gov.noaa.nodc:0227949 eng utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2025-05-16T15:50:33Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Ecosystem carbon exchange and nitrogen removal rates in two 33-year-old constructed salt marshes are similar to those in a nearby natural marsh 2018-11-30 to 2020-03-08 (NCEI Accession 0227949) 2021-04-21 publication 2021-04-01 creation NOAA National Centers for Environmental Information gov.noaa.nodc:0227949 NCEI Archive Management System 0227949 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher Taylor Ledford Smithsonian Environmental Research Center (SERC) LedfordT@SI.edu https://serc.si.edu/ HTTPS Smithsonian Environmental Research Center (SERC) website Institution web page information resourceProvider University of Alabama (UA) resourceProvider Taylor Ledford University of Alabama (UA) LedfordT@SI.edu https://serc.si.edu/ HTTPS University of Alabama (UA) website Institution web page information pointOfContact Behzad Mortazavi University of Alabama (UA) principalInvestigator Corianne Tatariw University of Alabama (UA) ctatariw@au.edu collaborator Sommer Starr University of Alabama (UA) collaborator Erin Smyth University of Alabama (UA) collaborator Abigail Wood University of Alabama (UA) collaborator Loraé Simpson University of Alabama (UA) collaborator Julia A. Cherry University of Alabama (UA) collaborator Ledford, Taylor C. University of Alabama LedfordT@SI.edu https://serc.si.edu/ HTTPS University of Alabama (UA) website Institution web page information author Mortazavi, Behzad University of Alabama author Tatariw, Corianne University of Alabama ctatariw@au.edu author Starr, Sommer F. University of Alabama author Smyth, Erin University of Alabama author Wood, Abigail University of Alabama author Simpson, Loraé T. University of Alabama author Cherry, Julia A. University of Alabama author University of Alabama (UA) contributor tableDigital We conducted a year-long study with the main objective of comparing seasonal plant productivity, ecosystem respiration (ER), denitrification, and dissimilatory nitrate reduction to ammonium (DNRA) between two 33-year-old constructed marshes (CON-1, CON-2) and a nearby natural reference marsh (NAT). Marsh productivity was measured instantaneously as Net Ecosystem Exchange (NEE) using an acrylic chamber with an in-line carbon dioxide analyzer (LiCOR-820). Likewise, ER was measured in each marsh under dark conditions using the same chamber set-up. Gross ecosystem productivity (GEP) was calculated by taking the difference between NEE and ER. Negative values for NEE and GEP represent carbon dioxide flux into the marsh (i.e., CO2 sink), whereas positive ER values represent flux out of the marsh (i.e., CO2 source). Sediment samples were collected from each marsh to measure rates of dissimilatory nitrate reduction to ammonium (DNRA) and denitrification using a membrane inlet mass spectrometer. Plant biomass and soil organic matter were collected as an indicator for carbon stocks in each marsh. Nutrient stocks for phosphate, ammonium, nitrate + nitrite, and hydrogen sulfides from each marsh were measured from porewater samples taken from 10 cm depth in each marsh. This dataset is available to the public for a wide variety of uses including scientific research and analysis. Funding Agency: National Science Foundation (NSF) completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0227949 Preview graphic PNG 0227949 NCEI ACCESSION NUMBER 2021-03-03 publication AMMONIUM (NH4) BIOMASS Hydrogen Sulfide (H2S) nitrate + nitrite content (concentration) ORGANIC MATTER - WEIGHT PERCENT theme NODC DATA TYPES THESAURUS carbon dioxide (CO2) gas analyzer fluorometer mass spectrometer spectrophotometer instrument NODC INSTRUMENT TYPES THESAURUS in situ laboratory analyses theme NODC OBSERVATION TYPES THESAURUS University of Alabama dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS University of Alabama dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Gulf of Mexico place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication EARTH SCIENCE > BIOSPHERE > VEGETATION > BIOMASS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC MATTER theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page 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 information custodian Aboveground Biomass Anammox Potential Belowground Biomass Denitrification Potential Dissimilatory Nitrate reduction to Ammonium Potential Ecosystem Respiration Gross Ecosystem carbon dioxide production Net Ecosystem Carbon Dioxide Exchange Porewater Ammonium Porewater Extractable Ammonium Porewater Hydrogen Sulfides Porewater Nitrate + Nitrite Porewater Phosphate Soil Percent Organic Matter theme Provider Keywords CO2 ANALYZERS > CO2 ANALYZERS FLUOROMETERS > FLUOROMETERS MASS SPECTROMETERS > MASS SPECTROMETERS OPTSPEC > Optical Spectrometer instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page 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 information custodian Genesys 10S UV-vis spectrophotometer LiCor model LI-820 Membrane Inlet Mass Spectrometer Turner Designs 7200-002 fluorometer equipped with a CDOM/NH4+ UV module instrument Provider Instruments OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF AMERICA OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MEXICO place Global Change Master Directory (GCMD) Location Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page 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 information custodian U0P328 Send2NCEI Submission Package ID accessLevel: public otherRestrictions Cite as: Ledford, Taylor C.; Mortazavi, Behzad; Tatariw, Corianne; Starr, Sommer F.; Smyth, Erin; Wood, Abigail; Simpson, Loraé T.; Cherry, Julia A. (2021). Ecosystem carbon exchange and nitrogen removal rates in two 33-year-old constructed salt marshes are similar to those in a nearby natural marsh 2018-11-30 to 2020-03-08 (NCEI Accession 0227949). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0227949. Accessed [date]. Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. eng; USA utf8 environment oceans biota -88.162481 -88.149975 30.364743 30.36961 2018-11-30 2020-03-08 NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. Originator data format 0.232 https://www.ncei.noaa.gov/archive/accession/0227949 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/oas/227949 HTTPS Web browser Descriptive Information Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/download/227949 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0176/0227949/ FTP Any FTP client FTP 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). download dataset NCEI Accession 0227949 v1.1 was published. 2021-04-21T01:00:53Z NCEI Accession 0227949 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0227949/1.1 HTTPS NCEI Accession 0227949 v1.1 published 2021-04-21T01:00:53Z download dataset Parameter or Variable: Denitrification Potential (calculated); Units: micromoles of nitrogen per kilogram dry sediment per hour (µmol N kg-1 h-1) at 0-5 cm depths; Observation Category: laboratory analysis; Sampling Instrument: Membrane Inlet Mass Spectrometer Parameter or Variable: Anammox Potential (calculated); Units: micromoles of nitrogen per kilogram dry sediment per hour (µmol N kg-1 h-1) at 0-5 cm depths; Observation Category: laboratory analysis; Sampling Instrument: Membrane Inlet Mass Spectrometer Parameter or Variable: Dissimilatory Nitrate reduction to Ammonium Potential (measured); Units: micromoles of nitrogen per kilogram dry sediment per hour (µmol N kg-1 h-1) at 0-5 cm depths; Observation Category: laboratory analysis; Sampling Instrument: Membrane Inlet Mass Spectrometer Parameter or Variable: Porewater Extractable Ammonium (calculated); Units: nanomoles of nitrogen per gram dry sediment (nmol N g-1) at 0-5 cm depths; Observation Category: laboratory analysis; Sampling Instrument: Turner Designs 7200-002 fluorometer equipped with a CDOM/NH4+ UV module Parameter or Variable: Soil Percent Organic Matter (measured); Units: percent; Observation Category: laboratory analysis; Sampling Instrument: scale Parameter or Variable: Net Ecosystem Carbon Dioxide Exchange (measured); Units: micromoles per meter squared per second (µmol m-2 s-1); Observation Category: in situ; Sampling Instrument: LiCor model LI-820 Parameter or Variable: Ecosystem Respiration (measured); Units: micromoles per meter squared per second (µmol m-2 s-1); Observation Category: in situ; Sampling Instrument: LiCor model LI-820 Parameter or Variable: Gross Ecosystem carbon dioxide production (measured); Units: micromoles per meter squared per second (µmol m-2 s-1); Observation Category: in situ; Sampling Instrument: LiCor model LI-820 Parameter or Variable: Porewater Nitrate + Nitrite (calculated); Units: micromoles of nitrogen per liter water (µmol L-1) at a 10 cm depth; Observation Category: laboratory analysis; Sampling Instrument: Genesys 10S UV-vis spectrophotometer Parameter or Variable: Porewater Ammonium (calculated); Units: micromoles of nitrogen per liter water (µmol L-1) at a 10 cm depth; Observation Category: laboratory analysis; Sampling Instrument: Turner Designs 7200-002 fluorometer equipped with a CDOM/NH4+ UV module Parameter or Variable: Porewater Phosphate (calculated); Units: micromoles of phosphorus per liter water (µmol L-1) at a 10 cm depth; Observation Category: laboratory analysis; Sampling Instrument: Genesys 10S UV-vis spectrophotometer Parameter or Variable: Porewater Hydrogen Sulfides (calculated); Units: micromoles of sulfur per liter water (µmol L-1) at a 10 cm depth; Observation Category: laboratory analysis; Sampling Instrument: Genesys 10S UV-vis spectrophotometer Parameter or Variable: Aboveground Biomass (measured); Units: measured in kilograms per meter squared (kg m-2); Observation Category: in situ; Sampling Instrument: scale Parameter or Variable: Belowground Biomass (measured); Units: measured in kilograms per meter squared (kg m-2) at 15 cm depth; Observation Category: in situ; Sampling Instrument: scale asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian carbon dioxide (CO2) gas analyzer carbon dioxide (CO2) gas analyzer measures gaseous carbon dioxide Carbon dioxide gas analyzer has often been referred to as LI-COR, because a lot of researchers choose to use products manufactured by LI-COR incorporation for their carbon dioxide measurement. The main component of a carbon dioxide analyzer is a nondispersive infrared (NDIR) spectroscopic sensors to detect CO2 in a gaseous environment by its characteristic absorption. Carbon dioxide (CO2) gas analyzer works together with carbon dioxide (CO2) equilibrator (insttypes_id 184) to measure carbon dioxide in the water. To measure water carbon dioxide, water needs to be continuously supplied to a showerhead inside an equilibrator. As the water flows through the equilibrator chamber, dissolved carbon dioxide exchanges quickly with air in the headspace. This air is then sampled by the carbon dioxide analyzer to determine the mole fraction of CO2 in water. fluorometer fluorometer fluorometer mass spectrometer mass spectrometer Instrument that measure the massess and relative concentrations of atoms and molecules spectrophotometer spectrophotometer spectrophotometer, optical spectrometer, spectrograph or spectroscope An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. Butler, L. R. P.; Laqua, K. (1995). "Nomenclature, symbols, units and their usage in spectrochemical analysis-IX. Instrumentation for the spectral dispersion and isolation of optical radiation (IUPAC Recommendations 1995)". Pure Appl. Chem. IUPAC. 67 (10): 1725–1744. doi:10.1351/pac199567101725. A spectrometer is the general term for describing a combination of spectral apparatus with one or more detectors to measure the intensity of one or more spectral bands."