Testing Pollen Sorted by Flow Cytometry as the Basis for High-Resolution Lacustrine Chronologies
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Indiana Univ., Bloomington, IN (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
Documenting leads and lags in terrestrial records of past climate change is critical to understanding the behavior of Earth’s natural climate system and making reliable predictions of future climate conditions. However, uncertainties of several hundred years in age models make it difficult to distinguish synchronicity and feedbacks in paleo archives. In lakes this is often due to the lack of terrestrial macrofossils in climate-sensitive locations, such as high alpine or dryland settings. The potential of radiocarbon (14C) dating of pollen has long been recognized, but the difficulty of cleanly separating pollen from other kinds of organic carbon has limited its usefulness. Here we report 14C ages on pollen separated by flow cytometry, from a set of closely spaced samples from Mono Lake, California. The accuracy of the pollen ages is tested using well-dated bracketing tephras, the South Mono and North Mono-Inyo tephras. In spite of the purity of the sorted samples, the pollen dates are older than the bounding tephras by ~400 yr, similar to some other pollen-dating studies. While improvements in sample preparation protocols are planned, understanding the geological processes involved in the production, preservation, and deposition of pollen at each site will be critical to developing robust high-resolution age models.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1959676
- Report Number(s):
- LLNL-JRNL-725175; 874918
- Journal Information:
- Radiocarbon, Journal Name: Radiocarbon Journal Issue: 1 Vol. 61; ISSN 0033-8222
- Publisher:
- Cambridge University PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
An Improved Method for Extracting, Sorting, and AMS Dating of Pollen Concentrates From Lake Sediment
A CHRONOLOGICAL FRAMEWORK FOR THE HOLOCENE VEGETATIONAL HISTORY OF CENTRAL MINNESOTA: THE STEEL LAKE POLLEN RECORD
Journal Article
·
Mon May 24 20:00:00 EDT 2021
· Frontiers in Ecology and Evolution
·
OSTI ID:1784571
A CHRONOLOGICAL FRAMEWORK FOR THE HOLOCENE VEGETATIONAL HISTORY OF CENTRAL MINNESOTA: THE STEEL LAKE POLLEN RECORD
Journal Article
·
Sun Nov 09 23:00:00 EST 2003
· Quaternary Science Reviews
·
OSTI ID:15013695