Helle Astrid Kjær

Helle Astrid Kjær

Assistant professor


  1. 2020
  2. Published

    Bipolar volcanic synchronization of abrupt climate change in Greenland and Antarctic ice cores during the last glacial period

    Svensson, Anders, Dahl-Jensen, Dorthe, Steffensen, Jørgen Peder, Blunier, Thomas, Rasmussen, Sune Olander, Vinther, Bo Møllesøe, Vallelonga, P. T., Capron, E., Gkinis, Vasileios, Cook, Eliza, Kjær, Helle Astrid, Muscheler, R., Kipfstuhl, S., Wilhelms, F., Stocker, T. F., Fischer, H., Adolphi, F., Erhardt, T., Sigl, M., Landais, A., Parrenin, F., Buizert, C., McConnell, J. R., Severi, M., Mulvaney, R. & Bigler, M., 19 Aug 2020, In : Climate of the Past. 16, p. 1565-1580 15 p.

    Research output: Contribution to journalJournal articleResearchpeer-review

  3. Published

    Past perspectives on the present era of abrupt Arctic climate change

    Jansen, E., Christensen, Jens Hesselbjerg, Dokken, T., Nisancioglu, K. H., Vinther, Bo Møllesøe, Capron, E., Guo, C., Jensen, M. F., Langen, P. L., Pedersen, R. A., Yang, S., Bentsen, M., Kjær, Helle Astrid, Sadatzki, H., Sessford, E. & Stendel, M., 1 Aug 2020, In : Nature climate change. 10, 8, p. 714-721 8 p.

    Research output: Contribution to journalJournal articleResearchpeer-review

  4. 2019
  5. Published

    A 120 000-year record of sea ice in the North Atlantic?

    Maffezzoli, N., Vallelonga, P., Edwards, R., Saiz-Lopez, A., Turetta, C., Kjær, Helle Astrid, Barbante, C., Vinther, Bo Møllesøe & Spolaor, A., 19 Dec 2019, In : Climate of the Past. 15, 6, p. 2031-2051

    Research output: Contribution to journalJournal articleResearchpeer-review

  6. Published

    Holocene atmospheric iodine evolution over the North Atlantic

    Corella, J. P., Maffezzoli, N., Cuevas, C. A., Vallelonga, P., Spolaor, A., Cozzi, G., Muller, J., Vinther, Bo Møllesøe, Barbante, C., Kjær, Helle Astrid, Edwards, R. & Saiz-Lopez, A., 18 Dec 2019, In : Climate of the Past. 15, 6, p. 2019-2030

    Research output: Contribution to journalJournal articleResearchpeer-review

  7. Published

    East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat.

    Simonsen, M. F., Baccolo, G., Blunier, Thomas, Borunda, A., Delmonte, B., Frei, R., Goldstein, S., Grinsted, Aslak, Kjær, Helle Astrid, Sowers, T. A., Svensson, Anders, Vinther, Bo Møllesøe, Vladimirova, D., Winckler, G., Winstrup, M. & Vallelonga, P. T., 3 Oct 2019, In : Nature Communications. 10, 8 p., 4494.

    Research output: Contribution to journalJournal articleResearchpeer-review

  8. Published

    A 2700-year annual timescale and accumulation history for an ice core from Roosevelt Island, West Antarctica

    Winstrup, M., Vallelonga, P., Kjær, Helle Astrid, Fudge, T. J., Lee, J. E., Riis, M. H., Edwards, R., Bertler, N. A. N., Blunier, Thomas, Brook, E. J., Buizert, C., Ciobanu, G., Conway, H., Dahl-Jensen, Dorthe, Ellis, A., Emanuelsson, B. D., Hindmarsh, R. C. A., Keller, E. D., Kurbatov, A. V., Mayewski, P. A., Neff, P. D., Pyne, R. L., Simonsen, M. F., Svensson, Anders, Tuohy, A., Waddington, E. D. & Wheatley, S., 10 Apr 2019, In : Climate of the Past. 15, 2, p. 751-779 29 p.

    Research output: Contribution to journalJournal articleResearchpeer-review

  9. 2018
  10. Published

    Afslørende kemi i Grønlands og Antarktis' iskerner

    Svensson, Anders & Kjær, Helle Astrid, 1 Jun 2018, In : Dansk Kemi. 9, p. 18-21 3 p.

    Research output: Contribution to journalJournal articleResearchpeer-review

  11. 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. G., Harrison, A. F., Hou, E. Q., Johnes, P. J., Kaiser, K., Kjær, Helle Astrid, Klumpp, E., Lamb, A. L., Macintosh, K. A., Nelson, L. A., Tibbett, M., Wallander, H., Wang, L., Wasaki, J. & Haygarth, P. M., Jun 2018, In : Plant and Soil. 427, 1-2, SI, p. 209-211

    Research output: Contribution to journalJournal articleResearchpeer-review

  12. Published

    Particle shape accounts for instrumental discrepancy in ice core dust size distributions

    Simonsen, M. F., Cremonesi, L., Baccolo, G., Bosch, S., Delmonte, B., Erhardt, T., Kjær, Helle Astrid, Potenza, M., Svensson, Anders & Vallelonga, P., 3 May 2018, In : Climate of the Past. 14, 5, p. 601-608

    Research output: Contribution to journalJournal articleResearchpeer-review

  13. 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, Anders, Dahl-Jensen, Dorthe, Kettner, E., Kjær, Helle Astrid, Seierstad, I., Steffensen, Jørgen Peder, Rasmussen, Sune Olander, 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. -., 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., 16 Apr 2018, In : Nature Communications. 9, 1476.

    Research output: Contribution to journalJournal articleResearchpeer-review

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ID: 33355865