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    Observations and a model of net calcification declines in Palau's largest coral reef lagoon between 1992 and 2015

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    Article (6.724Mb)
    Date
    2020-07-06
    Author
    Lentz, Steven J.  Concept link
    Cohen, Anne L.  Concept link
    Shamberger, Kathryn E. F.  Concept link
    Barkley, Hannah C.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/26416
    As published
    https://doi.org/10.1029/2020JC016147
    DOI
    10.1029/2020JC016147
    Keyword
     coral reef; calcification; bleaching; residence time; net ecosystem calcification; Palau 
    Abstract
    Net ecosystem calcification (NEC) rates of Palau's largest lagoon and barrier reef system between 1992 and 2015 are estimated from sparse total alkalinity (TA) and salinity measurements and a tidal exchange model in which surface lagoon water transported offshore on the ebb tide is replaced by saltier (denser) ocean water that sinks to the bottom after entering the lagoon on the flood tide. Observed lagoon salinities are accurately reproduced by the model with no adjustable parameters. To accurately reproduce observed lagoon TA, NEC for the lagoon‐barrier reef system was 70 mmols m−2 day−1 from 1992 to 1998, 35 mmols m−2 day−1 from 1999 to 2012, and 25 mmols m−2 day−1 from 2013 to 2015. This indicates that Palau's largest lagoon and barrier reef system has not recovered, as of 2015, from the 50% decline in NEC in 1998 caused by the loss of coral cover following a severe bleaching event. The cause of the further decline in NEC in 2012–2013 is unclear. Lagoon residence times vary from 8 days during spring tides to 14 days during neap tides and drive substantial spring‐neap variations in lagoon TA (~25% of the mean salinity‐normalized ocean‐lagoon TA difference). Sparse measurements that do not resolve these spring‐neap variations can exhibit apparent long‐term variations in alkalinity that are not due to changes in NEC.
    Description
    Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 125(8), (2020): e2020JC016147, doi:10.1029/2020JC016147.
    Collections
    • Geology and Geophysics (G&G)
    • Physical Oceanography (PO)
    Suggested Citation
    Lentz, S. J., Cohen, A. L., Shamberger, K. E. F., & Barkley, H. (2020). Observations and a model of net calcification declines in Palau's largest coral reef lagoon between 1992 and 2015. Journal of Geophysical Research: Oceans, 125(8), e2020JC016147.
     

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