Catalog - Data.gov

Found 173 datasets matching "nitrate isotope".

Federal
NRSA2324 Nitrate Stable Isotope Ratios
- Organization: U.S. Environmental Protection Agency
- Updated: 2025-06-02
Stable Isotope Ratios of Nitrate from the National Aquatic Resource Survey 2023 and 2024. We analyzed 163 samples with nitrate concentrations above 2 mg-N/L for oxygen and nitrogen isotopes of...
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Search relevance: 159.07 | Views last month: 0
Federal
Coupling the dual-isotope indicators of water and nitrate indicates legacy groundwater pollution
- Organization: U.S. Environmental Protection Agency
- Updated: 2020-07-22
Shallow groundwater samples were collected since 2006 for routine analysis by ODEQ from 16 domestic wells (installation dating from the 1970s) and 23 ODEQ groundwater monitoring wells...
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Search relevance: 123.44 | Views last month: 0
Federal
Chemical and isotopic data for a study of seasonality of nitrate sources and isotopic composition in the Upper Illinois River, 2004-2008
- Organization: Department of the Interior
- Updated: 2020-08-31T00:00:00Z
This data release contains chemical and isotopic data used in an investigation of nitrate sources and transport in the Upper Illinois River basin. Samples (total = 445) include river water from...
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Search relevance: 106.19 | Views last month: 0
Federal
Stable Isotope data for Vadose Zone Leaching Study, Corvallis Oregon
- Organization: U.S. Environmental Protection Agency
- Updated: 2023-08-01
Nitrate concentration and stable isotope data from lysimeters in a vadose zone leaching study. Lysimeters were installed at 0.8, 1.5 and 3 m depth within the soil. In addition, stable water...
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Search relevance: 98.08 | Views last month: 0
Federal
An integrated approach to coupled nutrient and microbial source tracking in an agricultural watershed
- Organization: U.S. Environmental Protection Agency
- Updated: 2025-08-01
metadata entry for publication. Portions of this dataset are inaccessible because: data uploaded in ScienceHub. They can be accessed through the following means: contact first author on the paper....
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Search relevance: 83.33 | Views last month: 1
Federal
Temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from THOMAS WASHINGTON in the Gulf of Alaska and North Pacific Ocean from 1984-05-04 to 1984-06-04 (NCEI Accession 0143390)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2016-02-19T00:00:00.000+00:00
This dataset includes discrete sample and profile data collected from THOMAS WASHINGTON in the Gulf of Alaska and North Pacific Ocean from 1984-05-04 to 1984-06-04 and retrieved during cruise...
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Search relevance: 60.69 | Views last month: 0
Federal
Nutrients, transient tracers, and other variables collected from profile and discrete sampling observations using Niskin bottle, CTD and other instruments in the Arctic Ocean from 2005-05-02 to 2009-05-18 (NCEI Accession 0117695)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2014-04-22T00:00:00.000+00:00
This dataset includes discrete CTD profile data collected from aircraft lending expeditions in the Arctic Ocean from 2005-05-02 to 2009-05-18. All expeditions are combined with EXPOCODE...
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Search relevance: 59.09 | Views last month: 0
Federal
Nitrate reduction rates and soil/ water chemistry from roadside ditches in the Mobile Bay (AL, USA) region (2018-05-23 to 2018-06-08) (NCEI Accession 0211099)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2020-07-15T00:00:00.000+00:00
Ninety-six roadside ditches spanning three landuse types in the Mobile Bay (Alabama, USA) region were sampled in May-June of 2018. Isotope pairing was used to measure nitrate reduction rates...
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Search relevance: 58.67 | Views last month: 0
Federal
Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from the KNORR in the Caribbean Sea, North Atlantic Ocean and South Atlantic Ocean from 1982-12-01 to 1983-02-18 (NCEI Accession 0116706)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2014-02-25T00:00:00.000+00:00
This dataset includes chemical, discrete sample, physical and profile data collected from KNORR in the Caribbean Sea, North Atlantic Ocean and South Atlantic Ocean from 1982-12-01 to 1983-02-18...
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Search relevance: 56.66 | Views last month: 0
Federal
Temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from THOMAS G. THOMPSON in the East China Sea, North Pacific Ocean and Philippine Sea from 1985-05-04 to 1985-06-03 (NCEI Accession 0156918)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2016-11-08T00:00:00.000+00:00
This dataset includes chemical, discrete sample, physical and profile data collected from THOMAS G. THOMPSON in the East China Sea (Tung Hai), North Pacific Ocean and Philippine Sea from...
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Search relevance: 56.56 | Views last month: 0
Federal
Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from the KNORR in the Caribbean Sea, North Atlantic Ocean and South Atlantic Ocean from 1982-12-01 to 1983-02-18 (NCEI Accession 0116706)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2014-02-25T00:00:00.000+00:00
This dataset includes chemical, discrete sample, physical and profile data collected from KNORR in the Caribbean Sea, North Atlantic Ocean and South Atlantic Ocean from 1982-12-01 to 1983-02-18...
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Search relevance: 56.44 | Views last month: 0
Federal
Chemical and isotopic composition of gas, water, and solids from the 2019-2020 water lake in Halema’uma’u Crater, Kīlauea Volcano, Hawaii: Sulfur and oxygen isotopes of dissolved sulfate
- Organization: Department of the Interior
- Updated: 2023-03-30T00:00:00Z
Aliquots of collected water samples were prepared for isotopic analysis at the USGS laboratories in Menlo Park, CA by precipitating dissolved sulfate as barium sulfate, using the methods of...
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Search relevance: 55.87 | Views last month: 0
Federal
Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from the MARION DUFRESNE in the Indian Ocean and Savu Sea from 1989-07-30 to 1989-09-09 (NCEI Accession 0117679)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2021-10-21T00:00:00.000+00:00
This dataset includes chemical, discrete sample, physical and profile data collected from MARION DUFRESNE in the Indian Ocean and Savu Sea from 1989-07-30 to 1989-09-09 and retrieved during cruise...
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Search relevance: 55.45 | Views last month: 0
Federal
Temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from the TYRO in the Arctic Ocean and Beaufort Sea from 1996-09-13 to 1996-10-28 (NCEI Accession 0116717)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2014-03-07T00:00:00.000+00:00
This dataset includes chemical, discrete sample, physical and profile data collected from TYRO in the Arctic Ocean and Beaufort Sea from 1996-09-13 to 1996-10-28 and retrieved during cruise...
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Search relevance: 54.95 | Views last month: 0
Federal
Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from KNORR in the North Atlantic Ocean, North Greenland Sea and others from 1972-07-18 to 1973-04-01 (NCEI Accession 0143398)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2016-02-19T00:00:00.000+00:00
This dataset includes discrete sample and profile data collected from KNORR in the North Atlantic Ocean, North Greenland Sea, Norwegian Sea, South Atlantic Ocean and Southern Oceans (> 60 degrees...
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Search relevance: 54.52 | Views last month: 0
Federal
Chemical and isotopic composition of gas, water, and solids from the 2019-2020 water lake in Halema’uma’u Crater, Kīlauea Volcano, Hawaii: Sulfur isotope analysis of samples from outside the Kīlauea summit crater lake
- Organization: Department of the Interior
- Updated: 2023-03-30T00:00:00Z
Samples from outside the crater lake were analyzed for their sulfur isotopic composition. Samples of sulfate alteration and native sulfur from the Kīlauea summit, Halema’uma’u crater (HMM), and...
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Search relevance: 54.42 | Views last month: 0
Federal
Temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from POLARSTERN in the South Atlantic Ocean and Southern Oceans from 1990-11-17 to 1990-12-30 (NCEI Accession 0117676)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2017-02-23T00:00:00.000+00:00
This dataset includes chemical, discrete sample, physical and profile data collected from POLARSTERN in the South Atlantic Ocean and Southern Oceans (> 60 degrees South) from 1990-11-17 to...
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Search relevance: 53.97 | Views last month: 0
Federal
Water temperature, salinity, delta carbon-13, oxygen, and others taken by CTD and water samples from the research vessel Thomas G. Thompson in the Indian Ocean and Southern Ocean from 2018-11-07 to 2018-12-12 (NCEI Accession 0219887)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2021-09-16T00:00:00.000+00:00
This dataset contains stable carbon isotope composition of DIC measured on seawater samples from the SE Indian/Southern Ocean as part of the CROCCA-2S cruise. Additional O2, temperature, salinity,...
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Search relevance: 53.53 | Views last month: 0
Federal
Partial pressure (or fugacity) of carbon dioxide, dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from KNORR in the North Atlantic Ocean and South Atlantic Ocean from 1987-11-24 to 1989-04-12 (NCEI Accession 0117501)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2017-02-22T00:00:00.000+00:00
This dataset includes chemical, discrete sample, meteorological, physical and profile data collected from KNORR in the North Atlantic Ocean and South Atlantic Ocean from 1987-11-24 to 1989-04-12....
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Search relevance: 53.11 | Views last month: 0
Federal
Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from MELVILLE in the Bering Sea, North Pacific Ocean and others from 1973-08-22 to 1974-06-09 (NCEI Accession 0163184)
- Organization: National Oceanic and Atmospheric Administration, Department of Commerce
- Updated: 2017-06-05T00:00:00.000+00:00
This dataset includes chemical, discrete sample, physical and profile data collected from MELVILLE in the Bering Sea, North Pacific Ocean, Papahānaumokuākea Marine National Monument, South Pacific...
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Search relevance: 52.83 | Views last month: 0

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