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Title Sum-
Institution Dataset ID
     data   graph     files  public Sediment oxygen demand and ammonium, nitrate plus nitrate, and phosphate flux data from
Little Lagoon, Alabama
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL access_formats String .htmlTable,.csv,.json,.mat,.nc,.tsv
attribute NC_GLOBAL acquisition_description String Little Lagoon is a shallow coastal lagoon that is tidally connected to the
Gulf of Mexico but has no riverine inputs. The water in the lagoon is
replenished solely from precipitation and groundwater inputs primarily on the
East end (Su et al. 2012). Because of the rapid development in Baldwin County,
a large amount of NO3- enters the Little Lagoon system through SGD (Murgulet &
Tick 2008). In this region, there can be rapid changes in the depth to
groundwater (Fig. 4.1 inset) and episodic SGD inputs to the lagoon (Su et
al.2013). Within the lagoon, three sites were selected (East, Mouth, and West)
to represent the gradient that exists across the lagoon from the input of
groundwater. Sites were sampled on a near-monthly basis from February 2012 to
February 2013.

Benthic fluxes from intact sediment cores

At each site triplicate intact sediment cores (270 mm x 95 mm ID; 190 mm
sediment, 50 mm water column) were collected and setup in a flow-through
system (Lavrentyev et al. 2000) in a darkened environmental chamber set to the
average site temperature within 8 hours of collection. The flow-through system
consisted of a multichannel proportioning pump that sent 0.7 micron filtered
and ~100 \u03bcM Na15NO3 - (99 atom %) enriched site water
(\u201cinflow\u201d) at a continuous flow rate (1.2 mL min-1) to the overlying
water above the sediment surface. The positive displacement of the overlying
water exited the core through an outflow tube (\u201coutflow\u201d) and
collected in a reservoir. The volume of water overlying each sediment core was
exchanged five times during a 24-hour incubation period to equilibrate the
cores (Eyre et al. 2002). After the initial 24 hours, triplicate inflow and
outflow samples were collected at 36 hours for dissolved gas and nutrient
analysis. Dissolved gas analysis followed the modified Isotope pairing
technique (IPT) (Nielsen 1992, Risgaard-Petersen et al. 2003). In this
approach, rates of 29N2 and 30N2 production from 15NO3 - are quantified and
used to calculate rates of 14N2 production (p14) (equation 1, below); when
combined with 15N tracer slurry incubations (below), rates of anammox, and the
relative contribution of anammox and denitrification to p14 can be determined
(equations 2-4, below).

Water samples were collected in 12 mL Exetainers, allowing the vial to
overflow two times the tube volume prior to preservation with 250 \u03bcL of
50% (w/v) ZnCl2 before being capped. Samples were stored under water in the
environmental chamber until dissolved gas analysis on a membrane inlet mass
spectrometer (MIMS) equipped with a copper reduction column set at 600oC to
remove oxygen (O2) (Kana et al. 1998, Eyre et al. 2002). Benthic nutrient flux
samples were filtered (0.7 micron) and immediately frozen until DIN (NO2 -,
NO3 -, NH4 +) and PO4 3- analyses as described above.

Sediment oxygen demand (SOD) was measured from oxygen concentrations in inflow
and outflow water analyzed with a calibrated microelectrode and a Unisense
\u00ae multimeter analyzer. Denitrification and benthic flux calculations
(\u03bcmol m-2 hr-1) determined flux into or out of the sediment using the
influent and effluent concentrations, flow rate (1.2 ml min-1), and the
surface area of the sediment (0.00708 m-2). All rates and fluxes pertaining to
N species are expressed on a N atom basis. A positive flux indicates release
from the sediments to the water column and a negative flux indicates uptake by
the sediment.

Additional methodology can be found in:

Bernard, Rebecca & Mortazavi, Behzad & A. Kleinhuizen, Alice. (2015).
Dissimilatory nitrate reduction to ammonium (DNRA) seasonally dominates
NO3\u2212 reduction pathways in an anthropogenically impacted sub-tropical
coastal lagoon. Biogeochemistry. 125.
attribute NC_GLOBAL awards_0_award_nid String 497637
attribute NC_GLOBAL awards_0_award_number String OCE-0962008
attribute NC_GLOBAL awards_0_data_url String http://nsf.gov/awardsearch/showAward?AWD_ID=0962008 (external link)
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_0_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_0_funding_source_nid String 355
attribute NC_GLOBAL awards_0_program_manager String David L. Garrison
attribute NC_GLOBAL awards_0_program_manager_nid String 50534
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Benthic Flux
B. Mortazavi and W. Burnett, PIs
Version 16 January 2018
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL data_source String extract_data_as_tsv version 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2018-01-17T20:12:09Z
attribute NC_GLOBAL date_modified String 2019-03-15T14:17:51Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.723984.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/723984 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String Gas Analyzer
attribute NC_GLOBAL instruments_0_dataset_instrument_description String Used to analyze sediment oxygen demand
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 724404
attribute NC_GLOBAL instruments_0_description String Gas Analyzers - Instruments for determining the qualitative and quantitative composition of gas mixtures.
attribute NC_GLOBAL instruments_0_instrument_name String Gas Analyzer
attribute NC_GLOBAL instruments_0_instrument_nid String 720
attribute NC_GLOBAL instruments_0_supplied_name String Unisense multimeter analyzer
attribute NC_GLOBAL instruments_1_dataset_instrument_description String Used to filter sediment cores
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 724402
attribute NC_GLOBAL instruments_1_description String A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps
attribute NC_GLOBAL instruments_1_instrument_name String Pump
attribute NC_GLOBAL instruments_1_instrument_nid String 726
attribute NC_GLOBAL instruments_1_supplied_name String Multichannel proportioning pump
attribute NC_GLOBAL instruments_2_acronym String MIMS
attribute NC_GLOBAL instruments_2_dataset_instrument_description String Used for dissolved gas analysis
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 724403
attribute NC_GLOBAL instruments_2_description String Membrane-introduction mass spectrometry (MIMS) is a method of introducing analytes into the mass spectrometer's vacuum chamber via a semipermeable membrane.
attribute NC_GLOBAL instruments_2_instrument_name String Membrane Inlet Mass Spectrometer
attribute NC_GLOBAL instruments_2_instrument_nid String 661606
attribute NC_GLOBAL instruments_2_supplied_name String MIMS
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, data, dataset, date, description, dmo, east, East_SE, erddap, management, mouth, Mouth_SE, oceanography, office, preliminary, value, Value_Description, west, West_SE, year
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/723984/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/723984 (external link)
attribute NC_GLOBAL param_mapping String {'723984': {}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/723984/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String National Science Foundation
attribute NC_GLOBAL people_0_affiliation_acronym String NSF-DEB
attribute NC_GLOBAL people_0_person_name String Dr Behzad Mortazavi
attribute NC_GLOBAL people_0_person_nid String 491316
attribute NC_GLOBAL people_0_role String Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String Florida State University
attribute NC_GLOBAL people_1_affiliation_acronym String FSU - EOAS
attribute NC_GLOBAL people_1_person_name String Dr William C. Burnett
attribute NC_GLOBAL people_1_person_nid String 491315
attribute NC_GLOBAL people_1_role String Co-Principal Investigator
attribute NC_GLOBAL people_1_role_type String originator
attribute NC_GLOBAL people_2_affiliation String National Science Foundation
attribute NC_GLOBAL people_2_affiliation_acronym String NSF-DEB
attribute NC_GLOBAL people_2_person_name String Dr Behzad Mortazavi
attribute NC_GLOBAL people_2_person_nid String 491316
attribute NC_GLOBAL people_2_role String Contact
attribute NC_GLOBAL people_2_role_type String related
attribute NC_GLOBAL people_3_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_3_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_3_person_name String Hannah Ake
attribute NC_GLOBAL people_3_person_nid String 650173
attribute NC_GLOBAL people_3_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_3_role_type String related
attribute NC_GLOBAL project String LittleLagoonGroundwater
attribute NC_GLOBAL projects_0_acronym String LittleLagoonGroundwater
attribute NC_GLOBAL projects_0_description String This project investigated the link between submarine groundwater discharge (SGD) and microalgal dynamics in Little Lagoon, Alabama.  In contrast to most near-shore environments, it is fully accessible; has no riverine inputs; and is large enough to display ecological diversity (c. 14x 0.75 km) yet small enough to be comprehensively sampled on appropriate temporal and spatial scales. The PIs have previously demonstrated that the lagoon is a hot-spot for toxic blooms of the diatom Pseudo-nitzchia spp. that are correlated with discharge from the surficial aquifer. This project assessed variability in SGD, the dependence of benthic nutrient fluxes on microphytobenthos (MPB) abundance and productivity, and the response of the phytoplankton to nutrient enrichment and dilution. The work integrated multiple temporal and spatial scales and demonstrated both the relative importance of SGD vs. benthic recycling as a source of nutrients, and the role of SGD in structuring the microalgal community. (paraphrased from Award abstract)
attribute NC_GLOBAL projects_0_end_date String 2014-08
attribute NC_GLOBAL projects_0_geolocation String southern Alabama, east of Mobile
attribute NC_GLOBAL projects_0_name String Groundwater Discharge, Benthic Coupling and Microalgal Community Structure in a Shallow Coastal Lagoon
attribute NC_GLOBAL projects_0_project_nid String 491318
attribute NC_GLOBAL projects_0_start_date String 2010-03
attribute NC_GLOBAL publisher_name String Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String Sediment oxygen demand and ammonium, nitrate plus nitrate, and phosphate flux data from Little Lagoon, Alabama from 2010-2013
attribute NC_GLOBAL title String Sediment oxygen demand and ammonium, nitrate plus nitrate, and phosphate flux data from Little Lagoon, Alabama
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Year   byte  
attribute Year _FillValue byte 127
attribute Year actual_range byte 1, 2
attribute Year bcodmo_name String unknown
attribute Year description String Year ID that samples were taken
attribute Year long_name String Year
attribute Year units String unitless
variable Value_Description   String  
attribute Value_Description bcodmo_name String unknown
attribute Value_Description description String Description of the measurment taken; description includes relevant units for each sample taken.
attribute Value_Description long_name String Value Description
attribute Value_Description units String unitless
variable Date   String  
attribute Date bcodmo_name String date
attribute Date description String Month and day that samples were taken; MMM-DD
attribute Date long_name String Date
attribute Date nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute Date units String unitless
variable East   float  
attribute East _FillValue float NaN
attribute East actual_range float -8369.1, 16171.0
attribute East bcodmo_name String unknown
attribute East description String Benthic flux values from the East site; location of site is 30.253347, -87.724729
attribute East long_name String East
attribute East units String umol m-2 hr-1; umol m-2 d-1
variable East_SE   float  
attribute East_SE _FillValue float NaN
attribute East_SE actual_range float 0.02, 2587.7
attribute East_SE bcodmo_name String unknown
attribute East_SE description String Standard error of the benthic flux values from the East site
attribute East_SE long_name String East SE
attribute East_SE units String umol m-2 hr-1; umol m-2 d-1
variable Mouth   float  
attribute Mouth _FillValue float NaN
attribute Mouth actual_range float -7083.4, 12198.9
attribute Mouth bcodmo_name String unknown
attribute Mouth description String Benthic flux values from the Mouth site; location of site is 30.243683, -87.738407
attribute Mouth long_name String Mouth
attribute Mouth units String umol m-2 hr-1; umol m-2 d-1
variable Mouth_SE   float  
attribute Mouth_SE _FillValue float NaN
attribute Mouth_SE actual_range float 0.03, 1680.1
attribute Mouth_SE bcodmo_name String unknown
attribute Mouth_SE description String Standard error of the benthic flux values from the Mouth site
attribute Mouth_SE long_name String Mouth SE
attribute Mouth_SE units String umol m-2 hr-1; umol m-2 d-1
variable West   float  
attribute West _FillValue float NaN
attribute West actual_range float -9539.0, 22500.5
attribute West bcodmo_name String unknown
attribute West description String Benthic flux values from the West site; location of site is 30.247181, -87.767856
attribute West long_name String West
attribute West units String umol m-2 hr-1; umol m-2 d-1
variable West_SE   float  
attribute West_SE _FillValue float NaN
attribute West_SE actual_range float 0.03, 5017.6
attribute West_SE bcodmo_name String unknown
attribute West_SE description String Standard error of the benthic flux values from the West site
attribute West_SE long_name String West SE
attribute West_SE units String umol m-2 hr-1; umol m-2 d-1

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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