Davis Pond, Massachusetts 16KYr LOI Data and Moisture Balance Reconstructions Newby, P.E.; Shuman, B.N.; Donnelly, J.P.; MacDonald, D. Newby, P.E. Shuman, B.N. Donnelly, J.P. MacDonald, D. Other Hydroclimate Reconstruction hydrology earth science/paleoclimate/climate reconstructions|lake levels|paleolimnology (notes,null,null,null,null,climate reconstructions|lake levels|paleolimnology,null,null,C,null) earth science/paleoclimate/climate reconstructions|lake levels|paleolimnology (age,null,null,calendar year before present,null,climate reconstructions|lake levels|paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation minus evaporation,null,percentile,millimeter,null,climate reconstructions|paleolimnology,null,null,N,75th percentile; based on sediment loss on ignition) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation minus evaporation,null,percentile,millimeter,null,climate reconstructions|paleolimnology,null,null,N,25th percentile; based on sediment loss on ignition) earth science/paleoclimate/climate reconstructions|lake levels|paleolimnology (lake level,null,range lower bound,meter,null,climate reconstructions|lake levels|paleolimnology,null,null,N,relative to present) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,calendar year before present,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation minus evaporation,null,one standard deviation lower bound,millimeter,null,climate reconstructions|paleolimnology,null,null,N,based on sediment loss on ignition) earth science/paleoclimate/climate reconstructions|lake levels|paleolimnology (lake level,null,null,meter,null,climate reconstructions|lake levels|paleolimnology,null,null,N,relative to present) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation minus evaporation,null,null,millimeter,null,climate reconstructions|paleolimnology,null,null,N,based on sediment loss on ignition) earth science/paleoclimate/climate reconstructions|lake levels|paleolimnology (lake level,null,range upper bound,meter,null,climate reconstructions|lake levels|paleolimnology,null,null,N,relative to present) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,550 degrees C) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Davis Pond>LATITUDE 42.1355>LONGITUDE -73.4077) Long-term sediment and ground-penetrating radar data from Davis Pond, a small lake near the Hudson River valley, reveal past droughts in a historically humid region that presently supplies water to millions of people in and around New York City. A minimum of eleven sandy paleoshoreline deposits in the lake date from 13.4 to 0.6 cal ka BP. The deposits span 1500 to 200 yr between bracketing radiocarbon ages, and intrude into lacustrine silts up to 9.0 m below the modern lake surface in a transect of six sediment cores. Three low stands, ca. 13.4-10.9, 9.2 and 8.2 cal ka BP indicate low regional moisture balance when low temperatures affected the North Atlantic region. Consistent with insolation trends, water levels rose from ca. 8.0 cal ka BP to present, but five low stands interrupted the rise and are likely associated with ocean-atmosphere interactions. Similar to evidence from other studies, the data from Davis Pond indicate repeated multi-century periods of prolonged or frequent droughts super-imposed on long-term regional trends toward high water levels. The patterns indicate that water supplies in this heavily populated region have continuously varied at multiple time scales and confirm that humid regions such as the northeastern United States are more prone to severe drought than historically expected. STUDY NOTES: Sediment loss-on-ignition (LOI) values and moisture balance (lake-level and Precipitation minus Evaporation) reconstructions for Davis Pond, Massachusetts. Also included are facies thresholds for differentiating littoral and sub-littoral lake sediment facies based on the raw core data, for use in the iterative lake-level reconstruction process. The reconstruction process iteratively applies each set of thresholds in R to produce an ensemble of reconstructions. The code for generating the lake-level reconstruction according to the process described in Pribyl and Shuman (2014) is provided. Also included are the ensemble mean lake-level reconstruction and its uncertainty per 50-yr interval for the length of the record, and the individual ensemble members for each time step (but without the ages for the steps). R script MoistureBalance is the code for the simple moisture-budget calculation based on the lake-level reconstruction. Again this follows Pribyl and Shuman (2014). PErecon contains the median P-E reconstruction as an anomaly from modern for each 50-yr interval, as well as the 1-sigma and 25% and 75% quantiles of the reconstruction uncertainty. Data and R code are included in original contributor files: Davis_cores.csv, Davis_Iterations_012414.csv, Davis_LLrecon_012414.csv, Davis_PErecon_012414.csv, Davis_R_Script_LLRecon_012414.txt, Davis_R_Script_MoistureBalance_011414.txt, and FaciesThresholds_Davis.csv, plus WDC Paleo formatted text files davis2013loi.txt, davis2013ll.txt, and davis2013p-e.txt. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Newby, P.E. Investigator : Shuman, B.N. Investigator : Donnelly, J.P. Investigator : MacDonald, D. 2014-01-24 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/16094 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011ll.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/FaciesThresholds_Davis.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011p-e.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_PErecon_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_R_Script_LLRecon_012414.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_R_Script_MoistureBalance_011414.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_cores.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_Iterations_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_LLrecon_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011loi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011ll.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/FaciesThresholds_Davis.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011p-e.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_PErecon_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_R_Script_LLRecon_012414.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_R_Script_MoistureBalance_011414.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_cores.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_Iterations_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_LLrecon_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011loi.txt English https://www.ncdc.noaa.gov/paleo/study/16094 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011ll.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/FaciesThresholds_Davis.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011p-e.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_PErecon_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_R_Script_LLRecon_012414.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_R_Script_MoistureBalance_011414.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_cores.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_Iterations_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/Davis_LLrecon_012414.csv https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/davis2011loi.txt Paige E. Newby, Bryan N. Shuman, Jeffrey P. Donnelly, Dana MacDonald2011Repeated century-scale droughts over the past 13,000 yr near the Hudson River watershed, USAQuaternary Research753523-53010.1016/j.yqres.2011.01.006http://www.sciencedirect.com/science/article/pii/S0033589411000172 Paul Pribyl and Bryan N. Shuman2014A Computational Approach to Quaternary Lake-Level Reconstruction Applied in the Central Rocky Mountains, Wyoming, USAQuaternary Research START YEAR: 16787 cal yr BP * END YEAR: 2 cal yr BP -73.4077 42.1355 -73.4077 42.1355