Shear and stability at the base of the mixed layer in the Arctic Ocean the role of inertial motions
Suh, George Y.
MetadataShow full item record
The Arctic environment changed significantly over recent decades and declines in perennial sea ice and thickness concentrations have been frequently observed. Current predictive models providing researchers with conservative estimates of sea ice concentrations, the lack of observations and understanding of the physical processes that promote changes in sea ice create inaccuracies that need to be improved. A fusion of buoy observations, satellite derived ice concentrations, and modeled wind data are made in this thesis to provide a better insight into sea ice inertial motions and its influence on the processes that occur in the Arctic Ocean mixed layer and to investigate whether these processes can be parameterized to improve predictive models. Observations made in the Canadian Basin and the Transpolar Drift by high resolution Autonomous Ocean Flux Buoys (AOFBs), SSMI and AMSR-E satellite derived ice concentrations, and ERA-Interim winds are used to examine the relationships between winds, ice coverage and sea ice inertial oscillations. Data collected from AOFBs and collocated Ice-Tethered Profilers (ITPs) are analyzed to investigate whether ocean mixed layer inertial oscillations contribute to shear instability at the base of the mixed layer, which serves as a mechanism for vertical transport of heat in water masses underlying the mixed layer. Results show that simple linear regression models cannot explain the relationship between inertial sea ice velocities and modeled winds. However, they do indicate that the magnitude of the inertial sea ice velocities during summers is greater when compared to winter. Analysis further reveals a relationship between sea ice inertial oscillations and sea ice concentrations. We conclude that parameterizing the conditions that permit significant inertial motions in terms of changing areal ice conditions is viable. Inertial oscillations generated in the Arctic Ocean mixed layer do contribute significantly to the instability at the base of the mixed layer, especially during summers. However, comparisons of dynamic instability at the base of the mixed layer to satellite derived sea ice concentrations reveal no conclusive relationship.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Taylor, Patrick; Maslowski, Wieslaw; Perlwitz, Judith; Wuebbles, Donald (2017);1. Annual average near-surface air temperatures across Alaska and the Arctic have increased over the last 50 years at a rate more than twice as fast as the global average temperature. (Very high confidence) 2. Rising ...
Cole, Sylvia T.; Toole, John M.; Lele, Ratnaksha; Timmermans, Mary-Louise; Gallaher, Shawn G.; Stanton, Timothy P.; Shaw, William J.; Hwang‖, Byongjun; Maksym, Ted; Wilkinson, Jeremy P.; Ortiz, Macarena; Graber, Hans; Rainville††, Luc; Petty, Alek A.; Farrell, Sinéad L.; Richter-Menge, Jackie A.; Haas, Christian (Elementa, 2017);The interplay between sea ice concentration, sea ice roughness, ocean stratification, and momentum transfer to the ice and ocean is subject to seasonal and decadal variations that are crucial to understanding the present ...
Evaluation of Under Sea-ice Phytoplankton Blooms in the Fully-Coupled, High-Resolution Regional Arctic System Model Frants, Marina; Maslowski, Wieslaw; Osinski, Robert; Jeffery, Nicole; Jin, Meibing; Kinney, Jaclyn Clement (essoar.org, 2020);In July 2011, observations of a massive phytoplankton bloom in the ice-covered waters of the western Chukchi Sea raised questions about the extent and frequency of under seaice blooms and their contribution to the carbon ...