Waccamaw/Savannah River Wetlands Late Holocene Multiproxy Sediment Data Jones, M.C.; Bernhardt, C.E.; Krauss, K.W.; Noe, G.B. Jones, M.C. Bernhardt, C.E. Krauss, K.W. Noe, G.B. earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Savannah12-12-9-3>LATITUDE 32.24>LONGITUDE -81.15) (Waccamaw11-11-3-1>LATITUDE 33.422823>LONGITUDE -79.207996) (Savannah12-12-10-2>LATITUDE 32.18>LONGITUDE -81.14) (Savannah12-12-11-1>LATITUDE 32.238>LONGITUDE -81.155) (Waccamaw11-11-2-3>LATITUDE 33.34001>LONGITUDE -79.34166) (Waccamaw11-11-1-2>LATITUDE 33.55564>LONGITUDE -79.08943) (Waccamaw11-11-2-1>LATITUDE 33.55564>LONGITUDE -79.08943) (Savannah12-12-10-3>LATITUDE 32.17>LONGITUDE -81.14) This study examines Holocene impacts of changes in climate, land use, and sea level rise (SLR) on sediment accretion, carbon accumulation rates (CAR), and vegetation along a transect of tidal freshwater forested wetlands (TFFW) to oligohaline marsh along the Waccamaw River, South Carolina (four sites) and along the Savannah River, Georgia (four sites). We use pollen, plant macrofossils, accretion, and CAR from cores, spanning the last 1,500-6,000 years to test the hypothesis that TFFW have remained stable throughout the late Holocene and that marshes transitioned from TFFW during elevated SLR during the Medieval Climate Anomaly, with further transformation resulting from colonial land use change. Results show low and stable accretion and CAR through much of the Holocene, despite moderate changes associated with Holocene paleoclimate. In all records, the largest observed change occurred within the last ~400 years, driven by colonial land clearance, shifting terrigenous sediment into riparian wetlands, resulting in order-of-magnitude increases in accretion and C accumulation. The oligohaline marshes transitioned from TFFW ~300-500 years ago, coincident with colonial land clearance. Postcolonial decreases in CAR and accretion occur because of watershed reforestation over the last century. All sites show evidence of recent (decades to century) swamp forest decline due to increasing salinity and tidal inundation from SLR. This study suggests that allochthonous sediment input during colonialization helped maintain TFFW but that current SLR rates are too high for TFFW to persist, although higher accretion rates in oligohaline marshes increase the resilience of tidal wetlands as they transition from TFFW to marsh. STUDY NOTES: Multiproxy (pollen, plant macrofossils, sediment accretion, and carbon accumulation) data from river wetlands sediment cores. Cores are from 2 transects ranging from tidal freshwater forested wetlands (TFFW) to oligohaline marsh, along the Waccamaw and Savannah Rivers (South Carolina and Georgia, USA) for the late Holocene (~6,000 - 1,500 years BP). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Jones, M.C. Investigator : Bernhardt, C.E. Investigator : Krauss, K.W. Investigator : Noe, G.B. 2019-05-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/26690 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/southcarolina/waccamaw2017macropct11-11-2-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/georgia/savannah2017macropct12-12-10-2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/georgia/savannah2017pollen12-12-10-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/southcarolina/waccamaw2017loi11-11-1-2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/southcarolina/waccamaw2017loi11-11-2-1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/southcarolina/waccamaw2017macropct11-11-1-2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/southcarolina/waccamaw2017macro11-11-2-3.txt 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Jones, Christopher E. Bernhardt, Ken W. Krauss, Gregory B. Noe2017The Impact of Late Holocene Land Use Change, Climate Variability, and Sea Level Rise on Carbon Storage in Tidal Freshwater Wetlands on the Southeastern United States Coastal PlainJournal of Geophysical Research: Biogeosciences122123126-314110.1002/2017JG004015https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017JG004015 START YEAR: 5820 cal yr BP * END YEAR: -61 cal yr BP -81.155 32.17 -79.08943 33.55564