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Evidence of long-term seasonal climate forcing in rhizolith isotopes during the last glaciation

Geophysical Research Letters

By:
, , and
DOI: 10.1029/2004GL020207

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Abstract

High density carbonate rhizoliths were found from a loess-paleosol succession from the late Wisconsin period (21-11 ka) in Illinois. Their morphology shows that they formed in a close contact with living and decomposing roots, suggesting a root/microbial respiration origin. Carbon (??13C) and oxygen (??18O) isotopic analyses were performed on 36 and 37 individual rhizoliths of two separate 10 cm intervals and 98 bulk rhizoliths of all 10 cm intervals. The results of the individual rhizolith ??13C and ??18O analyses suggest that the carbon source was largely derived from respiring C3, C4 and microbial biomass, and that meteoric water was controlled mainly by warm-season precipitation. The results of bulk rhizolith ??13C and ??18O analyses show that warm-season proxies varied in phase with glacial fluctuations at submillennial scales, suggesting long-term seasonal forcing may have played an important role on climate change during the late Wisconsin glaciation in North America. Copyright 2004 by the American Geophysical Union.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Evidence of long-term seasonal climate forcing in rhizolith isotopes during the last glaciation
Series title:
Geophysical Research Letters
DOI:
10.1029/2004GL020207
Volume
31
Issue:
13
Year Published:
2004
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters