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https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_905357_v1 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_905357_v1.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_905357_v1/ public [pH internal Consistency Experiment: Measured pH and nutrients] - Measured pH and nutrient data acquired during the pH internal consistency experiment. (Improving Accuracy and Precision of Marine Inorganic Carbon Measurements) These data include the measured pHt, total alkalinity, dissolved inorganic carbon, raw pHt absorbance, and calculated pHt of 25 batches of seawater as a function of temperature, salinity, and pCO2. These data were used to evaluate the internal consistency of 120 different possible combinations of CO2 system constants. \n\nThe marine inorganic carbon system can be calculated with two measured parameters due to thermodynamic relationships. However, there are many different parameterizations for the required constants and the most accurate or best is not known. These data were used to evaluate the constants and make recommendations for which constants to use, and how to perform CO2 system calculations.\n\ncdm_data_type = Other\nVARIABLES:\nBatch (unitless)\nPractical_Salinity (unitless)\nTemp (degrees Celsius (˚C))\nmeas_pHt (unitless)\npHt_std_err (unitless)\nmeas_TA (micromoles per kilogram (µmol/kg))\nTA_std (micromoles per kilogram (µmol/kg))\nmeas_DIC (micromoles per kilogram (µmol/kg))\nDIC_std (micromoles per kilogram (µmol/kg))\nequilibrator_pCO2 (microatmospheres (µatm))\nPO4 (micromoles per kilogram (µmol/kg))\nPO4_stdev (micromoles per kilogram (µmol/kg))\nSi (micromoles per kilogram (µmol/kg))\nSi_stdev (micromoles per kilogram (µmol/kg))\n https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_905357_v1/index.htmlTable https://www.bco-dmo.org/dataset/905357 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_905357_v1.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_905357_v1&showErrors=false&email= BCO-DMO bcodmo_dataset_905357_v1
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_905235_v1 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_905235_v1.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_905235_v1/ public [pH internal Consistency Experiment: Raw pH Data] - Raw pH data acquired during the pH internal consistency experiment. (Improving Accuracy and Precision of Marine Inorganic Carbon Measurements) These data include the measured pHt, total alkalinity, dissolved inorganic carbon, raw pHt absorbance, and calculated pHt of 25 batches of seawater as a function of temperature, salinity, and pCO2. These data were used to evaluate the internal consistency of 120 different possible combinations of CO2 system constants.\n\nThe marine inorganic carbon system can be calculated with two measured parameters due to thermodynamic relationships. However, there are many different parameterizations for the required constants and the most accurate or best is not known. These data were used to evaluate the constants and make recommendations for which constants to use, and how to perform CO2 system calculations.\n\ncdm_data_type = Other\nVARIABLES:\nBatch (unitless)\nBottle (unitless)\nRep (unitless)\nPractical_Salinity (unitless)\nCalculated_Temperature (Degrees Celsius (˚C))\nMeasured_Temperature (Degrees Celsius (˚C))\nA434 (Absorbance units (AU))\nA578 (Absorbance units (AU))\nA730 (Absorbance units (AU))\nA488 (Absorbance units (AU))\nR (Absorbance units (AU))\nraw_pHt (unitless)\nflag (unitless)\nflag_reason (unitless)\n https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_905235_v1/index.htmlTable https://www.bco-dmo.org/dataset/905235 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_905235_v1.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_905235_v1&showErrors=false&email= BCO-DMO bcodmo_dataset_905235_v1
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_905278_v1 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_905278_v1.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_905278_v1/ public [pH internal Consistency Experiment: TA & DIC] -  (Improving Accuracy and Precision of Marine Inorganic Carbon Measurements) These data include the measured pHt, total alkalinity, dissolved inorganic carbon, raw pHt absorbance, and calculated pHt of 25 batches of seawater as a function of temperature, salinity, and pCO2. These data were used to evaluate the internal consistency of 120 different possible combinations of CO2 system constants. \n\nThe marine inorganic carbon system can be calculated with two measured parameters due to thermodynamic relationships. However, there are many different parameterizations for the required constants and the most accurate or best is not known. These data were used to evaluate the constants and make recommendations for which constants to use, and how to perform CO2 system calculations.\n\ncdm_data_type = Other\nVARIABLES:\nBatch (unitless)\nPractical_Salinity (unitless)\nmeas_TA (micromoles per kilogram (µmol/kg))\nmeas_DIC (micromoles per kilogram (µmol/kg))\n https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_905278_v1/index.htmlTable https://www.bco-dmo.org/dataset/905278 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_905278_v1.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_905278_v1&showErrors=false&email= BCO-DMO bcodmo_dataset_905278_v1
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_957644_v1 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_957644_v1.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_957644_v1/ public [TA HDPE glass bottle comparison] - Total alkalinity determined through experiments comparing usage of high-density polyethylene (HDPE) and borosilicate glass bottles for collection and storage of water samples collected on the GEOTRACES GP17-OCE cruise (R/V Roger Revelle RR2214) (US GEOTRACES GP17-OCE and GP17-ANT: Inorganic Carbon Cycling in the South Pacific and Southern Oceans by Direct Measurement) Total alkalinity plays an important role in buffering seawater and determining how much anthropogenic carbon dioxide the oceans can absorb and mitigate the rise in atmospheric concentrations. Total alkalinity varies with location, depth, and time making it an important variable needed to quantify and monitor ocean acidification, and potentially for ocean alkalinity enhancement interventions. Currently, best practices are to use expensive high quality borosilicate glass bottles for collecting and storing these samples. However, unlike other carbon system variables, total alkalinity is not affected by gas exchange meaning plastic bottles may be suitable for total alkalinity sample storage. Plastic bottles are lighter, cheaper, and less prone to breakage making them easier to handle and ship. Here, we test the suitability of high-density polyethylene (HDPE) for collection and long-term storage of total alkalinity samples. Duplicate samples were collected in standard borosilicate glass bottles and HDPE bottles on GEOTRACES GP17-OCE. The samples were analyzed in the laboratory over a year later and the storage methods were compared. It was determined that HDPE is not suitable for long-term storage of total alkalinity samples as there were large changes in total alkalinity over time and precision of duplicate samples was very poor. We hypothesize that HDPE plastic is slightly porous leading to leaching of alkalinity either into or out of the bottle over time impacting the value of the sample. Use of HDPE bottles for total alkalinity samples is not recommended for long term sample storage.\n\ncdm_data_type = Other\nVARIABLES:\nGEOTRACES_sample (unitless)\nEvent_number (unitless)\nDate (unitless)\ntime_unitless (Time, unitless)\ntime (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\nSample_ID (unitless)\nStation (unitless)\nCast (unitless)\nNiskin (unitless)\nlatitude (degrees_north)\n... (7 more variables)\n https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_957644_v1_fgdc.xml https://erddap.bco-dmo.org/erddap/metadata/iso19115/xml/bcodmo_dataset_957644_v1_iso19115.xml https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_957644_v1/index.htmlTable https://osprey.bco-dmo.org/dataset/957644 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_957644_v1.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_957644_v1&showErrors=false&email= BCO-DMO bcodmo_dataset_957644_v1

 
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