title: Vulnerability of Louisiana's coastal wetlands to present-day rates of relative sea-level rise.
abstract: Coastal Louisiana has lost about 5,000 km2of wetlands over the past century and concern exists whether remaining wetlands will persist while facing some of the world's highest rates of relative sea-level rise (RSLR). Here we analyse an unprecedented data set derived from 274 rod surface-elevation table-marker horizon stations, to determine present-day surface-elevation change, vertical accretion and shallow subsidence rates. Comparison of vertical accretion rates with RSLR rates at the land surface (present-day RSLR rates are 12±8 mm per year) shows that 65% of wetlands in the Mississippi Delta (SE Louisiana) may keep pace with RSLR, whereas 58% of the sites in the Chenier Plain (SW Louisiana) do not, rendering much of this area highly vulnerable to RLSR. At least 60% of the total subsidence rate occurs within the uppermost 5-10 m, which may account for the higher vulnerability of coastal Louisiana wetlands compared to their counterparts elsewhere.
authors.affiliation: Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA.
authors.forename: Krista L
authors.initials: KL
authors.lastname: Jankowski
authors.affiliation: Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA.
authors.forename: Torbjörn E
authors.initials: TE
authors.lastname: Törnqvist
authors.affiliation: Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA.
authors.forename: Anjali M
authors.identifier: 0000-0003-2485-3449
authors.initials: AM
authors.lastname: Fernandes