Haumann F. Alexander

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F. Alexander

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  • Article
    Supercooled Southern Ocean waters
    (American Geophysical Union, 2020-10-09) Haumann, F. Alexander ; Moorman, Ruth ; Riser, Stephen C. ; Smedsrud, Lars H. ; Maksym, Ted ; Wong, Annie P. S. ; Wilson, Earle A. ; Drucker, Robert S. ; Talley, Lynne D. ; Johnson, Kenneth S. ; Key, Robert M. ; Sarmiento, Jorge L.
    In cold polar waters, temperatures sometimes drop below the freezing point, a process referred to as supercooling. However, observational challenges in polar regions limit our understanding of the spatial and temporal extent of this phenomenon. We here provide observational evidence that supercooled waters are much more widespread in the seasonally ice‐covered Southern Ocean than previously reported. In 5.8% of all analyzed hydrographic profiles south of 55°S, we find temperatures below the surface freezing point (“potential” supercooling), and half of these have temperatures below the local freezing point (“in situ” supercooling). Their occurrence doubles when neglecting measurement uncertainties. We attribute deep coastal‐ocean supercooling to melting of Antarctic ice shelves and surface‐induced supercooling in the seasonal sea‐ice region to wintertime sea‐ice formation. The latter supercooling type can extend down to the permanent pycnocline due to convective sinking plumes—an important mechanism for vertical tracer transport and water‐mass structure in the polar ocean.
  • Article
    Polar fresh water in a changing global climate: linking Arctic and Southern Ocean processes
    (Oceanography Society, 2023-05-01) Rabe, Benjamin ; Martin, Torge ; Solomon, Amy ; Assmann, Karen M. ; Biddle, Louise C. ; Haine, Thomas ; Hattermann, Tore ; Haumann, F. Alexander ; Jahn, Alexandra ; Karpouzoglou, Theodoros ; Laukert, Georgi ; Garabato, Alberto Naveira ; Rosenblum, Erica ; Sikes, Elisabeth ; Yin, Liping ; Zhang, Xiangdong
    NORP-SORP Workshop on Polar Fresh Water: Sources, Pathways and Impacts of Freshwater in Northern and Southern Polar Oceans and Seas (SPICE-UP)What: Up to 60 participants at a time and more than twice as many registrants in total from 20 nations and across experience levels met to discuss the current status of research on freshwater in both polar regions, future directions, and synergies between the Arctic and Southern Ocean research communitiesWhen: 19-21 September 2022 Where: Online