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Avoiding timescale bias in assessments of coastal wetland vertical change

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doi: 10.1002/lno.10783
Authors:Breithaupt, Joshua L.; Smoak, Joseph M.; Byrne, Robert H.; Waters, Matthew N.; Moyer, Ryan P.; Sanders, Christian J.
Author Affiliations:Primary:
University of South Florida, College of Marine Science, St. Petersburg, FL, United States
Auburn University, United States
Florida Fish & Wildlife Conservation Commission, United States
Southern Cross University, Australia
Volume Title:Limnology and Oceanography
Source:Limnology and Oceanography, 63(S1), p.S477-S495. Publisher: American Society of Limnology and Oceanography, Ann Arbor, MI, United States. ISSN: 0024-3590
Publication Date:2018
Note:In English. 98 refs.; illus., incl. 4 tables, sketch map
Summary:There is concern that accelerating sea-level rise will exceed the vertical growth capacity of coastal-wetland substrates in many regions by the end of this century. Vertical vulnerability estimates rely on measurements of accretion and/or surface-elevation-change derived from soil cores and/or surface elevation tables (SETs). To date there has not been a broad examination of whether the multiple timescales represented by the processes of accretion and elevation change are equally well-suited for quantifying the trajectories of wetland vertical change in coming decades and centuries. To examine the potential for timescale bias in assessments of vertical change, we compared rates of accretion and surface elevation change using data derived from a review of the literature. In the first approach, average rates of elevation change were compared with timescale-averaged accretion rates from six regions around the world where sub-decadal, decadal, centennial, and millennial timescales were represented. Second, to isolate spatial variability, temporal comparisons were made for regionally unique environmental categories within each region. Last, comparisons were made of records from sites where SET-MH stations and radiometric measurements were co-located in close proximity. We find that rates vary significantly as a function of measurement timescale and that the pattern and magnitude of variation between timescales are location-specific. Failure to identify and account for temporal variability in rates will produce biased assessments of the vertical change capacity of coastal wetlands. Robust vulnerability assessments should combine accretion rates from multiple timescales with the longest available SET record to provide long-term context for ongoing monitoring observations and projections. Abstract Copyright (2018), The Authors Limnology and Oceanography published by Wiley Periodicals, Inc. on behalf of Association for the Sciences of Limnology and Oceanography.
Subjects:Actinides; Alkali metals; C-14; Carbon; Cesium; Coastal environment; Cores; Cs-137; Elevation; Geologic hazards; Isotope ratios; Isotopes; Lead; Measurement; Metals; Natural hazards; Pb-210; Plutonium; Processes; Pu-240/Pu-239; Quantitative analysis; Radioactive isotopes; Review; Sea-level changes; Soils; Spatial variations; Time factor; Wetlands; Australasia; Australia; Bouches-du-Rhone France; Cameron Parish Louisiana; Connecticut; Europe; France; Gulf Coastal Plain; Iberian Peninsula; Italy; Long Island; Louisiana; New South Wales Australia; New York; North America; Queensland Australia; Rhone Delta; Southern Europe; Spain; Staten Island; United States; Veneto Italy; Venice Italy; Venice Lagoon; Victoria Australia; Western Europe; Delta National Wildlife Refuge; Ebro Delta; Everglades National Park; Northeastern Australia; Northeastern Spain; Southeastern Australia
Coordinates:N291500 N300000 W0900000 W0911500
N451300 N453500 E0124000 E0120700
N250000 N260000 W0805000 W0815000
N403000 N412500 W0714500 W0741000
Record ID:818907-33
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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