Abstract's details
Deep-ocean steric sea level variations in the Northwest Atlantic Basin revealed using Deep Argo and Bermuda Atlantic Time-series Study full-depth profiles
CoAuthors
Event: 2023 Ocean Surface Topography Science Team Meeting
Session: Synergies between Argo, GRACE and Altimetry
Presentation type: Type Oral
Contribution: PDF file
Abstract:
Deep-ocean steric sea level variations in the Northwest Atlantic Basin revealed using Deep Argo and Bermuda Atlantic Time-series Study full-depth profiles
Nathalie Zilberman(1), William Llovel(2), Jacob Steinberg(3), and Antoine Hochet(2)
(1) Scripps Institution of Oceanography, UCSD, California
(2) LOPS/CNRS, Brest, France
(3) NOAA GFDL, Princeton, New Jersey
The global mean sea level budget closes between 2005 and 2015 when using a decadal trend in deep-ocean steric change based on historical data but that is no longer the case between 2005 and 2019. While some of the non-closure of the global sea level budget can be explained by limitations of conductivity temperature depth sensors on Argo floats, satellite altimeters, and GRACE/GRACE-FO accelerometers, the lack of homogeneous observations in the deep ocean at regional-to-global and subseasonal-to-interannual scales is thought to play a significant role. Work will be presented that makes use of full-depth ocean temperature and salinity profiles collected between 2017-2023 from five Deep Argo floats deployed in the Northwest Atlantic Basin, and 1983-2023 at the Bermuda Atlantic Time-series Study (BATS) station, to investigate the contribution of the deep ocean to steric sea level change. Sub-seasonal to interannual variations in the vertical structure of steric sea level from the surface to the seafloor will be studied using Deep Argo and BATS data. Comparisons between Deep Argo profiles, mooring time series, and geodetic products based on sea level budget approach, will provide estimates of the “missing” deep-ocean steric component of the sea level budget.
Nathalie Zilberman(1), William Llovel(2), Jacob Steinberg(3), and Antoine Hochet(2)
(1) Scripps Institution of Oceanography, UCSD, California
(2) LOPS/CNRS, Brest, France
(3) NOAA GFDL, Princeton, New Jersey
The global mean sea level budget closes between 2005 and 2015 when using a decadal trend in deep-ocean steric change based on historical data but that is no longer the case between 2005 and 2019. While some of the non-closure of the global sea level budget can be explained by limitations of conductivity temperature depth sensors on Argo floats, satellite altimeters, and GRACE/GRACE-FO accelerometers, the lack of homogeneous observations in the deep ocean at regional-to-global and subseasonal-to-interannual scales is thought to play a significant role. Work will be presented that makes use of full-depth ocean temperature and salinity profiles collected between 2017-2023 from five Deep Argo floats deployed in the Northwest Atlantic Basin, and 1983-2023 at the Bermuda Atlantic Time-series Study (BATS) station, to investigate the contribution of the deep ocean to steric sea level change. Sub-seasonal to interannual variations in the vertical structure of steric sea level from the surface to the seafloor will be studied using Deep Argo and BATS data. Comparisons between Deep Argo profiles, mooring time series, and geodetic products based on sea level budget approach, will provide estimates of the “missing” deep-ocean steric component of the sea level budget.