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|a Florida River Flow Patterns and the Atlantic Mutidecadal Oscillation |h [electronic resource]. |
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|a [S.l.] : |b John Wiley & Sons, Ltd., |c 2008. |
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|a River Research and Applications 24. |
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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 A major step in developing legislatively mandated ecological flows for watercourses in Florida, USA is the selection of an
appropriate baseline flow period. Recently climatologists have established a link between multidecadal periods of warming and
cooling of the Atlantic Ocean (the Atlantic Multidecadal Oscillation (AMO)) and rainfall patterns across much of North
America. During an AMO warm period (pre-1970), much of North America received less than average rainfall, while during a
multidecadal cool period (post-1970), much of North America experienced above normal rainfall. There are exceptions to this
general trend with some areas of North America showing an opposite relationship with the AMO. Peninsular Florida is one of
these exceptions. While analysing flows on a number of rivers in south–central Florida, we observed a step rather than a
monotonic trend in flows consistent with a switch from a warm multidecadal period to a cool multidecadal period.We examined
river flows at all gaging sites throughout Florida and the southeast United States that had flow records of 60 years or more. Three
river flow patterns were clearly discerned: a Southern River Flow Pattern (SRP) where flows are seasonally greatest during the
summer months (June–September); a Northern River Flow Pattern (NRP) where flows are seasonally greatest in the spring and a
Bimodal River Flow Pattern (BRP) with distinct peaks in rainfall and flow both in spring and summer. Those rivers with a BRP
occur in a band that stretches diagonally from the northeast corner of Florida (St. Marys River) and runs in a southwest direction
to the big bend area of the state near the mouth of the Suwannee River. Rivers to the north of this line exhibit the NRP, while
rivers to the south of this line exhibit the SRP. Rivers with the SRP exhibited consistently lower flows during the AMO cool
period and consistently higher flows during the AMO warm period. Differences in flow volumes between multidecadal periods
averaged 30% in SRP rivers. Rivers with a NRP showed an opposite trend. Most convincingly, rivers with the BRP exhibited
both trends, the spring mode responded similarly to the northern rivers while the summer mode followed the southern river trend.
These results have important implications not only for the establishment of ecological flows, but also for water supply planning
and development, flood control and stream ecology in general, since there are considerable differences in the magnitude of flows
that should naturally be expected between multidecadal periods. Relatively large decreases and increases in flow are attributable
to rainfall differences between multidecadal periods. |
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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 dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15052555/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/05/25/55/00001/FI15052555_thm.jpg |
