TY - JOUR
T1 - The Contribution of Submesoscale over Mesoscale Eddy Iron Transport in the Open Southern Ocean
AU - Uchida, Takaya
AU - Balwada, Dhruv
AU - Abernathey, Ryan
AU - McKinley, Galen
AU - Smith, Shafer
AU - Lévy, Marina
N1 - Funding Information:
This research was supported by NASA Award NNX16AJ35G as part of the SWOT Science Team. Abernathey acknowledges additional support from NSF Awards OCE‐1553593 and OCE‐1740648. We thank three anonymous reviewers who have greatly enhanced the readability of our manuscript. The model configuration is available on Github ( doi:10.5281/zenodo.3266400 ) and simulation outputs for 15 daily snapshot and monthly averaged outputs of physical variables( v , θ ,Φ) are available on Pangeo ( doi:10.5281/zenodo.3358021 ). For other variables, please contact the leading author. The World Ocean Atlas data was acquired via https://data.nodc.noaa.gov/thredds/dodsC/woa/WOA13/DATA/ , BSOSE via http://sose.ucsd.edu/bsose_solution_Iter105.html , and SeaWiFS PAR data via https://oceandata.sci.gsfc.nasa.gov/SeaWiFS/Mapped/Daily/9km/par/ . BGC‐Argo data were collected and made freely available by the Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Project funded by the National Science Foundation, Division of Polar Programs (NSF PLR ‐1425989), supplemented by NASA, the Southern Ocean and Climate Field Studies with Innovative Tools (SOCLIM) Project funded by the Foundation BNP Paribas and the Massachusetts Water Resource Authority, and by the International Argo Program and the NOAA programs that contribute to it. ( http://www.argo.ucsd.edu , http://argo.jcommops.org ). CbPM data was acquired via the Oregon State University web portal ( http://orca.science.oregonstate.edu/1080.by.2160.8day.hdf.carbon2.m.php ).
Publisher Copyright:
©2019. The Authors.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Biological productivity in the Southern Ocean is limited by iron availability. Previous studies of iron supply have focused on mixed-layer entrainment and diapycnal fluxes. However, the Southern Ocean is a region highly energetic mesoscale and submesoscale turbulence. Here we investigate the role of eddies in supplying iron to the euphotic zone, using a flat-bottom zonally re-entrant model, configured to represent the Antarctic Circumpolar Current region, that is coupled to a biogeochemical model with a realistic seasonal cycle. Eddies are admitted or suppressed by changing the model's horizontal resolution. We utilize cross spectral analysis and the generalized Omega equation to temporally and spatially decompose the vertical transport attributable to mesoscale and submesoscale motions. Our results suggest that the mesoscale vertical fluxes provide a first-order pathway for transporting iron across the mixing-layer base, where diapycnal mixing is weak, and must be included in modeling the open-Southern Ocean iron budget.
AB - Biological productivity in the Southern Ocean is limited by iron availability. Previous studies of iron supply have focused on mixed-layer entrainment and diapycnal fluxes. However, the Southern Ocean is a region highly energetic mesoscale and submesoscale turbulence. Here we investigate the role of eddies in supplying iron to the euphotic zone, using a flat-bottom zonally re-entrant model, configured to represent the Antarctic Circumpolar Current region, that is coupled to a biogeochemical model with a realistic seasonal cycle. Eddies are admitted or suppressed by changing the model's horizontal resolution. We utilize cross spectral analysis and the generalized Omega equation to temporally and spatially decompose the vertical transport attributable to mesoscale and submesoscale motions. Our results suggest that the mesoscale vertical fluxes provide a first-order pathway for transporting iron across the mixing-layer base, where diapycnal mixing is weak, and must be included in modeling the open-Southern Ocean iron budget.
UR - http://www.scopus.com/inward/record.url?scp=85076355974&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85076355974&partnerID=8YFLogxK
U2 - 10.1029/2019MS001805
DO - 10.1029/2019MS001805
M3 - Article
AN - SCOPUS:85076355974
SN - 1942-2466
VL - 11
SP - 3934
EP - 3958
JO - Journal of Advances in Modeling Earth Systems
JF - Journal of Advances in Modeling Earth Systems
IS - 12
ER -