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High-Resolution Topography-Following Chemical Mapping of Ocean Hypoxia by Use of an Autonomous Underwater Vehicle: The Santa Monica Basin Example

Hofmann, Andreas F. and Walz, Peter M. and Thomas, Hans and Peltzer, Edward T. and Brewer, Peter G. (2013) High-Resolution Topography-Following Chemical Mapping of Ocean Hypoxia by Use of an Autonomous Underwater Vehicle: The Santa Monica Basin Example. Journal of Atmospheric and Oceanic Technology, 30 (11), pp. 2630-2646. American Meteorological Society. DOI: [10.1175/JTECH-D-12-00249.1] ISSN 0739-0572

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Official URL: http://journals.ametsoc.org/doi/abs/10.1175/JTECH-D-12-00249.1

Abstract

This paper reports on the execution of a combined chemical sensing/high-resolution terrain-following autonomous underwater vehicle (AUV) survey to explore the fine structure and functional boundaries of the Santa Monica Basin suboxic zone and its relationship to topography. An AUV mapping vehicle is used in a novel configuration—combining the mapping vehicle tail section, with precision inertial navigation and acoustic communications systems, with CTD/O2, NO3 sensing, and Gulper water sampling systems. The challenge was to perform a long-distance near-bottom physical/chemical survey in deep water without any intermediate surfacing to disrupt the survey or require the vehicle to surface in areas of heavy ship traffic. Some 210km of AUV cruise track at ’10m above bottom were accomplished during a 3-day survey. The dissolved oxygen concentration [O2] data are combined with temperature T, salinity S, and hydrostatic pressure P to produce maps of oxygen partial pressure pO2 that help define the limits at which the oceanic supply of O2 can match the O2 demands required to sustain various forms of marine life. The chemical NO3 sensing was included to define the critical pO2 boundary at which NO3 reduction occurs. The combination of a high-resolution terrain-following AUV with chemical sensors is important for a diverse array of investigations, including the study of vent sites, and for locating the source of chemical signals originating from the seafloor. The hypoxic basin example here permits better discrimination between general climate/ circulation controls on hypoxia and more specific point-source-driven processes.

Item URL in elib:https://elib.dlr.de/85564/
Document Type:Article
Title:High-Resolution Topography-Following Chemical Mapping of Ocean Hypoxia by Use of an Autonomous Underwater Vehicle: The Santa Monica Basin Example
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hofmann, Andreas F.DLR & MBARIUNSPECIFIED
Walz, Peter M.MBARI (Monterey Bay Aquarium Research Institute)UNSPECIFIED
Thomas, HansMBARI (Monterey Bay Aquarium Research Institute)UNSPECIFIED
Peltzer, Edward T.MBARI (Monterey Bay Aquarium Research Institute)UNSPECIFIED
Brewer, Peter G.MBARI (Monterey Bay Aquarium Research Institute)UNSPECIFIED
Date:November 2013
Journal or Publication Title:Journal of Atmospheric and Oceanic Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:30
DOI :[10.1175/JTECH-D-12-00249.1]
Page Range:pp. 2630-2646
Publisher:American Meteorological Society
ISSN:0739-0572
Status:Published
Keywords:In situ oceanic observations, Oceanic variability
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: other
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Hofmann, Andreas Felix
Deposited On:28 Nov 2013 13:24
Last Modified:31 Jul 2019 19:43

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