PANGAEA_975782 Acoustic data from IESSNS north, northeast, south and west of Iceland in July 2021 Ólafsdóttir, Anna H; Pampoulie, Christophe Acoustic data from IESSNS north, northeast, south and west of Iceland in July 2021 2025-09-01 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.975782 Investigator Anna H Ólafsdóttir anna.olafsdottir@hafogvatn.is Earth Science Event label DATE/TIME Date/time end LATITUDE Latitude 2 LONGITUDE Longitude 2 Depth, water, top/minimum Depth, water, bottom/maximum DEPTH, water Identification Data acquisition software (recording raw data) Frequency Number of pings Beamwidth, alongship Beamwidth, athwartship Gain, transducer Simrad correction factor Ping interval Pulse duration, transmitted Power, transmitted Sound velocity in water Sound absorption Calibration Echogram, raw format Echogram, raw format (File Size) Echogram, raw format (MD5 Hash) Echosounder index file Echosounder index file (File Size) Echosounder index file (MD5 Hash) Calibration file, xml format Calibration file, xml format (File Size) Calibration file, xml format (MD5 Hash) geoscientificInformation A12-2021_Underway-1 acoustic data Echosounder, Simrad EK80 (Kongsberg Maritime AS) IESSNS IESSNS_2021 July 2021 Northeast Atlantic Echosounder, Simrad EK80 (Kongsberg Maritime AS) Calculated average/mean values Arni Fridriksson 2021-07-05 2021-07-26 Complete 62.69677 69.29894 -31.003440000000012 -6.53991000000002 246.475735 m (DEPTH, water) 251.500995 m (DEPTH, water) SUMMER Sustainable Management of Mesopelagic Resources unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 232342 data points text/tab-separated-values Ólafsdóttir, Anna H; Finnbogadóttir, Gudrún; Kennedy, James; Sigurgeirsdóttir, Sólrún; Aradóttir, Svandís Eva (2022): Results of the Icelandic part of the International Ecosystem Summer Survey in Nordic Seas (IESSNS) in July 2021 on R/V Árni Friðriksson. Marine and Freshwater Research Institute, Iceland, 40 pp., https://download.pangaea.de/reference/112493/attachments/IESSNS_IS_2021.pdf Ólafsdóttir, Anna H; Pampoulie, Christophe (2022): Fish and invertebrate trawl sampling south and west of Iceland in July 2021 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.942987 Proud, Roland; Cuparanalytics (2024): rolandproud/echoutilities: Initial release [software]. Zenodo, https://doi.org/10.5281/ZENODO.13377783

This data set has acoustic data during the Icelandic part of the International Ecosystem Summer Survey in Nordic Seas (IESSNS) July 5-26, 2021. The survey area was the shelf, shelf edge and deeper waters north, northeast, south and west of Iceland. The acoustic data was collected using a Simrad EK80 scientific echo sounder transducer with five transceiver units operating at different frequencies which are 18 kHz, 38 kHz, 70, kHz, 120 kHz and 200 kHz. Sampling depth is measured from transceiver surface which is located at 9 m depth in the water column. Maximum sampling depth was 500 m. The echo sounder was calibrated prior to survey as per manufacturer's instructions and a calibration file is included with submission, called calibration_2021.xml. Raw power (W), number of transducer segments and transceiver impedance (Ohm) were recorded. Information about the trawl catches and biological measurement of catch collected during the survey is in data set Ólafsdóttir and Pampoulie (2022, doi:10.1594/PANGAEA.942987). For detailed information about the survey see the survey report (Ólafsdóttir et al., 2022). ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.975782"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/ISO_8601 DATE/TIME http://en.wikipedia.org/wiki/ISO_8601 Date/time end https://doi.org/10.5281/ZENODO.13377783 rolandproud/echoutilities: Initial release https://doi.pangaea.de/10.1594/PANGAEA.942987 Fish and invertebrate trawl sampling south and west of Iceland in July 2021 https://en.wikipedia.org/wiki/Speed_of_sound Sound velocity in water DIF 9.4 2025-09-01 2026-06-01