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|a Climate variability from the Florida Bay sedimentary record |h [electronic resource] |b possible teleconnections to ENSO, PNA, and CNP. |
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|a [S.l.] : |b Inter-Research, |c 2002. |
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|a Climate Research Volume 19. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a We analyzed decadal and interannual climate variability in South Florida since 1880
using geochemical and faunal paleosalinity indicators from isotopically dated sediment cores at Russell
Bank in Florida Bay (FB). Using the relative abundance of 2 ostracode species and the Mg/Ca
ratios in Loxoconcha matagordensis shells to reconstruct paleosalinity, we found evidence for cyclic
oscillations in the salinity of central FB. During this time salinity fluctuated from as low as ~18 parts
per thousand (ppt) to as high as ~57 ppt. Time series analyses suggest, in addition to a 5.6 yr Mg/Ca
based salinity periodicity, there are 3 other modes of variability in paleosalinity indicators: 6–7, 8–9,
and 13–14 yr periods which occur in all paleo-proxies. To search for factors that might cause salinity
to vary in FB, we compared the Russell Bank paleosalinity record to South Florida winter rainfall, the
Southern Oscillation Index (SOI), winter North Atlantic Oscillation (NAO), and the winter Pacific
North American (PNA) index, and a surrogate for the PNA in the winter season, the Central North
Pacific (CNP) index. SOI and PNA/CNP appear to be associated with South Florida winter precipitation.
Time series analyses of SOI and winter rainfall for the period 1910–1999 suggest ~5, 6–7, 8–9
and 13–14 yr cycles. The 6–7 yr and 13–14 yr cycles correspond to those observed in the faunal and
geochemical time series from Russell Bank. The main periods of the CNP index are 5–6 and 13–15 yr,
which are similar to those observed in FB paleosalinity. Cross-spectral analyses show that winter
rainfall and salinity are coherent at 5.6 yr with a salinity lag of ~1.6 mo. These results suggest that
regional rainfall variability influences FB salinity over interannual and decadal timescales and that
much of this variability may have its origin in climate variability in the Pacific Ocean/atmosphere
system. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a teleconnections (climatology). |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15042695/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/04/26/95/00001/FI15042695_thm.jpg |
