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    • Water Chemistry and Shallow Water Conductivity-Temperature-Depth (CTD) Profiles for select locations across Batangas, Philippines from 2012 to 2015

    Metadata Updated: May 24, 2025

    The water chemistry data described here are from discrete water samples collected by the NOAA Coral Reef Ecosystem Program (CREP), to assess the seawater carbonate systems at fixed climate survey sites located in coral reef habitats in the Philippines in 2012, 2013, and 2015. Climate sites were established by CREP to assess multiple features of the coral reef environment (in addition to the data described herein) over time. In 2015, conductivity-temperature-depth (CTD) casts were also performed to characterize the spatial structure of the physical and chemical properties of the ocean environment influencing the living coral reef resources. These water chemistry and CTD data provide a baseline for tracking reef carbonate system changes due to globally increasing levels of atmospheric carbon dioxide. The data can be accessed online via the NOAA National Centers for Environmental Information (NCEI) Ocean Archive.

    To survey water chemistry, SCUBA divers collected two discrete water samples from each site; one at the reef and one at the surface directly above the reef. The samples were processed by CREP and sent to NOAA Pacific Marine Environmental Laboratory (PMEL) to be analyzed for total alkalinity (TA) and dissolved inorganic carbon (DIC). From these constituents, alongside temperature, salinity, and depth data, other parameters of the seawater carbonate system can be calculated.

    CTD data are collected by lowering the CTD in a profiling mode from a small boat, resulting in vertical profiles (max 18 meter depth, downcast only) of water column conductivity, temperature, and pressure. Vertical profiles of temperature, salinity, and turbidity resulting from CTD casts provide indicators for local seawater chemistry changes.

    In addition to these discrete samples, water samples were collected as part of CREP's ocean acidification diurnal suite, which also includes vertical profiles from CTD casts, current direction and magnitude from an Acoustic Doppler Current Profiler, and pH from an SeaFET sensor. The data associated with the diurnal suite are documented and archived separately; The data associated with the diurnal suite is documented and archived separately with metadata available at https://www.fisheries.noaa.gov/inport/item/45954.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date May 15, 2025
    Metadata Created Date October 19, 2024
    Metadata Updated Date May 24, 2025
    Reference Date(s) 2021-10 (revision), 2021 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NMFS PIFSC

    Other Data Resources

    Graphic Preview

    Example of a SCUBA diver collecting a water sample underwater using a Niskin Bottle. Source: Galapagos Science Center, El-Nino Research Cruise News Blog, https://galapagosscience.wordpress.com/.

    Additional Metadata

    Resource Type Dataset
    Metadata Date May 15, 2025
    Metadata Created Date October 19, 2024
    Metadata Updated Date May 24, 2025
    Reference Date(s) 2021-10 (revision), 2021 (publication)
    Responsible Party (Point of Contact, Custodian)
    Contact Email
    Guid gov.noaa.nmfs.inport:45817
    Access Constraints Cite As: Pacific Islands Fisheries Science Center, [Date of Access]: Water Chemistry and Shallow Water Conductivity-Temperature-Depth (CTD) Profiles for select locations across Batangas, Philippines from 2012 to 2015 [Data Date Range], https://www.fisheries.noaa.gov/inport/item/45817., Access Constraints: None, Use Constraints: These oceanographic data are PRELIMINARY data and have not been screened for accuracy. NOAA can not be held liable for use of these data in a manner other than for perusal of preliminary oceanographic data for scientific research on coral reefs ecosystems. Please cite PIFSC Ecosystem Sciences Division (ESD) when using the data. Suggested citation: Ecosystem Sciences Division; Pacific Islands Fisheries Science Center (2021). Water chemistry and Conductivity-Temperature-Depth (CTD) profiles at coral reef sites in Batangas, Philippines from discrete surface and bottom water samples collected from 2012 to 2015. NOAA's National Center for Environmental Information, https://www.fisheries.noaa.gov/inport/item/45817., Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
    Bbox East Long 120.8951
    Bbox North Lat 13.7281
    Bbox South Lat 13.6587
    Bbox West Long 120.872
    Coupled Resource
    Frequency Of Update notPlanned
    Graphic Preview Description Example of a SCUBA diver collecting a water sample underwater using a Niskin Bottle. Source: Galapagos Science Center, El-Nino Research Cruise News Blog, https://galapagosscience.wordpress.com/.
    Graphic Preview File https://galapagosscience.files.wordpress.com/2014/12/chuki_niskin.jpg
    Graphic Preview Type JPG
    Harvest Object Id 647005cd-6881-46b1-83f6-dfde463bef6f
    Harvest Source Id c0beac72-5f43-4455-8c33-1b345fbc2dfe
    Harvest Source Title NMFS PIFSC
    Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
    Lineage NOAA's Coral Reef Ecosystem Program (CREP) assembles carbonate chemistry information from discrete seawater samples analyzed for two parameters: 1) Dissolved Inorganic Carbon (DIC), which in some literature is defined as Total Carbon (CT), and 2) Total Alkalinity (TA or AT). To examine carbonate chemistry, discrete seawater samples were taken at fixed climate sites from 2012-2015 in the Philippines. Shallow CTD profiles were also collected from climate survey sites in Batangas, Philippines (Mabini and Tingloy) by the PIFSC Ecosystem Sciences Division in 2015 to measure conductivity, temperature, pressure, depth, salinity, and density. All carbonate system collection and measurement methodologies follow the protocols accepted by the greater scientific community and outlined in Dickson et al. (2007)
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[120.872, 13.6587], [120.8951, 13.6587], [120.8951, 13.7281], [120.872, 13.7281], [120.872, 13.6587]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2015-05-23
    Temporal Extent End 2015-06-03

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