Investigation of the Brazil Current front variability from altimeter data

Goñi, Gustavo; Wainer, Ilana

doi:10.1029/2000jc000396

Cited by 67 publications

(89 citation statements)

References 30 publications

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“… Identify permanent boundary currents and fronts, describe their persistence and recurrence and their relation to large-scale transports [58], [59] and [60].…”

Section: High Density Transectsmentioning

confidence: 99%

The Ship of Opportunity Program

Goñi¹

2010

Proceedings of OceanObs'09: Sustained Ocean Observations and Information for Society

105

124

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The Ship Of Opportunity Program (SOOP) is an international World Meteorological Organization (WMO)-IntergovernmentalOceanographic Commission (IOC) program that addresses both scientific and operational goals to contribute to building a sustained ocean observing system. The SOOP main mission is the collection of upper ocean temperature profiles using eXpendable BathyThermographs (XBTs), mostly from volunteer vessels. The XBT deployments are designated by their spatial and temporal sampling goals or modes of deployment (Low Density, Frequently Repeated, and High Density) and sample along well-observed transects, on either large or small spatial scales, or at special locations such as boundary currents and chokepoints, all of which are complementary to the Argo global broad scale array. A multi-national review of the global upper ocean thermal networks carried out in 1999 [1] and presented at the OceanObs'99 conference recommended evolving from broad-scale XBT sampling to increased spatial and temporal transect-based sampling anticipating the implementation of the Argo float network and continued satellite altimetry observations. The objective of the present manuscript is to review the present status of networks against the objectives set during OceanObs'99, to present key scientific contributions of XBT observations, and to offer new perspectives for the future of the XBT network. The commercial shipping industry has changed in the past decade, toward fewer routes and more frequent changes of ships and routing impacting the temporal continuity of some XBT transects. In spite of these changes, many routes now have, in addition to XBT sampling, measurements from ThermoSalinoGraphs (TSGs), eXpendable Conductivity Temperature and Depth (XCTD), partial pressure of CO 2 , Acoustic Doppler Current Profiler (ADCP), Continuous Plankton Recorders (CPR), marine meteorology, fluorescence, and radiometer sensors. In addition, recent studies of the XBT fall rate are being evaluated

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“… Identify permanent boundary currents and fronts, describe their persistence and recurrence and their relation to large-scale transports [58], [59] and [60].…”

Section: High Density Transectsmentioning

confidence: 99%

The Ship of Opportunity Program

Goñi¹

2010

Proceedings of OceanObs'09: Sustained Ocean Observations and Information for Society

105

124

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“…On the other hand, the εh 1 has the same meaning as η s in Equation (4), and this illustrates that the steric component of the SLA in the two-layer ocean model is only caused by the fluctuations of the interface (main pycnocline). However, the effect of near-surface density flux is not considered in this model.…”

Section: Methodsmentioning

confidence: 89%

Evaluation of Satellite-Altimetry-Derived Pycnocline Depth Products in the South China Sea

Chen

et al. 2017

Remote Sensing

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Abstract:The climatological monthly gridded World Ocean Atlas 2013 temperature and salinity data and satellite altimeter sea level anomaly data are used to build two altimeter-derived high-resolution real-time upper layer thickness products based on a highly simplified two-layer ocean model of the South China Sea. One product uses the proportional relationship between the sea level anomaly and upper layer thickness anomaly. The other one adds a modified component (η M ) to account for the barotropic and thermodynamic processes that are neglected in the former product. The upper layer thickness, in this work, represents the depth of the main pycnocline, which is defined as the thickness from the sea surface to the 25 kg/m 3 isopycnal depth. The mean upper layer thickness in the semi-closed South China Sea is~120 m and the mean reduced gravity is~0.073 m/s 2 , which is about one order of magnitude larger than the value obtained in the open deep ocean. The long-term temperature observations from three moored buoys, the conductivity-temperature-depth profiles from three joint cruises, and the Argo measurements from 2006 to 2015 are used to compare and evaluate these two upper layer thickness products. It shows that adding the η M component is necessary to simulate the upper layer thickness in some situations, especially in summer and fall in the northern South China Sea.

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“…We present examples that indicate agreement between remote sensing and in situ observations, and point out the potential of using continuous real-time satellite altimetry for detecting, monitoring and improving our understanding of mesoscale phenomena in a remote region that is beyond the present coverage of microwave-derived sea surface temperature and is often covered by clouds, which obscure visible and infrared imagery. FMC appears as a very low eddy energy region (Goni and Wainer, 2001), suggesting that the current stabilises downstream, presumably as it is steered by the steep bottom topography along the western edge of the Argentine Basin. CTD (Conductivity-Temperature-Depth) data collected by the Fisheries Department of the Falkland Islands on a crisscross grid across the FMC in July 1999 gave a first indication of the presence of eddies embedded in the current (Glorioso, 2002).…”

Section: Introductionmentioning

confidence: 99%