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Reconciling models and measurements of marsh vulnerability to sea level rise
Coleman, D.J.; Schuerch, M.; Temmerman, S.; Guntenspergen, G.; Smith, C.G.; Kirwan, M.L. (2022). Reconciling models and measurements of marsh vulnerability to sea level rise. Limnology and Oceanography Letters 7(2): 140-149. https://dx.doi.org/10.1002/lol2.10230
In: Limnology and Oceanography Letters. John Wiley & Sons: Hoboken. ISSN 2378-2242; e-ISSN 2378-2242
Peer reviewed article  
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  • Coleman, D.J.
  • Schuerch, M.
  • Temmerman, S.
  • Guntenspergen, G.
  • Smith, C.G.
  • Kirwan, M.L.
Abstract
    Tidal marsh survival in the face of sea level rise (SLR) and declining sediment supply often depends on the ability of marshes to build soil vertically. However, numerical models typically predict survival under rates of SLR that far exceed field-based measurements of vertical accretion. Here, we combine novel measurements from seven U.S. Atlantic Coast marshes and data from 70 additional marshes from around the world to illustrate that—over continental scales—70% of variability in marsh accretion rates can be explained by suspended sediment concentratin (SSC) and spring tidal range (TR). Apparent discrepancies between models and measurements can be explained by differing responses in high marshes and low marshes, the latter of which accretes faster for a given SSC and TR. Together these results help bridge the gap between models and measurements, and reinforce the paradigm that sediment supply is the key determinant of wetland vulnerability at continental scales.
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