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Journal articles on the topic 'Drifters'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Lumpkin, Rick, Nikolai Maximenko, and Mayra Pazos. "Evaluating Where and Why Drifters Die*." Journal of Atmospheric and Oceanic Technology 29, no. 2 (2012): 300–308. http://dx.doi.org/10.1175/jtech-d-11-00100.1.

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Abstract NOAA ’s Global Drifter Program (GDP) manages a global array of ~1250 active satellite-tracked surface drifting buoys (“drifters”) in collaboration with numerous national and international partners. To better manage the drifter array and to assess the performance of various drifter manufacturers, it is important to discriminate between drifters that cease transmitting because of internal failure and those that cease because of external factors such as running aground or being picked up. An accurate assessment of where drifters run aground would also allow the observations to be used to

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2

Morey, Steven, Nicolas Wienders, Dmitry Dukhovskoy, and Mark Bourassa. "Measurement Characteristics of Near-Surface Currents from Ultra-Thin Drifters, Drogued Drifters, and HF Radar." Remote Sensing 10, no. 10 (2018): 1633. http://dx.doi.org/10.3390/rs10101633.

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Concurrent measurements by satellite tracked drifters of different hull and drogue configurations and coastal high-frequency radar reveal substantial differences in estimates of the near-surface velocity. These measurements are important for understanding and predicting material transport on the ocean surface as well as the vertical structure of the near-surface currents. These near-surface current observations were obtained during a field experiment in the northern Gulf of Mexico intended to test a new ultra-thin drifter design. During the experiment, thirty small cylindrical drifters with 5

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3

Haza, A. C., E. D’Asaro, H. Chang, et al. "Drogue-Loss Detection for Surface Drifters during the Lagrangian Submesoscale Experiment (LASER)." Journal of Atmospheric and Oceanic Technology 35, no. 4 (2018): 705–25. http://dx.doi.org/10.1175/jtech-d-17-0143.1.

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AbstractThe Lagrangian Submesoscale Experiment (LASER) was designed to study surface flows during winter conditions in the northern Gulf of Mexico. More than 1000 mostly biodegradable drifters were launched. The drifters consisted of a surface floater extending 5 cm below the surface, containing the satellite tracking system, and a drogue extending 60 cm below the surface, hanging beneath the floater on a flexible tether. On some floats, the drogue separated from the floater during storms. This paper describes methods to detect drogue loss based on two properties that distinguish drogued from

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Suara, Kabir, Charles Wang, Yanming Feng, Richard J. Brown, Hubert Chanson, and Michael Borgas. "High-Resolution GNSS-Tracked Drifter for Studying Surface Dispersion in Shallow Water." Journal of Atmospheric and Oceanic Technology 32, no. 3 (2015): 579–90. http://dx.doi.org/10.1175/jtech-d-14-00127.1.

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AbstractThe use of Global Navigation Satellite System (GNSS)-tracked Lagrangian drifters allows more realistic quantification of fluid motion and dispersion coefficients than Eulerian techniques because such drifters are analogs of particles that are relevant to flow field characterization and pollutant dispersion. Using the fast-growing real-time kinematic (RTK) positioning technique derived from GNSS, drifters are developed for high-frequency (10 Hz) sampling with position estimates with centimeter accuracy. The drifters are designed with small size and less direct wind drag to follow the su

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5

Aravind, H. M., Helga S. Huntley, A. D. Kirwan, and Michael R. Allshouse. "Drifter Deployment Strategies to Determine Lagrangian Surface Convergence in Submesoscale Flows." Journal of Atmospheric and Oceanic Technology 41, no. 1 (2024): 95–112. http://dx.doi.org/10.1175/jtech-d-22-0129.1.

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Abstract Surface convergence in the ocean is associated with accumulation of buoyant pollutants as well as with vertical transport that is important to biological activity. Such surface convergence regions are marked by a high dilation rate, i.e., the finite time Lagrangian average divergence. Dilation-rate observations are most easily derived from the change of the area encompassed by a drifter swarm over time. The technological advances that have enabled the deployment of large numbers of drifters in a single experiment have raised new questions about optimal deployment strategies for extrac

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Pawlowicz, Rich, Cédric Chavanne, and Dany Dumont. "The Water-Following Performance of Various Lagrangian Surface Drifters Measured in a Dye Release Experiment." Journal of Atmospheric and Oceanic Technology 41, no. 1 (2024): 45–63. http://dx.doi.org/10.1175/jtech-d-23-0073.1.

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Abstract Many different surface drifter designs have been developed recently to track near-surface ocean currents, but the degree to which these drifters slip through the water because of mechanisms associated with the wind is poorly known. In the 2020 Tracer Release Experiment (TReX), 19 drifters of eight different designs, both commercially available and home-built, were simultaneously released with a patch of rhodamine dye. The dye rapidly spread vertically through the mixed layer but also more slowly dispersed horizontally. Although winds were light, drifters moved downwind from the dye pa

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Spydell, Matthew S., Falk Feddersen, and Jamie Macmahan. "The Effect of Drifter GPS Errors on Estimates of Submesoscale Vorticity." Journal of Atmospheric and Oceanic Technology 36, no. 11 (2019): 2101–19. http://dx.doi.org/10.1175/jtech-d-19-0108.1.

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AbstractDifferential kinematic flow properties (DKP), such as vertical vorticity, have been estimated from surface drifters. However, previous DKP error estimates were a posteriori and did not include correlated errors across drifters. To accurately estimate submesoscale (≤1 km) DKPs from drifters, errors must be better understood. Here, the a priori vorticity standard error is derived that depends upon the number of drifters in the cluster, the drifter cluster major and minor axes lengths, the instrument velocity error, and the cross-drifter error correlation. Two stationary GPS experiments,

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8

Hormann, Verena, Luca R. Centurioni, and Gilles Reverdin. "Evaluation of Drifter Salinities in the Subtropical North Atlantic." Journal of Atmospheric and Oceanic Technology 32, no. 1 (2015): 185–92. http://dx.doi.org/10.1175/jtech-d-14-00179.1.

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AbstractSalinity measurements from drifters constitute an important in situ dataset for the calibration and validation of the sea surface salinity satellite missions. A total of 114 satellite-tracked salinity drifters were deployed within the framework of the first Salinity Processes in the Upper Ocean Regional Study (SPURS) experiment in the subtropical North Atlantic focusing on the period August 2012–April 2014. In this study, a subset of 83 drifters, which provided useful salinity measurements in the central SPURS region from a few weeks to more than one year, is evaluated and an ad hoc qu

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9

Poulain, Pierre-Marie, Riccardo Gerin, Elena Mauri, and Romain Pennel. "Wind Effects on Drogued and Undrogued Drifters in the Eastern Mediterranean." Journal of Atmospheric and Oceanic Technology 26, no. 6 (2009): 1144–56. http://dx.doi.org/10.1175/2008jtecho618.1.

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Abstract The wind effects on drogued and undrogued drifters are assessed using Coastal Ocean Dynamics Experiment (CODE) and Surface Velocity Program (SVP) drifter datasets and ECMWF wind products in the eastern Mediterranean. Complex and real linear regression models are used to estimate the relative slip of undrogued SVP drifters and to extract the wind-driven currents from the drifter velocities. The frequency response of the wind-driven currents is studied using cross-spectral analysis. By comparing the velocities of cotemporal and nearly collocated undrogued and drogued SVP drifters, it ap

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10

Lumpkin, Rick, Luca Centurioni, and Renellys C. Perez. "Fulfilling Observing System Implementation Requirements with the Global Drifter Array." Journal of Atmospheric and Oceanic Technology 33, no. 4 (2016): 685–95. http://dx.doi.org/10.1175/jtech-d-15-0255.1.

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AbstractThe Global Ocean Observing System (GOOS) requirements for in situ surface temperature and velocity measurements call for observations at 5° × 5° resolution. A key component of the GOOS that measures these essential climate variables is the global array of surface drifters. In this study, statistical observing system sampling experiments are performed to evaluate how many drifters are required to achieve the GOOS requirements, both with and without the presence of a completed global tropical moored buoy array at 5°S–5°N. The statistics for these simulations are derived from the evolutio

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11

Reverdin, G., S. Morisset, H. Bellenger, et al. "Near–Sea Surface Temperature Stratification from SVP Drifters." Journal of Atmospheric and Oceanic Technology 30, no. 8 (2013): 1867–83. http://dx.doi.org/10.1175/jtech-d-12-00182.1.

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Abstract This study describes how the hull temperature (Ttop) measurements from multisensor surface velocity program (SVP) drifters can be combined with other measurements to provide quantitative information on near-surface vertical temperature stratification during large daily cycles. First, Ttop is compared to the temperature measured at 17 -cm depth from a float tethered to the SVP drifter. These 2007–12 SVP drifters present a larger daily cycle by 1%–3% for 1°–2°C daily cycle amplitudes, with a maximum difference close to the local noon. The difference could result from flow around the SVP

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12

Lavrova, O. Yu, D. M. Soloviev, A. Ya Strochkov, K. R. Nazirova, E. V. Krayushkin, and E. V. Zhuk. "The use of mini-drifters in coastal current measurements conducted concurrently with satellite imaging." Исследования Земли из Космоса, no. 5 (November 5, 2019): 36–49. http://dx.doi.org/10.31857/s0205-96142019536-49.

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The results of field measurements of coastal currents using Lagrangian mini-drifters are presented. Drifter experiments were conducted concurrently with satellite imaging using Sentinel-2 MSI, Landsat-8 OLI and Sentinel-3 OLCI sensors. It is shown that the use of an inexpensive and simple to manufacture device, which is a mini-drifter, allows obtaining operational information about the parameters of coastal currents. In the experiments of April-May, 2019, in the northeastern part of the Black Sea, it was possible to estimate the velocity of coastal currents and determine the minimum distance t

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13

Schmidt, W. E., B. T. Woodward, K. S. Millikan, R. T. Guza, B. Raubenheimer, and Steve Elgar. "A GPS-Tracked Surf Zone Drifter*." Journal of Atmospheric and Oceanic Technology 20, no. 7 (2003): 1069–75. http://dx.doi.org/10.1175/1460.1.

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Abstract A drifter designed to measure surf zone circulation has been developed and field tested. Drifter positions accurate to within a few meters are estimated in real time at 0.1 Hz using the global positioning system (GPS) and a shore-to-drifter radio link. More accurate positions are estimated at 1 Hz from postprocessed, internally logged data. Mean alongshore currents estimated from trajectories of the 0.5-m-draft drifters in 1–2-m water depth agree well with measurements obtained with nearby, bottom-mounted, acoustic current meters. Drifters deployed near the base of a well-developed ri

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14

GERIN, R., V. KOURAFALOU, P. M. POULAIN, and Ş. BESIKTEPE. "Influence of Dardanelles outflow induced thermal fronts and winds on drifter trajectories in the Aegean Sea." Mediterranean Marine Science 15, no. 2 (2014): 239. http://dx.doi.org/10.12681/mms.464.

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The data provided by 12 drifters deployed in the Northern Aegean Sea in the vicinity of the Dardanelles Strait in August 2008 and February 2009 are used to explore the surface circulation of the basin and the connectivity to the Black Sea. The drifters were deployed within the Dardanelles outflow of waters of Black Sea origin in the Northeastern Aegean. Thanks to the particular choice of the drifter deployment positions, the data set provides a unique opportunity to observe the branching behaviour of the surface currents around Lemnos Island. Such pathways were notpossible to study with previo

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15

Yang, Longqi, Zhida Huang, Zhenyu Sun, and Jianyu Hu. "Surface Currents Along the Coast of the Chinese Mainland Observed by Coastal Drifters in Autumn and Winter." Marine Technology Society Journal 55, no. 5 (2021): 161–69. http://dx.doi.org/10.4031/mtsj.55.5.7.

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Abstract This paper analyzes the surface current characteristics along the coast of the Chinese mainland in autumn and winter by the trajectories of coastal drifters and remote sensing data. The results show the following: (1) During autumn and winter 2018, the paths of drifters were consistent with that of the Zhe-Min Coastal Water, while the Zhe-Min Coastal Water had a branch intruding the coast of Taiwan Island. (2) When the northeast monsoon weakened or changed direction in a short period, the Zhe-Min Coastal Water showed a reverse flow. (3) In the northeastern South China Sea, the drifter

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16

Thompson, Andrew F., Karen J. Heywood, Sally E. Thorpe, Angelika H. H. Renner, and Armando Trasviña. "Surface Circulation at the Tip of the Antarctic Peninsula from Drifters." Journal of Physical Oceanography 39, no. 1 (2009): 3–26. http://dx.doi.org/10.1175/2008jpo3995.1.

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Abstract An array of 40 surface drifters, drogued at 15-m depth, was deployed in February 2007 to the east of the tip of the Antarctic Peninsula as part of the Antarctic Drifter Experiment: Links to Isobaths and Ecosystems (ADELIE) project. Data obtained from these drifters and from a select number of local historical drifters provide the most detailed observations to date of the surface circulation in the northwestern Weddell Sea. The Antarctic Slope Front (ASF), characterized by a ∼20 cm s−1 current following the 1000-m isobath, is the dominant feature east of the peninsula. The slope front

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17

Ma, Chunyong, Siqing Li, Yang Yang, Jie Yang, and Ge Chen. "Extraction of Revolving Channels of Drifters around Mesoscale Eddy Centers Based on Spatiotemporal Trajectory Clustering." Journal of Atmospheric and Oceanic Technology 36, no. 9 (2019): 1903–16. http://dx.doi.org/10.1175/jtech-d-19-0007.1.

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The global oceanic transports of energy, plankton, and other tracers by mesoscale eddies can be estimated by combining satellite altimetry and in situ data. However, the revolving channels of particles entrained by mesoscale eddies, which could help explain the dynamic process of eddies entraining materials, are still unknown. In this study, satellite altimeter and drifter data from 1993 to 2016 are adopted, and the normalized trajectory clustering algorithm (N-TRACLUS) is proposed to extract the revolving channels of drifters. First, the trajectories of drifters are normalized and clustered b

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18

Lodise, John, Tamay Özgökmen, Annalisa Griffa, and Maristella Berta. "Vertical structure of ocean surface currents under high winds from massive arrays of drifters." Ocean Science 15, no. 6 (2019): 1627–51. http://dx.doi.org/10.5194/os-15-1627-2019.

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Abstract. Very-near-surface ocean currents are dominated by wind and wave forcing and have large impacts on the transport of buoyant materials in the ocean. Surface currents, however, are under-resolved in most operational ocean models due to the difficultly of measuring ocean currents close to, or directly at, the air–sea interface with many modern instrumentations. Here, observations of ocean currents at two depths within the first meter of the surface are made utilizing trajectory data from both drogued and undrogued Consortium for Advanced Research on Transport of Hydrocarbon in the Enviro

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Novelli, Guillaume, Cédric M. Guigand, and Tamay M. Özgökmen. "Technological Advances in Drifters for Oil Transport Studies." Marine Technology Society Journal 52, no. 6 (2018): 53–61. http://dx.doi.org/10.4031/mtsj.52.6.9.

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AbstractAdvances in drifter technology applied to oil spill studies from 1970 to the present are summarized here. Initially, drifters designed for oil spill response were intended to remotely track trajectories of accidental spills and help guide responders. Most recently, inexpensive biodegradable drifters were developed for massive deployments, making it possible to significantly improve numerical transport models and to investigate, via observations, the processes leading to dispersion and accumulation of surface pollutants across multiple scales. Over the past 50 years, drifters have benef

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20

Mardani, Neda, Mohammadreza Khanarmuei, Kabir Suara, Richard Brown, Adrian McCallum, and Roy C. Sidle. "Lagrangian Data Assimilation for Improving Model Estimates of Velocity Fields and Residual Currents in a Tidal Estuary." Applied Sciences 11, no. 22 (2021): 11006. http://dx.doi.org/10.3390/app112211006.

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Numerical models are associated with uncertainties that can be reduced through data assimilation (DA). Lower costs have driven a recent tendency to use Lagrangian instruments such as drifters and floats to obtain information about water bodies. However, difficulties emerge in their assimilation, since Lagrangian data are set out in a moving frame of reference and are not compatible with the fixed grid locations used in models to predict flow variables. We applied a pseudo-Lagrangian approach using OpenDA, an open-source DA tool to assimilate Lagrangian drifter data into an estuarine hydrodynam

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Lumpkin, Rick, Semyon A. Grodsky, Luca Centurioni, Marie-Helene Rio, James A. Carton, and Dongkyu Lee. "Removing Spurious Low-Frequency Variability in Drifter Velocities." Journal of Atmospheric and Oceanic Technology 30, no. 2 (2013): 353–60. http://dx.doi.org/10.1175/jtech-d-12-00139.1.

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Abstract Satellite-tracked drifting buoys of the Global Drifter Program have drogues, centered at 15-m depth, to minimize direct wind forcing and Stokes drift. Drogue presence has historically been determined from submergence or tether strain records. However, recent studies have revealed that a significant fraction of drifters believed to be drogued have actually lost their drogues, a problem that peaked in the mid-2000s before the majority of drifters in the global array switched from submergence to tether strain sensors. In this study, a methodology is applied to the data to automatically r

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Wu, Guoheng, Zhongyue Lu, Zirong Luo, Jianzhong Shang, Chongfei Sun, and Yiming Zhu. "Experimental Analysis of a Novel Adaptively Counter-Rotating Wave Energy Converter for Powering Drifters." Journal of Marine Science and Engineering 7, no. 6 (2019): 171. http://dx.doi.org/10.3390/jmse7060171.

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Nowadays, drifters are used for a wide range of applications for researching and exploring the sea. However, the power constraint makes it difficult for their sampling intervals to be smaller, meaning that drifters cannot transmit more accurate measurement data to satellites. Furthermore, due to the power constraint, a modern Surface Velocity Program (SVP) drifter lives an average of 400 days before ceasing transmission. To overcome the power constraint of SVP drifters, this article proposes an adaptively counter-rotating wave energy converter (ACWEC) to supply power for drifters. The ACWEC ha

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Reverdin, G., S. Morisset, J. Boutin, et al. "Validation of Salinity Data from Surface Drifters." Journal of Atmospheric and Oceanic Technology 31, no. 4 (2014): 967–83. http://dx.doi.org/10.1175/jtech-d-13-00158.1.

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Abstract Salinity measurements from 119 surface drifters in 2007–12 were assessed; 80% [Surface Velocity Program with a barometer with a salinity sensor (SVP-BS)] and 75% [SVP with salinity (SVP-S)] of the salinity data were found to be usable, after editing out some spikes. Sudden salinity jumps are found in drifter salinity records that are not always associated with temperature jumps, in particular in the wet tropics. A method is proposed to decide whether and how to correct those jumps, and the uncertainty in the correction applied. Northeast of South America, in a region influenced by the

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Licari. "Drifters." Antipodes 35, no. 1 (2021): 9. http://dx.doi.org/10.2307/48795408.

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Licari, Rosanna E. "Drifters." Antipodes 35, no. 1-2 (2021): 10–11. http://dx.doi.org/10.1353/apo.2021.0006.

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Siji, Prescilla, and Charitha Pattiaratchi. "Surface Current Observations in the Southeastern Tropical Indian Ocean Using Drifters." Journal of Marine Science and Engineering 13, no. 4 (2025): 717. https://doi.org/10.3390/jmse13040717.

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The Southeastern Tropical Indian Ocean (SETIO) forms part of the global ocean conveyor belt and thermohaline circulation that has a significant influence in controlling the global climate. This region of the ocean has very few observations using surface drifters, and this study presents, for the first time, paths of satellite tracked drifters released in the Timor Sea (123.3° E, 13.8° S). The drifter data were used to identify the ocean dynamics, forcing mechanisms and connectivity in the SETIO region. The data set has high temporal (~5 min) and spatial (~120 m) resolution and were collected o

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Ohlmann, Carter, Peter White, Libe Washburn, Brian Emery, Eric Terrill, and Mark Otero. "Interpretation of Coastal HF Radar–Derived Surface Currents with High-Resolution Drifter Data." Journal of Atmospheric and Oceanic Technology 24, no. 4 (2007): 666–80. http://dx.doi.org/10.1175/jtech1998.1.

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Abstract Dense arrays of surface drifters are used to quantify the flow field on time and space scales over which high-frequency (HF) radar observations are measured. Up to 13 drifters were repetitively deployed off the Santa Barbara and San Diego coasts on 7 days during 18 months. Each day a regularly spaced grid overlaid on a 1-km2 (San Diego) or 4-km2 (Santa Barbara) square, located where HF radar radial data are nearly orthogonal, was seeded with drifters. As drifters moved from the square, they were retrieved and replaced to maintain a spatially uniform distribution of observations within

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Gorbunov, Igor G., Vladimir I. Veremyev, Vadim D. Shestak, Gleb V. Komarov, Stanislav A. Myslenkov, and Ksenia P. Silvestrova. "Verifying Measurements of Surface Current Velocities by X-Band Coherent Radar Using Drifter Data." Journal of the Russian Universities. Radioelectronics 26, no. 3 (2023): 99–110. http://dx.doi.org/10.32603/1993-8985-2023-26-3-99-110.

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Introduction. Conventional contact measurements of hydrographic parameters frequently fail to provide the necessary accuracy of data in the field of water area monitoring. This problem can be solved using coherent radars enabling direct measurements of surface current velocities.Aim. To establish the accuracy of surface current velocities measured by a Doppler radar using drifter data.Materials and methods. In June 2022, coastal operational oceanography studies were conducted at the hydrophysical test site of the Institute of Oceanology of the Russian Academy of Sciences in the Black Sea near

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Chiswell, Stephen M. "Mean Velocity Decomposition and Vertical Eddy Diffusivity of the Pacific Ocean from Surface GDP Drifters and 1000-m Argo Floats." Journal of Physical Oceanography 46, no. 6 (2016): 1751–68. http://dx.doi.org/10.1175/jpo-d-15-0189.1.

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AbstractWith the relatively recent development of Global Drifter Program (GDP) drifters that measure the near-surface ocean velocity and Argo floats that can be used to derive both the intermediate-ocean (1000 m) velocity and the mean dynamic height of the surface relative to 1000 dbar, there now exists the opportunity to directly observe the mean velocity decomposition of the ocean. This study computes the mean Ekman velocity by subtracting the mean referenced velocity derived from Argo data from the mean surface velocity derived from GDP data. This Ekman velocity is slightly stronger than pr

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Rypina, I. I., A. R. Kirincich, R. Limeburner, and I. A. Udovydchenkov. "Eulerian and Lagrangian Correspondence of High-Frequency Radar and Surface Drifter Data: Effects of Radar Resolution and Flow Components." Journal of Atmospheric and Oceanic Technology 31, no. 4 (2014): 945–66. http://dx.doi.org/10.1175/jtech-d-13-00146.1.

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Abstract This study investigated the correspondence between the near-surface drifters from a mass drifter deployment near Martha’s Vineyard, Massachusetts, and the surface current observations from a network of three high-resolution, high-frequency radars to understand the effects of the radar temporal and spatial resolution on the resulting Eulerian current velocities and Lagrangian trajectories and their predictability. The radar-based surface currents were found to be unbiased in direction but biased in magnitude with respect to drifter velocities. The radar systematically underestimated ve

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Novelli, Guillaume, Cédric M. Guigand, Charles Cousin, et al. "A Biodegradable Surface Drifter for Ocean Sampling on a Massive Scale." Journal of Atmospheric and Oceanic Technology 34, no. 11 (2017): 2509–32. http://dx.doi.org/10.1175/jtech-d-17-0055.1.

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AbstractTargeted observations of submesoscale currents are necessary to improve science’s understanding of oceanic mixing, but these dynamics occur at spatiotemporal scales that are currently challenging to detect. Prior studies have recently shown that the submesoscale surface velocity field can be measured by tracking hundreds of surface drifters released in tight arrays. This strategy requires drifter positioning to be accurate, frequent, and to last for several weeks. However, because of the large numbers involved, drifters must be low-cost, compact, easy to handle, and also made of materi

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Edwards, K. P., F. E. Werner, and B. O. Blanton. "Comparison of Observed and Modeled Drifter Trajectories in Coastal Regions: An Improvement through Adjustments for Observed Drifter Slip and Errors in Wind Fields." Journal of Atmospheric and Oceanic Technology 23, no. 11 (2006): 1614–20. http://dx.doi.org/10.1175/jtech1933.1.

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Abstract Lagrangian particle tracking using three-dimensional (3D) numerical modeling approaches has become an important tool in coastal oceanography. In this note, an approach is described that can reduce the difference between observed and numerical drifter trajectories in the coastal ocean by including corrections to the water velocity due to differences between observed winds and the wind field used to drive the 3D circulation model and some specific characteristics of the observed drifters in the algorithm that estimate the numerical trajectory. Quantitative improvements are obtained wher

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Blockley, E. W., M. J. Martin, and P. Hyder. "Validation of FOAM near-surface ocean current forecasts using Lagrangian drifting buoys." Ocean Science 8, no. 4 (2012): 551–65. http://dx.doi.org/10.5194/os-8-551-2012.

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Abstract. In this study, the quality of near-surface current forecasts from the FOAM ocean forecasting system is assessed using the trajectories of Lagrangian drifting buoys. A method is presented for deriving pseudo-Eulerian estimates of ocean currents from the positions of Surface Velocity Program drifters and the resulting data are compared to velocities observed by the global tropical moored buoy array. A quantitative analysis of the global FOAM velocities is performed for the period 2007 and 2008 using currents derived from over 3000 unique drifters (providing an average of 650 velocity o

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Blockley, E. W., M. J. Martin, and P. Hyder. "Validation of FOAM near-surface ocean current forecasts using Lagrangian drifting buoys." Ocean Science Discussions 9, no. 2 (2012): 1705–40. http://dx.doi.org/10.5194/osd-9-1705-2012.

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Abstract. In this study, the quality of near-surface current forecasts from the FOAM ocean forecasting system is assessed using the trajectories of Lagrangian drifting buoys. A method is presented for deriving pseudo-Eulerian estimates of ocean currents from the positions of Surface Velocity Program drifters and the resulting data are compared to velocities observed by the global tropical moored buoy array. A quantitative analysis of the global FOAM velocities is performed for the period 2007 and 2008 using currents derived from over 3000 unique drifters (providing an average of 650 velocity o

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Sotillo, Marcos García, Emilio Garcia-Ladona, Alejandro Orfila, et al. "The MEDESS-GIB database: tracking the Atlantic water inflow." Earth System Science Data 8, no. 1 (2016): 141–49. http://dx.doi.org/10.5194/essd-8-141-2016.

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Abstract. On 9 September 2014, an intensive drifter deployment was carried out in the Strait of Gibraltar. In the frame of the MEDESS-4MS Project (EU MED Program), the MEDESS-GIB experiment consisted of the deployment of 35 satellite tracked drifters, mostly of CODE-type, equipped with temperature sensor sampling at a rate of 30 min. Drifters were distributed along and on both sides of the Strait of Gibraltar. The MEDESS-GIB deployment plan was designed as to ensure quasi-synoptic spatial coverage. To this end, four boats covering an area of about 680 NM2 in 6 h were coordinated. As far as the

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Sotillo, M. G., E. Garcia-Ladona, A. Orfila, et al. "The MEDESS-GIB database: tracking the Atlantic water inflow." Earth System Science Data Discussions 8, no. 2 (2015): 863–87. http://dx.doi.org/10.5194/essdd-8-863-2015.

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Abstract. On 9 September 2014, an intensive drifter deployment was carried out in the Strait of Gibraltar. In the frame of the EU MED Program MEDESS-4MS, the MEDESS-GIB experiment consisted of the deployment of 35 satellite tracked drifters, mostly of CODE-type, equipped with temperature sensor sampling at a rate of 30 min. Drifters were distributed along and on both sides of the Strait of Gibraltar. The MEDESS-GIB deployment plan was designed as to ensure quasi-synoptic spatial coverage. To this end, 4 boats covering an area of about 680 NM2 in 6 h were coordinated. As far as authors know, th

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Mullarney, Julia C., and Stephen M. Henderson. "LAGRANGIAN MEASUREMENTS OF TURBULENT DISSIPATION OVER A SHALLOW TIDAL FLAT FROM PULSE COHERENT ACOUSTIC DOPPLER PROFILERS." Coastal Engineering Proceedings 1, no. 33 (2012): 49. http://dx.doi.org/10.9753/icce.v33.currents.49.

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We present high resolution (25 mm spatial, 8 Hz temporal) profiles of velocity measured over a shallow tidal flat using pulse-coherent Acoustic Doppler Profilers mounted on surface drifters. The use of Lagrangian measurements mitigated the problem of resolving velocity ambiguities, a problem which often limits the application of high-resolution pulse-coherent profilers. Turbulent dissipation rates were estimated from second-order structure functions of measured velocity. Drifters were advected towards, and subsequently trapped on, a convergent surface front which marked the edge of a freshwate

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Merlino, Silvia, Vincenzo Calabrò, Carlotta Giannelli, et al. "The Smart Drifter Cluster: Monitoring Sea Currents and Marine Litter Transport Using Consumer IoT Technologies." Sensors 23, no. 12 (2023): 5467. http://dx.doi.org/10.3390/s23125467.

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The study of marine Lagrangian transport holds significant importance from a scientific perspective as well as for practical applications such as environmental-pollution responses and prevention (e.g., oil spills, dispersion/accumulation of plastic debris, etc.). In this regard, this concept paper introduces the Smart Drifter Cluster: an innovative approach that leverages modern “consumer” IoT technologies and notions. This approach enables the remote acquisition of information on Lagrangian transport and important ocean variables, similar to standard drifters. However, it offers potential ben

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Driessen, Miriam. "Africa Drifters." Made in China Journal 5, no. 3 (2021): 48–51. http://dx.doi.org/10.22459/mic.05.03.2020.05.

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Pearson, Jenna, Baylor Fox-Kemper, Roy Barkan, Jun Choi, Annalisa Bracco, and James C. McWilliams. "Impacts of Convergence on Structure Functions from Surface Drifters in the Gulf of Mexico." Journal of Physical Oceanography 49, no. 3 (2019): 675–90. http://dx.doi.org/10.1175/jpo-d-18-0029.1.

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AbstractThere are limitations in approximating Eulerian statistics from surface drifters, due to biases from surface convergences. By contrasting second- and third-order Eulerian and surface drifter structure functions obtained from a model of the Gulf of Mexico, the consequences of the semi-Lagrangian nature of observations during the summer Grand Lagrangian Deployment (GLAD) and winter Lagrangian Submesoscale Experiment (LASER) are estimated. By varying launch pattern and location, the robustness and sensitivity of these statistics are evaluated. Over scales less than 10 km, second-order str

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Aksamit, Nikolas O., Themistoklis Sapsis, and George Haller. "Machine-Learning Mesoscale and Submesoscale Surface Dynamics from Lagrangian Ocean Drifter Trajectories." Journal of Physical Oceanography 50, no. 5 (2020): 1179–96. http://dx.doi.org/10.1175/jpo-d-19-0238.1.

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AbstractLagrangian ocean drifters provide highly accurate approximations of ocean surface currents but are sparsely located across the globe. As drifters passively follow ocean currents, there is minimal control on where they will be making measurements, providing limited temporal coverage for a given region. Complementary Eulerian velocity data are available with global coverage but are themselveslimited by the spatial and temporal resolution possible with satellite altimetry measurements. In addition, altimetry measurements approximate geostrophic components of ocean currents but neglect sma

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George Giazitzoglu, Andreas. "Learning not to labour: a micro analysis of consensual male unemployment." International Journal of Sociology and Social Policy 34, no. 5/6 (2014): 334–48. http://dx.doi.org/10.1108/ijssp-07-2013-0083.

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Purpose – The Drifters are ten long-term unemployed British men. The Drifters’ unemployment is consensual: the men believe they have chosen to “not work” and rely upon welfare benefits for their socio-economic survival. The purpose of this paper is to present micro sociological analysis of the Drifters’ existences which focuses upon first, exploring why the Drifters’ consensual unemployment has resulted in them experiencing high levels of stigma in their everyday lives; second, analysing the Drifters’ (micro) relationships with (macro) unemployment policies. Design/methodology/approach – Prima

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Davulienė, Lina, Loreta Kelpšaitė, and Inga Dailidienė. "Surface drifters experiment in the south-eastern part of the Baltic Sea." Baltica 27, no. 2 (2014): 151–60. http://dx.doi.org/10.5200/baltica.2014.27.24.

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In November 2013, the first short-term surface drifter experiment has been carried out along the Lithuanian coast. Three drifters were deployed from R/V Vėjūnas at a location ~6 km offshore and 2.5 km north of Klaipėda. During the period of observation from 22-30 November, the drifting direction has shifted up to five times by more than 90 degrees mainly due to changes in the mean wind direction. After seven days, the drifters have reached the coast approximately 30 km south of Klaipėda. The analysis of the relationships between the mean wind speed and the mean drift speed for the three period

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Sansón, Luis Zavala, Paula Pérez-Brunius, and Julio Sheinbaum. "Surface Relative Dispersion in the Southwestern Gulf of Mexico." Journal of Physical Oceanography 47, no. 2 (2017): 387–403. http://dx.doi.org/10.1175/jpo-d-16-0105.1.

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AbstractSurface dispersion properties in the southwestern Gulf of Mexico are studied by using a set of 441 drifters released during a 7-yr period and tracked for 2 months on average. The drifters have a drogue below the surface Ekman layer, so they approximately follow oceanic currents. This study follows two different approaches: First, two-particle (or pair) statistics are calculated [relative dispersion and finite-scale Lyapunov exponents (FSLEs)]. Relative dispersion estimates are consistent with theoretical dispersion regimes of two-dimensional turbulence: an exponential growth during the

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Oscroft, Sarah, Adam M. Sykulski, and Jeffrey J. Early. "Separating Mesoscale and Submesoscale Flows from Clustered Drifter Trajectories." Fluids 6, no. 1 (2020): 14. http://dx.doi.org/10.3390/fluids6010014.

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Drifters deployed in close proximity collectively provide a unique observational data set with which to separate mesoscale and submesoscale flows. In this paper we provide a principled approach for doing so by fitting observed velocities to a local Taylor expansion of the velocity flow field. We demonstrate how to estimate mesoscale and submesoscale quantities that evolve slowly over time, as well as their associated statistical uncertainty. We show that in practice the mesoscale component of our model can explain much first and second-moment variability in drifter velocities, especially at lo

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Muscarella, Philip, Matthew J. Carrier, Hans Ngodock, et al. "Do Assimilated Drifter Velocities Improve Lagrangian Predictability in an Operational Ocean Model?" Monthly Weather Review 143, no. 5 (2015): 1822–32. http://dx.doi.org/10.1175/mwr-d-14-00164.1.

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Abstract The Lagrangian predictability of general circulation models is limited by the need for high-resolution data streams to constrain small-scale dynamical features. Here velocity observations from Lagrangian drifters deployed in the Gulf of Mexico during the summer 2012 Grand Lagrangian Deployment (GLAD) experiment are assimilated into the Naval Coastal Ocean Model (NCOM) 4D variational (4DVAR) analysis system to examine their impact on Lagrangian predictability. NCOM-4DVAR is a weak-constraint assimilation system using the indirect representer method. Velocities derived from drifter traj

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Downes, Barbara J., Alecia Bellgrove, and Jodie L. Street. "Drifting or walking? Colonisation routes used by different instars and species of lotic, macroinvertebrate filter feeders." Marine and Freshwater Research 56, no. 6 (2005): 815. http://dx.doi.org/10.1071/mf04281.

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Many views of stream invertebrate populations centre on drift as the major route of larval dispersal, but few studies have presented unambiguous information about the role of drift. We present the results from an experiment designed to determine whether the major route of colonisation of substrata by hydropsychid larvae (commonly found in the drift) is by drifting directly onto substrata or by walking along the stream bottom. The experimental design contained four treatments: substrata open to drifters and walkers; fenced substrata open to drifters only; and two treatments open to drifters and

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Fuentes-Pérez, Juan Francisco, Francisco Javier Sanz-Ronda, and Jeffrey A. Tuhtan. "An Open Surface Drifter for River Flow Field Characterization." Sensors 22, no. 24 (2022): 9918. http://dx.doi.org/10.3390/s22249918.

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The continuous observation of flows is required to assess a river’s ecological status, to allocate irrigation withdrawals, to provide sustainable hydropower production and to plan actions as well as develop adaptive management plans. Drifters have the potential of facilitating the monitoring and modeling of river behavior at a fraction of traditional monitoring costs. They are floating objects equipped with sensors able to passively follow the movements of water. During their travel, they collect and transmit information about their movement and their surrounding environment. In this paper, we

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Leppäranta, Matti, Zhang Zhanhai, Jari Haapala, and Tapani Stipa. "Sea-ice kinematics measured with GPS drifters." Annals of Glaciology 33 (2001): 151–56. http://dx.doi.org/10.3189/172756401781818789.

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AbstractA sea-ice dynamics experiment was performed in the Baltic Sea in March 1997. A new type of drifter was constructed based on the global positioning system and mobile-phone data transmission. The drifters worked well and the accuracy was reasonable (std dev. 40 m). Five drifters were used to map ice kinematics in a 20 km size array in the coastal drift-ice zone. The study included periods of onshore motion with ridge formation, and alongshore motion with narrow shear lines. The motion of ice largely occurred in short pulses between which the field stood nearly still. The level of ice spe

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Poulain, Pierre-Marie, and Riccardo Gerin. "Assessment of the Water-Following Capabilities of CODE Drifters Based on Direct Relative Flow Measurements." Journal of Atmospheric and Oceanic Technology 36, no. 4 (2019): 621–33. http://dx.doi.org/10.1175/jtech-d-18-0097.1.

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AbstractDirect measurements of the relative water flow near the top and bottom of Coastal Ocean Dynamics Experiment (CODE) drifters were made in the northeast Pacific Ocean and the Mediterranean Sea in wind speeds as large as 15 m s−1. These measurements confirmed that the CODE drifter is a good Lagrangian drifter with a mean downwind slip of about 0.1% of the wind speed. Substantial mean vertical shears across the drifter (top 1 m below the surface) were observed, reaching an amplitude of 12 cm s−1 and corresponding to strong stratification (due to the proximity of river runoff) and strong wi

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