Impact of Near‐Inertial Waves on Vertical Mixing and Air‐Sea CO2 Fluxes in the Southern Ocean
Name
offlinemixingNIW.pdf
Description
Submitted version
Size
4.42 MB
Format
Adobe PDF
Checksum (MD5)
55aa8530d61d753699cf8438aa00d4a4
Author(s)
Song, Hajoon
Marshall, John C
Campin, Jean-Michel
McGillicuddy, Dennis J. Jr.
Date Issued
June 2019
Journal
Journal of Geophysical Research: Oceans
Publisher
American Geophysical Union (AGU)
Citation
Song, Hajoon et. al., "Impact of Near‐Inertial Waves on Vertical Mixing and Air‐Sea CO2 Fluxes in the Southern Ocean." Journal of Geophysical Research: Oceans 124, 7 (July 2019): 4605-17 doi. 10.1029/2018JC014928 ©2019 Authors
Version
Original manuscript
Abstract
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. ©2019. American Geophysical Union. All Rights Reserved.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Joint Program in Applied Ocean Physics and Engineering
Woods Hole Oceanographic Institution
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2018JC014928
