gov.noaa.nodc:0209238 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 2025-10-03T13:12:53Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Saltmarsh carbon and nitrogen cycling nutrient data in two northern Gulf of Mexico saltmarsh plants from 2017-2018 (NCEI Accession 0209238) 2020-05-08 publication 2020-03-09 creation International DOI Foundation (IDF) 10.25921/tm67-ca36 NOAA National Centers for Environmental Information gov.noaa.nodc:0209238 NCEI Archive Management System 0209238 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 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 Mason, Olivia U. Florida State University author University of Alabama (UA) contributor tableDigital This dataset contains salt marsh nutrient data to determine the biogeochemical impact of elevated nutrient loading on ecosystem carbon dynamics and nitrate reduction pathways (denitrification and dissimilatory nitrate reduction to ammonium (DNRA)) in plots dominated by either Juncus roemerianus or Spartina alterniflora that were colocated in a northern Gulf of Mexico salt marsh. The nutrients measured in this dataset include saltmarsh denitrification potential, anaerobic ammonium oxidation (anammox) potential, porewater nutrient concentrations, gross primary productivity, ecosystem respiration, and others. This data is available in CSV format. This dataset is available to the public for a wide variety of uses including scientific research and analysis. 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:0209238 Preview graphic PNG 0209238 NCEI ACCESSION NUMBER 2020-02-07 publication CHEMISTRY - SEDIMENT CHLOROPHYLL A NITROGEN SEDIMENT - POREWATER CHEMISTRY SEDIMENTS - TOTAL CARBON theme NODC DATA TYPES THESAURUS fluorometer 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 Coastal Waters of Alabama Gulf of Mexico place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication EARTH SCIENCE > OCEANS > MARINE SEDIMENTS EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > SEDIMENT CHEMISTRY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN 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 Anaeraobic ammonium oxidation (anammox) potential Denitrification potential Dissimilatory nitrate reduction to ammonium (DNRA) potential Ecosystem respiration (ER) Gross primary productivity (GPP) Juncus roemerianus Net ecosystem exchange (NEE) carbon flux Porewater ammonium (NH4+) concentration Porewater extractable ammonium (NH4+) Porewater hydrogen sulfide (H2S) concentration Porewater nitrate + nitrite (NOx) concentration Porewater phosphate (PO43-) concentration Saltmarsh Sediment Chlorophyll-a Sediment carbon content (%C) Sediment molar carbon to nitrogen ratio (C:N) Spartina alterniflora Vegetation molar carbon to nitrogen ratio (C:N) theme Provider Keywords FLUOROMETERS > FLUOROMETERS 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 Costech CHN analyzer model 4010 Genesys 10S UV-vis spectrophotometer LiCor LI-820 Membrane inlet mass spectrometer Turner Designs 700 fluorometer Turner Designs 7200-002 fluorometer equipped with a CDOM/NH4+ UV 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 MDE7PD Send2NCEI Submission Package ID accessLevel: public otherRestrictions Cite as: Ledford, Taylor C.; Mortazavi, Behzad; Tatariw, Corianne; Mason, Olivia U. (2020). Saltmarsh carbon and nitrogen cycling nutrient data in two northern Gulf of Mexico saltmarsh plants from 2017-2018 (NCEI Accession 0209238). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/tm67-ca36. 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 -88.12407 -88.123611 30.256717 30.257097 2017-04-07 2018-07-20 Salt marsh biogeochemical processes are regulated by ecosystem structure (e.g. plant community composition). However, plant-specific responses to stressors such as elevated nutrient inputs can have differing impacts on nitrogen (N) removal and carbon (C) sequestration. We conducted a field manipulation to investigate the impact of elevated nutrient loading on ecosystem C dynamics and nitrate reduction pathways (denitrification and dissimilatory nitrate reduction to ammonium (DNRA)) in plots dominated by either Juncus roemerianus or Spartina alterniflora that were collocated in a northern Gulf of Mexico salt marsh. We increased N and phosphorus (P) inputs by two- and three-times current levels in the region. Nutrient enrichment had no effect on net ecosystem exchange. However, a three-fold increase in nutrient input resulted in nearly one-third increases in gross primary productivity (GPP) and ecosystem respiration in S. alterniflora plots, whereas there was no impact in J. roemerianus plots. Denitrification increased in S. alterniflora plots 10-fold at both treatment levels relative to controls, but as with GPP, there was no response in J. roemerianus plots to higher nutrient inputs. In contrast, a three-fold increase in nutrients reduced DNRA by half in J. roemerianus plots. This work demonstrates that plant species-specific responses in marshes need to be considered for determining the impact of higher nutrient inputs on plant productivity and N-removal and retention. 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. CSV 0.252 https://doi.org/10.25921/tm67-ca36 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/209238 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/209238 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0155/0209238/ 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 0209238 v1.1 was published. 2020-05-08T18:40:52Z NCEI Accession 0209238 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0209238/1.1 HTTPS NCEI Accession 0209238 v1.1 published 2020-05-08T18:40:52Z download dataset Parameter or Variable: Denitrification potential (measured); Units: micromoles of nitrogen per kilogram dry sediment per hour (µmol N kg-1 h-1); Observation Category: laboratory analysis; Sampling Instrument: Membrane inlet mass spectrometer Parameter or Variable: anaeraobic ammonium oxidation (anammox) potential (measured); Units: micromoles of nitrogen per kilogram dry sediment per hour (µmol N kg-1 h-1); Observation Category: laboratory analysis; Sampling Instrument: Membrane inlet mass spectrometer Parameter or Variable: dissimilatory nitrate reduction to ammonium (DNRA) potential (measured); Units: micromoles of nitrogen per kilogram dry sediment per hour (µmol N kg-1 h-1); Observation Category: laboratory analysis; Sampling Instrument: Membrane inlet mass spectrometer Parameter or Variable: Sediment molar carbon to nitrogen ratio (C:N) (measured); Units: unitless; Observation Category: laboratory analysis; Sampling Instrument: Costech CHN analyzer model 4010 Parameter or Variable: Vegetation molar carbon to nitrogen ratio (C:N) (measured); Units: unitless; Observation Category: laboratory analysis; Sampling Instrument: Costech CHN analyzer model 4010 Parameter or Variable: Sediment carbon content (%C) (measured); Units: percent; Observation Category: laboratory analysis; Sampling Instrument: Costech CHN analyzer model 4010 Parameter or Variable: Porewater extractable ammonium (NH4+) (measured); Units: micromoles of nitrogen per gram dry sediment (µmol N g-1); Observation Category: laboratory analysis; Sampling Instrument: Turner Designs 7200-002 fluorometer equipped with a CDOM/NH4+ UV module Parameter or Variable: Sediment Chlorophyll-a (measured); Units: milligrams of chlorophyll a per meter squared (mg m-2); Observation Category: laboratory analysis; Sampling Instrument: Turner Designs 700 fluorometer was Parameter or Variable: Net ecosystem exchange (NEE) carbon flux (measured); Units: micromoles carbon per meter squared per second (µmol m-2 s-1); Observation Category: in situ; Sampling Instrument: LiCor LI-820 Parameter or Variable: Ecosystem respiration (ER) (measured); Units: micromoles carbon per meter squared per second (µmol m-2 s-1); Observation Category: in situ; Sampling Instrument: LiCor LI-820 Parameter or Variable: Gross primary productivity (GPP) (calculated); Units: micromoles carbon per meter squared per second (µmol m-2 s-1); Observation Category: in situ; Sampling Instrument: LiCor LI-820 Parameter or Variable: Porewater nitrate + nitrite (NOx) concentration (measured); Units: micromoles of nitrogen per liter water (µmol L-1); Observation Category: laboratory analysis; Sampling Instrument: Genesys 10S UV-vis spectrophotometer Parameter or Variable: Porewater ammonium (NH4+) concentration (measured); Units: micromoles of nitrogen per liter water (µmol L-1); Observation Category: laboratory analysis; Sampling Instrument: Turner Designs 7200-002 fluorometer equipped with a CDOM/NH4+ UV Parameter or Variable: Porewater phosphate (PO43-) concentration (measured); Units: micromoles of phosphorus per liter water (µmol L-1); Observation Category: laboratory analysis; Sampling Instrument: Genesys 10S UV-vis spectrophotometer Parameter or Variable: Porewater hydrogen sulfide (H2S) concentration (measured); Units: micromoles of sulfur per liter water (µmol L-1; Observation Category: laboratory analysis; Sampling Instrument: Genesys 10S UV-vis spectrophotometer asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian fluorometer fluorometer fluorometer 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."