Article
Oceanography
Marine Decuypere, L. Bruno Tremblay, Carolina O. Dufour
Summary: This study investigates the impact of different horizontal resolutions on meridional Ocean Heat Transport (OHT) and sea ice in the Arctic. The results show that OHT and sea ice extent vary with different resolutions and the relationship is non-monotonic. The differences between model configurations mainly arise from the preindustrial state. With increasing spatial resolution, less heat is delivered to the Arctic, and the Medium-resolution configuration is in best agreement with observations.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
William Llovel, Nicolas Kolodziejczyk, Sally Close, Thierry Penduff, Jean-Marc Molines, Laurent Terray
Summary: The global ocean is warming and has absorbed 90% of the Earth Energy Imbalance, resulting in global mean sea level rise. Both ocean heat content and sea level trends show large regional deviations, with uncertainties caused by uneven in-situ observations. Recent research has highlighted the contribution of chaotic ocean variability to regional sea level and ocean heat content trends, suggesting the need to account for this intrinsic variability when assessing decadal-scale budgets.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Anne-Sophie Fortin, Carolina O. Dufour, Timothy M. Merlis, Rym Msadek
Summary: This study investigates the response of the Atlantic meridional overturning circulation (AMOC) to increased atmospheric carbon dioxide (CO2) concentration and identifies the drivers of this response. The research finds that different representations of oceanic processes lead to significant differences in the AMOC response across climate models. The AMOC shows a reduction of similar magnitude in low and high resolutions, while a muted response is found in medium resolution. Changes in the geostrophic and eddy streamfunctions contribute differently to the AMOC decline and there is a weak connection between the deep water formation regions and the Deep Western Boundary Current in the medium resolution.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Navid C. Constantinou, Andrew McC. Hogg
Summary: This study evaluates how the ocean's intrinsic variability leads to patterns of upper-ocean heat content that vary at decadal time scales. These patterns have the potential to feed back on the atmosphere and affect climate modes of variability. Results suggest that moving towards coupled climate models with higher oceanic resolution is crucial for improving climate projections and predicting decadal climate modes of variability accurately.
JOURNAL OF CLIMATE
(2021)
Article
Environmental Sciences
Ryo Furue, Masami Nonaka, Hideharu Sasaki
Summary: The Indonesian Throughflow carries an average of 15 Sv of water annually from the Pacific to the Indian Ocean, with a variation of 1 to 4 Sv. A study using a global oceanic circulation model shows that the annual-mean transport of the Indonesian Throughflow differs by about 1 Sv between ensemble members. The variability of the Indonesian Throughflow is attributed to genuine changes in the flow rather than local eddies or currents within the Indonesian Seas, and may be influenced by zonal jets in the western subtropical North Pacific.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Oceanography
Yuanlong Li, Yaru Guo, Yanan Zhu, Shoichiro Kido, Lei Zhang, Fan Wang
Summary: Prominent interannual-to-decadal variations in heat content and mesoscale eddy activity were observed in the southeast Indian Ocean from 1993 to 2020. The study identifies the strengthening of the Indonesian Throughflow and anomalous cyclonic winds as the key drivers of these variations. The increase in eddy kinetic energy in the Leeuwin Current system significantly influences the ocean heat content.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Yusheng Wu, Guidi Zhou, Guifen Wang, Xuhua Cheng
Summary: This study evaluates the relative importance of forced and intrinsic SST variability in the Kuroshio-Oyashio Extension (KOE) region on submonthly timescales. The results show that forced SST variability accounts for a very small fraction of the total variability in the KOE region, indicating the dominance of intrinsic oceanic processes.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Mareike Koerner, Martin Claus, Peter Brandt, Franz Philip Tuchen
Summary: This study focuses on the intraseasonal meridional velocity variability in the equatorial Atlantic Ocean and its importance for the deep equatorial circulation. By using a high-resolution ocean model and comparing the results with shipboard and moored data, the study identifies different sources and characteristics of intraseasonal energy in the deep equatorial Atlantic. The findings provide a basis for further investigation into the formation and maintenance of the deep equatorial circulation.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Meteorology & Atmospheric Sciences
Davide Zanchettin, Shih-Wei Fang, Myriam Khodri, Nour-Eddine Omrani, Sara Rubinetti, Angelo Rubino, Claudia Timmreck, Johann H. Jungclaus
Summary: This study investigates the nature of Atlantic Multidecadal Variability (AMV) and the role of ocean circulation using an Earth System Model. The results show that AMV events are associated with anomalous sea surface temperature and salinity, but only partly match the long-term AMV pattern. Cold-fresh anomalies develop in subpolar regions during the peak cold phase of AMV events, while warm-salty anomalies occur in subtropical regions, forming a meridional dipole pattern. The Atlantic Meridional Overturning Circulation (AMOC) significantly weakens during the warm-to-cold transition of AMV events and recovers afterward. Overall, the results support the view that AMV is a potential intrinsic feature of climate with episodic strong anomalous events displaying different spatial patterns and timings for the warm-to-cold and subsequent cold-to-warm transitions, requiring a comprehensive understanding of associated thermohaline conditions and the AMOC-AMV relationship for attributing historical AMV fluctuations.
Article
Oceanography
Xiaomei Yan, Dujuan Kang, Enrique N. Curchitser, Xiaohui Liu, Chongguang Pang, Linlin Zhang
Summary: The study investigates the seasonal variability of the eddy kinetic energy (EKE) along the Kuroshio Current (KC) using outputs from an eddy-resolving ocean model. It reveals that the seasonal cycle of EKE is determined by the interaction of large-scale and small-scale instabilities. The EKE exhibits different patterns and mechanisms in different regions of the KC, with factors such as advection, external forcing, and baroclinic and barotropic instabilities playing a role.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2023)
Article
Multidisciplinary Sciences
Luc Beaufort, Clara T. Bolton, Anta-Clarisse Sarr, Baptiste Sucheras-Marx, Yair Rosenthal, Yannick Donnadieu, Nicolas Barbarin, Samantha Bova, Pauline Cornuault, Yves Gally, Emmeline Gray, Jean-Charles Mazur, Martin Tetard
Summary: The study reveals that over the past 2.8 million years, Earth's orbital eccentricity has significantly influenced the morphological evolution of coccolithophores, leading them to adapt to different climate environments. Simulations suggest that changes in seasonal cycles directly impact the diversity of ecological niches in the ocean, affecting the morphology and carbonate export of coccolithophores.
Article
Oceanography
Linlin Zhang, Yuchao Hui, Tangdong Qu, Dunxin Hu
Summary: Seasonal modulation of subthermocline eddy kinetic energy (EKE) east of the Philippines shows significant north-south variation, mainly caused by the seasonal modulation of barotropic instability.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2021)
Article
Geosciences, Multidisciplinary
Mengnan Zhao, Rui M. Ponte, Thierry Penduff, Sally Close, William Llovel, Jean-Marc Molines
Summary: The study reveals that intrinsic variability generated by nonlinear oceanic processes is larger than atmospherically driven variability in the ocean, especially in the intra-annual range. Intrinsic variability is significant at various spatiotemporal scales, supporting the process of energy inverse cascade.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Oceanography
Astrid Pacini, Robert S. Pickart
Summary: This study investigates the transport mechanism of Arctic-origin and Greenland meltwaters in the Labrador Sea, and identifies wind-driven upwelling events northwest of Cape Farewell. It shows that during storms, freshwater is transported offshore in the surface layer and warm, saline, Atlantic-origin waters are brought onshore at depth.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Meteorology & Atmospheric Sciences
K. A. Graham, C. D. Holmes, G. Friedrich, C. D. Rauschenberg, C. R. Williams, J. W. Bottenheim, F. P. Chavez, J. W. Halfacre, D. K. Perovich, P. B. Shepson, W. R. Simpson, P. A. Matrai
Summary: As the Arctic climate warms, understanding variability and change in the Arctic carbon cycle is crucial. This study analyzed atmospheric CO2 measurements in the Arctic from on-ice measurements and coastal observatories. The results showed differences in seasonal amplitudes between on-ice and coastal measurements and contradicted expectations of CO2 increases during winter. A model simulation explained most of the CO2 variability over the Arctic Ocean, with terrestrial biosphere fluxes and synoptic transport playing a major role. Coastal sites had similar interannual variability, but sea ice observations were distinct and not reproduced by the model, suggesting air-sea CO2 exchange as an important driver.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Charles X. Light, Brian K. Arbic, Paige E. Martin, Laurent Brodeau, J. Thomas Farrar, Stephen M. Griffies, Ben P. Kirtman, Lucas C. Laurindo, Dimitris Menemenlis, Andrea Molod, Arin D. Nelson, Ebenezer Nyadjro, Amanda K. O'Rourke, Jay F. Shriver, Leo Siqueira, R. Justin Small, Ehud Strobach
Summary: This paper investigates high-frequency variability of precipitation using various models and methods, and finds that high-resolution models yield results closer to observations. Increasing model grid spacing generally increases high-frequency precipitation variance in climate modeling.
Article
Oceanography
Keshav J. Raja, Maarten C. Buijsman, Jay F. Shriver, Brian K. Arbic, Oladeji Siyanbola
Summary: This study investigates the generation, propagation, and dissipation of wind-generated near-inertial waves (NIWs) in a global ocean with realistic atmospheric forcing and background circulation. The results show that most of the NIW energy is dissipated in lower latitudes, and cyclonic and anticyclonic vorticity play a crucial role in the distribution of NIW energy. The locally dissipated fraction of NIW energy is uniform throughout the global ocean.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Review
Oceanography
Brian K. Arbic
Summary: This article reviews an emerging class of high-resolution global models that consider the effects of both atmospheric fields and astronomical tidal potentials, and can simulate various oceanic phenomena. These models have numerous applications in satellite oceanography, operational oceanography, boundary forcing, tidal-cryosphere interactions, and assessment of the impact of tidal changes on future coastal flooding hazards.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Geosciences, Multidisciplinary
Ritabrata Thakur, Brian K. Arbic, Dimitris Menemenlis, Kayhan Momeni, Yulin Pan, W. R. Peltier, Joseph Skitka, Matthew H. Alford, Yuchen Ma
Summary: We propose improvements to the modeling of the vertical wavenumber spectrum of internal gravity waves in regional ocean simulations. Our study focuses on the sensitivity of the model to mixing parameters and compares the results to observations. The findings suggest that improving the mixing parameters can enhance the representation of internal wave dynamics.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Oceanography
Houssam Yassin, Stephen M. Griffies
Summary: The study demonstrates that surface geostrophic velocity in regions with mixed layer instability is mainly induced by surface buoyancy anomalies. By considering variable stratification, the study shows that buoyancy anomalies can generate different dynamical regimes depending on the vertical structure of stratification. The different stratification structures result in different velocity fields and surface kinetic energy spectra.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Multidisciplinary Sciences
Benjamin A. Storer, Michele Buzzicotti, Hemant Khatri, Stephen M. Griffies, Hussein Aluie
Summary: The development of satellite altimetry has led to increased attention on the presence of mesoscale eddies in the ocean. This study introduces a new method to analyze larger scales and reveals the Antarctic Circumpolar Current as the dominant feature of the global circulation. The study also shows seasonal variations in length scales, with different kinetic energy peaks in spring and late summer in both hemispheres.
NATURE COMMUNICATIONS
(2022)
Review
Physics, Fluids & Plasmas
Hussein Aluie, Shikhar Rai, Hao Yin, Aarne Lees, Dongxiao Zhao, Stephen M. Griffies, Alistair Adcroft, Jessica K. Shang
Summary: The paper highlights the different roles of vorticity and strain in the transport of coarse-grained scalars at large scales of turbulence. It introduces a new multiscale gradient expansion method, and emphasizes that the contribution of subscale vorticity is solely a conservative advection.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Meteorology & Atmospheric Sciences
Oladeji Q. Siyanbola, Maarten C. Buijsman, Audrey Delpech, Lionel Renault, Roy Barkan, Jay F. Shriver, Brian K. Arbic, James C. McWilliams
Summary: This study investigates the impact of remotely generated internal waves on the internal wave energetics near the U.S. West Coast using realistic regional ocean simulations. The results show that internal tide reflections can be as high as 73%, although they are reduced with increased sponge viscosity and/or sponge layer width. The presence of remote internal waves improves the model's variance and spatial correlations, making it more consistent with mooring and altimetry datasets. However, excessive reflections of internal waves from the interior should be avoided at the open boundaries.
Article
Meteorology & Atmospheric Sciences
Steven R. Brus, Kristin N. Barton, Nairita Pal, Andrew F. Roberts, Darren Engwirda, Mark R. Petersen, Brian K. Arbic, Damrongsak Wirasaet, Joannes J. Westerink, Michael Schindelegger
Summary: Self attraction and earth-loading effects are important for accurately modeling global tides. We investigate two different approaches to perform these calculations for ocean models that employ unstructured meshes and distributed memory parallelization. Our results show that the scalability of the unstructured mesh approach allows for more efficient spherical harmonics transforms for high-resolution meshes and large processor counts, enabling the efficient inclusion of tidal dynamics in large-scale Earth system model simulations.
Article
Oceanography
Jan-Erik Tesdal, Graeme A. MacGilchrist, Rebecca L. Beadling, Stephen M. Griffies, John P. Krasting, Paul J. Durack
Summary: Two different climate models have been used to study the impact of wind stress and Antarctic ice sheet melting on the Southern Ocean meridional overturning circulation (SO MOC). The study shows that the largest impact is found in the lower limb of the SO MOC, associated with the formation of Antarctic Bottom Water (AABW), which is enhanced by wind and weakened by AIS meltwater perturbations. Both models indicate a reduction in AABW transport due to AIS melting, however, the higher resolution simulation shows a greater volume deflation of AABW south of 30°S.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Meteorology & Atmospheric Sciences
Gaspard Geoffroy, Jonas Nycander, Maarten C. Buijsman, Jay F. Shriver, Brian K. Arbic
Summary: The autocovariance of the semidiurnal internal tide (IT) is examined using the HYCOM model, which shows a globally low bias in terms of IT variance and decay of the IT autocovariance. Except in the Southern Ocean, the spatial correlation between the model and observational data suggests that the generation of semidiurnal ITs is well captured by the model.
Article
Geosciences, Multidisciplinary
Nairita Pal, Kristin N. Barton, Mark R. Petersen, Steven R. Brus, Darren Engwirda, Brian K. Arbic, Andrew F. Roberts, Joannes J. Westerink, Damrongsak Wirasaet
Summary: This paper presents the implementation of tides in MPAS-Ocean, which overcomes the limitation of low resolution by using unstructured global meshing. The tidal constituents calculated using MPAS-Ocean closely agree with the results of the global tidal prediction model TPXO8. The presence of Antarctic ice shelf cavities affects the amplitude and phase of tidal constituents, with lower complex errors observed when simulating with ice shelves.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2023)
Article
Geosciences, Multidisciplinary
Molly M. Range, Brian K. Arbic, Brandon C. Johnson, Theodore C. Moore, Vasily Titov, Alistair J. Adcroft, Joseph K. Ansong, Christopher J. Hollis, Jeroen Ritsema, Christopher R. Scotese, He Wang
Summary: This study presents the first global simulation of the Chicxulub impact tsunami and finds that the energy of this tsunami surpassed the 2004 Indian Ocean tsunami. Flow velocities exceeding 20 cm/s were observed along shorelines worldwide as well as in various open-ocean regions.
Article
Geosciences, Multidisciplinary
Takaya Uchida, Julien Le Sommer, Charles Stern, Ryan P. Abernathey, Chris Holdgraf, Aurelie Albert, Laurent Brodeau, Eric P. Chassignet, Xiaobiao Xu, Jonathan Gula, Guillaume Roullet, Nikolay Koldunov, Sergey Danilov, Qiang Wang, Dimitris Menemenlis, Clement Bricaud, Brian K. Arbic, Jay F. Shriver, Fangli Qiao, Bin Xiao, Arne Biastoch, Rene Schubert, Baylor Fox-Kemper, William K. Dewar, Alan Wallcraft
Summary: With the increase in computational power, higher-resolution ocean models have been developed, but the larger data size poses challenges for data transfer and analysis. A cloud-based analysis framework is proposed to address these challenges, allowing for more efficient and collaborative analysis of model outputs.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Development Studies
Erich K. Eberhard, Jessica Hicks, Adam C. Simon, Brian K. Arbic
WORLD DEVELOPMENT PERSPECTIVES
(2022)