Dissolved inorganic carbon, total alkalinity, nitrate, phosphate, temperature and other variables collected from time series observations at Heron Island Reef Flat from 2010-06-01 to 2010-12-13 (NODC Accession 0127256)

Metadata Updated: March 10, 2021

This archival package contains carbonate chemistry and environmental parameters data that were collected from a 200-day time series monitoring on the Heron Island reef flat near the Great Barrier Reef. Understanding the temporal dynamics of present thermal and pH exposure on coral reefs is crucial for elucidating reef response to future global change. Diel ranges in temperature and carbonate chemistry parameters coupled with seasonal changes in the mean conditions define periods during the year when a reef habitat is exposed to anomalous thermal and/or pH exposure. In this study we define anomalous conditions as pH and temperature values that exceed a threshold that we have operationally defined for each variable. We present a 200-day time series from June through December 2010 of carbonate chemistry and environmental parameters measured on the Heron Island reef flat. These data reveal that aragonite saturation state, pH, and pCO2 were primarily modulated by biologically-driven, changes in dissolved organic carbon (DIC) and total alkalinity (TA), rather than salinity and temperature. The largest diel temperature ranges occurred in austral spring, in October (1.5 - 6.6 degrees Celsius) and lowest diel ranges (0.9 - 3.2 degrees Celsius) were observed in July, at the peak of winter. We observed large diel total pH variability, with a maximum range of 7.7 - 8.5 total pH units, with minimum diel average pH values occurring during spring and maximum during fall. As with many other reefs, the nighttime pH minima on the reef flat were far lower than pH values predicted for the open ocean by 2100. DIC and TA both increased from June (end of Fall) to December (end of Spring). Using this high-resolution dataset, we developed exposure metrics of pH and temperature individually for intensity, duration, and severity of low pH and high temperature events, as well as a combined metric. Periods of anomalous temperature and pH exposure were asynchronous on the Heron Island reef flat, which underlines the importance of understanding the dynamics of co-occurrence of multiple stressors on coastal ecosystems.

Access & Use Information

Public: This dataset is intended for public access and use. 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.

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Dates

Metadata Created Date March 10, 2021
Metadata Updated Date March 10, 2021
Data Update Frequency irregular

Metadata Source

Harvested from Commerce Non Spatial Data.json Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date March 10, 2021
Metadata Updated Date March 10, 2021
Publisher DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
Unique Identifier Unknown
Maintainer
Identifier gov.noaa.nodc:0127256
Language en-US
Data Last Modified 2015-04-08
Public Access Level public
Data Update Frequency irregular
Bureau Code 006:48
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Old Spatial {"type": "Point", "coordinates": 151.92, -23.45}
Program Code 006:059
Source Datajson Identifier True
Source Hash f57e14d84ed4e1738bcc124f4aa603c2106464fd
Source Schema Version 1.1
Spatial {"type": "Point", "coordinates": 151.92, -23.45}
Temporal 2010-06-01T00:00:00/2010-12-13T00:00:00

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