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Articles de revues sur le sujet « Equatorial and regional oceanography »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 31 juillet 2025

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1

Jouanno, Julien, Frédéric Marin, Yves du Penhoat, and Jean-Marc Molines. "Intraseasonal Modulation of the Surface Cooling in the Gulf of Guinea." Journal of Physical Oceanography 43, no. 2 (2013): 382–401. http://dx.doi.org/10.1175/jpo-d-12-053.1.

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Abstract A regional numerical model of the tropical Atlantic Ocean and observations are analyzed to investigate the intraseasonal fluctuations of the sea surface temperature at the equator in the Gulf of Guinea. Results indicate that the seasonal cooling in this region is significantly shaped by short-duration cooling events caused by wind-forced equatorial waves: mixed Rossby–gravity waves within the 12–20-day period band, inertia–gravity waves with periods below 11 days, and equatorially trapped Kelvin waves with periods between 25 and 40 days. In these different ranges of frequencies, it is

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Holmes, R. M., and L. N. Thomas. "The Modulation of Equatorial Turbulence by Tropical Instability Waves in a Regional Ocean Model." Journal of Physical Oceanography 45, no. 4 (2015): 1155–73. http://dx.doi.org/10.1175/jpo-d-14-0209.1.

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AbstractSmall-scale turbulent mixing in the upper Equatorial Undercurrent (EUC) of the eastern Pacific cold tongue is a critical component of the SST budget that drives variations in SST on a range of time scales. Recent observations have shown that turbulent mixing within the EUC is modulated by tropical instability waves (TIWs). A regional ocean model is used to investigate the mechanisms through which large-scale TIW circulation modulates the small-scale shear, stratification, and shear-driven turbulence in the EUC. Eulerian analyses of time series taken from both the model and the Tropical

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Cherian, D. A., D. B. Whitt, R. M. Holmes, R. C. Lien, S. D. Bachman, and W. G. Large. "Off-Equatorial Deep-Cycle Turbulence Forced by Tropical Instability Waves in the Equatorial Pacific." Journal of Physical Oceanography 51, no. 5 (2021): 1575–93. http://dx.doi.org/10.1175/jpo-d-20-0229.1.

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AbstractThe equatorial Pacific cold tongue is a site of large heat absorption by the ocean. This heat uptake is enhanced by a daily cycle of shear turbulence beneath the mixed layer—“deep-cycle turbulence”—that removes heat from the sea surface and deposits it in the upper flank of the Equatorial Undercurrent. Deep-cycle turbulence results when turbulence is triggered daily in sheared and stratified flow that is marginally stable (gradient Richardson number Ri ≈ 0.25). Deep-cycle turbulence has been observed on numerous occasions in the cold tongue at 0°, 140°W, and may be modulated by tropica

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Couvelard, Xavier, Patrick Marchesiello, Lionel Gourdeau, and Jerome Lefèvre. "Barotropic Zonal Jets Induced by Islands in the Southwest Pacific." Journal of Physical Oceanography 38, no. 10 (2008): 2185–204. http://dx.doi.org/10.1175/2008jpo3903.1.

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Abstract The oceanic circulation entering the tropical southwest Pacific (SWP) is dominated by the broad westward flow of the South Equatorial Current (SEC), which is forced by the trade winds. It has been argued that the numerous islands of the SWP are able to restructure the SEC into a series of deep and narrow zonal jets, which control important pathways connecting equatorial and extraequatorial signals. The primary objective of this paper is to improve the understanding of the structure and dynamics of SWP zonal jets, giving special attention to topographic effects. This study is based on

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Johnson, Gregory C. "Generation and Initial Evolution of a Mode Water θ–S Anomaly*". Journal of Physical Oceanography 36, № 4 (2006): 739–51. http://dx.doi.org/10.1175/jpo2895.1.

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Abstract Generation and evolution of an isopycnal potential temperature–salinity (θ–S), or spiciness, anomaly is studied around 20°–23°S, 110°W in the austral winter of 2004. Two profiling CTD floats deployed in the region in January 2004 provide the observations. The anomaly (defined as relative to water properties of the preceding summer) is very large (initially about 0.35 in S and about 0.9°C in θ). It is associated with the winter ventilation of a thick, low-potential-vorticity layer known as South Pacific Eastern Subtropical Mode Water. Regional lateral θ and S distributions at the surfa

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Chen, Gengxin, Dongxiao Wang, Weiqing Han, et al. "The Extreme El Niño Events Suppressing the Intraseasonal Variability in the Eastern Tropical Indian Ocean." Journal of Physical Oceanography 50, no. 8 (2020): 2359–72. http://dx.doi.org/10.1175/jpo-d-20-0041.1.

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AbstractIn the eastern tropical Indian Ocean, intraseasonal variability (ISV) affects the regional oceanography and marine ecosystems. Mooring and satellite observations documented two periods of unusually weak ISV during the past two decades, associated with suppressed baroclinic instability of the South Equatorial Current. Regression analysis and model simulations suggest that the exceptionally weak ISVs were caused primarily by the extreme El Niño events and modulated to a lesser extent by the Indian Ocean dipole. Additional observations confirm that the circulation balance in the Indo-Paci

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Ouyang, Yating, Yuhong Zhang, Jianwei Chi, Qiwei Sun, and Yan Du. "Regional difference of sea surface salinity variations in the western tropical pacific." Journal of Oceanography 77, no. 4 (2021): 647–57. http://dx.doi.org/10.1007/s10872-021-00598-2.

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AbstractRegional difference of sea surface salinity (SSS) variations in the western tropical Pacific is investigated with Ocean Reanalysis System 5 datasets. Three robust zonal bands of SSS variations have been identified in the northwestern tropical Pacific (NWTP), the western equatorial tropical Pacific (WEqP), and the southwestern tropical Pacific (SWTP), respectively. SSS in the WEqP and the SWTP has a strong interannual variability that is related to ENSO. In the WEqP, SSS variations are mainly controlled by anomalous freshwater flux, while in the SWTP they are governed by both freshwater

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Lindstrom, Eric, James Edson, Julian Schanze, and Andrey Shcherbina. "SPURS-2: Salinity Processes in the Upper-Ocean Regional Study 2 – The Eastern Equatorial Pacific Experiment." Oceanography 32, no. 2 (2019): 15–19. http://dx.doi.org/10.5670/oceanog.2019.207.

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Wijffels, Susan E., Gary Meyers, and J. Stuart Godfrey. "A 20-Yr Average of the Indonesian Throughflow: Regional Currents and the Interbasin Exchange." Journal of Physical Oceanography 38, no. 9 (2008): 1965–78. http://dx.doi.org/10.1175/2008jpo3987.1.

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Abstract Twenty years of monthly or more frequent repeat expendable bathythermograph data are used to estimate the mean geostrophic velocity and transport relative to 750 m of the Indonesian Throughflow (ITF) and its partitioning through the major outflow straits into the Indian Ocean. Ekman transports are estimated from satellite and atmospheric reanalysis wind climatologies. A subsurface maximum near 100 m characterizes the geostrophic ITF, but Ekman flows drive a warm near-surface component as well. A subsurface intensified fresh Makassar Jet feeds the Lombok Strait Throughflow (∼2 Sv; 1Sv

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Tchilibou, Michel, Lionel Gourdeau, Rosemary Morrow, Guillaume Serazin, Bughsin Djath, and Florent Lyard. "Spectral signatures of the tropical Pacific dynamics from model and altimetry: a focus on the meso-/submesoscale range." Ocean Science 14, no. 5 (2018): 1283–301. http://dx.doi.org/10.5194/os-14-1283-2018.

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Abstract. The processes that contribute to the flat sea surface height (SSH) wavenumber spectral slopes observed in the tropics by satellite altimetry are examined in the tropical Pacific. The tropical dynamics are first investigated with a 1∕12∘ global model. The equatorial region from 10∘ N to 10∘ S is dominated by tropical instability waves with a peak of energy at 1000 km wavelength, strong anisotropy, and a cascade of energy from 600 km down to smaller scales. The off-equatorial regions from 10 to 20∘ latitude are characterized by a narrower mesoscale range, typical of midlatitudes. In th

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Qiu, Bo, and Shuiming Chen. "Multidecadal Sea Level and Gyre Circulation Variability in the Northwestern Tropical Pacific Ocean." Journal of Physical Oceanography 42, no. 1 (2012): 193–206. http://dx.doi.org/10.1175/jpo-d-11-061.1.

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Abstract Sea level rise with the trend &gt;10 mm yr−1 has been observed in the tropical western Pacific Ocean over the 1993–2009 period. This rate is 3 times faster than the global-mean value of the sea level rise. Analyses of the satellite altimeter data and repeat hydrographic data along 137°E reveal that this regionally enhanced sea level rise is thermosteric in nature and vertically confined to a patch in the upper ocean above the 12°C isotherm. Dynamically, this regional sea level trend is accompanied by southward migration and strengthening of the North Equatorial Current (NEC) and N

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Guiavarc'h, C., A. M. Treguier, and A. Vangriesheim. "Deep currents in the Gulf of Guinea: along slope propagation of intraseasonal waves." Ocean Science Discussions 6, no. 1 (2009): 57–94. http://dx.doi.org/10.5194/osd-6-57-2009.

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Abstract. In the Gulf of Guinea, intraseasonal variability is large at the equator and along the coast. Current data on the continental slope near 7.5° S show very energetic biweekly oscillations at 1300 m depth. A high resolution numerical model demonstrates that this deep variability is forced by equatorial winds, through the generation of equatorial Yanai waves that propagate eastward and at depth, and then poleward as coastal-trapped waves upon reaching the coast of Africa. Intraseasonal variability is intensified along the coast, especially in the 500–1500 m depth range, with the largest

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Travis, Seth, and Bo Qiu. "Decadal Variability in the South Pacific Subtropical Countercurrent and Regional Mesoscale Eddy Activity." Journal of Physical Oceanography 47, no. 3 (2017): 499–512. http://dx.doi.org/10.1175/jpo-d-16-0217.1.

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AbstractDecadal variability of eddy activity in the western, subtropical South Pacific is examined using the past two decades of satellite altimetry data. Between 21° and 29°S, there is a band of heightened eddy activity. In this region, the eastward South Pacific Subtropical Countercurrent (STCC) overlays the westward South Equatorial Current (SEC). This vertically sheared STCC–SEC system is subject to baroclinic instabilities. By using the European Centre for Medium-Range Weather Forecasts (ECMWF) Ocean Reanalysis System, version 4 (ORAS4), data and verifying with the gridded Argo float data

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Wilson, Moyra E. J. "Global and regional influences on equatorial shallow-marine carbonates during the Cenozoic." Palaeogeography, Palaeoclimatology, Palaeoecology 265, no. 3-4 (2008): 262–74. http://dx.doi.org/10.1016/j.palaeo.2008.05.012.

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Guiavarc'h, C., A. M. Treguier, and A. Vangriesheim. "Deep currents in the Gulf of Guinea: along slope propagation of intraseasonal waves." Ocean Science 5, no. 2 (2009): 141–53. http://dx.doi.org/10.5194/os-5-141-2009.

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Abstract. In the Gulf of Guinea, intraseasonal variability is large at the equator and along the coast. Current data on the continental slope near 7.5° S show very energetic biweekly oscillations at 1300 m depth. A high resolution primitive equation numerical model demonstrates that this deep variability is forced by equatorial winds, through the generation of equatorial Yanai waves that propagate eastward and at depth, and then poleward as coastally-trapped waves upon reaching the coast of Africa. Intraseasonal variability is intensified along the coast of the Gulf of Guinea, especially in th

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Zhang, Xuebin, Bruce Cornuelle, and Dean Roemmich. "Sensitivity of Western Boundary Transport at the Mean North Equatorial Current Bifurcation Latitude to Wind Forcing." Journal of Physical Oceanography 42, no. 11 (2012): 2056–72. http://dx.doi.org/10.1175/jpo-d-11-0229.1.

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Abstract The bifurcation of the North Equatorial Current (NEC) plays an important role in the heat and water mass exchanges between the tropical and subtropical gyres in the Pacific Ocean. The variability of western boundary transport (WBT) east of the Philippine coast at the mean NEC bifurcation latitude (12°N) is examined here. A tropical Pacific regional model is set up based on the Massachusetts Institute of Technology general circulation model and its adjoint, which calculates the sensitivities of a defined meridional transport to atmospheric forcing fields and ocean state going backward

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Chen, Ge, and Haitao Li. "Fine Pattern of Natural Modes in Sea Surface Temperature Variability: 1985–2003." Journal of Physical Oceanography 38, no. 2 (2008): 314–36. http://dx.doi.org/10.1175/2007jpo3592.1.

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Abstract A natural mode refers, in this study, to a periodic oscillation of sea surface temperature (SST) that is geophysically significant on a global, regional, or local scale. Using a newly developed harmonic extraction scheme by Chen, which has the advantage of being space–time decoupled and fully data adaptive, a variety of natural modes have been recovered from global monthly SST data for the period of 1985–2003. Among them, the eight most significant modes are identified as primary modes, whose spatial patterns are presented, along with their phase distributions. At seasonal time scales

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Ballarotta, Maxime, Clément Ubelmann, Marie-Isabelle Pujol, et al. "On the resolutions of ocean altimetry maps." Ocean Science 15, no. 4 (2019): 1091–109. http://dx.doi.org/10.5194/os-15-1091-2019.

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Abstract. The Data Unification and Altimeter Combination System (DUACS) produces sea level global and regional maps that serve oceanographic applications, climate forecasting centers, and geophysics and biology communities. These maps are generated using an optimal interpolation method applied to altimeter observations. They are provided on a global 1∕4∘ × 1∕4∘ (longitude × latitude) and daily grid resolution framework (1∕8∘ × 1∕8∘ longitude × latitude grid for the regional products) through the Copernicus Marine Environment Monitoring Service (CMEMS). Yet, the dynamical content of these maps

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Trenberth, Kevin E., and John T. Fasullo. "An Observational Estimate of Inferred Ocean Energy Divergence." Journal of Physical Oceanography 38, no. 5 (2008): 984–99. http://dx.doi.org/10.1175/2007jpo3833.1.

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Abstract Monthly net surface energy fluxes (FS) over the oceans are computed as residuals of the atmospheric energy budget using top-of-atmosphere (TOA) net radiation (RT) and the complete atmospheric energy (AE) budget tendency (δAE/δt) and divergence (∇ · FA). The focus is on TOA radiation from the Earth Radiation Budget Experiment (ERBE) (February 1985–April 1989) and the Clouds and Earth’s Radiant Energy System (CERES) (March 2000–May 2004) satellite observations combined with results from two atmospheric reanalyses and three ocean datasets that enable a comprehensive estimate of uncertain

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Liu, Lingling, Yuanlong Li, and Fan Wang. "MJO-Induced Intraseasonal Mixed Layer Depth Variability in the Equatorial Indian Ocean and Impacts on Subsurface Water Obduction." Journal of Physical Oceanography 51, no. 4 (2021): 1247–63. http://dx.doi.org/10.1175/jpo-d-20-0179.1.

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AbstractChange of oceanic surface mixed layer depth (MLD) is critical for vertical exchanges between the surface and subsurface oceans and modulates surface temperature variabilities on various time scales. In situ observations have documented prominent intraseasonal variability (ISV) of MLD with 30–105-day periods in the equatorial Indian Ocean (EIO) where the Madden–Julian oscillation (MJO) initiates. Simulation of Hybrid Coordinate Ocean Model (HYCOM) reveals a regional maximum of intraseasonal MLD variability in the EIO (70°–95°E, 3°S–3°N) with a standard deviation of ~14 m. Sensitivity ex

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Ferriss, Bridget E., and Timothy E. Essington. "Regional patterns in mercury and selenium concentrations of yellowfin tuna (Thunnus albacares) and bigeye tuna (Thunnus obesus) in the Pacific Ocean." Canadian Journal of Fisheries and Aquatic Sciences 68, no. 12 (2011): 2046–56. http://dx.doi.org/10.1139/f2011-120.

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Mercury (Hg) concentrations in high trophic level fish, such as bigeye tuna ( Thunnus obesus ) and yellowfin tuna ( Thunnus albacares ), can often exceed consumption advisories. Here we sampled 444 yellowfin and bigeye tuna to determine whether tuna Hg concentration varies regionally in the eastern and central Pacific Ocean and whether this variation corresponds to environmental characteristics that promote the bioavailability of Hg. Of the five regions sampled, we found significantly higher Hg concentrations in the eastern equatorial region (5°S–5°N; 110°W–120°W) for both species. Hg concentr

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Raes, Eric J., Levente Bodrossy, Jodie van de Kamp, et al. "Oceanographic boundaries constrain microbial diversity gradients in the South Pacific Ocean." Proceedings of the National Academy of Sciences 115, no. 35 (2018): E8266—E8275. http://dx.doi.org/10.1073/pnas.1719335115.

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Marine microbes along with microeukaryotes are key regulators of oceanic biogeochemical pathways. Here we present a high-resolution (every 0.5° of latitude) dataset describing microbial pro- and eukaryotic richness in the surface and just below the thermocline along a 7,000-km transect from 66°S at the Antarctic ice edge to the equator in the South Pacific Ocean. The transect, conducted in austral winter, covered key oceanographic features including crossing of the polar front (PF), the subtropical front (STF), and the equatorial upwelling region. Our data indicate that temperature does not de

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Romero-Torres, Mauricio, Alberto Acosta, and Eric A. Treml. "The regional structure of spawning phenology and the potential consequences for connectivity of coral assemblages across the Eastern Tropical Pacific." ICES Journal of Marine Science 74, no. 3 (2016): 613–24. http://dx.doi.org/10.1093/icesjms/fsw218.

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The coral reefs of the Eastern Tropical Pacific (ETP) are some of the most geographically isolated of the world. A key to understanding their long-term persistence and population recovery via dispersal (i.e. population connectivity), is knowing when the corals spawn in the region. To this end, we reviewed and synthesized the literature on the reproductive phenology of corals (month of spawning) and their dispersal-related characteristics to infer the potential impact on the region’s functional connectivity. We classified the region into four thermal regimes based on long-term mean sea surface

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Sun, Bingrong, Zhaohui Chen, Bin Wang, and Lixin Wu. "Seasonal variation of the North Equatorial Current bifurcation in regional model: Role of open boundary conditions." Ocean Modelling 145 (January 2020): 101528. http://dx.doi.org/10.1016/j.ocemod.2019.101528.

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Etourneau, J., R. S. Robinson, P. Martinez, and R. Schneider. "Equatorial Pacific peak in biological production regulated by nutrient and upwelling during the late Pliocene/early Pleistocene cooling." Biogeosciences 10, no. 8 (2013): 5663–70. http://dx.doi.org/10.5194/bg-10-5663-2013.

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Abstract. The largest increase in export production in the eastern Pacific of the last 5.3 Myr (million years) occurred between 2.2 and 1.6 Myr, a time of major climatic and oceanographic reorganization in the region. Here, we investigate the causes of this event using reconstructions of export production, nutrient supply and oceanic conditions across the Pliocene–Pleistocene in the eastern equatorial Pacific (EEP) for the last 3.2 Myr. Our results indicate that the export production peak corresponds to a cold interval marked by high nutrient supply relative to consumption, as revealed by the

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Etourneau, J., R. S. Robinson, P. Martinez, and R. Schneider. "Equatorial Pacific peak in biological production regulated by nutrient and upwelling during the late Pliocene/early Pleistocene cooling." Biogeosciences Discussions 10, no. 3 (2013): 5535–54. http://dx.doi.org/10.5194/bgd-10-5535-2013.

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Abstract. The largest increase in export production in the eastern Pacific of the last 5.3 Myr (million years) occurred between 2.2 and 1.6 Myr, a time of major climatic and oceanographic reorganization in the region. Here, we investigate the causes of this event using reconstructions of export production, nutrient supply and oceanic conditions across the Pliocene-Pleistocene in the eastern equatorial Pacific (EEP) for the last 3.2 Myr. Our results indicate that the export production peak corresponds to a cold interval marked by high nutrient supply relative to consumption, as revealed by the

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Brenes, Carlos, Daniel Ballestero, Rosario Benavides, Juan Pablo Salazar, and Gustavo Murillo. "Variations in the geostrophic circulation pattern and thermohaline structure in the Southeast Central American Pacific." Revista de Biología Tropical 64, no. 1 (2016): 121. http://dx.doi.org/10.15517/rbt.v64i1.23421.

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<p>This study was conducted in the southeast region of the Central American Pacific, an area of great oceanographic importance due to the presence of various upwelling phenomena and the direct influence of the ENSO on its waters. Its main objective was to contribute to the knowledge of the main factors that modulate the regional dynamics. We describe the geostrophic circulation and thermohaline features along two transects obtained in October 2010 and March 2011, one from Costa Rica at (84°54’ W - 9°37’ N) to the SW of Cocos Island at (88°19’ W - 3°06’ N), and the second oriented zonally

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Wilson, W. Douglas, Scott Glenn, Travis Miles, Anthony Knap, and Cesar Toro. "Transformative Ocean Observing for Hurricane Forecasting, Readiness, and Response in the Caribbean Tropical Storm Corridor." Marine Technology Society Journal 55, no. 3 (2021): 90–91. http://dx.doi.org/10.4031/mtsj.55.3.43.

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Abstract The upper ocean in the Western Tropical Atlantic tropical storm corridor—including the Caribbean Sea—is under-sampled and climatologically warming (Figure 1). Regionally varying Essential Ocean Features impacting tropical cyclone dynamics include fresh water upper ocean layers, mesoscale eddies, high Upper Ocean Heat Content values, and inflows from the Subtropical and Equatorial Atlantic. Ongoing research indicates that hurricane intensity forecasts can be improved with expanded and sustained ocean data collection and utilization along the hurricane path.This proposed activity will b

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Currie, J. C., M. Lengaigne, J. Vialard, et al. "Indian Ocean Dipole and El Niño/Southern Oscillation impacts on regional chlorophyll anomalies in the Indian Ocean." Biogeosciences Discussions 10, no. 3 (2013): 5841–88. http://dx.doi.org/10.5194/bgd-10-5841-2013.

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Abstract. The Indian Ocean Dipole (IOD) and the El Niño-Southern Oscillation (ENSO) frequently co-occur, driving significant interannual changes within the Indian Ocean. We use a four-decade hindcast from a coupled bio-physical ocean general circulation model, to disentangle patterns of chlorophyll anomalies driven by these two climate modes. Comparisons with remotely-sensed records show that the simulation competently reproduces the chlorophyll seasonal cycle, as well as open-ocean anomalies during the 1997–1998 ENSO and IOD event. Results show that anomalous surface and euphotic-layer chloro

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Belmadani, Ali, Nikolai A. Maximenko, Julian P. Mccreary, et al. "Linear Wind-Forced Beta Plumes with Application to the Hawaiian Lee Countercurrent*." Journal of Physical Oceanography 43, no. 10 (2013): 2071–94. http://dx.doi.org/10.1175/jpo-d-12-0194.1.

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Abstract Two numerical ocean models are used to study the baroclinic response to forcing by localized wind stress curl (i.e., a wind-forced β plume, which is a circulation cell developing to the west of the source region and composed of a set of zonal jets) with implications for the Hawaiian Lee Countercurrent (HLCC): an idealized primitive equation model [Regional Ocean Modeling System (ROMS)], and a global, eddy-resolving, general circulation model [Ocean General Circulation Model for the Earth Simulator (OFES)]. In addition, theoretical ideas inferred from a linear continuously stratified m

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Griffies, S. M., A. Gnanadesikan, K. W. Dixon, et al. "Formulation of an ocean model for global climate simulations." Ocean Science 1, no. 1 (2005): 45–79. http://dx.doi.org/10.5194/os-1-45-2005.

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Abstract. This paper summarizes the formulation of the ocean component to the Geophysical Fluid Dynamics Laboratory's (GFDL) climate model used for the 4th IPCC Assessment (AR4) of global climate change. In particular, it reviews the numerical schemes and physical parameterizations that make up an ocean climate model and how these schemes are pieced together for use in a state-of-the-art climate model. Features of the model described here include the following: (1) tripolar grid to resolve the Arctic Ocean without polar filtering, (2) partial bottom step representation of topography to better

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Griffies, S. M., A. Gnanadesikan, K. W. Dixon, et al. "Formulation of an ocean model for global climate simulations." Ocean Science Discussions 2, no. 3 (2005): 165–246. http://dx.doi.org/10.5194/osd-2-165-2005.

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Abstract. This paper summarizes the formulation of the ocean component to the Geophysical Fluid Dynamics Laboratory's (GFDL) coupled climate model used for the 4th IPCC Assessment (AR4) of global climate change. In particular, it reviews elements of ocean climate models and how they are pieced together for use in a state-of-the-art coupled model. Novel issues are also highlighted, with particular attention given to sensitivity of the coupled simulation to physical parameterizations and numerical methods. Features of the model described here include the following: (1) tripolar grid to resolve t

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Currie, J. C., M. Lengaigne, J. Vialard, et al. "Indian Ocean Dipole and El Niño/Southern Oscillation impacts on regional chlorophyll anomalies in the Indian Ocean." Biogeosciences 10, no. 10 (2013): 6677–98. http://dx.doi.org/10.5194/bg-10-6677-2013.

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Abstract. The Indian Ocean Dipole (IOD) and the El Niño/Southern Oscillation (ENSO) are independent climate modes, which frequently co-occur, driving significant interannual changes within the Indian Ocean. We use a four-decade hindcast from a coupled biophysical ocean general circulation model, to disentangle patterns of chlorophyll anomalies driven by these two climate modes. Comparisons with remotely sensed records show that the simulation competently reproduces the chlorophyll seasonal cycle, as well as open-ocean anomalies during the 1997/1998 ENSO and IOD event. Results suggest that anom

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Wei, Jun, M. T. Li, P. Malanotte-Rizzoli, A. L. Gordon, and D. X. Wang. "Opposite Variability of Indonesian Throughflow and South China Sea Throughflow in the Sulawesi Sea." Journal of Physical Oceanography 46, no. 10 (2016): 3165–80. http://dx.doi.org/10.1175/jpo-d-16-0132.1.

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AbstractBased on a high-resolution (0.1° × 0.1°) regional ocean model covering the entire northern Pacific, this study investigated the seasonal and interannual variability of the Indonesian Throughflow (ITF) and the South China Sea Throughflow (SCSTF) as well as their interactions in the Sulawesi Sea. The model efficiency in simulating the general circulations of the western Pacific boundary currents and the ITF/SCSTF through the major Indonesian seas/straits was first validated against the International Nusantara Stratification and Transport (INSTANT) data, the OFES reanalysis, and results f

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Hodkinson, R. A., and D. S. Cronan. "Regional and depth variability in the composition of cobalt-rich ferromanganese crusts from the SOPAC area and adjacent parts of the central equatorial Pacific." Marine Geology 98, no. 2-4 (1991): 437–47. http://dx.doi.org/10.1016/0025-3227(91)90115-k.

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Schroeder, Isaac D., Jarrod A. Santora, Steven J. Bograd, et al. "Source water variability as a driver of rockfish recruitment in the California Current Ecosystem: implications for climate change and fisheries management." Canadian Journal of Fisheries and Aquatic Sciences 76, no. 6 (2019): 950–60. http://dx.doi.org/10.1139/cjfas-2017-0480.

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Elucidating connections between ocean climate variability and change and recruitment of juvenile fishes to adult populations is critical for understanding variability in stock–recruit dynamics. Recruitment to adult rockfish populations in the California Current Ecosystem (CCE) is highly variable, leading to short- and long-term changes in abundance, productivity, forage availability, and potential fisheries yield. We used regional ocean model output, oceanographic data, and a 34-year time series of pelagic juvenile rockfish to investigate the interaction between changes in CCE source waters, a

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Varona, Humberto L., Julia Araujo, Moacyr Araujo, and Marcus Silva. "Idealized hydrodynamical numerical model dataset with no-river runoff at the western tropical North Atlantic." Open Research Europe 3 (April 28, 2023): 67. http://dx.doi.org/10.12688/openreseurope.15747.1.

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The western tropical North Atlantic (WTNA) is a very complex region, with the influence of intense western boundary currents in connection with equatorial zonal currents, important atmospheric forcings (e.g Intertropical Convergence Zone), mesoscale activities (e.g NBC rings), and the world’s largest river discharge as the Amazon River runoff. The volume discharge is equivalent to more than one-third of the Atlantic river freshwater input, with a plume that spreads over the region reaching the northwestward Caribbean Sea and eastward longitudes of 30°W, and influencing from physical to biologi

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Geert, Konert, Abdulkader M. Afifi, Sa’id A. Al-Hajri, and Henk J. Droste. "Paleozoic Stratigraphy and Hydrocarbon Habitat of the Arabian Plate." GeoArabia 6, no. 3 (2001): 407–42. http://dx.doi.org/10.2113/geoarabia0603407.

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ABSTRACT The Paleozoic section became prospective during the early 1970s when the enormous gas reserves in the Permian Khuff reservoirs were delineated in the Gulf and Zagros regions, and oil was discovered in Oman. Since then, frontier exploration has targeted the Paleozoic System throughout the Middle East, driven by various economic considerations. The Paleozoic sequences were essentially deposited in continental to deep marine clastic environments at the Gondwana continental margin. Carbonates only became dominant in the Late Permian. The sediments were deposited in arid to glacial setting

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Hughes, Geraint Wyn ap Gwilym, Osman Varol, and Mokhtar Al-Khalid. "Late Oxfordian micropalaeontology, nannopalaeontology and palaeoenvironments of Saudi Arabia." GeoArabia 13, no. 2 (2008): 15–46. http://dx.doi.org/10.2113/geoarabia130215.

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ABSTRACT The Hanifa Formation in Saudi Arabia consists of a succession of carbonates, over 100 m thick, that were deposited during the Late Jurassic in an equatorial position on the west flank of the Neo-Tethys Ocean. It consists of the Hawtah and overlying Ulayyah members, each of which is considered as a third-order depositional sequence. The Hawtah Member is assigned an ?Early to Mid-Oxfordian age, based on brachiopod, nautiloid and coccolith evidence; ammonite, nautiloid, coccolith and foraminiferal evidence indicate a Late Oxfordian age for the Ulayyah Member. A detailed study of the micr

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Reineman, Benjamin D., Luc Lenain, and W. Kendall Melville. "The Use of Ship-Launched Fixed-Wing UAVs for Measuring the Marine Atmospheric Boundary Layer and Ocean Surface Processes." Journal of Atmospheric and Oceanic Technology 33, no. 9 (2016): 2029–52. http://dx.doi.org/10.1175/jtech-d-15-0019.1.

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AbstractThe deployment and recovery of autonomous or remotely piloted platforms from research vessels have become a way of significantly extending the capabilities and reach of the research fleet. This paper describes the use of ship-launched and ship-recovered Boeing–Insitu ScanEagle unmanned aerial vehicles (UAVs). The UAVs were instrumented to characterize the marine atmospheric boundary layer (MABL) structure and dynamics, and to measure ocean surface processes during the October 2012 Equatorial Mixing (EquatorMix) experiment in the central Pacific and during the July 2013 Trident Warrior

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Pérez-Cruz, Ligia. "Climate and ocean variability during the middle and late Holocene recorded in laminated sediments from Alfonso Basin, Gulf of California, Mexico." Quaternary Research 65, no. 3 (2006): 401–10. http://dx.doi.org/10.1016/j.yqres.2006.02.003.

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AbstractA laminated sequence (core BAP96-CP 24°38.12′N, 110°33.24′W; 390 m depth) from the Alfonso Basin in Bay of La Paz, southern Gulf of California, contains a record of paleoceanographic and paleoclimatic changes of the past 7900 yr. Radiolarian assemblages and magnetic susceptibility are used as proxies of oceanographic and climatic variability. The records provide a regional scenario of the middle and late Holocene, suggesting two major climatic regimes and several millennial-scale events. Conditions relatively warmer and drier than today occurred from ∼7700 to 2500 cal yr BP, promoting

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Ascough, Philippa, Gordon Cook, and Andrew Dugmore. "Methodological approaches to determining the marine radiocarbon reservoir effect." Progress in Physical Geography: Earth and Environment 29, no. 4 (2005): 532–47. http://dx.doi.org/10.1191/0309133305pp461ra.

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The marine radiocarbon reservoir effect is an offset in 14C age between contemporaneous organisms from the terrestrial environment and organisms that derive their carbon from the marine environment. Quantification of this effect is of crucial importance for correct calibration of the 14C ages of marine-influenced samples to the calendrical timescale. This is fundamental to the construction of archaeological and palaeoenvironmental chronologies when such samples are employed in 14C analysis. Quantitative measurements of temporal variations in regional marine reservoir ages also have the potenti

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Butt, Jeff, and Eric Lindstrom. "Currents off the east coast of New Ireland, Papua New Guinea, and their relevance to regional undercurrents in the western equatorial Pacific Ocean." Journal of Geophysical Research 99, no. C6 (1994): 12503. http://dx.doi.org/10.1029/94jc00399.

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Goodwin, Deborah S., Amy N. S. Siuda, and Jeffrey M. Schell. "In situ observation of holopelagic Sargassum distribution and aggregation state across the entire North Atlantic from 2011 to 2020." PeerJ 10 (September 22, 2022): e14079. http://dx.doi.org/10.7717/peerj.14079.

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Between 2011 and 2020, 6,790 visual observations of holopelagic Sargassum were recorded across the North Atlantic Ocean to describe regional distribution, presence, and aggregation state at hourly and 10 km scales. Influences of oceanographic region and wind/sea conditions as well as temporal trends were considered; marine megafauna associates documented the ecological value of aggregations. Holopelagic Sargassum was present in 64% of observations from the western North Atlantic. Dispersed holopelagic Sargassum fragments and clumps were found in 97% of positive observations whereas aggregated

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Figueroa, DF. "Environmental forcing on zooplankton distribution in the coastal waters of the Galápagos Islands: spatial and seasonal patterns in the copepod community structure." Marine Ecology Progress Series 661 (March 4, 2021): 49–69. http://dx.doi.org/10.3354/meps13617.

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The oceanographic setting of the Galápagos Archipelago results in a spatially diverse marine environment suitable for a variety of species with different climatic requirements. The goal of this study is to demonstrate that the community of zooplankton in the Galápagos is highly structured by regional differences in productivity patterns and advective sources. Results are mostly based on biodiversity patterns of the copepod community collected over the Galápagos shelf between 2004 and 2006. Two contrasting marine environments were observed: a nutrient-rich upwelling system with a shallow mixed

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Mârza, Ana-Cristina, Laurie Menviel, and Luke C. Skinner. "Towards the construction of regional marine radiocarbon calibration curves: an unsupervised machine learning approach." Geochronology 6, no. 4 (2024): 503–19. http://dx.doi.org/10.5194/gchron-6-503-2024.

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Abstract. Radiocarbon may serve as a powerful dating tool in palaeoceanography, but its accuracy is limited by the need to calibrate radiocarbon dates to calendar ages. A key problem is that marine radiocarbon dates must be corrected for past offsets from either the contemporary atmosphere (i.e. “reservoir age” offsets) or a modelled estimate of the global average surface ocean (i.e. delta-R offsets). This presents a challenge because the spatial distribution of reservoir ages and delta-R offsets can vary significantly, particularly over periods of major marine hydrographic and/or carbon cycle

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McGregor, Shayne, Alexander Sen Gupta, and Matthew H. England. "Constraining Wind Stress Products with Sea Surface Height Observations and Implications for Pacific Ocean Sea Level Trend Attribution*." Journal of Climate 25, no. 23 (2012): 8164–76. http://dx.doi.org/10.1175/jcli-d-12-00105.1.

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Abstract A number of global surface wind datasets are available that are commonly used to examine climate variability or trends and as boundary conditions for ocean circulation models. However, discrepancies exist among these products. This study uses observed Archiving, Validation, and Interpretation of Satellite Oceanographic (AVISO) sea surface height anomalies (SSHAs) as a means to help constrain the fidelity of these products in the tropical region. Each wind stress product is used to force a linear shallow water model (SWM) and the resulting hindcast thermocline depth anomalies are conve

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Bunzel, Dorothea, Gerhard Schmiedl, Sebastian Lindhorst, et al. "A multi-proxy analysis of Late Quaternary ocean and climate variability for the Maldives, Inner Sea." Climate of the Past 13, no. 12 (2017): 1791–813. http://dx.doi.org/10.5194/cp-13-1791-2017.

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Abstract. As a natural sediment trap, the marine sediments of the sheltered central part of the Maldives Inner Sea represent an exceptional archive for paleoenvironmental and climate changes in the equatorial Indian Ocean. To evaluate the complex interplay between high-latitude and monsoonal climate variability, related dust fluxes, and regional oceanographic responses, we focused on Fe ∕ Al, Ti ∕ Al and Si ∕ Ca ratios as proxies for terrigenous sediment delivery and total organic carbon (TOC) and Br XRF counts as proxies for marine productivity. Benthic foraminiferal fauna distributions, grai

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Gabioux, Mariela Gabioux, Vladimir Santos Da Costa, João Marcos Azevedo Correia de Souza, Bruna Faria de Oliveira, and Afonso De Moraes Paiva. "MODELING THE SOUTH ATLANTIC OCEAN FROM MEDIUM TO HIGH-RESOLUTION." Revista Brasileira de Geofísica 31, no. 2 (2013): 229. http://dx.doi.org/10.22564/rbgf.v31i2.291.

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ABSTRACT. The standard REMO (a Brazilian approach towards operational oceanography) model configuration is tested, and results of two numerical simulations with HYCOM are presented and discussed. This configuration consists basically of a high-resolution eddy-resolving, 1/12 degree model for the Metarea V (latitudes from 7◦N to 35◦50’S, and longitudes between 20◦W and the Brazilian coast), nested in a medium-resolution eddy-permitting, 1/4 degree model of the Atlantic Ocean. These simulations aim for: a) creating a basic set-up for implementation of assimilation techniques leading to ocean pre

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Roemmich, Dean, Michele Morris, W. R. Young, and J. R. Donguy. "Fresh Equatorial Jets." Journal of Physical Oceanography 24, no. 3 (1994): 540–58. http://dx.doi.org/10.1175/1520-0485(1994)024<0540:fej>2.0.co;2.

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