Shot point coordinates of a parasound profile during METEOR cruise M76/3a
This study investigates the geometry and temporal variation of a prominent gas bubble stream from a seafloor pockmark in the Lower Congo Basin. We present results of a 3D gridding approach of singlebeam echosounder water column data (Parasound 18 kHz) that increases the lateral resolution and improv...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.893340 2024-09-09T19:10:32+00:00 Shot point coordinates of a parasound profile during METEOR cruise M76/3a Wenau, Stefan Spieß, Volkhard Keil, Hanno Fei, Tai MEDIAN LATITUDE: -6.696117 * MEDIAN LONGITUDE: 10.350736 * SOUTH-BOUND LATITUDE: -6.746640 * WEST-BOUND LONGITUDE: 10.292440 * NORTH-BOUND LATITUDE: -6.661820 * EAST-BOUND LONGITUDE: 10.411340 * DATE/TIME START: 2008-06-07T00:00:00 * DATE/TIME END: 2008-07-13T00:00:00 2018 text/tab-separated-values, 56612 data points https://doi.pangaea.de/10.1594/PANGAEA.893340 https://doi.org/10.1594/PANGAEA.893340 en eng PANGAEA Wenau, Stefan: Documentation of a gas bubble stream in the Lower Congo Basin (zipped pdf-files, 99.4 MB). https://store.pangaea.de/Publications/Wenau-etal_2018/Documentation_Wenau-etal_2018.zip https://doi.pangaea.de/10.1594/PANGAEA.893340 https://doi.org/10.1594/PANGAEA.893340 CC-BY-NC-ND-3.0: Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Wenau, Stefan; Spieß, Volkhard; Keil, Hanno; Fei, Tai (2018): Localization and characterization of a gas bubble stream at a Congo deep water seep site using a 3D gridding approach on single-beam echosounder data. Marine and Petroleum Geology, 97, 612-623, https://doi.org/10.1016/j.marpetgeo.2018.07.016 Center for Marine Environmental Sciences Congo Canyon CT LATITUDE LONGITUDE M76/3a M76/3a-track MARUM Meteor (1986) Number Underway cruise track measurements UTM Easting Universal Transverse Mercator UTM Northing UTM Zone dataset 2018 ftpangaea https://doi.org/10.1594/PANGAEA.89334010.1016/j.marpetgeo.2018.07.016 2024-07-24T02:31:34Z This study investigates the geometry and temporal variation of a prominent gas bubble stream from a seafloor pockmark in the Lower Congo Basin. We present results of a 3D gridding approach of singlebeam echosounder water column data (Parasound 18 kHz) that increases the lateral resolution and improves the localization of anomalies beyond the inherent depth-dependent footprint size of the sonar system. This allows a detailed reconstruction of gas bubble trajectories through the water column, revealing a stable gas bubble stream for the deepest 1000 m. The bubbles are shifted laterally by ∼200 m in the transition zone between North Atlantic Deep Water and Antarctic Intermediate Water with a reconstructed current velocity of ∼4 cm/s. The direction of lateral shift varies throughout the ∼15 h survey possibly because of internal waves and small-scale eddies at the water mass boundary. Furthermore, a stacking of SBES water column data acquired during sampling stations showed a periodic variation in seepage intensity with periods of 6 and 8 min, which are likely related to temporally modulated gas supply to the sea floor. Singlebeam echosounder are commonly limited by their small coverage of the survey area during individual passes and their footprint size in detailed imaging of individual seep sites, especially in the deep sea. The presented gridding method for singlebeam echosounder data may facilitate the use of such data in deep water gas bubble stream identification and localization. Dataset Antarc* Antarctic North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic ENVELOPE(10.292440,10.411340,-6.661820,-6.746640) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences Congo Canyon CT LATITUDE LONGITUDE M76/3a M76/3a-track MARUM Meteor (1986) Number Underway cruise track measurements UTM Easting Universal Transverse Mercator UTM Northing UTM Zone |
spellingShingle |
Center for Marine Environmental Sciences Congo Canyon CT LATITUDE LONGITUDE M76/3a M76/3a-track MARUM Meteor (1986) Number Underway cruise track measurements UTM Easting Universal Transverse Mercator UTM Northing UTM Zone Wenau, Stefan Spieß, Volkhard Keil, Hanno Fei, Tai Shot point coordinates of a parasound profile during METEOR cruise M76/3a |
topic_facet |
Center for Marine Environmental Sciences Congo Canyon CT LATITUDE LONGITUDE M76/3a M76/3a-track MARUM Meteor (1986) Number Underway cruise track measurements UTM Easting Universal Transverse Mercator UTM Northing UTM Zone |
description |
This study investigates the geometry and temporal variation of a prominent gas bubble stream from a seafloor pockmark in the Lower Congo Basin. We present results of a 3D gridding approach of singlebeam echosounder water column data (Parasound 18 kHz) that increases the lateral resolution and improves the localization of anomalies beyond the inherent depth-dependent footprint size of the sonar system. This allows a detailed reconstruction of gas bubble trajectories through the water column, revealing a stable gas bubble stream for the deepest 1000 m. The bubbles are shifted laterally by ∼200 m in the transition zone between North Atlantic Deep Water and Antarctic Intermediate Water with a reconstructed current velocity of ∼4 cm/s. The direction of lateral shift varies throughout the ∼15 h survey possibly because of internal waves and small-scale eddies at the water mass boundary. Furthermore, a stacking of SBES water column data acquired during sampling stations showed a periodic variation in seepage intensity with periods of 6 and 8 min, which are likely related to temporally modulated gas supply to the sea floor. Singlebeam echosounder are commonly limited by their small coverage of the survey area during individual passes and their footprint size in detailed imaging of individual seep sites, especially in the deep sea. The presented gridding method for singlebeam echosounder data may facilitate the use of such data in deep water gas bubble stream identification and localization. |
format |
Dataset |
author |
Wenau, Stefan Spieß, Volkhard Keil, Hanno Fei, Tai |
author_facet |
Wenau, Stefan Spieß, Volkhard Keil, Hanno Fei, Tai |
author_sort |
Wenau, Stefan |
title |
Shot point coordinates of a parasound profile during METEOR cruise M76/3a |
title_short |
Shot point coordinates of a parasound profile during METEOR cruise M76/3a |
title_full |
Shot point coordinates of a parasound profile during METEOR cruise M76/3a |
title_fullStr |
Shot point coordinates of a parasound profile during METEOR cruise M76/3a |
title_full_unstemmed |
Shot point coordinates of a parasound profile during METEOR cruise M76/3a |
title_sort |
shot point coordinates of a parasound profile during meteor cruise m76/3a |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.893340 https://doi.org/10.1594/PANGAEA.893340 |
op_coverage |
MEDIAN LATITUDE: -6.696117 * MEDIAN LONGITUDE: 10.350736 * SOUTH-BOUND LATITUDE: -6.746640 * WEST-BOUND LONGITUDE: 10.292440 * NORTH-BOUND LATITUDE: -6.661820 * EAST-BOUND LONGITUDE: 10.411340 * DATE/TIME START: 2008-06-07T00:00:00 * DATE/TIME END: 2008-07-13T00:00:00 |
long_lat |
ENVELOPE(10.292440,10.411340,-6.661820,-6.746640) |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Wenau, Stefan; Spieß, Volkhard; Keil, Hanno; Fei, Tai (2018): Localization and characterization of a gas bubble stream at a Congo deep water seep site using a 3D gridding approach on single-beam echosounder data. Marine and Petroleum Geology, 97, 612-623, https://doi.org/10.1016/j.marpetgeo.2018.07.016 |
op_relation |
Wenau, Stefan: Documentation of a gas bubble stream in the Lower Congo Basin (zipped pdf-files, 99.4 MB). https://store.pangaea.de/Publications/Wenau-etal_2018/Documentation_Wenau-etal_2018.zip https://doi.pangaea.de/10.1594/PANGAEA.893340 https://doi.org/10.1594/PANGAEA.893340 |
op_rights |
CC-BY-NC-ND-3.0: Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.89334010.1016/j.marpetgeo.2018.07.016 |
_version_ |
1809825889972649984 |