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|a The dynamic response of reef islands to sea level rise: evidence from multi-decadal analysis of island change in the central pacific |h [electronic resource]. |
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|a Global and Planetary Change. |
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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 Low-lying atoll islands are widely perceived to erode in response to measured and future sea
level rise. Using historical aerial photography and satellite images this study presents the first
quantitative analysis of physical changes in 27 atoll islands in the central Pacific over a 19 to
61 year period. This period of analysis corresponds with instrumental records that show a rate
of sea level rise of 2.0 mm.y-1 in the Pacific. Results show that 86% of islands remained stable
(43%) or increased in area (43%) over the timeframe of analysis. Largest decadal rates of
increase in island area range between 0.1 to 5.6 hectares. Only 14% of study islands exhibited
a net reduction in island area. Despite small net changes in area, islands exhibited larger gross
changes. This was expressed as changes in the planform configuration and position of islands
on reef platforms. Modes of island change included: ocean shoreline displacement toward the
lagoon; lagoon shoreline progradation; and, extension of the ends of elongate islands.
Collectively these adjustments represent net lagoonward migration of islands in 65% of cases.
Results contradict existing paradigms of island response and have significant implications for
the consideration of island stability under ongoing sea level rise in the central Pacific. First,
islands are geomorphologically persistent features on atoll reef platforms and can increase in
island area despite sea level change. Second; islands are dynamic landforms that undergo a
range of physical adjustments in responses to changing boundary conditions, of which sea
level is just one factor. Third, erosion of island shorelines must be reconsidered in the context
of physical adjustments of the entire island shoreline as erosion may be balanced by
progradation on other sectors of shorelines. Results indicate that the style and magnitude of
geomorphic change will vary between islands. Therefore, Island nations must place a high
priority on resolving the precise styles and rates of change that will occur over the next
century and reconsider the implications for adaption. |
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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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|t The dynamic response of reef islands to sea level rise: evidence from multi-decadal analysis of island change in the central pacific |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15060921/00001 |y Click here for full text |
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|3 Host material |u http://www.sciencedirect.com/science/article/pii/S0921818110001013 |y The dynamic response of reef islands to sea level rise: evidence from multi-decadal analysis of island change in the central pacific |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/09/21/00001/Webb_Kench_2010_The dynamic response of reef islands to sea-level risethm.jpg |