Description
Presentations on Roadmap for future AMOC observing
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Katy Hill (NOC)19/07/2023, 09:10Talk
In the early 2000s while we were building the sustained observing system (out of WOCE and TOGA), the global community was focused on filling in the dots on the map. Once we had a basic global ocean observing system the focus had had to become more nuanced of augmenting, reviewing and evolving the observing system, while there is a continued need to provide guidance on priorities for...
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Thomas Haine (Earth & Planetary Sciences, Johns Hopkins University)19/07/2023, 09:25Roadmap for futureTalk
Progress in information technology has driven exponential growth in the number of global ocean observations and the fidelity of numerical simulations of the ocean in the past few decades. The growth has been exponentially faster for ocean simulations, however. The present cutting-edge ocean circulation models running on the latest supercomputers can cover the globe with resolutions of a few...
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Eric Chassignet (Florida State University)19/07/2023, 09:40Roadmap for futureTalk
Nature runs are state-of-the-art numerical simulations that are as close as possible to reality that can be used as reference for design of observational arrays and/or data assimilation. We will review the current status of basin-scale to global-scale AMOC modeling and define the minimum requirements that a numerical model should be able to reproduce (mean transport and water mass...
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Yao Fu (Georgia Institute of Technology)19/07/2023, 09:55Roadmap for futureTalk
The Overturning in the Subpolar North Atlantic Program (OSNAP) array, consisting of an OSNAP West section covering the Labrador Sea and an OSNAP East section covering the Irminger and Iceland basins, has continuously observed the MOC and meridional heat and freshwater transports (MHT and MFT, respectively) since 2014. The OSNAP observations have contributed substantially to the understanding...
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Shane Elipot19/07/2023, 10:10Roadmap for futureTalk
Based on geostrophy, the zonally-integrated mass transport at a given depth is simply the difference between the pressure on the boundaries at that depth. Thus, to measure the overturning streamfunction, in depth space, only measurements of pressure are theoretically required. Presently, only high-frequency pressure anomalies can be reliably measured directly at constant depth in the ocean....
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Dr Gerard McCarthy (Maynooth University)19/07/2023, 10:25Roadmap for futureTalk
The Atlantic Meridional Overturning Circulation, a crucial element of the Earths’ climate system, is projected to weaken over the course of the 21st Century which could have far reaching consequences for the occurrence of extreme weather events, sea level rise, monsoon regions and the marine ecosystem. The latest IPCC puts the likelihood of such a weakening as “very likely”. As our confidence...
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Patrick Heimbach (University of Texas at Austin, USA)19/07/2023, 11:15Roadmap for futureTalk
The North Atlantic Ocean circulation is the result of a range of physical processes, from large-scale gyre circulation (subtropical and subpolar), associated Ekman transports, fluctuations of the gyre boundaries, westward intensification that gives rise to the Gulf Stream, watermass transformation at high latitudes along continental boundaries and in the interior, complex ("return") flows at...
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Jörg Fröhle (GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel)19/07/2023, 11:30Roadmap for futureTalk
The subpolar North Atlantic plays an important role in connecting the upper and the lower branches of the Atlantic Meridional Overturning Circulation. The Labrador Sea is part of this system. By means of repeat hydrographic sections and a mooring array, the Deep Western Boundary Current (DWBC) system is measured at the southern exit of the Labrador Sea with help of the 53°N Observatory since...
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Simon Wett (Institute of Environmental Physics, University of Bremen)19/07/2023, 11:45Roadmap for futureTalk
The Atlantic Meridional Overturning Circulation (AMOC) plays a vital role in the climate system of Europe and the Arctic by redistributing heat and freshwater in the Atlantic. Since climate model studies project a decline of the AMOC in the 21st century, monitoring AMOC changes remains essential. While on longer than decadal timescales AMOC variability is expected to be coherent across...
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Daniel Whitt (NASA Ames)19/07/2023, 12:00Roadmap for futureTalk
This presentation will be a tale of two perspectives that come together to inform AMOC observing needs in a changing climate. First, I will share some results from NASA’s gravity and altimetry satellite science teams that highlight how these NASA assets contribute to monitoring and understanding AMOC. Second, I will present highlights from my own analysis of future Earth system simulations, in...
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Helen Pillar (The University of Texas at Austin, USA)19/07/2023, 12:15Roadmap for futureTalk
A large ensemble of adjoint-based sensitivity experiments within the Arctic and Subpolar gyre sTate Estimate (ASTE) is used to interrogate the constraint provided by continuous monitoring at the Overturning in the Subpolar North Atlantic Program (OSNAP) array. Each ensemble member is designed to expose ocean adjustments impacting the hydrography sampled at an individual mooring within the...
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