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High-resolution Sr/Ca records in sclerosponges calibrated to temperature in situ
Rosenheim, B.E.; Swart, P.K.; Thorrold, S.R.; Willenz, P.; Berry, L.; Latkoczy, C. (2004). High-resolution Sr/Ca records in sclerosponges calibrated to temperature in situ. Geology (Boulder Colo.) 32(2): 145-148. dx.doi.org/10.1130/G20117.1
In: Geology. Geological Society of America: Boulder. ISSN 0091-7613; e-ISSN 1943-2682, meer
Peer reviewed article  

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Trefwoorden
    Ceratoporella nicholsoni (Hickson, 1911) [WoRMS]
    Marien
Author keywords
    paleoceanography; sclerosponge; Ceratoporella nicholsoni; Sr; Ca ratios; ocean temperature; calibration

Project Top | Auteurs 
  • Validation of alternative marine calcareous skeletons as recorders of global climate change

Auteurs  Top 
  • Rosenheim, B.E.
  • Swart, P.K.
  • Thorrold, S.R.
  • Willenz, P.
  • Berry, L.
  • Latkoczy, C.

Abstract
    Ratios of strontium to calcium have been analyzed by laser-ablation inductively coupled plasma–mass spectrometry (LA-ICP-MS) in a skeletal section of the sclerosponge Ceratoporella nicholsoni. The growth period, representative of 3 yr, was stained in the skeleton with a fluorochrome (calcein). Temperatures were recorded at 2 h intervals within the shallow, cryptic reef enclosure that the sclerosponge inhabited on the northern coast of Jamaica, allowing the formulation of a direct empirical relationship between Sr/Ca and temperature. To verify this calibration, Sr/Ca ratios of two sclerosponges of the same species from depths of 67 m and 136 m in Exuma Sound, Bahamas, were analyzed by LA-ICP-MS and compared to the temperatures from these depths over a decade prior to collection. The result is an independently verified, high-resolution empirical calibration for the temperature sensitivity of Sr/Ca ratios in the aragonite skeletons of sclerosponges from Jamaica and the Bahamas. The calibration is a first for C. nicholsoni and indicates that sclerosponges are more sensitive temperature recorders than zooxanthellate corals. It represents an important step in establishing skeletal geochemistry of sclerosponges as a proxy of temperature in the upper 250 m of the ocean.

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