerbaux, Cathy; Svienbjörndóttir, Árny Erla; Masson-Delmotte, Valérie.

    In: Journal of Geophysical Research: Earth Surface, Vol. 120, No. 7, 01.04.2015, p. 2970-2989.

    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

    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

  5. 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

  6. 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

  7. Published

    Organic phosphorus in the terrestrial environment : a perspective on the state of the art and future priorities . / 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

  8. 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

  9. Published

    An Optical Dye Method for Continuous Determination of Acidity in Ice Cores. / Kjær, Helle Astrid; Vallelonga, Paul Travis; Svensson, Anders; Kristensen, Magnus Elleskov; Tibuleac, Catalin; Winstrup, Mai; Kipfstuhl, Seep.

    In: Environmental Science & Technology, Vol. 50, No. 19, 01.09.2016, p. 10485-10493.

    Research output: Contribution to journalJournal articleResearchpeer-review

  10. 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

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