{ "tag": 18048, "title": "Lifespan of marsh units in Assateague Island National Seashore and Chincoteague Bay, Maryland and Virginia", "pubdate": "20220526", "sername": null, "series_name": null, "issue": "DOI:10.5066\/P9WSYCAN", "publish": null, "publisher_name": null, "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/whcmsc\/SB_data_release\/DR_P9WSYCAN\/mu_lifespan_ASISp.faq.html", "format": null, "email": null, "descript": "The sediment-based lifespan of salt marsh units in Assateague Island National Seashore (ASIS) and Chincoteague Bay is shown for conceptual marsh units defined by Defne and Ganju (2018). The lifespan represents the timescale by which the current sediment mass within a marsh parcel can no longer compensate for sediment export and deficits induced by sea-level rise. The lifespan calculation is based on vegetated cover, marsh elevation, sediment supply, and sea-level rise (SLR) predictions after Ganju and others (2020). Sea level rise scenarios are present day estimates corresponding to the 0.3, 0.5, and 1.0 meter increase in Global Mean Sea Level (GMSL) by 2100 from Sweet and others (2017). Through scientific efforts initiated with the Hurricane Sandy Science Plan, the U.S. Geological Survey has been expanding national assessment of coastal change hazards and forecast products to coastal wetlands, including the Assateague Island National Seashore and Chincoteague Bay salt marshes, with the intent of providing Federal, State, and local managers with tools to estimate the vulnerability and ecosystem service potential of these wetlands. For this purpose, the response and resilience of coastal wetlands to physical factors need to be assessed in terms of the ensuing change to their vulnerability and ecosystem services. References: Defne, Z., and Ganju, N.K., 2018, Conceptual marsh units for Assateague Island National Seashore and Chincoteague Bay, Maryland and Virginia: U.S. Geological Survey data release, https:\/\/doi.org\/10.5066\/P92ZW4D9. Ganju, N.K., Defne, Z., Fagherazzi, S., 2020, Are elevation and open-water conversion of salt marshes connected?, Geophysical Research Letters, https:\/\/doi.org\/10.1029\/2019GL086703. Sweet, W.V., Kopp, R.E., Weaver, C.P., Obeysekera, J., Horton, R.M., Thieler, E.R., and Zervas, C., 2017, Global and regional sea level rise scenarios for the United States (Tech. Rep. NOS CO-OPS 083). Silver Spring, MD: National Oceanic and Atmospheric Administration. https:\/\/doi.org\/10.7289\/v5\/tr-nos-coops-083.", "lang": null, "journal": null, "pwid": null, "originator": [ { "name": "Defne, Zafer", "role": "Author" }, { "name": "Ganju, Neil K.", "role": "Author" } ], "index_term": [ { "thcode": 2, "code": "174", "name": "coastal ecosystems", "scope": "Biological communities and habitats within the narrow zones of land between the margin of oceans or seas and large landmasses." }, { "thcode": 2, "code": "1799", "name": "coastal processes", "scope": "Processes unique to coastal areas including longshore transport, beach erosion, storm surge, shoreline change, delta formation, barrier island migration, beach stabilization by vegetation" }, { "thcode": 2, "code": "1800", "name": "estuarine processes", "scope": "Processes affecting estuaries including tides, waves, mixing of fluvial and marine waters" }, { "thcode": 2, "code": "474", "name": "geospatial datasets", "scope": "Collections of related digital information that are geographically referenced." }, { "thcode": 2, "code": "1028", "name": "sea-level change", "scope": "Variation in the relative vertical position of land and ocean waters. Caused globally by changes in the distribution of ice masses and the shape of the oceans, and locally by the rate of uplift or subsidence of the land surface. Includes both global (eustatic) and local (relative) sea-level variations." }, { "thcode": 2, "code": "1034", "name": "sediment transport", "scope": "Transport of solid particles of unconsolidated rock and mineral fragments, chemical precipitates, or biological materials." }, { "thcode": 2, "code": "1326", "name": "wetland ecosystems", "scope": "Ecosystems whose soil is saturated for long periods seasonally or continuously, including marshes, swamps, and ephemeral ponds. More detailed terms for wetlands can be selected from the FGDC Wetland Classification ." }, { "thcode": 2, "code": "1327", "name": "wetland functions", "scope": "Processes related to wetlands such as support of ecosystems, evaporation effects on weather, nutrient cycles, etc." }, { "thcode": 15, "code": "006", "name": "elevation", "scope": "Height above or below sea level, for example altitude, bathymetry, digital elevation models, slope, derived products, DEMs, TINs" }, { "thcode": 15, "code": "007", "name": "environment", "scope": "Environmental resources, protection and conservation, for example environmental pollution, waste storage and treatment, environmental impact assessment, monitoring environmental risk, nature reserves, landscape, water quality, air quality, environmental modeling" }, { "thcode": 15, "code": "012", "name": "inlandWaters", "scope": "Inland water features, drainage systems and characteristics, for example rivers and glaciers, salt lakes, water utilization plans, dams, currents, floods and flood hazards, water quality, hydrographic charts, watersheds, wetlands, hydrography" }, { "thcode": 15, "code": "014", "name": "oceans", "scope": "Features and characteristics of salt water bodies (excluding inland waters), for example tides, tidal waves, coastal information, reefs, maritime, outer continental shelf submerged lands, shoreline" } ], "place_term": [], "image": [ { "name": "https:\/\/www.sciencebase.gov\/catalog\/file\/get\/6267eb10d34e76103ccf4d98?name=mu_lifespan_ASISp.png", "description": "Graphic of lifespan estimates under background relative sea level rise in Assateague Island and Chincoteague Bay salt marsh overlaying Esri basemap." } ], "fan": [] }