Coral record of harbour dredging: Townsville, Australia

Graeme Esslemont, Robert Russell, Bill Maher

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    Concentrations of Ba/Ca, Cu/Ca, Sr/Ca and Zn/Ca were measured by secondary ion mass spectrometry in a branching coral, Pocillopora damicornis, from a coral reef receiving suspended sediments from Townsville Harbour dredging activities. The Sr/Ca record correlated with observed sea surface temperatures (SST), which allowed pulse inclusions of barium, copper and zinc to be dated and compared with various environmental records. Copper and zinc concentrations in this coral skeleton correlated with short exposures to labile metals in resuspended fine sediment. The biota–sediment accumulation factor (BSAF) indicated that concentrations of these metals in the coral skeleton were lower than the labile fraction in the sediment (BSAF=0.15 and 0.18, respectively). Distortions to the timing and amplitude of pulse-records in the coral record may have been caused by seasonal variation in skeleton growth. High barium concentrations in the coral skeleton recorded during a dry period corresponded with weather events that resuspended fine, inner-shelf sediment, specifically local winds interacting with swells driven by offshore trade winds, and dredging of the harbour's access channel. This coral has recorded entry of resuspended fine sediment into the reef. Irregularities in the strontium paleothermometer were similar to the solar radiation profile, which preceded variation of seawater temperature by about a month. When coral records were temporally adjusted to fit variation in solar radiation, the correlation between strontium and solar radiation was greater than the strontium–temperature correlation used to date the coral
    Original languageEnglish
    Pages (from-to)51-64
    Number of pages14
    JournalJournal of Marine Systems
    Volume52
    Issue number1
    DOIs
    Publication statusPublished - 2004

    Fingerprint

    coral record
    dredging
    corals
    coral
    harbor
    skeleton
    solar radiation
    barium
    strontium
    sediments
    zinc
    sediment
    copper
    shelf sediment
    trade wind
    metal
    metals
    trade winds
    swell
    suspended sediment

    Cite this

    Esslemont, Graeme ; Russell, Robert ; Maher, Bill. / Coral record of harbour dredging: Townsville, Australia. In: Journal of Marine Systems. 2004 ; Vol. 52, No. 1. pp. 51-64.
    @article{1e2503f398c34b52a2bc7704fddeb725,
    title = "Coral record of harbour dredging: Townsville, Australia",
    abstract = "Concentrations of Ba/Ca, Cu/Ca, Sr/Ca and Zn/Ca were measured by secondary ion mass spectrometry in a branching coral, Pocillopora damicornis, from a coral reef receiving suspended sediments from Townsville Harbour dredging activities. The Sr/Ca record correlated with observed sea surface temperatures (SST), which allowed pulse inclusions of barium, copper and zinc to be dated and compared with various environmental records. Copper and zinc concentrations in this coral skeleton correlated with short exposures to labile metals in resuspended fine sediment. The biota–sediment accumulation factor (BSAF) indicated that concentrations of these metals in the coral skeleton were lower than the labile fraction in the sediment (BSAF=0.15 and 0.18, respectively). Distortions to the timing and amplitude of pulse-records in the coral record may have been caused by seasonal variation in skeleton growth. High barium concentrations in the coral skeleton recorded during a dry period corresponded with weather events that resuspended fine, inner-shelf sediment, specifically local winds interacting with swells driven by offshore trade winds, and dredging of the harbour's access channel. This coral has recorded entry of resuspended fine sediment into the reef. Irregularities in the strontium paleothermometer were similar to the solar radiation profile, which preceded variation of seawater temperature by about a month. When coral records were temporally adjusted to fit variation in solar radiation, the correlation between strontium and solar radiation was greater than the strontium–temperature correlation used to date the coral",
    author = "Graeme Esslemont and Robert Russell and Bill Maher",
    year = "2004",
    doi = "10.1016/j.jmarsys.2004.01.005",
    language = "English",
    volume = "52",
    pages = "51--64",
    journal = "Journal of Marine Systems",
    issn = "0924-7963",
    publisher = "Elsevier",
    number = "1",

    }

    Coral record of harbour dredging: Townsville, Australia. / Esslemont, Graeme; Russell, Robert; Maher, Bill.

    In: Journal of Marine Systems, Vol. 52, No. 1, 2004, p. 51-64.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Coral record of harbour dredging: Townsville, Australia

    AU - Esslemont, Graeme

    AU - Russell, Robert

    AU - Maher, Bill

    PY - 2004

    Y1 - 2004

    N2 - Concentrations of Ba/Ca, Cu/Ca, Sr/Ca and Zn/Ca were measured by secondary ion mass spectrometry in a branching coral, Pocillopora damicornis, from a coral reef receiving suspended sediments from Townsville Harbour dredging activities. The Sr/Ca record correlated with observed sea surface temperatures (SST), which allowed pulse inclusions of barium, copper and zinc to be dated and compared with various environmental records. Copper and zinc concentrations in this coral skeleton correlated with short exposures to labile metals in resuspended fine sediment. The biota–sediment accumulation factor (BSAF) indicated that concentrations of these metals in the coral skeleton were lower than the labile fraction in the sediment (BSAF=0.15 and 0.18, respectively). Distortions to the timing and amplitude of pulse-records in the coral record may have been caused by seasonal variation in skeleton growth. High barium concentrations in the coral skeleton recorded during a dry period corresponded with weather events that resuspended fine, inner-shelf sediment, specifically local winds interacting with swells driven by offshore trade winds, and dredging of the harbour's access channel. This coral has recorded entry of resuspended fine sediment into the reef. Irregularities in the strontium paleothermometer were similar to the solar radiation profile, which preceded variation of seawater temperature by about a month. When coral records were temporally adjusted to fit variation in solar radiation, the correlation between strontium and solar radiation was greater than the strontium–temperature correlation used to date the coral

    AB - Concentrations of Ba/Ca, Cu/Ca, Sr/Ca and Zn/Ca were measured by secondary ion mass spectrometry in a branching coral, Pocillopora damicornis, from a coral reef receiving suspended sediments from Townsville Harbour dredging activities. The Sr/Ca record correlated with observed sea surface temperatures (SST), which allowed pulse inclusions of barium, copper and zinc to be dated and compared with various environmental records. Copper and zinc concentrations in this coral skeleton correlated with short exposures to labile metals in resuspended fine sediment. The biota–sediment accumulation factor (BSAF) indicated that concentrations of these metals in the coral skeleton were lower than the labile fraction in the sediment (BSAF=0.15 and 0.18, respectively). Distortions to the timing and amplitude of pulse-records in the coral record may have been caused by seasonal variation in skeleton growth. High barium concentrations in the coral skeleton recorded during a dry period corresponded with weather events that resuspended fine, inner-shelf sediment, specifically local winds interacting with swells driven by offshore trade winds, and dredging of the harbour's access channel. This coral has recorded entry of resuspended fine sediment into the reef. Irregularities in the strontium paleothermometer were similar to the solar radiation profile, which preceded variation of seawater temperature by about a month. When coral records were temporally adjusted to fit variation in solar radiation, the correlation between strontium and solar radiation was greater than the strontium–temperature correlation used to date the coral

    U2 - 10.1016/j.jmarsys.2004.01.005

    DO - 10.1016/j.jmarsys.2004.01.005

    M3 - Article

    VL - 52

    SP - 51

    EP - 64

    JO - Journal of Marine Systems

    JF - Journal of Marine Systems

    SN - 0924-7963

    IS - 1

    ER -