noaa-lake-16075 Berry Pond, Massachusetts 8200 YrBP Leaf Wax Hydrogen Isotope Data Shuman, B.N.; Huang, Y.; Newby, P.E.; Wang, Y. Berry Pond, Massachusetts 8200 YrBP Leaf Wax Hydrogen Isotope Data 2014-01-24 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16075 Investigator B.N. Shuman Investigator Y. Huang Investigator P.E. Newby Investigator Y. Wang earth science paleoclimate paleolimnology delta 2H,C26 n-alkanoic acid,null,per mil VSMOW,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology delta 2H,palmitic acid,null,per mil VSMOW,null,paleolimnology,null,null,N,C16 palmitic acid earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology hydrogen isotopes geoscientificInformation abrupt climate change 12966 cal yr BP 70 cal yr BP Complete 42.505 42.505 -73.319 -73.319 630 630 Continent North America United States Of America Massachusetts Berry Pond>LATITUDE 42.505>LONGITUDE -73.319 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Bryan Shuman, Yongsong Huang, Paige Newby, Yi Wang 2006 Quaternary Science Reviews 25 21-22 2992-3002 10.1016/j.quascirev.2006.02.021 http://www.sciencedirect.com/science/article/pii/S0277379106001557

We analyzed the hydrogen isotopic composition of sedimentary leaf wax (C28n-acid) and palmitic acid (C16n-acid) in cores from Berry and Crooked Ponds in Massachusetts. The results show a dramatic positive shift in leaf wax dD values around 8200 cal yr BP, when regional lake levels rose and plant communities shifted in favor of plants intolerant of dry conditions. To aid our interpretation, we studied modern lake sediment samples and found that the dD values of leaf wax and palmitic acid record the hydrogen isotopic composition of water available during the synthesis of these compounds. Palmitic acid dD values follow lake water values often derived from winter precipitation, and leaf wax dD values track the water available to terrestrial plants during the growing season. Based on these results, we interpret the downcore isotopic shift as an increase in the fraction of precipitation falling during the growing season. The increase coincides with evidence from pollen and palmitic acid dD values for a multi-century period of cold conditions at ca 8200 cal yr BP. The close timing of the brief cool period and a step-change in summer precipitation levels in the northeastern United States is consistent with the hypothesis that the collapse of the Laurentide ice sheet occurred in association with cold North Atlantic conditions from 8400 to 8000 cal yr BP. The location of the northeastern US downwind of the ice sheet and close to the North Atlantic makes it sensitive to both factors. Our results also provide insight into later changes in the northeastern US because they indicate a progressive decrease in summer precipitation levels after ca 8000 cal yr BP. STUDY NOTES: Hydrogen isotope (dD) data of sedimentary leaf wax (C28n-acid) and palmitic acid (C16n-acid) from Berry Pond, western Massachusetts.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/massachusetts/berry2006dd.txt Data File; Berry Pond Leaf Wax dD Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11