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Title Sum-
Institution Dataset ID
     data   graph     files  public Sensor measurements for dissolved inorganic carbon from the Sage Lot Pond salt marsh tidal
creek in Waquoit Bay, MA from July to December 2015
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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 Samples were collected from the Sage Lot Pond salt marsh tidal creek in
Waquoit Bay, MA at approx. 41.5546N, 70.5071W.

In situ, high-frequency sensors for DIC and salinity were deployed at the
mouth of the tidal creek in Sage Lot Pond at the latitude and longitude listed
in the location above. DIC was measured with an autonomous sensor called
CHANnelized Optical Sensor (CHANOS). 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 temperature. CHANOS was placed on a platform
atop the marsh adjacent to the creek with the inlet pumping from the creek at
the same depth and within 30 cm of the EXO2 Sonde. This setup avoided any
interference by CHANOS on water flow in the creek. There is no significant
concentration difference with depth in the creek (data not shown). In order to
prevent fouling, sample water was filtered by a 100\u03bcm plastic disc filter
(Keller Products, Acton, MA) followed by a copper mesh filter. CHANOS was
powered by two 12 V batteries that were charged with two 250W solar panels
(Renogy, Ontario, CA).

CHANOS uses spectrophotometric principles to measure DIC and pH using two
independent channels (Wang et al., 2015). Briefly, CHANOS consisted of syringe
pumps for delivery of reagents, junction boxes containing valves, thermistors,
and optical and fluidic components for DIC and pH analysis, and an electronics
housing, as well as reagent bags for storage of CRM, hydrochloric acid,
reference solution, and pH- sensitive indicator solution. For this study, only
[DIC] measurements were used. The DIC channel uses an improved
spectrophotometric method described in detail in Wang et al. (2013) whereby a
countercurrent flow configuration between acidified seawater and a pH-
sensitive indicator solution in a tube-in-tube design achieves fast,
continuous CO2 equilibration across highly CO2-permeable Teflon AF 2400
tubing. After CO2 exchange in the countercurrent flow cell, the indicator
solution is directed into an optical cell for detection. Each measurement
cycle is ~15min. The system achieved a precision of ~ \u00b1 2.5 \u03bcmol
kg-1 and an accuracy of ~ \u00b1 5.0 \u03bcmol kg-1 during coastal deployments
(Wang et al., 2015).
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 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 continuous DIC
measured by CHANnelized Optical Sensor (CHANOS)
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 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2019-05-24T19:54:34Z
attribute NC_GLOBAL date_modified String 2019-05-29T15:35:39Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.768607.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/768607 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String YSI EXO
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 768617
attribute NC_GLOBAL instruments_0_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_0_instrument_name String YSI EXO multiparameter water quality sondes
attribute NC_GLOBAL instruments_0_instrument_nid String 768595
attribute NC_GLOBAL instruments_0_supplied_name String EXO2 Multiparameter Sonde (YSI Inc., Yellow Springs, OH)
attribute NC_GLOBAL instruments_1_acronym String CHANOS
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 768619
attribute NC_GLOBAL instruments_1_description String CHANOS uses spectrophotometric principles to measure DIC and pH using two independent channels (Wang et al., 2015). Briefly, CHANOS consisted of syringe pumps for delivery of reagents, junction boxes containing valves, thermistors, and optical and fluidic components for DIC and pH analysis, and an electronics housing, as well as reagent bags for storage of CRM, hydrochloric acid, reference solution, and pH- sensitive indicator solution. 

Refer to Wang et al. (2015) doi: 10.1021/es504893n
attribute NC_GLOBAL instruments_1_instrument_name String CHANnelized Optical Sensor
attribute NC_GLOBAL instruments_1_instrument_nid String 768618
attribute NC_GLOBAL instruments_1_supplied_name String CHANnelized Optical Sensor
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chanosdic, chemical, data, dataset, date, density, 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 https://www.bco-dmo.org/dataset/768607/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/768607 (external link)
attribute NC_GLOBAL param_mapping String {'768607': {'ISO_DateTime_UTC': 'flag - time'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/768607/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 Salt Marsh Paradox
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 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 Sensor measurements for dissolved inorganic carbon from the Sage Lot Pond salt marsh tidal creek in Waquoit Bay, MA from July to December 2015. DIC was measured with an autonomous sensor called CHANnelized Optical Sensor (CHANOS).
attribute NC_GLOBAL time_coverage_end String 2015-12-18T15:15:00Z
attribute NC_GLOBAL time_coverage_start String 2015-07-07T20:15:00Z
attribute NC_GLOBAL title String Sensor measurements for dissolved inorganic carbon from the Sage Lot Pond salt marsh tidal creek in Waquoit Bay, MA from July to December 2015
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.4363001E9, 1.4504517E9
attribute time axis String T
attribute time bcodmo_name String date
attribute time description String Date and time (UTC) formatted to ISO8601 standard. Format: yyyy-mm-ddTHH:MM
attribute time ioos_category String Time
attribute time long_name String ISO Date Time UTC
attribute time nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
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 time_precision String 1970-01-01T00:00:00Z
attribute time units String seconds since 1970-01-01T00:00:00Z
variable TEMPERATURE   float  
attribute TEMPERATURE _FillValue float NaN
attribute TEMPERATURE actual_range float 4.85, 30.61
attribute TEMPERATURE bcodmo_name String temperature
attribute TEMPERATURE description String Water temperature
attribute TEMPERATURE long_name String TEMPERATURE
attribute TEMPERATURE nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/TEMPP901/ (external link)
attribute TEMPERATURE units String degrees Celsius
variable SALINITY   float  
attribute SALINITY _FillValue float NaN
attribute SALINITY actual_range float 14.47, 32.65
attribute SALINITY bcodmo_name String sal
attribute SALINITY colorBarMaximum double 37.0
attribute SALINITY colorBarMinimum double 32.0
attribute SALINITY description String Water salinity
attribute SALINITY long_name String Sea Water Practical Salinity
attribute SALINITY nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/PSALST01/ (external link)
attribute SALINITY units String practical salinity scale
variable CHANOSDIC   float  
attribute CHANOSDIC _FillValue float NaN
attribute CHANOSDIC actual_range float 1246.12, 2482.21
attribute CHANOSDIC bcodmo_name String DIC
attribute CHANOSDIC description String Dissolved inorganic carbon
attribute CHANOSDIC long_name String CHANOSDIC
attribute CHANOSDIC units String micromoles per kilogram (umol/kg)

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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