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52 results for “Ocean circulation”
Southern Ocean's circulation impact on the marine carbon cycle
<p>In the context of past and present climate change, the Southern Ocean (SO) has been identified as a crucial region modulating the concentration of atmospheric CO<sub>2</sub>. The sustained upwelling of carbon-rich deep waters and inefficient nutrient utilisation at the surface of SO leads to an outgassing of natural CO<sub>2</sub>, while anthropogenic CO<sub>2</sub> is entrained to depth during the formation of Antarctic Bottom water (AABW), Antarctic intermediate water (AAIW) and sub-Antarctic mode water (SAMW). Changes to the SO circulation resulting from both dynamic and buoyancy forcing can alter the rate of upwelling as well as formation and subsequent transport of AABW, AAIW and SAMW, thus impacting the air-sea CO<sub>2</sub> exchange in SO. Models of all complexity robustly show that stronger southern hemispheric (SH) westerlies enhance the SO upwelling, thus leading to stronger natural CO<sub>2</sub> outgassing, with a sensitivity of ∼0.13 GtC/yr for a 10% increase in SH westerly windstress. While the impact of changes in the position of the SH westerly winds was previously unclear, recent simulations with high-resolution ocean/sea-ice/carbon cycle models show that a poleward shift of the SH westerlies also enhances natural CO<sub>2</sub> outgassing with a sensitivity of ∼0.08GtC/yr for a 5• poleward shift. While enhanced AABW transport reduces deep ocean natural DIC concentration and increases surface natural DIC concentration, it acts on a centennial timescale. Future work should better constrain both the natural and anthropogenic carbon cycle response to changes in AABW and the compound impacts of dynamic and buoyancy changes on the SO marine carbon cycle.</p>
Data for: Influence of Anomalous Ocean Heat Transport on the Extratropical Atmospheric Circulation in a High-Resolution Slab-Ocean Coupled Model
<p>This dataset, provided in NetCDF format, supports the research presented in the paper titled "Influence of Anomalous Ocean Heat Transport on the Extratropical Atmospheric Circulation in a High-Resolution Slab-Ocean Coupled Model." Please contact Dr. Sun (ltsun@rams.colostate.edu) if you have any questions.</p>
Model outputs for "Multi-grid algorithm for passive tracer transport in NEMO ocean circulation model"
<p>Model outputs used to write "Multi-grid algorithm for passive tracer transport in NEMO ocean circulation model" publication.</p>
Paleobathymetric reconstructions of the SW Barents Seaway and their implications for Atlantic–Arctic ocean circulation
<p>These files are the paleobathymetry and paleotopography reconstructions published in Lasabuda et al., 2023.</p> <p>There are five time slices,</p> <ol> <li>Base Lower Eocene (55 Ma)</li> <li>Base Middle Eocene (47 Ma)</li> <li>Base Oligocene (33 Ma)</li> <li>Base Miocene (23 Ma)</li> <li>Base Quaternary (2.7 Ma)</li> </ol> <p>They are in zmap with coordinate reference system ED50-UTM33.</p> <p> </p> <p>Reference to the article:</p> <p>Lasabuda, A.P.E., Hanssen, A., Laberg, J.S. <em>et al.</em> Paleobathymetric reconstructions of the SW Barents Seaway and their implications for Atlantic–Arctic ocean circulation. <em>Commun Earth Environ</em> <strong>4</strong>, 231 (2023). https://doi.org/10.1038/s43247-023-00899-y</p>
Small orbital forcing changes alter the ocean circulation of Earth's next future supercontinent: Simulations
<p>This dataset contains the simulations from the manuscript "Small orbital forcing changes alter the ocean circulation of Earth's next future supercontinent".</p> <p>From the methods section of the manuscript:<br>The simulations are carried out using the fully-coupled ocean-atmosphere general circulation model ROCKE-3D version Planet 1.0 (R3D1) (Way et al., 2017). The model is run at a horizontal resolution of 4 x 5 degrees and simulations were integrated for 5000 and 7000 years for PD and future forcing, respectively, to ensure they were in equilibrium. The topography and bathymetry is the one used by Way et al. (2021) in their simulation 2 (Aurica). This includes a fully dynamic ocean 4252 m deep and land elevations close to present day mean topography and elevations between 1 and 858 m.<br>Due to high uncertainties in its future evolution, atmospheric composition is kept constant at year 1850 levels, following the setup in Way et al. (2021): the atmosphere is dominated by nitrogen with 21% oxygen, 285 ppmv CO2, 0.3 ppmv N2O and 0.79 ppmv CH4, and no aerosols or ozone are included.<br>Two simulations are presented: PD_Aurica which which has present-day day-length (24 hrs) and insolation (1361 Wm-2) and F_Aurica where we apply orbital forcing consistent with 250 Ma into the future - day length is increased by 0.5 hrs and insolation is increased by 2.6 Wm-2 (see Way et al., 2021). </p> <p>PD_Aurica corresponds to the output files with the following names: ANN4500-4999.*F_AURICA_RAND_PD_03.nc<br>F_Aurica corresponds to the output files with the following names: ANN6500-6999.*F_AURICA_RAND_PD_01.nc</p> <p>The diagnostic files including AGC, AIJ, AIJK and AIJL in the filename contain atmospheric diagnostics and outputs, whereas those that include OIJ, OIJL, OJL and OTJ contain ocean diagnostics and outputs.</p> <p><span><span><span><a href="https://science.gsfc.nasa.gov/author/533569006/35432">Way M. J.</a></span></span><span>, </span></span><span><span><span><a href="https://science.gsfc.nasa.gov/author/830545035/35432">I. Aleinov</a></span></span><span>, </span></span><span><span>D. S. Amundsen</span><span>, </span></span><span><span><a title="See all authors for this publication">et al.</a> </span></span> <span>2017.</span> <span> "Resolving Orbital and Climate Keys of Earth and Extraterrestrial Environments with Dynamics (ROCKE-3D) 1.0: A General Circulation Model for Simulating the Climates of Rocky Planets." </span> <em>The Astrophysical Journal Supplement Series</em> <strong>231</strong> <span><strong>(1)</strong>: </span> <span>12</span> <span> [<a href="http://dx.doi.org/10.3847/1538-4365/aa7a06">10.3847/1538-4365/aa7a06</a>]</span></p> <p><span><span><span><a href="https://science.gsfc.nasa.gov/author/533569006/42520">Way M. J.</a></span></span><span>, </span></span><span><span>H. S. Davies</span><span>, </span></span><span><span>J. C. Duarte</span><span>, </span></span><span><span><a title="See all authors for this publication">et al.</a> </span></span> <span>2021.</span> <span> "The Climates of Earth’s Next Supercontinent: Effects of Tectonics, Rotation Rate, and Insolation." </span> <em>Geochemistry, Geophysics, Geosystems</em> <strong>22</strong> <span><strong>(8)</strong>: </span> <span> [<a href="http://dx.doi.org/10.1029/2021gc009983">10.1029/2021gc009983</a>]</span></p> <p> </p> <p> </p>
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation
The meridional overturning circulation (MOC) in the Southern Ocean is investigated using hydrographic observations combined with satellite measurements of sea surface height. A three-dimensional (spatial and vertical) estimate of the isopycnal eddy diffusivity in the Southern Ocean is obtained using the theory of Ferrari and Nikurashin that includes the influence of suppression of the diffusivity by the strong, time-mean flows. It is found that the eddy diffusivity is enhanced at depth, reaching a maximum at the critical layer near 1000 m. The estimate of diffusivity is used with a simple diffusive parameterization to estimate the meridional eddy volume flux. This estimate of eddy volume flux is combined with an estimate of the Ekman transport to reconstruct the time-mean overturning circulation. By comparing the reconstruction with, and without, suppression of the eddy diffusivity by the mean flow, the influence of the suppression on the overturning is illuminated. It is shown that the suppression of the eddy diffusivity results in a large reduction of interior eddy transports and a more realistic eddy-induced overturning circulation. Finally, a simple conceptual model is used to show that the MOC is influenced not only by the existence of enhanced diffusivity at depth but also by the details of the vertical structure of the eddy diffusivity, such as the depth of the critical layer.
Ocean Gateways and Ocean Circulation Dynamics: Unveiling the Deep Water-Mass properties in the Western Equatorial Pacific and Eastern Indian Ocean since the middle
<p>File contains a dataset related to census counts and stable isotopes that we used to write our manuscript.</p>
Data from: Isopycnal mixing suppression by the Antarctic Circumpolar Current and the Southern Ocean Meridional Overturning Circulation
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Southern Ocean's circulation impact on the marine carbon cycle
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Data from: Tropical Indian Ocean drives Hadley circulation change in a warming climate
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Data from: Ocean circulation model predicts high genetic structure in a long-lived pelagic developer
Understanding the movement of genes and individuals across marine seascapes is a long-standing challenge in marine ecology, and can inform our understanding of local adaptation, the persistence and movement of populations, and the spatial scale of effective management. Patterns of gene flow in the ocean are often inferred based on population genetic analyses coupled with knowledge of species' dispersive life histories. However, genetic structure is the result of time-integrated processes, and may not capture present-day connectivity between populations. Here we use a high-resolution oceanographic circulation model to predict larval dispersal along the complex coastline of western Canada that includes the transition between two well-studied zoogeographic provinces. We simulate dispersal in a benthic sea star with a 6-10 week pelagic larval phase, and test predictions of this model against previously observed genetic structure including a strong phylogeographic break within the zoogeographical transition zone. We also test predictions with new genetic sampling in a site within the phylogeographic break. We find that the coupled genetic and circulation model predicts the high degree of genetic structure observed in this species, despite its long pelagic duration. High genetic structure on this complex coastline can thus be explained through ocean circulation patterns which tend to retain passive larvae within 20 - 50 km of their parents, suggesting a necessity for close-knit design of Marine Protected Area networks.
cGENIE model experiment results for 'Sensitivity of ocean circulation to warming during the Early Eocene greenhouse'
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Model output for: "Freshwater input from glacier melt outside Greenland alters modeled northern high-latitude ocean circulation"
<p>NEMO-ANHA4 and OGGM model output files used in the article: "Freshwater input from glacier melt outside Greenland alters modeled northern high-latitude ocean circulation".</p> <p> </p> <p>halfsolid.zip and noOGGM.zip contain output of the runs called <em>halfsolid</em> and <em>noOGGM</em> in the article. output_data_OGGM.zip contains the output files of OGGM runs.</p>
Data supplementing article "Estuarine circulation in a shallow but stratified estuary: Different responses to river discharge between deep ship channel and shoals" submitted to Journal of Geophysical Research: Oceans
<p>The dataset uploaded includes the measured salinity and velocity at two monitoring stations (one at the lower Mobile Bay and the other at the eastern edge of ship channel in middle Mobile Bay) and from multiple ship cruises crossing the lower, middle, and upper Mobile Bay. </p> <p>Detail information on the measurement frequency, date, and location can be found in the mat files. Records with bad quality are filled with NaN values. </p> <p> </p> <p> </p>
A Dataset for Response of Oceanic Meridional Overturning Circulation to Vegetation Removal on Different Continents
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Effects of Horizontal Resolution on Long-Range Equatorward Radiation of Near-inertial Internal Waves in Ocean General Circulation Models
<p>Effects of Horizontal Resolution on Long-Range Equatorward Radiation of Near-inertial Internal Waves in Ocean General Circulation Models</p>
Non-hydrostatic MASNUM Ocean General Circulation Model codes and results
<p>non-hydro-masnum.rar: codes for Non-hydrostatic MASNUM Ocean General Circulation Model.</p> <p>analyze_test_section.mat: velocities in the section for the ideal experiment.</p> <p>analyze_test_variation.mat: variation of the velocity for the ideal experiment.</p> <p>res_hs_all_1.mat, res_hs_all_2.mat and res_hs_all_3.mat: hydrostatic MASNUM model simulation for the internal tides in the Northern South Chine Sea.</p> <p>res_it_all_1.mat, res_it_all_2.mat and res_it_all_3.mat: non-hydrostatic MASNUM model simulation for the internal tides in the Northern South Chine Sea.</p> <p>sst_01.mat, sst_02.mat and sst_03.mat: sea surface temperature simulation.</p>
Data from: Going with the flow: the role of ocean circulation in global marine ecosystems under a changing climate
Ocean warming, acidification, deoxygenation and reduced productivity are widely considered to be the major stressors to ocean ecosystems induced by emissions of CO2. However, an overlooked stressor is the change in ocean circulation in response to climate change. Strong changes in the intensity and position of the western boundary currents have already been observed, and the consequences of such changes for ecosystems are beginning to emerge. In this study, we address climatically induced changes in ocean circulation on a global scale but relevant to propagule dispersal for species inhabiting global shelf ecosystems, using a high resolution global ocean model run under the IPCC RCP 8.5 scenario. The ¼ degree model resolution allows improved regional realism of the ocean circulation beyond that of available CMIP5-class models. We use a Lagrangian approach forced by modelled ocean circulation to simulate the circulation pathways that disperse planktonic life stages. Based on trajectory backtracking, we identify present-day coastal retention, dominant flow and dispersal range for coastal regions at the global scale. Projecting into the future, we identify areas of the strongest projected circulation change and present regional examples with the most significant modifications in their dominant pathways. Climatically-induced changes in ocean circulation should be considered as an additional stressor of marine ecosystems in a similar way to ocean warming or acidification.
Figure Data for Oka et al. (2021) "Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean"
<p>Figure Data for Oka et al. (2021) "Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean" </p>
Dataset for paper "Equatorial Pacific sea-air CO2 exchange modulated by upper ocean circulation during the last deglaciation" submittted to Geophysical Research Letters
<p>Data of the <em>p</em>CO<sub>2</sub> and ∆<em>p</em>CO<sub>2_sw-atm</sub> from <em>G. ruber</em> 𝛿<sup>11</sup>B, 𝛿<sup>11</sup>B of <em>G. sacculifer</em>, 𝛿<sup>18</sup>O of <em>G. ruber</em> and <em>P. obliquiloculata</em>, ∆𝛿<sup>18</sup>O<sub>P-G</sub>, bulk 𝛿<sup>15</sup>N in core MD10-3340 (0º31.0’S, 128º43.5’E, water depth 1094 m), and upper Ocean Heat Content (OHC) in the Western Equatorial Pacific (WEP).</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.