Other skeptic arguments about sea level concern the validity of observations, obtained via tide gauges and more recently satellite altimeter observations.
Tide gauges must take into account changes in the height of land itself caused by local geologic processes, a favorite distraction for skeptics to highlight.
Information on subsidence is available from tide gauge measurements but no measurements have been made of sedimentation rates in marshland developed on Recent Mississippi alluvium.
This study presents an attempt to use radionuclide profiles to date four short sediment cores taken from two Chilean lakes located in a highly active geodynamic setting.
The survival and productivity of Gulf Coast marshes depend on the influx and accumulation of sediment that offsets the effect of subsidence and maintains the marsh surface within the tidal range.
To predict long-range trends in marsh stability, accurate measurements are needed of both subsidence and sedimentation rates.
The upward curve agrees with global temperature trends and with the accelerating melting of ice in Greenland and other places.Enter a term in the search box to find its definition.Use the controls in the far right panel to increase or decrease the number of terms automatically displayed (or to completely turn that feature off). Vertical marsh accretion is the process which counteracts subsidence and eustatic sea-level rise and prevents marsh deterioration, but, as in Louisiana's salt marshes, the pattern, rate and variability are sufficiently complicated to defy simple prediction.Conditions of marsh development vary throughout the coast, from the modern and Atchafalaya deltas through the abandoned deltas to the Chenier Plain.In such settings, sediment series commonly contain earthquake-triggered reworked layers and/or volcanic ash layers.