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Title Sum-
RSS Institution Dataset ID
     data   graph     files  public Discrete bottle sample measurements for carbonate chemistry from samples collected in the
Sage Lot Pond salt marsh tidal creek in Waquoit Bay, MA from 2012 to 2015
   ?     I   M   background (external link) RSS BCO-DMO bcodmo_dataset_768577

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 Samples were collected from the Sage Lot Pond salt marsh tidal creek in
Waquoit Bay, MA at approx. 41.5546N, 70.5071W.

Discrete bottle samples were collected at ~30 cm above the bottom of the tidal
creek every 1-2 h at the sampling site using a peristaltic or diaphragm pump
for periods of a full tidal cycle (~12\u201314 h). DIC collection and analysis
followed standard best practice procedures outlined by Dickson et al. (2007).
Samples were collected through purgeable capsule filters with 0.45 \u03bcm
pore size (Farrwest Environmental Supply, Texas, USA) into 250 mL borosilicate
bottles, poisoned with 100 uL saturated mercuric chloride, sealed with a glass
stopper coated with APIEZON\u00ae \u2013 L grease, and se- cured with a rubber

DIC was analyzed using an Apollo SciTech DIC auto-analyzer (Model AS-C3),
which uses a nondispersive infrared (NDIR) method. The sample is acidified
with a 10% phosphoric acid in 10% sodium chloride solution, and CO2 is purged
with high purity nitrogen gas and measured by a LI-COR 7000 infrared analyzer
(LI-COR Environmental, Nebraska, USA). Certified Reference Material (CRM) from
Dr. A. Dickson at Scripps Institution of Oceanography was used to calibrate
the DIC auto-analyzer at least once daily. In addition, CRM was measured as a
sample every few hours to gauge and correct any potential drift. The precision
and accuracy of the instrument was ~ \u00b12.0 \u03bcmol kg-1.

TA was measured with an Apollo SciTech alkalinity auto-titrator (Model AS-
ALK2), a Ross combination pH electrode and a pH meter (ORION 3 Star) to
perform a modified Gran titration [Wang and Cai, 2004]. The electrode and
concentration of hydrochloric acid was calibrated every day. The CRMs were
also measured as samples every few hours to correct any potential small drift.
The accuracy and precision of the instrument was about \u00b1 2.0 \u03bcmol

An EXO2 Multiparameter Sonde (YSI Inc., Yellow Springs, OH) was submerged in
the tidal creek to measure temperature and salinity. The YSI EXO2 recorded at
intervals ranging from 2 min to 8 min. Reported YSI EXO2 sensor accuracy
specifications are: 1% of the reading for salinity and 0.05 \u00b0C for
attribute NC_GLOBAL awards_0_award_nid String 765031
attribute NC_GLOBAL awards_0_award_number String OCE-1459521
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1459521 (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 Dr Henrietta N Edmonds
attribute NC_GLOBAL awards_0_program_manager_nid String 51517
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Salt marsh carbonate chemistry
from discrete bottle samples
PI: Zhaohui Aleck Wang (WHOI)
Co-PIs: Kevin Kroeger & Meagan Gonneea (USGS)
Version date: 23-May-2019
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 2.2d 13 Jun 2019
attribute NC_GLOBAL date_created String 2019-05-24T17:09:22Z
attribute NC_GLOBAL date_modified String 2019-05-29T15:34:32Z
attribute NC_GLOBAL defaultDataQuery String &time
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.768577.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/768577 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String LI-COR LI-7000
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 768593
attribute NC_GLOBAL instruments_0_description String The LI-7000 CO2/H2O Gas Analyzer is a high performance, dual cell, differential gas analyzer. It was designed to expand on the capabilities of the LI-6262 CO2/ H2O Gas Analyzer. A dichroic beam splitter at the end of the optical path provides radiation to two separate detectors, one filtered to detect radiation absorption of CO2 and the other to detect absorption by H2O. The two separate detectors measure infrared absorption by CO2 and H2O in the same gas stream. The LI-7000 CO2/ H2O Gas Analyzer is a differential analyzer, in which a known concentration (which can be zero) gas is put in the reference cell, and an unknown gas is put in the sample cell.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/382/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String LI-COR LI-7000 Gas Analyzer
attribute NC_GLOBAL instruments_0_instrument_nid String 577
attribute NC_GLOBAL instruments_0_supplied_name String LI-COR 7000 infrared analyzer
attribute NC_GLOBAL instruments_1_acronym String Benchtop pH Meter
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 768594
attribute NC_GLOBAL instruments_1_description String An instrument consisting of an electronic voltmeter and pH-responsive electrode that gives a direct conversion of voltage differences to differences of pH at the measurement temperature. (McGraw-Hill Dictionary of Scientific and Technical Terms)
This instrument does not map to the NERC instrument vocabulary term for 'pH Sensor' which measures values in the water column. Benchtop models are typically employed for stationary lab applications.
attribute NC_GLOBAL instruments_1_instrument_name String Benchtop pH Meter
attribute NC_GLOBAL instruments_1_instrument_nid String 681
attribute NC_GLOBAL instruments_1_supplied_name String ORION 3 Star pH meter
attribute NC_GLOBAL instruments_2_acronym String Automatic titrator
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 768588
attribute NC_GLOBAL instruments_2_description String Instruments that incrementally add quantified aliquots of a reagent to a sample until the end-point of a chemical reaction is reached.
attribute NC_GLOBAL instruments_2_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB12/ (external link)
attribute NC_GLOBAL instruments_2_instrument_name String Automatic titrator
attribute NC_GLOBAL instruments_2_instrument_nid String 682
attribute NC_GLOBAL instruments_2_supplied_name String Apollo SciTech alkalinity auto-titrator (Model AS-ALK2)
attribute NC_GLOBAL instruments_3_dataset_instrument_nid String 768589
attribute NC_GLOBAL instruments_3_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_3_instrument_name String Pump
attribute NC_GLOBAL instruments_3_instrument_nid String 726
attribute NC_GLOBAL instruments_3_supplied_name String peristaltic or diaphragm pump
attribute NC_GLOBAL instruments_4_acronym String Apollo SciTech AS-C3
attribute NC_GLOBAL instruments_4_dataset_instrument_nid String 768592
attribute NC_GLOBAL instruments_4_description String A Dissolved Inorganic Carbon (DIC) analyser, for use in aquatic carbon dioxide parameter analysis of coastal waters, sediment pore-waters, and time-series incubation samples. The analyser consists of a solid state infrared CO2 detector, a mass-flow controller, and a digital pump for transferring accurate amounts of reagent and sample. The analyser uses an electronic cooling system to keep the reactor temperature below 3 degrees Celsius, and a Nagion dry tube to reduce the water vapour and keep the analyser drift-free and maintenance-free for longer. The analyser can handle sample volumes from 0.1 - 1.5 millilitres, however the best results are obtained from sample volumes between 0.5 - 1 millilitres. It takes approximately 3 minutes per analysis, and measurement precision is plus or minus 2 micromoles per kilogram or higher for surface seawater. It is designed for both land based and shipboard laboratory use.
attribute NC_GLOBAL instruments_4_instrument_name String Apollo SciTech AS-C3 Dissolved Inorganic Carbon (DIC) analyser
attribute NC_GLOBAL instruments_4_instrument_nid String 768590
attribute NC_GLOBAL instruments_4_supplied_name String Apollo SciTech DIC auto-analyzer (Model AS-C3)
attribute NC_GLOBAL instruments_5_acronym String YSI EXO
attribute NC_GLOBAL instruments_5_dataset_instrument_nid String 768597
attribute NC_GLOBAL instruments_5_description String Comprehensive multi-parameter, water-quality monitoring sondes designed for long-term monitoring, profiling and spot sampling. The EXO sondes are split into several categories: EXO1 Sonde, EXO2 Sonde, EXO3 Sonde. Each category has a slightly different design purpose with the the EXO2 and EXO3 containing more sensor ports than the EXO1. Data are collected using up to four user-replaceable sensors and an integral pressure transducer. Users communicate with the sonde via a field cable to an EXO Handheld, via Bluetooth wireless connection to a PC, or a USB connection to a PC. Typical parameter specifications for relevant sensors include dissolved oxygen with ranges of 0-50 mg/l, with a resolution of +/- 0.1 mg/l, an accuracy of 1 percent of reading for values between 0-20 mg/l and an accuracy of +/- 5 percent of reading for values 20-50 mg/l. Temp ranges are from-5 to +50 degC, with an accuracy of +/- 0.001 degC. Conductivity has a range of 0-200 mS/cm, with an accuracy of +/-0.5 percent of reading + 0.001 mS/cm and a resolution of 0.0001 - 0.01 mS/cm.
attribute NC_GLOBAL instruments_5_instrument_name String YSI EXO multiparameter water quality sondes
attribute NC_GLOBAL instruments_5_instrument_nid String 768595
attribute NC_GLOBAL instruments_5_supplied_name String EXO2 Multiparameter Sonde (YSI Inc., Yellow Springs, OH)
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, data, dataset, date, density, dic, dmo, earth, Earth Science > Oceans > Salinity/Density > Salinity, erddap, iso, management, ocean, oceanography, oceans, office, practical, preliminary, salinity, science, sea, sea_water_practical_salinity, seawater, temperature, time, water
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/768577 (external link)
attribute NC_GLOBAL param_mapping String {'768577': {'ISO_DateTime_UTC': 'master - time'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/768577/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_0_affiliation_acronym String WHOI
attribute NC_GLOBAL people_0_person_name String Zhaohui Aleck Wang
attribute NC_GLOBAL people_0_person_nid String 51347
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 United States Geological Survey
attribute NC_GLOBAL people_1_affiliation_acronym String USGS
attribute NC_GLOBAL people_1_person_name String Meagan Gonneea
attribute NC_GLOBAL people_1_person_nid String 768545
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 United States Geological Survey
attribute NC_GLOBAL people_2_affiliation_acronym String USGS
attribute NC_GLOBAL people_2_person_name String Kevin Kroeger
attribute NC_GLOBAL people_2_person_nid String 768544
attribute NC_GLOBAL people_2_role String Co-Principal Investigator
attribute NC_GLOBAL people_2_role_type String originator
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 Shannon Rauch
attribute NC_GLOBAL people_3_person_nid String 51498
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 Collaborative Research: The Paradox of Salt Marshes as a Source of Alkalinity and Low pH, High Carbon Dioxide Water to the Ocean: A First In-depth Study of A Diminishing Source
attribute NC_GLOBAL projects_0_acronym String Salt Marsh Paradox
attribute NC_GLOBAL projects_0_description String NSF Award Abstract:
Carbon production in vegetated coastal systems such as marshes is among the highest in the biosphere. Resolving carbon production from marshes and assessing their impacts on coastal carbon cycling are critical to determining the long-term impacts of global change such as ocean acidification and eutrophication. In this project, researchers will use new methods to improve the assessment of carbon production from salt marshes. The overarching goals are to understand the role of coastal wetlands in altering carbonate chemistry, alkalinity, and carbon budgets of the coastal ocean, as well as their capacity to buffer against anthropogenically driven chemical changes, such as ocean acidification. This project will involve training for undergraduate, graduate, and postdoctoral researchers, and will provide educational opportunities for students from a local Native American tribe.

Tidal water, after exchange with intertidal salt marshes, contains higher total alkalinity (TA), higher carbon dioxide, but lower pH. These highly productive, vegetated wetlands are deemed to export both alkalinity and dissolved inorganic carbon (DIC) to the ocean. This creates an apppartent paradox in that salt marshes are both an acidifying and alkalizing source to the ocean. Limited studies suggest that marsh DIC and alkalinity export fluxes may be a significant player in regional and global carbon budgets, but the current estimates are still far too uncertain to be conclusive. Unfortunately, tidal marsh ecosystems have dramatically diminished in the recent past, and are likely to diminish further due to sea level rise, land development, eutrophication, and other anthropogenic pressures. To assess the potential impacts of this future change, it is imperative to understand its current status and accurately evaluate its significatce to other parts of the carbon cycle. Similarly, little is know about the distinct sources of DIC and alkalinity being exported from marshes via tidal exchange, although aerobic and various anaerobic respiration processes have been indicated. In this study, researchers will undertake an in-depth study using new methods to vastly improve export fluxes from intertidal salt marshes through tidal exchange over minutes to annual scales, characterize and evaluate the compostiion (carbonate versus non-carbonate alkalinity) of marsh exported TA, the role and significance of the DOC pool in altering carbonate chemistry and export fluxes, identify sources of DIC being exported in tidal water, and investigate how marsh export of TA and DIC impacts carbonate chemistry and the carbon and alkalinity budgets in coastal waters.
attribute NC_GLOBAL projects_0_end_date String 2019-02
attribute NC_GLOBAL projects_0_geolocation String Sage Lot Pond salt marsh tidal creek in Waquoit Bay, MA at approx. 41.5546N, -70.5071W
attribute NC_GLOBAL projects_0_name String Collaborative Research: The Paradox of Salt Marshes as a Source of Alkalinity and Low pH, High Carbon Dioxide Water to the Ocean: A First In-depth Study of A Diminishing Source
attribute NC_GLOBAL projects_0_project_nid String 765032
attribute NC_GLOBAL projects_0_start_date String 2015-03
attribute NC_GLOBAL publisher_name String Shannon Rauch
attribute NC_GLOBAL publisher_role String BCO-DMO Data Manager(s)
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v29
attribute NC_GLOBAL summary String Discrete bottle sample measurements for carbonate chemistry from samples collected in the Sage Lot Pond salt marsh tidal creek in Waquoit Bay, MA from 2012 to 2015.
attribute NC_GLOBAL time_coverage_end String 2015-12-16T19:32:00Z
attribute NC_GLOBAL time_coverage_start String 2012-04-09T13:04:00Z
attribute NC_GLOBAL title String Discrete bottle sample measurements for carbonate chemistry from samples collected in the Sage Lot Pond salt marsh tidal creek in Waquoit Bay, MA from 2012 to 2015
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.5-beta
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.33397664E9, 1.45029432E9
attribute time axis String T
attribute time description String Date and time (UTC) formatted to ISO 8601 standard. Format: yyyy-mm-ddTHH:MM:SS
attribute time ioos_category String Time
attribute time long_name String ISO Date Time UTC
attribute time source_name String ISO_DateTime_UTC
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
variable DIC   float  
attribute DIC _FillValue float NaN
attribute DIC actual_range float 1366.85, 2548.9
attribute DIC description String Dissolved inorganic carbon (DIC)
attribute DIC ioos_category String Unknown
attribute DIC long_name String DIC
attribute DIC units String micromoles per kilogram (umol kg-1)
variable TA   float  
attribute TA _FillValue float NaN
attribute TA actual_range float 1330.34, 2279.87
attribute TA description String Total alkalinity
attribute TA ioos_category String Unknown
attribute TA long_name String TA
attribute TA units String micromoles per kilogram (umol kg-1)
variable TEMPERATURE   float  
attribute TEMPERATURE _FillValue float NaN
attribute TEMPERATURE actual_range float 4.41, 29.54
attribute TEMPERATURE description String Water temperature
attribute TEMPERATURE ioos_category String Temperature
attribute TEMPERATURE long_name String TEMPERATURE
attribute TEMPERATURE units String degrees Celsius
variable SALINITY   float  
attribute SALINITY _FillValue float NaN
attribute SALINITY actual_range float 8.84, 31.96
attribute SALINITY colorBarMaximum double 37.0
attribute SALINITY colorBarMinimum double 32.0
attribute SALINITY description String Water salinity
attribute SALINITY ioos_category String Salinity
attribute SALINITY long_name String Sea Water Practical Salinity
attribute SALINITY units String practical salinity scale

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

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