Response of Total and Eddy Kinetic Energy to the recent spin up of the Beaufort Gyre

• Published in: Journal of Physical Oceanography
• Main Authors: Regan, Heather, Lique, Camille, Talandier, Claude, Meneghello, Gianluca
• Other Authors: Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), ANR-18-CE01-0010,ImMEDIAT,Interactions entre la dynamique mésoéchelle et la glace de mer en Arctic(2018)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2020
• Subjects: [SDU]Sciences of the Universe [physics]; Arctic; Arctic Ocean; Sea ice
• Online Access: https://hal.science/hal-04202478; https://hal.science/hal-04202478/document; https://hal.science/hal-04202478/file/phoc-jpo-d-19-0234.1.pdf; https://doi.org/10.1175/JPO-D-19-0234.1

International audience The Beaufort Gyre in the Arctic Ocean has spun up over the past two decades in response to changes of the wind forcing and sea ice conditions, accumulating a significant amount of freshwater. Here a simulation performed with a high-resolution, eddy resolving model is analyzed in order to provide a detailed description of the total and eddy kinetic energy, and their response to this spin up of the gyre. On average, and in contrast to the typical open ocean conditions, the levels of mean and eddy kinetic energy are of the same order of magnitude, and the eddy kinetic energy is only intensified along the boundary and in the subsurface. In response to the strong anomalous atmospheric conditions in 2007, the gyre spins up and the mean kinetic energy almost doubles, while the eddy kinetic energy does not increase significantly for a long time period. This is because the isopycnals are able to flatten and the gyre expands outwards, reducing the potential for baroclinic instability. These results have implications for understanding the mechanisms at play for equilibrating the Beaufort Gyre and the variability and future changes of the Arctic freshwater system.