PANGAEA - Data publisher for Earth & environmental sciences

Abstract

; She, Mengkun; Greinert, Jens (2022): Optical and hydroacoustical measurements of bubble-�ow seepage o�shore Oregon (~46° N) during RV FALKOR cruise FK190612. PANGAEA, https://doi.org/10.1594/PANGAEA.947592 Always quote citation above when using data! You can download the citation in several formats below. RIS Citation B��T�X Citation Copy Citation Facebook Twitter Show Map Google Earth 8 3       Abstract: Two lander-based devices, the Bubble-Box and GasQuant-II, were used to investigate the spatial and temporal variability and total gas �ow rates of a seep area o�shore Oregon, United States. The Bubble-Box is a stereo camera-equipped lander that records bubbles inside a rising corridor with 80 Hz, allowing for automated image analyses of bubble size distributions and rising speeds. GasQuant is a hydroacoustic lander using a horizontally oriented multibeam swath (Imagenex DeltaT) to record the backscatter intensity of bubble streams passing the swath plain. The experimental set up at the Astoria Canyon site at a water depth of about 500m aimed at calibrating the hydroacoustic GasQuant data with the visual Bubble-Box data for a spatial and temporal �ow rate quanti�cation of the site. For about 90h in total, both systems were deployed simultaneously and pressure and temperature data were recorded using a CTD as well. The data presented here contain post-processed information collected with the two lander-based devices during the cruise FK190612 on board RV FALKOR from the Schmidt-Ocean Institute in June 2019 (https://schmidtocean.org/cruise/methane-seeps-at-edge-of-hydrate-stability/). The �rst dataset contains post-processed ASCII information of the optic data recorded with the Bubble-Box system during two deployments (BBM-11 and BBM-17) and includes overall results of bubble sizes, volumes, rising speeds and �ow rates of the observed bubble streams. A second dataset contains the acoustic backscatter of a seep site collected with the GasQuant II system during two deployments (GQM-3 and GQM-4). Each �le contains the uncalibrated backscatter averaged in time (1 minute average) of the original dataset recorded with the GasQuant II. Files are provided in the Imagenex DeltaT data output format (*.83b) and can be easily visualized and inspected using FMMidwater (QPS) .