English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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

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