Christie, Margaret and Bernhardt, Christopher and Parnell, Andrew and Shaw, Timothy and Khan, Nicole and Corbett, D. and García-Artola, Ane and Clear, Jennifer and Walker, Jennifer and Donnelly, Jeffrey and Hasse, Tobias and Horton, Benjamin (2021) Pollen Geochronology from the Atlantic Coast of the United States during the Last 500 Years. Water, 13 (362). pp. 1-37. ISSN 2073-4441

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Abstract

Building robust age–depth models to understand climatic and geologic histories from coastal sedimentary archives often requires composite chronologies consisting of multi-proxy age markers. Pollen chronohorizons derived from a known change in vegetation are important for age–depth models, especially those with other sparse or imprecise age markers. However, the accuracy of pollen chronohorizons compared to other age markers and the impact of pollen chronohorizons on the precision of age–depth models, particularly in salt marsh environments, is poorly understood. Here, we combine new and published pollen data from eight coastal wetlands (salt marshes and mangroves) along the Atlantic Coast of the United States (U.S.) from Florida to Connecticut to define the age and uncertainty of 17 pollen chronohorizons. We found that 13 out of 17 pollen chronohorizons were consistent when compared to other age markers (radiocarbon, radionuclide 137Cs and pollution markers). Inconsistencies were likely related to the hyperlocality of pollen chronohorizons, mixing of salt marsh sediment, reworking of pollen from nearby tidal flats, misidentification of pollen signals, and inaccuracies in or misinterpretation of other age markers. Additionally, in a total of 24 models, including one or more pollen chronohorizons, increased precision (up to 41 years) or no change was found in 18 models.

Item Type:	Article
Keywords:	pollen; age–depth models; geochronology; Holocene; coastal wetlands;
Academic Unit:	Faculty of Science and Engineering > Mathematics and Statistics Faculty of Science and Engineering > Research Institutes > Hamilton Institute Faculty of Social Sciences > Research Institutes > Irish Climate Analysis and Research Units, ICARUS
Item ID:	18997
Identification Number:	https://doi.org/10.3390/w13030362
Depositing User:	Andrew Parnell
Date Deposited:	09 Oct 2024 14:20
Journal or Publication Title:	Water
Publisher:	MDPI
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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