Cristin-resultat-ID: 1493401
Sist endret: 13. september 2017, 15:02
Resultat
Faglig foredrag
2017

Echosounder observations from an unmanned surface vessel in the Arctic

Bidragsytere:
  • Asuka Yamakawa
  • Jenny Ullgren og
  • Rune Øyerhamn

Presentasjon

Navn på arrangementet: Underwater Acoustics Conference & Exhibitions
Sted: Skiathos
Dato fra: 4. september 2017
Dato til: 8. september 2017

Arrangør:

Arrangørnavn: Professor John. S. Papadakis, F.O.R.T.H., Greece

Om resultatet

Faglig foredrag
Publiseringsår: 2017

Beskrivelse Beskrivelse

Tittel

Echosounder observations from an unmanned surface vessel in the Arctic

Sammendrag

The Arctic marine ecosystem is sensitive to human-induced changes, such as acidification caused by CO2 emissions; it is also a challenging environment to observe. In summer 2016 we used small autonomous sailing platforms, SailBuoys, to collect data at high spatial and temporal resolution in order to improve our knowledge of physical and chemical processes in the region near the ice edge, and their effects on biological production. Two SailBuoys were deployed in the Fram Strait for three weeks in June–July 2016. One of the SailBuoys was equipped with a 200 kHz echo sounder (Simrad EK15), and the other with a sensor suite designed to measure ocean acidification. The main purpose of the acoustic measurements was to give an estimate of biological activity. Echo-sounder data were recorded every 30 minutes for a duration of 15 minutes. To preserve battery power, the echo sounder was not always in operation. For the biological analysis we use 79 records collected during 5 days. Echograms were produced using data only from the upper 100 m. Since echo-sounder data were collected from a single platform with a single frequency and no ground truth data, the interpretation of the echograms is limited. However, we have developed an automatic algorithm to compute object features such as position, area, and length from the cleaned images. The data from the SailBuoys are compared with other in situ data from the 2016 research cruise (XBT and CTD profiles) as well as with satellite remote sensing data e.g. chlorophyll, wind speed, and the distance to the nearest ice edge.

Bidragsytere

Asuka Yamakawa

  • Tilknyttet:
    Forfatter
    ved Nansen Senter for Miljø og Fjernmåling

Jenny Ullgren

  • Tilknyttet:
    Forfatter
    ved Geofysisk institutt ved Universitetet i Bergen

Rune Øyerhamn

  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk og teknologi ved Universitetet i Bergen
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