Monterey Bay Profiles from CTD, Nephelometer, a Transmissometer and a Structured Light Source with High Definition Video Detection were used on board the RO Ventana during September 2001 and March 2002 for Study of Methane Cycling in Mid-Water Suspended Particle Layers (NCEI Accession 0000902)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: May 06, 2026 at 12:42 AM | Dataset Last Updated: January 18, 2026 at 12:00 AM

CTD data from remotely operated vehicle working in Monterey Bay, California. The remotely operated vehicle Ventana was used to measure the vertical distribution and the optical characteristics of suspended layers of fine particles along the axis of Monterey Canyon in Monterey Bay, California. A combination of a nephelometer, a transmissometer and a structured light source with high definition video detection was used for these measurements. The particles layers ranged from broad bands extending over several hundred meters of depth to thin, concentrated layers <20 m thick. Ventana was also used to collect water samples, without the physical disruptions inherent in CTD/rosette-based sampling, within and around the particle layers. Samples were collected from depths of 400 - 1450 m and are being analyzed for methane, methane carbon stable isotopes, alkalinity, nutrients, thorium isotopes, and pH. In addition, video of the structured light transects were analyzed to determine particle size distribution and collected particles were analyzed for mineral and chemical composition. Finally, genomic characterization of the microbial communities on the collected particles will be conducted.

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accessLevel	non-public
contactPoint	{ "fn": "NOAA National Centers for Environmental Information", "@type": "vcard:Contact", "hasEmail": "mailto:ncei.info@noaa.gov" }
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description	CTD data from remotely operated vehicle working in Monterey Bay, California. The remotely operated vehicle Ventana was used to measure the vertical distribution and the optical characteristics of suspended layers of fine particles along the axis of Monterey Canyon in Monterey Bay, California. A combination of a nephelometer, a transmissometer and a structured light source with high definition video detection was used for these measurements. The particles layers ranged from broad bands extending over several hundred meters of depth to thin, concentrated layers <20 m thick. Ventana was also used to collect water samples, without the physical disruptions inherent in CTD/rosette-based sampling, within and around the particle layers. Samples were collected from depths of 400 - 1450 m and are being analyzed for methane, methane carbon stable isotopes, alkalinity, nutrients, thorium isotopes, and pH. In addition, video of the structured light transects were analyzed to determine particle size distribution and collected particles were analyzed for mineral and chemical composition. Finally, genomic characterization of the microbial communities on the collected particles will be conducted.
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identifier	https://data.noaa.gov/waf/NOAA/NESDIS/ncei/accessions/iso/xml/0000902.xml
issued	2003-01-31T00:00:00.000+00:00
keyword	[ "0000902", "CONDUCTIVITY", "DEPTH - OBSERVATION", "HYDROSTATIC PRESSURE", "NEPHELS", "OXYGEN", "SALINITY", "TRANSMISSIVITY", "WATER TEMPERATURE", "CTD", "nephelometer", "transmissometer", "optical", "physical", "profile", "University of Hawaiʻi at Mānoa", "University of Hawaiʻi at Mānoa", "North Pacific Ocean", "oceanography", "DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce", "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN", "EARTH SCIENCE > OCEANS > OCEAN OPTICS > ATTENUATION/TRANSMISSION", "EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE", "EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE", "EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY", "EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY", "CTD", "Nephlelometer", "Temperature", "conductivity", "dissolved oxygen", "profile", "remotely operated vehicle Ventana", "salininty", "transmissometer", "CTD > Conductivity, Temperature, Depth", "TRANSMISSOMETERS", "OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN", "California", "Monterey Bay", "Pacific Ocean" ]
landingPage	https://www.ncei.noaa.gov/contact
language	[]
license	https://creativecommons.org/publicdomain/zero/1.0/
modified	2026-01-18T00:00:00.000+00:00
publisher	{ "name": "NOAA National Centers for Environmental Information", "@type": "org:Organization" }
rights	otherRestrictions
spatial	-122.05,36.7,-122.12,36.77
temporal	2001-09-17T00:00:00+00:00/2002-03-22T00:00:00+00:00
title	Monterey Bay Profiles from CTD, Nephelometer, a Transmissometer and a Structured Light Source with High Definition Video Detection were used on board the RO Ventana during September 2001 and March 2002 for Study of Methane Cycling in Mid-Water Suspended Particle Layers (NCEI Accession 0000902)

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