Passive surface drifter data in the bay of Sept-Îles in 2017-2018


Lagrangian drift data were gathered in the Bay of Sept-Îles during the Spring and Summer in 2017 and 2018, as part of the Canadian Healthy Oceans Network (CHONe II) program. The drifters were deployed from shore and from two local fishing vessels: the Monica and Yvan-Raymond. The drifters consisted of a Spot Trace GPS emitter fixed on a wooden circular base 30 cm in diameter with a 0.9 kg weight attached to the opposite side to ensure that the emitter stays above water. Positions were recorded every 10 minutes. Data remaining persistently at low depth (<2 m) and low speed (<5 cm s-1) were considered shoaled and removed. A purpose-built graphical user interface program was used to remove GPS points on land or on the boat, and separate the GPS traces of each device into continuous movements (uninterrupted by shoaling). Positions were linearly interpolated to a 10 minute grid after quality control.

Description-----------These drifts were gathered by Jean-Luc Shaw in 2017-18, as part of work for a masters degree in oceanography an Institut des sciences de la mer de Rimouski (ISMER), and as part of the Canadia Healthy Oceans Network (CHONeII) parternship. The drifters were a wooden base about 30 cm in diameter with a Spot GPS beacon attached to one side and a 5 pound weight attached to the other side, such as to maintain the beacon out of the water. The longitude, latitudes and time were automatically recorded and were processed to obtain the following parameters: * longitude (degrees east) * latitude (degrees north) * datenum UTC (days since January 0, 0000) * velocity east (meters / second) * velocity north (meters / second) * velocity magnitude (meters / second) * velocity direction (compass degrees) * time after high tide (hours) * water depth (meters) * time UTCSee the referred publication for information on data sets used to obtain these values.Processing----------Data quality was cheked using a custom-made graphical user interface software. This software allowed removal positions on land as well as compensation for bad pings and missing pings. The data identified as good were interpolated to a regular time grid, and the velocity information was then calculated. All observations in this data set should be viewed as quality controlled. Flags indicate the start of the drift (DPL), the movement data (OCN), and the end of the drift (END).

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Metadata Access
Creator Shaw, Jean-Luc ORCID logo; Bourgault, Daniel; Dumont, Dany ORCID logo; Lefaivre, Denis
Publisher PANGAEA
Publication Year 2022
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 42564 data points
Discipline Earth System Research
Spatial Coverage (-66.991W, 48.395S, -63.736E, 50.266N); South Atlantic Ocean
Temporal Coverage Begin 2017-05-05T16:07:37Z
Temporal Coverage End 2018-06-25T18:47:32Z