Quality Control and Interpolations of WOCE-TOGA Drifter Data

Hansen, Donald V.; Poulain, Pierre-Marie

doi:10.1175/1520-0426(1996)013<0900:qcaiow>2.0.co;2

Cited by 327 publications

(199 citation statements)

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“…When this happens, there are relatively large errors in longitude, with much smaller latitudinal errors. Additional errors can arise due to satellite instrumental noise and inaccuracies in orbit and time coding (Hansen and Poulain, 1996). From a 70 day time series of position fixes for a grounded drifter in Honolulu, Hawaii, we have calculated the root-mean-square error in a fix to be 630 m zonally, 270 m meridionally.…”

Section: B Deploymentmentioning

confidence: 99%

“…To eliminate the more egregious errors in raw Argos fixes, the DAC applies a two-step quality control scheme (Hansen and Poulain, 1996). In this methodology, the velocity is calculated via finite differencing of the raw fixes both forward and backward in time.…”

Section: A Quality Controlmentioning

confidence: 99%

“…The raw fixes are interpolated to uniform 6-h intervals using an optimal interpolation procedure known as kriging (Hansen and Herman, 1989;Hansen and Poulain, 1996). Latitude and longitude (and SST) are interpolated independently.…”

Section: B Interpolationmentioning

confidence: 99%

“…For this, Hansen and Poulain (1996) used a fractional Brownian model that can describe motion ranging from uncorrelated Brownian diffusion to perfectly correlated linear advection.…”

Section: B Interpolationmentioning

confidence: 99%

“…As noted by Hansen and Poulain (1996), the structure functions used in the kriging interpo-lation are derived from tropical Pacific observations and assume uncorrelated zonal and meridional speeds. At high latitudes, these velocity components are often correlated due to looping motion in mesoscale eddies and inertial oscillations.…”

Section: The Futurementioning

confidence: 99%

See 4 more Smart Citations

Measuring surface currents with Surface Velocity Program drifters: the instrument, its data, and some recent results

Lumpkin¹,

Pazos²

2007

Lagrangian Analysis and Prediction of Coastal and Ocean Dynamics

288

275

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Section: B Deploymentmentioning

confidence: 99%

Section: A Quality Controlmentioning

confidence: 99%

Section: B Interpolationmentioning

confidence: 99%

“…For this, Hansen and Poulain (1996) used a fractional Brownian model that can describe motion ranging from uncorrelated Brownian diffusion to perfectly correlated linear advection.…”

Section: B Interpolationmentioning

confidence: 99%

Section: The Futurementioning

confidence: 99%

See 3 more Smart Citations

Measuring surface currents with Surface Velocity Program drifters: the instrument, its data, and some recent results

Lumpkin¹,

Pazos²

2007

Lagrangian Analysis and Prediction of Coastal and Ocean Dynamics

288

275

View full text Add to dashboard Cite

Surface exchange between the Weddell and Scotia Seas

Thompson

Youngs

2013

Geophys. Res. Lett.

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Within Drake Passage, the southern flank of the Antarctic Circumpolar Current (ACC) hosts the ventilation of deep water, the injection of Antarctic shelf waters and interactions between westward and eastward boundary currents. This exchange is explored through the trajectories of forty surface drifters released in January 2012 in the northwestern Weddell Sea. The drifters detail Lagrangian transport pathways between the eastern Antarctic Peninsula and sites of elevated chlorophyll in the Scotia Sea. ACC frontal currents, in particular the Southern ACC Front, act as dynamical transport barriers to the drifters and influence surface chlorophyll distributions, indicating that ACC fronts partition Weddell source waters in the Scotia Sea. Interannual fluctuations in surface chlorophyll in the south Scotia Sea and the northern Weddell Sea covary. This suggests that Scotia Sea ecosystem dynamics are linked to water properties injected from the tip of the Antarctic Peninsula and respond to Weddell Gyre circulation changes.

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The pathways and properties of the Amazon River Plume in the tropical North Atlantic Ocean

et al. 2013

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we investigate the pathways and properties of the plume. Four plume pathways for export of freshwater from the western tropical North Atlantic are identified. These consist of direct and indirect pathways to the northwest, and eastward pathways toward the subtropical gyre and toward Africa in the North Equatorial Counter Current. Because of the seasonality and cooccurrence of these pathways, plume characteristics are highly variable. Two pathways export water to the Caribbean, however the time scales associated with those direct and indirect pathways (3 versus 61 months) differ, leading to different salinity characteristics of the plume water. Models results show that the Amazon river and tropical precipitation have similar magnitude impact on the observed seasonal cycle of freshwater within the western tropical Atlantic and at the 8 N, 38 W PIRATA mooring. Freshwater associated with the Amazon also influences surface salinity in winter as far as 20W in the model. The mean plume salinity minimum leads maximum discharge, highlighting the importance of currents and advection rather than discharge in maintaining plume properties. Plume pathways are tied to the underlying current structure, with the North Equatorial Counter Current jet preventing direct freshwater transport into the southern hemisphere. The plume influences underlying currents as well, generating vertical current shear that leads to enhanced eddy stirring and mixing in the model simulations.

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Quality Control and Interpolations of WOCE-TOGA Drifter Data

Cited by 327 publications

References 0 publications

Measuring surface currents with Surface Velocity Program drifters: the instrument, its data, and some recent results

Measuring surface currents with Surface Velocity Program drifters: the instrument, its data, and some recent results

Surface exchange between the Weddell and Scotia Seas

The pathways and properties of the Amazon River Plume in the tropical North Atlantic Ocean

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