Biló Tiago C.

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Tiago C.

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  • Article
    Arrival of new great salinity anomaly weakens convection in the Irminger Sea
    (American Geophysical Union, 2022-06-06) Biló, Tiago C. ; Straneo, Fiamma ; Holte, James W. ; Le Bras, Isabela A.
    The Subpolar North Atlantic is prone to recurrent extreme freshening events called Great Salinity Anomalies (GSAs). Here, we combine hydrographic ocean analyses and moored observations to document the arrival, spreading, and impacts of the most recent GSA in the Irminger Sea. This GSA is associated with a rapid freshening of the upper Irminger Sea between 2015 and 2020, culminating in annually averaged salinities as low as the freshest years of the 1990s and possibly since 1960. Upon the GSA propagation into the Irminger Sea over the Reykjanes Ridge, the boundary currents rapidly advected its signal around the basin within months while fresher waters slowly spread and accumulated into the interior. The anomalies in the interior freshened waters produced by deep convection during the 2017–2018 winter and actively contributed to the suppression of deep convection in the following two winters.
  • Article
    Slantwise convection in the Irminger Sea
    (American Geophysical Union, 2022-09-28) Le Bras, Isabela A.‐A. ; Callies, Jörn ; Straneo, Fiammetta ; Biló, Tiago C. ; Holte, James ; Johnson, Helen L.
    The subpolar North Atlantic is a site of significant carbon dioxide, oxygen, and heat exchange with the atmosphere. This exchange, which regulates transient climate change and prevents large‐scale hypoxia throughout the North Atlantic, is thought to be mediated by vertical mixing in the ocean's surface mixed layer. Here we present observational evidence that waters deeper than the conventionally defined mixed layer are affected directly by atmospheric forcing in this region. When northerly winds blow along the Irminger Sea's western boundary current, the Ekman response pushes denser water over lighter water, potentially triggering slantwise convection. We estimate that this down‐front wind forcing is four times stronger than air–sea heat flux buoyancy forcing and can mix waters to several times the conventionally defined mixed layer depth. Slantwise convection is not included in most large‐scale ocean models, which likely limits their ability to accurately represent subpolar water mass transformations and deep ocean ventilation.
  • Article
    Seasonality of the Meridional Overturning Circulation in the subpolar North Atlantic
    (Nature Research, 2023-05-25) Fu, Yao ; Lozier, M Susan ; Biló, Tiago Carrilho ; Bower, Amy S. ; Cunningham, Stuart A. ; Cyr, Frédéric ; de Jong, M. Femke ; deYoung, Brad ; Drysdale, Lewis ; Fraser, Neil ; Fried, Nora ; Furey, Heather H. ; Han, Guoqi ; Handmann, Patricia ; Holliday, N. Penny ; Holte, James ; Inall, Mark E. ; Johns, William E. ; Jones, Sam ; Karstensen, Johannes ; Li, Feili ; Pacini, Astrid ; Pickart, Robert S. ; Rayner, Darren ; Straneo, Fiammetta ; Yashayaev, Igor
    Understanding the variability of the Atlantic Meridional Overturning Circulation is essential for better predictions of our changing climate. Here we present an updated time series (August 2014 to June 2020) from the Overturning in the Subpolar North Atlantic Program. The 6-year time series allows us to observe the seasonality of the subpolar overturning and meridional heat and freshwater transports. The overturning peaks in late spring and reaches a minimum in early winter, with a peak-to-trough range of 9.0 Sv. The overturning seasonal timing can be explained by winter transformation and the export of dense water, modulated by a seasonally varying Ekman transport. Furthermore, over 55% of the total meridional freshwater transport variability can be explained by its seasonality, largely owing to overturning dynamics. Our results provide the first observational analysis of seasonality in the subpolar North Atlantic overturning and highlight its important contribution to the total overturning variability observed to date.
  • Dataset
    Overturning in the Subpolar North Atlantic Program (OSNAP) moored current meter, temperature, conductivity, salinity, and pressure data collected on subsurface moorings M1, M2, M3, and M4 between June 2018 and August 2020
    (Woods Hole Oceanographic Institution, 2023-06-07) Bower, Amy S. ; Straneo, Fiamma ; Furey, Heather H. ; Biló, Tiago C. ; Bahr, Frank B.
    As part of the Overturning in the Subpolar North Atlantic Program (OSNAP), four mooring arrays were deployed in the Greenland Deep Western Boundary Current (GDWBC) located off the east coast of Greenland, in the Irminger Sea. The array consisted of four subsurface moorings M1, M2, M3, and M4, containing 30 MicroCATs and 18 Aquadopp Current Meters, and deployed between June 2018 and August 2020. The data sets are timeseries of temperature, conductivity, pressure, and salinity recorded at 15-minute intervals and current meter data collected at 30-minute intervals. The depths of the moorings were 2086 meters, 2436 meters, 2557 meters, and 2984 meters respectively. The data have been fully processed, calibrated, and quality controlled.