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Submarine groundwater discharge at Kahana Bay, Oahu, 1997-2001: in situ CTD and water chemistry tracer data (NCEI Accession 0011399)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: August 03, 2026 at 01:35 AM | Dataset Last Updated: December 13, 2006 at 12:00 AM
Submarine groundwater discharge (SGD) is neither well understood nor commonly investigated in Hawaii, but it is recognized as a potential pollution source to coastal environments. Between 1997 and 2001, this study located and quantified both total SGD and the terrestrial SGD fraction in Kahana Bay, Oahu. CTD casts were used to profile the water structure and identify potential areas of SGD impact in the bay. Lee-type seepage meters were used to measure SGD rates and collect samples of SGD directly. Radon-222, Si, Cl., and total alkalinity (Ta) were used as natural tracers to measure the terrestrial groundwater fraction within SGD. Nutrient concentrations were also measured to calculate total nutrient fluxes into the bay via SGD.

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0011399 AMMONIUM (NH4) CHLORINITY Methane (CH4) NITRATE NITROGEN NITROGEN - ORGANIC phosphate

Complete Metadata
@type dcat:Dataset
accessLevel non-public
contactPoint 
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describedByType application/octet-steam
description Submarine groundwater discharge (SGD) is neither well understood nor commonly investigated in Hawaii, but it is recognized as a potential pollution source to coastal environments. Between 1997 and 2001, this study located and quantified both total SGD and the terrestrial SGD fraction in Kahana Bay, Oahu. CTD casts were used to profile the water structure and identify potential areas of SGD impact in the bay. Lee-type seepage meters were used to measure SGD rates and collect samples of SGD directly. Radon-222, Si, Cl., and total alkalinity (Ta) were used as natural tracers to measure the terrestrial groundwater fraction within SGD. Nutrient concentrations were also measured to calculate total nutrient fluxes into the bay via SGD.
distribution 
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identifier https://data.noaa.gov/waf/NOAA/NESDIS/ncei/accessions/iso/xml/0011399.xml
issued 2006-12-13T00:00:00.000+00:00
keyword 
[
  "0011399",
  "AMMONIUM (NH4)",
  "CHLORINITY",
  "Methane (CH4)",
  "NITRATE",
  "NITROGEN",
  "NITROGEN - ORGANIC",
  "phosphate",
  "PHOSPHATE - TOTAL",
  "PHOSPHORUS - ORGANIC",
  "SALINITY",
  "Silicon",
  "total alkalinity",
  "WATER TEMPERATURE",
  "CTD",
  "chemical",
  "physical",
  "University of Hawaiʻi at Mānoa",
  "URS Corporation",
  "URS Corporation",
  "Coastal Waters of Hawaii",
  "Hawaiian Islands Humpback Whale National Marine Sanctuary",
  "North Pacific Ocean",
  "oceanography",
  "DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE",
  "EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE",
  "EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY",
  "CTD > Conductivity, Temperature, Depth",
  "OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > HAWAIIAN ISLANDS",
  "OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN"
]
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language 
[]
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2006-12-13T00:00:00.000+00:00
publisher 
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rights otherRestrictions
spatial -157.85,21.55416,-157.875,21.57917
temporal 1997-10-07T00:00:00+00:00/2001-03-15T00:00:00+00:00
theme 
[
  "geospatial"
]
title Submarine groundwater discharge at Kahana Bay, Oahu, 1997-2001: in situ CTD and water chemistry tracer data (NCEI Accession 0011399)

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