Seasonally Resolved Surface Water (delta)14C Variability in the Lombok Strait: A Coralline Perspective

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We have explored surface water mixing in the Lombok Strait through a {approx}bimonthly resolved surface water {Delta}{sup 14}C time-series reconstructed from a coral in the Lombok Strait that spans 1937 through 1990. The prebomb surface water {Delta}{sup 14}C average is -60.5{per_thousand} and individual samples range from -72{per_thousand} to 134{per_thousand}. The annual average post-bomb maximum occurs in 1973 and is 122{per_thousand}. The timing of the post-bomb maximum is consistent with a primary subtropical source for the surface waters in the Indonesian Seas. During the post-bomb period the coral records regular seasonal cycles of 5-20{per_thousand}. Seasonal high {Delta}{sup 14}C occur during March-May ... continued below

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Guilderson, T P; Fallon, S J; Moore, M D; Schrag, D P & Charles, C D April 23, 2008.

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We have explored surface water mixing in the Lombok Strait through a {approx}bimonthly resolved surface water {Delta}{sup 14}C time-series reconstructed from a coral in the Lombok Strait that spans 1937 through 1990. The prebomb surface water {Delta}{sup 14}C average is -60.5{per_thousand} and individual samples range from -72{per_thousand} to 134{per_thousand}. The annual average post-bomb maximum occurs in 1973 and is 122{per_thousand}. The timing of the post-bomb maximum is consistent with a primary subtropical source for the surface waters in the Indonesian Seas. During the post-bomb period the coral records regular seasonal cycles of 5-20{per_thousand}. Seasonal high {Delta}{sup 14}C occur during March-May (warm, low salinity), and low {Delta}{sup 14}C occur in September (cool, higher salinity). The {Delta}{sup 14}C seasonality is coherent and in phase with the seasonal {Delta}{sup 14}C cycle observed in Makassar Strait. We estimate the influence of high {Delta}{sup 14}C Makassar Strait (North Pacific) water flowing through the Lombok Strait using a two endmember mixing model and the seasonal extremes observed at the two sites. The percentage of Makassar Strait water varies between 16 and 70%, and between 1955 and 1990 it averages 40%. During La Nina events there is a higher percentage of Makassar Strait (high {Delta}{sup 14}C) water in the Lombok Strait.

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PDF-file: 36 pages; size: 0.4 Mbytes

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  • Journal Name: Journal of Geophysical Research (Oceans), vol. 114, C7, July 31, 2009, doi:10.1029/2008JC004876; Journal Volume: 114; Journal Issue: C7

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  • Report No.: LLNL-JRNL-403333
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 972404
  • Archival Resource Key: ark:/67531/metadc929786

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  • April 23, 2008

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 1, 2016, 7:15 p.m.

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Guilderson, T P; Fallon, S J; Moore, M D; Schrag, D P & Charles, C D. Seasonally Resolved Surface Water (delta)14C Variability in the Lombok Strait: A Coralline Perspective, article, April 23, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc929786/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.