These files contain data collected from Caerlaverock saltmarsh in Scotland, UK. CO2_flux.zip: This file contains sediment to atmosphere CO2 flux data at eroding and prograding salt marsh sites. Groundwater.zip: This file contains groundwater level measurements at eroding and prograding salt marsh sites. Soil_analysis.zip: This file contains soil core analyses, e.g. Bulk density, LOI, grain size, carbon content, and carbon stable isotope analysis at eroding and prograding salt marsh sites. Soil_temperature.zip: This file contains soil temperature measurements at eroding and prograding salt marsh sites.