Daly, Eoghan and Nolan, Glenn and Berry, Alan and Büscher, Janina V. and Cave, Rachel R. and Caesar, Levke and Cronin, Margot and Fennell, Sheena and Lyons, Kieran and McAleer, Aedín and McCarthy, Gerard and McGovern, Evin and McGovern, Joseph V. and McGrath, Triona and O'Donnell, Garvan and Pereiro, Diego and Thomas, Rob and Vaughan, Louise and White, Martin and Cusack, Caroline (2024) Diurnal to interannual variability in the Northeast Atlantic from hydrographic transects and fixed time-series across the Rockall Trough. Deep Sea Research Part I: Oceanographic Research Papers, 204. p. 104233. ISSN 09670637

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Abstract

The southern entrance to the Rockall Trough is subject to a complex set of dynamic processes, influenced by Atlantic gyre interactions, the North Atlantic Current, slope boundary currents, variable wind stress forcing, mesoscale activity, and a changing supply of modified water masses formed elsewhere in the Atlantic. These processes drive large temporal and spatial variations, and mixing of surface and intermediate water mass properties that advect through the Trough and drive variations in the deeper waters circulating around it. Here, we investigate variability across the southern and central Rockall Trough from standard hydrographic sections (2006–2022) and deepwater moored subsurface measurements, to better understand changes in water column characteristics and water mass modification during advection through the Rockall Trough and track the aftermath of recent freshening events. Rapid and longer-term physical changes are assessed along with spatial variability and watermass interaction. Interannual variability is large across intermediate depths, deeper circulations are regenerated and a salinity core associated with the eastern boundary current is detailed. Establishing, maintaining, monitoring and analysis of observational ocean time-series datasets are a fundamental requirement for managing and conserving crucial biological resources and are key to understanding oceanic and earth system change.

Item Type:	Article
Additional Information:	Scientific surveys were funded under the Marine Institute’s Marine Research Programme by the Irish Government. The authors thank the Working Group on Ocean Hydrography (WGOH) of the International Council for the Exploration of the Sea (ICES) for facilitating this research. We are very grateful for the long-standing dedication, skill, tenacity and enthusiasm of the crew and officers of the Irish research vessels, especially in the face of adverse North Atlantic sea conditions. We also gratefully acknowledge the vessel support received from the Marine Institute RV-Ops team and everyone else who has helped over the years.
Keywords:	Rockall Trough; Northeast Atlantic; Water column variability; Hydrographic time-series; Water mass modification; Boundary currents;
Academic Unit:	Faculty of Social Sciences > Research Institutes > Irish Climate Analysis and Research Units, ICARUS
Item ID:	18204
Identification Number:	https://doi.org/10.1016/j.dsr.2024.104233
Depositing User:	Corinne Voces
Date Deposited:	26 Feb 2024 11:46
Journal or Publication Title:	Deep Sea Research Part I: Oceanographic Research Papers
Publisher:	Science Direct. Elsevier
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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