Medieval Warming, Little Ice Age, and European impact on the environment during the last millennium in the lower Hudson Valley, New York, USA |
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| Authors: | Dee Cabaniss Pederson Dorothy M Peteet Dorothy Kurdyla Tom Guilderson |
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| Institution: | aLamont-Doherty Earth Observatory, 61 Rte. 9W, Palisades, NY 10964, USA;bNASA/Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA;cLawrence Livermore National Laboratory, Center for Accelerated Mass Spectrometry, 7000 East Avenue, L-403, Livermore, CA 94550, USA |
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| Abstract: | Establishing natural climate variability becomes particularly important in large urban areas in anticipation of droughts. We present a well-dated bi-decadal record of vegetation, climate, land use, and fire frequency from a tidal marsh in the Hudson River Estuary. The classic Medieval Warm Period is evident through striking increases in charcoal and Pinus dominance from  800–1300 A.D., paralleling paleorecords southward along the Atlantic seaboard. Higher inputs of inorganic sediment during this interval suggest increased watershed erosion during drought conditions. The presence of the Little Ice Age ensues with increases in Picea and Tsuga, coupled with increasing organic percentages due to cooler, moister conditions. European impact is manifested by a decline in arboreal pollen due to land clearance, increased weedy plant cover (i.e., Ambrosia, Plantago, and Rumex), and an increase in inorganic particles to the watershed. |
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| Keywords: | Pollen Charcoal Climate Medieval Warming Little Ice Age Land use Hudson Valley Phragmites Typha |
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