A high-resolution hydrogen isotope record of behenic acid for the past 16 kyr in the northeastern United States

TitleA high-resolution hydrogen isotope record of behenic acid for the past 16 kyr in the northeastern United States
Publication TypeJournal Article
Year of Publication2017
AuthorsGao, L, Huang, Y, Shuman, B, W. Oswald, W, Foster, D
JournalQuaternary International
Date Published2017/07/03/
ISBN Number1040-6182
Accession NumberHBR.2017-46
KeywordsDrought, Holocene climate, Hydrogen isotopes, Leaf lipids, New England, Northeastern USA, Precipitation-weighted temperature
Abstract

D/H ratios of leaf lipids from lacustrine aquatic macrophytes have been shown to record precipitation δD values, which can reflect precipitation-weighted mean annual temperature (MAT) in the northeastern United States. Here we report a high-resolution hydrogen isotopic record from Little Pond, Massachusetts, USA, which we compare with other paleoclimate data from the region, including a similar δD record from Blood Pond, Massachusetts. Together the two datasets provide a >16 ka record of δD variability in the region, affording new insights into Holocene climate history. First, the long-term trends in δD correlate significantly with regional temperatures inferred from alkenone records from nearby areas of the North Atlantic and lake-level inferred changes in precipitation and evaporation. The long-term δD trends reflect a period of maximum regional warmth at ca. 8–6 ka after the collapse of the Laurentide Ice Sheet. Second, unlike the positive relationship between temperature and δD observed over the long-term and during early events like the Younger Dryas, we find that a series of warm and dry events at 4.9–4.6, 4.2–3.9, 2.9–2.1, and 1.3–1.2 cal kya BP coincide with negative δD excursions from the long trends. These events were likely driven by summer drought dynamics.

URLhttp://www.sciencedirect.com/science/article/pii/S1040618216312605
DOI10.1016/j.quaint.2017.06.053
Short TitleQuaternary International