Crooked Pond, Massachusetts 15,000 Year Lake Level and Hydrogen Isotope Data Shuman, B.N.; Bravo, J.; Kaye, J.; Lynch, J.A.; Newby, P.E.; Webb, T. Shuman, B.N. Bravo, J. Kaye, J. Lynch, J.A. Newby, P.E. Webb, T. earth science/paleoclimate/lake levels|paleolimnology (notes,null,null,null,null,lake levels|paleolimnology,null,null,C,null) earth science/paleoclimate/lake levels|paleolimnology (age,null,range upper bound,calendar year before present,null,lake levels|paleolimnology,null,null,N,null) earth science/paleoclimate/lake levels|paleolimnology (lake level,null,range upper bound,meter,null,lake levels|paleolimnology,null,null,N,relative to present) earth science/paleoclimate/paleolimnology (delta 2H,palmitic acid,null,per mil VSMOW,null,paleolimnology,null,null,N,C16 palmitic acid) earth science/paleoclimate/lake levels|paleolimnology (age,null,null,calendar year before present,null,lake levels|paleolimnology,null,null,N,null) earth science/paleoclimate/lake levels|paleolimnology (lake level,null,range lower bound,meter,null,lake levels|paleolimnology,null,null,N,relative to present) earth science/paleoclimate/lake levels|paleolimnology (sample identification,null,null,null,null,lake levels|paleolimnology,null,null,C,null) earth science/paleoclimate/lake levels|paleolimnology (age,null,range lower bound,calendar year before present,null,lake levels|paleolimnology,null,null,N,null) earth science/paleoclimate/lake levels|paleolimnology (lake level,null,null,meter,null,lake levels|paleolimnology,null,null,N,relative to present) earth science/paleoclimate/paleolimnology (Crooked Pond>LATITUDE 41.5>LONGITUDE -70.5) Sediment cores collected along a transect in Crooked Pond, southeastern Massachusetts, provide evidence of water-level changes between 15,000 cal yr B.P. and present. The extent of fine-grained, detrital, organic accumulation in the basin, inferred from sediment and pollen stratigraphies, varied over time and indicates low water levels between 11,200 and 8000 cal yr B.P. and from ca. 5300 to 3200 cal yr B.P. This history is consistent with the paleohydrology records from nearby Makepeace Cedar Swamp and other sites from New England and eastern Canada and with temporal patterns of regional changes in effective soil moisture inferred from pollen data. The similarities among these records indicate that (1) regional conditions were drier than today when white pine (Pinus strobus) grew abundantly in southern New England (11,200 to 9500 cal yr B.P.); (2) higher moisture levels existed between 8000 and 5500 cal yr B.P., possibly caused by increased meridonal circulation as the influence of the Laurentide ice sheet waned; and (3) drier conditions possibly contributed to the regional decline in hemlock (Tsuga) abundances at 5300 cal yr B.P. Although sea-level rise may have been an influence, moist climatic conditions during the late Holocene were the primary reason for a dramatic rise in water-table elevations. STUDY NOTES: Crooked Pond, Massachusetts Lake Level and Hydrogen Isotope Data. Reconstructed water-level changes between 15,000 cal yr B.P. and present, based on sediment and pollen stratigraphies (Shuman et al. 2001). Palmitic acid dD as a proxy for lake water temperature (Huang et al. 2002). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Shuman, B.N. Investigator : Bravo, J. Investigator : Kaye, J. Investigator : Lynch, J.A. Investigator : Newby, P.E. Investigator : Webb, T. 2006-03-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5444 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/newengland/crookedpond.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/newengland/crookedpond.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/newengland/crookedpond.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/newengland/crookedpond.xls English https://www.ncdc.noaa.gov/paleo/study/5444 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/newengland/crookedpond.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/newengland/crookedpond.xls Shuman, B., J. Bravo, J. Kaye, J.A. Lynch, P. Newby, T. Webb. 2001. Late Quaternary Water-Level Variations and Vegetation History at Crooked Pond, Southeastern Massachusetts. Quaternary Research 56(3), 401-410. START YEAR: 14278 cal yr BP * END YEAR: 0 cal yr BP -70.5 41.5 -70.5 41.5