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1 - State of Salt Marshes

Published online by Cambridge University Press:  19 June 2021

Duncan M. FitzGerald
Affiliation:
Boston University
Zoe J. Hughes
Affiliation:
Boston University
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Summary

Salt marshes are expected to undergo substantial change or, potentially, disappear in the next couple of centuries as a result of rising sea level. Increasingly, scientists are asking the question: how long can they survive? This book draws on global expertise to look at how salt marshes evolved, how they function, and how they are responding to the stresses caused by social and environmental change. These environments occur throughout the world: behind barrier islands, bordering estuaries, and dominating lower delta plains (Fig. 1.1) in warm to cool latitudes (≥ 30° latitude). Up until now, previous loss and degradation of coastal marshes has been related to a variety of human actions including dredging and filling, reduction in sediment supplies, and hydrocarbon withdrawal, as well as other causes. However, in the future the greatest impact to marshes will be a consequence of climate change, especially sea-level rise (SLR). Most of the present marshes formed under very different sedimentation and SLR regimes compared to those that occur today. During their formation and throughout their evolution, the rate of SLR was relatively slow and steady, between 0.2 and 1.6 mm/year (Table 1.1). The sustainability of marshes is now threatened by an acceleration in SLR to rates many times greater than those under which they initiated and have evolved. For example, the Romney marsh, which is located north of Boston, Massachusetts, contains a 2-m-thick peat that began forming 3.1 ka BP when sea level was rising at about 0.8 mm/year, a rate that slowed to 0.52 mm/year around 1 ka BP (Donnelly 2006). The rate of SLR in Boston Harbor is now 2.85 mm/year (NOAA 2019), which far exceeds the rate occurring when the Romney marsh built to a supratidal elevation. Eventually, SLR, along with marsh-edge erosion, will outpace the ability of most marshes to accrete vertically (Crosby et al. 2016) and/or compensate for marsh loss by expanding into uplands (Kirwan et al. 2016, Farron 2018).

Type
Chapter
Information
Salt Marshes
Function, Dynamics, and Stresses
, pp. 1 - 6
Publisher: Cambridge University Press
Print publication year: 2021

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References

Barlow, N. L. M., Long, A. J., Saher, M. H., Gehrels, W. R., Garnett, M. H., and Scaife, R. G. 2014. Salt-marsh reconstructions of relative sea-level change in the North Atlantic during the last 2000 years. Quaternary Science Reviews. 99:116.CrossRefGoogle Scholar
Belknap, D. F., and Kraft, J. C. 1977. Holocene relative sea-level changes and coastal stratigraphic units on the northwest flank of the Baltimore Canyon trough geosyncline. Journal of Sedimentary Research. 47:610629.Google Scholar
Crosby, S. C., Sax, D. F., Palmer, M. E., Booth, H. S., Deegan, L. A., Bertness, M. D., and Leslie, H. M. 2016. Salt marsh persistence is threatened by predicted sea-level rise. Estuarine and Coastal Shelf Science, 181:9399.CrossRefGoogle Scholar
Donnelly, J. P. 2006. A revised late Holocene sea-level record for Northern Massachusetts, USA. Joural of Coastal Research, 22:10511061.CrossRefGoogle Scholar
Engelhart, S. E., Horton, B. P., Douglas, B. C., Peltier, W. R., and Törnqvist, T. E. 2009. Spatial variability of late Holocene and 20th century sea-level rise along the Atlantic coast of the United States. Geology, 37:11151118.CrossRefGoogle Scholar
Farron, S. 2018. Morphodynamic responses of salt marshes to sea-level rise: upland expansion, drainage evolution, and biological feedbacks. PhD thesis, Boston Univ., Boston, MA.Google Scholar
FitzGerald, D. M. and Hughes, Z. 2019. Marsh processes and their response to climate change and sea-level rise. Annual Review of Earth and Planetary Sciences, 47:481517.CrossRefGoogle Scholar
Gehrels, W. R. 1996. Integrated high-precision analyses of Holocene relative sea-level changes: Lessons from the coast of Maine. Geological Society of America, Bulletin, 108:10731088.2.3.CO;2>CrossRefGoogle Scholar
Gehrels, W. R. 2000. Using foraminiferal transfer functions to produce high-resolution sea-level records from saltmarsh deposits, Maine, USA. The Holocene 10:367376.CrossRefGoogle Scholar
Gehrels, W. R., Kirby, J. R., Prokoph, A., Newnham, R. M., Achterberg, E. P., Evans, H., Black, S., and Scott, D. B. 2005. Onset of recent rapid sea-level rise in the western Atlantic Ocean. Quaternary Science Reviews. 24:20832100.CrossRefGoogle Scholar
Gehrels, W. R., Marshall, W. A., Gehrels, M. J., Larsen, G., Kirby, J. R., Eiriksson, J., Heinemeier, J., and Shimmield, T. 2006a. Rapid sea-level rise in the North Atlantic Ocean since the first half of the 19th century. Holocene, 16:948964.CrossRefGoogle Scholar
Gehrels, W. R. Szkornik, K., Bartholdy, J., Kirby, J. R., Bradley, S. L., Marshall, W. A., Heinemeier, J., and Pedersen, J. B. T. 2006b. Late Holocene sea-level changes and isostasy in western Denmark. Quaternary Research, 66:288302CrossRefGoogle Scholar
Gehrels, W. R. Hayward, B. W., Newnham, R. M., and Southall, K. E. 2008. A 20th century sea-level acceleration in New Zealand. Geophysical Research Letters 35: L02717.CrossRefGoogle Scholar
Hopkinson, C. S., Morris, J. T., Fagherazzi, S., Wollheim, W. M., and Raymond, P. A. 2018. Lateral marsh edge erosion as a source of sediments for vertical marsh accretion. Journal of Geophysical Research, Biogeosciences, 123:24442465.CrossRefGoogle Scholar
Horton, B. P., Peltier, W. R., Culver, S. J., Drummond, R., Engelhart, S. E., Kemp, A. C, Mallinson, D, et al. 2009. Holocene sea-level changes along the North Carolina Coastline and their implications for glacial isostatic adjustment models. Quaternary Science Reviews, 28:17251736.CrossRefGoogle Scholar
Kirwan, M. L., and Temmerman, S. 2009. Coastal marsh response to historical and future sea-level acceleration. Quaternary Science Reviews, 28:18011808.CrossRefGoogle Scholar
Kirwan, M. L., Walters, D., Reay, W., Carr, J. 2016. Sea level driven marsh expansion in a coupled model of marsh erosion and migration. Geophysical Research Letters, 43: 43664373.CrossRefGoogle Scholar
Langley, J. A., McKee, K. L., Cahoon, D. R., Cherry, J. A., and Megonigal, J. P. 2009. Elevated CO2 stimulates marsh elevation gain, counterbalancing sea-level rise. Proceedings of the National Academy of Sciences, 106:61826186.CrossRefGoogle ScholarPubMed
Lee, Y. G.; Choi, J. M., and Oertel, G. F. 2008. Postglacial sea-level change of the Korean southern sea shelf. Journal of Coastal Research, 24:118132.CrossRefGoogle Scholar
Möller, I., Kudella, M., Franziska, R., Spencer, T., Paul, M., Van Wesenbeeck, B. K., Wolters, G., et al. 2014. Wave attenuation over coastal salt marshes under storm surge conditions. Nature Geoscience, 7:727731.CrossRefGoogle Scholar
Morris, J. T., Sundareshwar, P. V., Nietch, C. T., Kjerfve, B., and Cahoon, D. R. 2002. Responses of coastal wetlands to rising sea level. Journal of Ecology, 83:28692877.CrossRefGoogle Scholar
Mudd, S. M., Howell, S. M., Morris, J. T. 2009. Impact of dynamic feedbacks between sedimentation, sea-level rise, and biomass production on near-surface marsh stratigraphy and carbon accumulation. Estuarine, Coastal and Shelf Science, 82:377389.CrossRefGoogle Scholar
Nikitina, D. L, Pizzuto, J. E., Schwimmer, R. A., Ramsey, K. W. 2000. An updated Holocene sea-level curve for the Delaware coast. Marine Geology, 171:720.CrossRefGoogle Scholar
Pardi, R. R., Tomecek, L., and Newman, W. S. 1984. Queens College radiocarbon measurements IV. Radiocarbon, 26:412430.CrossRefGoogle Scholar
Ratliff, K. M., Braswell, A. E., and Marani, M. 2015. Spatial response of coastal marshes to increased atmospheric CO2. Proceedings of the National Academy of Sciences, 112:1558015584.CrossRefGoogle ScholarPubMed
Reef, R., Schuerch, M., Christie, E. K., Möller, I., and Spencer, T. 2018. The effect of vegetation height and biomass on the sediment budget of a European saltmarsh. Estuarine, Coastal and Shelf Science, 202:125133.CrossRefGoogle Scholar
Stéphan, P., Goslin, J., Pailler, Y., Manceau, R., Suanez, S., Van Vliet-Lanoë, B., Hénaff, A., and Delacourt, C. 2015. Holocene salt-marsh sedimentary infilling and relative sea-level changes in West Brittany (France) using foraminifera-based transfer functions. Boreas, 44:153177.CrossRefGoogle Scholar
Syvitski, J. P. M., Vörösmarty, C. J., Kettner, A. J., and Green, P. 2005. Impact of humans on the flux of terrestrial sediment to the global coastal ocean. Science, 308:376380.CrossRefGoogle ScholarPubMed
Weston, N. 2014. Declining sediments and rising seas: an unfortunate convergence for tidal wetlands. Journal of Estuaries and Coasts, 37:123.CrossRefGoogle Scholar

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