Differences in drift behavior between drogued and undrogued satellite‐tracked drifting buoys

Brügge, B.; Dengg, Joachim

doi:10.1029/90jc02667

Cited by 14 publications

(3 citation statements)

References 23 publications

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“…Since the timing of drogue loss is uncertain, drifters found with drogues lost were archived as having drogue-depth equal zero. As in Pazan and Niiler (2001) and Brugge and Dengg (1991), sensitivity tests were conducted on the statistics resulting from both drogued and undrogued units in order to investigate the potential biases associated with this problem. The general conclusions regarding pathways and transit times still hold.…”

Section: Discussionmentioning

confidence: 99%

Drifter observations of the Gulf of Maine Coastal Current

Manning

McGillicuddy

Pettigrew

et al. 2009

Continental Shelf Research

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Two-hundred and twenty seven satellite-tracked drifters were deployed in the Gulf of Maine (GoM) from 1988 to 2007, primarily during spring and summer. The archive of tracks includes over 100,000 kilometers logged thus far. Statistics such as transit times, mean velocities, response to wind events, and preferred pathways are compiled for various areas of the coastal GoM. We compare Lagrangian flow with Eulerian estimates from near-by moorings and evaluate drifter trajectories using Ekman theory and 3-D ocean circulation models. Results indicate that the Gulf of Maine Coastal Current is a strong and persistent feature centered on the 94 ± 23 meter isobath, but that particles: a) deviate from the seasonal-mean core fairly regularly, and are often re-entrained; b) follow a slower (9 cm/s), less-constrained path in the western portion off the coast of Maine relative to the eastern (16 cm/s) section; and c) can be affected by wind events and small scale baroclinic structures. Residence times calculated for each ½ degree grid cell throughout the GoM depict some regions (Eastern Maine and Western Nova Scotia) as being relatively steady, flow-through systems, while others (Penobscot, Great South Channel) have more variable, branching pathways. Travel times for drifters that are retained within the coastal current along the entire western side of the Gulf of Maine are typically less than two months (55 days).

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Section: Discussionmentioning

confidence: 99%

Drifter observations of the Gulf of Maine Coastal Current

Manning

McGillicuddy

Pettigrew

et al. 2009

Continental Shelf Research

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“…For reliable estimates of weak mean flow (<1 cm s' 1 ) using drogued buoy tracks it is important to ascertain that the droguing is attached and effective. Dramatic reductions in data sets can occur when account is taken for different drift behaviour between drogued and undrogued buoys (Brugge & Dengg, 1991), which may be further reduced when droguing effectiveness is also considered. Although several of the buoys had drogue sensors, decisions on whether to discard the data were made on the basis of increased levels of inertial accelerations as sometimes drogue sensors can give misleading results (i.e.…”

Section: Methodsmentioning

confidence: 99%

The Eastern Subtropical Gyre (North Atlantic): Flow Rings Recirculations Structure and Subduction

Pingree

1997

J. Mar. Biol. Ass.

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Thirteen carefully prepared drogued buoy assemblies have been deployed in the eastern subtropical North Atlantic giving -20 buoy years of Lagrangian data at a depth of 200 m. The buoy results together with hydrography have revealed the structure of the eastward flowing Azores Current (AC). The main jet had a transport of 26 Sv (near 28°W) with compensating counterflows in March 1992. Jet and counterflows were readily seen in the ADCP current structure and evident in the upper layer temperature (salinity) structure on an isopycnal surface. Buoys and hydrography showed that the adjacent westward flowing counterflows resulted in recirculation both north (anticlockwise circulation) and south (clockwise circulation) of the AC -the Subtropical Recirculations. South-south-west flow (3 cm s' 1 ) occurred in the central region of study west of the Canary Islands. The longterm movement measured in the south or northern North Equatorial Current region was 3-5 cm s" 1 west-south-west. The mean south displacement per year of the buoys was 2-2° of latitude to the south and most of this displacement occurred in the first half of the year (February-August). The maximum westward displacement rate occurred six months later in October and November. The Subtropical Front/ Azores Current region was identified as a zone of increased levels of kinetic energy (>100 cm 2 s' 2 ) at a latitude near 34°N at the 200 m level, stretching for >2000 km, and as a marked horizontal winter sea surface temperature contrast at a latitude near 36°N. Winter mixing created an outcropping region of water with density in the range 26-4

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“…[12] It is not uncommon for drifters to lose their tethered drogue, and understanding the behavior of drogued and undrogued drifters has been the focus of a number of studies [Brugge and Dengg, 1991;Pazan, 1997;Pazan and Niiler, 2001;Poulain et al, 2009].…”

Section: Methodsmentioning

confidence: 99%

On the surface circulation in the western Coral Sea and residence times in the Great Barrier Reef

Choukroun¹,

Ridd²,

Brinkman³

et al. 2010

J. Geophys. Res.

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[1] Surface velocity observations from satellite tracked drifters made between 1987 and 2008 were used to resolve the surface circulation of the western Coral Sea, west of 158°E, and the Great Barrier Reef (GBR). The mean surface current map depicts well the major circulation patterns of the region, such as the position of the north Vanuatu and north Caledonia jets (NVJ and NCJ) and the western boundary currents. The North Queensland Current (NQC) and the East Australian Current (EAC) are well defined, flowing at speeds greater than 50 cm s −1 to the north, south of 15°S and 19°S, respectively. The NQC/EAC is mainly formed by the NVJ/NCJ flows, respectively. The presence of the Queensland Plateau greatly affects the westward flow, causing a zone of weak and highly variable currents that extends from 15°S to 18°S between the Queensland Plateau and the GBR shelf. Of the 235 drifters that crossed the western Coral Sea, 75 entered the GBR. Analysis of the drifter trajectories inside the GBR reveals the presence of a northwestward circulation at speeds of 22 cm s −1 north of 18°S and 0.5 cm s −1 south of 18°S. Drifter travel times used to evaluate the water residence times within the GBR indicate residence times of a few weeks for most of the lagoon.

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Differences in drift behavior between drogued and undrogued satellite‐tracked drifting buoys

Cited by 14 publications

References 23 publications

Drifter observations of the Gulf of Maine Coastal Current

Drifter observations of the Gulf of Maine Coastal Current

The Eastern Subtropical Gyre (North Atlantic): Flow Rings Recirculations Structure and Subduction

On the surface circulation in the western Coral Sea and residence times in the Great Barrier Reef

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