Impact of near-inertial waves on vertical mixing and air-sea CO2 fluxes in the Southern Ocean
Marshall, John C.
McGillicuddy, Dennis J.
MetadataShow full item record
We report the significant impact of near‐inertial waves (NIWs) on vertical mixing and air‐sea carbon dioxide (CO2) fluxes in the Southern Ocean using a biogeochemical model coupled to an eddy‐rich ocean circulation model. The effects of high‐frequency processes are quantified by comparing the fully coupled solution (ONLINE) to two offline simulations based on 5‐day‐averaged output of the ONLINE simulation: one that uses vertical mixing archived from the ONLINE model (CTRL) and another in which vertical mixing is recomputed from the 5‐day average hydrodynamic fields (5dAVG). In this latter simulation, processes with temporal variabilities of a few days including NIWs are excluded in the biogeochemical simulation. Suppression of these processes reduces vertical shear and vertical mixing in the upper ocean, leading to decreased supply of carbon‐rich water from below, less CO2 outgassing in austral winter, and more uptake in summer. The net change amounts up to one third of the seasonal variability in Southern Ocean CO2 flux. Our results clearly demonstrate the importance of resolving high‐frequency processes such as NIWs to better estimate the carbon cycle in numerical model simulations.
Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 124(7), (2019): 4605-4617, doi: 10.1029/2018JC014928.
Suggested CitationSong, H., Marshall, J., Campin, J., & McGillicuddy, D. J., Jr. (2019). Impact of near-inertial waves on vertical mixing and air-sea CO2 fluxes in the Southern Ocean. Journal of Geophysical Research-Oceans, 124(7), 4605-4617.
Showing items related by title, author, creator and subject.
Silverthorne, Katherine E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-06)Observational and modeling techniques are employed to investigate the thermal and inertial upper ocean response to wind and buoyancy forcing in the North Atlantic Ocean. First, the seasonal kinetic energy variability of ...
Jochum, Markus; Briegleb, Bruce P.; Danabasoglu, Gokhan; Large, William G.; Norton, Nancy J.; Jayne, Steven R.; Alford, Matthew H.; Bryan, Frank O. (American Meteorological Society, 2013-05-01)The Community Climate System Model, version 4 (CCSM4) is used to assess the climate impact of wind-generated near-inertial waves (NIWs). Even with high-frequency coupling, CCSM4 underestimates the strength of NIWs, so that ...
Rapid injection of near-inertial shear into the stratified upper ocean at an Antarctic Circumpolar Current front Forryan, Alexander; Naveira Garabato, Alberto C.; Polzin, Kurt L.; Waterman, Stephanie N. (John Wiley & Sons, 2015-05-07)The impact on the upper ocean of the passage of a short, intense storm over a Southern Ocean site, in proximity to an Antarctic Circumpolar Current front, is characterized. The storm causes a wind-induced deepening of the ...