Skip to main content
U.S. flag

An official website of the United States government

Microbial Nitrogen Transformations in the Oxygen Minimum Zone off Peru, 1985-02-01 to 1985-03-05 (NCEI Accession 9200026)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: May 29, 2026 at 10:37 PM | Dataset Last Updated: February 15, 2023 at 12:00 AM
NITROP - 85 was the major field of experiment of an N.S.F. funded program entitled "Microbial Nitrogen Transformations in the Oxygen Minimum Zone off Peru". This project focused on obtaining a better understanding of the microbially mediated changes in nitrogen pathways and the controls on these pathways in and at the boundaries of the oxygen deficient water masses (O2 < 0.05 ml/l) found off Peru. The somewhat "random walk" nature of our cruise track and the existence of multi-cast stations reflects this emphasis. Considerable effort was expended on finding the right conditions to test various aspects of our hypotheses, and once a favorable site was located, many casts were necessary to obtain the large volume samples needed for some of our experiments. Since particle maxima appear to be well correlated with the nitrite maxima that are imbedded in the core of the oxygen deficient water masses, we also determined optical characteristics of the water at our sampling sites. Primary productivity and chlorophyll observations were also made during NITROP - 85.

Resources

9 resources available

Find Related Datasets

Search by Tags

Click any tag below to search for similar datasets

9200026 AIR TEMPERATURE AIR TEMPERATURE - DRY BULB AIR TEMPERATURE - WET BULB AMMONIA (NH3) BAROMETRIC PRESSURE CARBON - TOTAL ORGANIC CHLOROPHYLL A

Complete Metadata
@type dcat:Dataset
accessLevel non-public
contactPoint 
{
  "fn": "NOAA National Centers for Environmental Information",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:ncei.info@noaa.gov"
}
describedByType application/octet-steam
description NITROP - 85 was the major field of experiment of an N.S.F. funded program entitled "Microbial Nitrogen Transformations in the Oxygen Minimum Zone off Peru". This project focused on obtaining a better understanding of the microbially mediated changes in nitrogen pathways and the controls on these pathways in and at the boundaries of the oxygen deficient water masses (O2 < 0.05 ml/l) found off Peru. The somewhat "random walk" nature of our cruise track and the existence of multi-cast stations reflects this emphasis. Considerable effort was expended on finding the right conditions to test various aspects of our hypotheses, and once a favorable site was located, many casts were necessary to obtain the large volume samples needed for some of our experiments. Since particle maxima appear to be well correlated with the nitrite maxima that are imbedded in the core of the oxygen deficient water masses, we also determined optical characteristics of the water at our sampling sites. Primary productivity and chlorophyll observations were also made during NITROP - 85.
distribution 
[
  {
    "@type": "dcat:Distribution",
    "title": "NCEI Dataset Landing Page",
    "accessURL": "https://www.ncei.noaa.gov/archive/accession/9200026",
    "mediaType": "text/html",
    "description": "Navigate directly to the URL for a descriptive web page with download links.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Descriptive Information",
    "accessURL": "https://www.ncei.noaa.gov/archive/accession/oas/9200026",
    "mediaType": "text/html",
    "description": "Navigate directly to the URL for a descriptive web page with download links.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "HTTPS",
    "accessURL": "https://www.ncei.noaa.gov/archive/accession/download/9200026",
    "mediaType": "text/html",
    "description": "Navigate directly to the URL for data access and direct download.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "FTP",
    "accessURL": "ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0001/9200026/",
    "mediaType": "text/html",
    "description": "These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Current measurements from moorings off Northern California, September 1984 - July 1985",
    "accessURL": "https://ir.library.oregonstate.edu/concern/defaults/79407z72h?locale=en",
    "mediaType": "text/html",
    "description": "Technical Report",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "NITROP-85 data report R/V Wecoma cruise, Feb 1-Mar 5, 1985",
    "accessURL": "https://discover.library.noaa.gov/permalink/01NOAA_INST/1qbesct/alma991000377069707381",
    "mediaType": "text/html",
    "description": "NOAA Central Library: ca. 350 leaves; ill.; 28 cm",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "GCMD Keyword Forum Page",
    "accessURL": "https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords",
    "mediaType": "text/html",
    "description": "Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "NCEI Contact Information",
    "accessURL": "https://www.ncei.noaa.gov/contact",
    "mediaType": "text/html",
    "description": "Information for contacts at NCEI.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "NOAA Library website",
    "accessURL": "https://library.noaa.gov/",
    "mediaType": "text/html",
    "description": "Institution web page",
    "describedByType": "application/octet-stream"
  }
]
identifier https://data.noaa.gov/waf/NOAA/NESDIS/ncei/accessions/iso/xml/9200026.xml
issued 1992-01-01T00:00:00.000+00:00
keyword 
[
  "9200026",
  "AIR TEMPERATURE",
  "AIR TEMPERATURE - DRY BULB",
  "AIR TEMPERATURE - WET BULB",
  "AMMONIA (NH3)",
  "BAROMETRIC PRESSURE",
  "CARBON - TOTAL ORGANIC",
  "CHLOROPHYLL A",
  "cloud amount/frequency",
  "cloud type",
  "CONDUCTIVITY",
  "DEPTH - OBSERVATION",
  "DISSOLVED ORGANIC CARBON",
  "DISSOLVED OXYGEN",
  "DYNAMIC DEPTH ANOMALY",
  "HYDROCARBONS - TOTAL RESOLVED",
  "HYDROSTATIC PRESSURE",
  "NITRATE",
  "NITRITE",
  "OXYGEN",
  "pH",
  "PHAEOPIGMENTS",
  "phosphate",
  "POLYCHLORINATED BIPHENYLS",
  "SALINITY",
  "SEA STATE",
  "Secchi depth",
  "SIGMA-T",
  "silicate",
  "SOLAR RADIATION - ATMOSPHERIC",
  "SOUND VELOCITY",
  "suspended solids",
  "TIDE HEIGHT",
  "TIDE STAGE",
  "total alkalinity",
  "TOTAL CARBON",
  "TOTAL PHOSPHORUS",
  "turbidity",
  "WATER COLOR",
  "WATER DENSITY",
  "water depth",
  "WATER TEMPERATURE",
  "WAVE HEIGHT",
  "WAVE PERIOD",
  "WEATHER",
  "WIND DIRECTION",
  "WIND FORCE",
  "WIND SPEED",
  "ZOOPLANKTON BIOMASS",
  "bottle",
  "CTD",
  "meteorological sensor",
  "Secchi disk",
  "physical",
  "profile",
  "R/V WECOMA",
  "Duke University",
  "Harvard University",
  "Monterey Bay Aquarium Research Institute",
  "Oregon State University, College of Earth, Ocean, and Atmospheric Sciences",
  "Scripps Institution of Oceanography",
  "University of Copenhagen",
  "Bigelow Laboratory for Ocean Sciences",
  "Southeast Pacific Ocean (limit-140 W)",
  "oceanography",
  "BIGELOW > Bigelow Laboratory of Ocean Sciences",
  "DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce",
  "MBARI > Monterey Bay Aquarium Research Institute",
  "OR-STATE/CEOAS > College of Earth, Ocean, and Atmospheric Sciences, Oregon State University",
  "EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE",
  "EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION > INCOMING SOLAR RADIATION",
  "EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE",
  "EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE > AIR TEMPERATURE",
  "EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND DIRECTION",
  "EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND SPEED",
  "EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY",
  "EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD TYPES",
  "EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON",
  "EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH",
  "EARTH SCIENCE > OCEANS > OCEAN ACOUSTICS > ACOUSTIC VELOCITY",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > HYDROCARBONS",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC CARBON",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SUSPENDED SOLIDS",
  "EARTH SCIENCE > OCEANS > OCEAN OPTICS > OCEAN COLOR",
  "EARTH SCIENCE > OCEANS > OCEAN OPTICS > SECCHI DEPTH",
  "EARTH SCIENCE > OCEANS > OCEAN OPTICS > TURBIDITY",
  "EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE",
  "EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE",
  "EARTH SCIENCE > OCEANS > OCEAN WAVES > SEA STATE",
  "EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE HEIGHT",
  "EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE PERIOD",
  "EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY",
  "EARTH SCIENCE > OCEANS > SALINITY/DENSITY > DENSITY",
  "EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY",
  "EARTH SCIENCE > OCEANS > TIDES",
  "EARTH SCIENCE > OCEANS > TIDES > TIDAL HEIGHT",
  "CTD > Conductivity, Temperature, Depth",
  "SECCHI DISKS > SECCHI DISKS",
  "WECOMA (call sign: WSD7079, ICES code: 32WC, 1976-)",
  "OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN"
]
landingPage https://www.ncei.noaa.gov/contact
language 
[]
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2023-02-15T00:00:00.000+00:00
publisher 
{
  "name": "NOAA National Centers for Environmental Information",
  "@type": "org:Organization"
}
references 
[
  "https://ir.library.oregonstate.edu/concern/defaults/79407z72h?locale=en",
  "https://discover.library.noaa.gov/permalink/01NOAA_INST/1qbesct/alma991000377069707381"
]
rights otherRestrictions
spatial -81.4,-16.4,-81.6,5.0
temporal 1985-02-04T00:00:00+00:00/1985-03-03T00:00:00+00:00
title Microbial Nitrogen Transformations in the Oxygen Minimum Zone off Peru, 1985-02-01 to 1985-03-05 (NCEI Accession 9200026)

data.gov

An official website of the GSA's Technology Transformation Services

Looking for U.S. government information and services?
Visit USA.gov