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Title: Wetter Summers Mitigated Temperature Stress on Rocky Mountain Forests During the Last Interglacial Warm Period

Journal Article · · Geophysical Research Letters
ORCiD logo [1];  [2]; ORCiD logo [3]
  1. Univ. of Illinois, Chicago, IL (United States); University of Illinois at Chicago
  2. Northeastern Illinois Univ., Chicago, IL (United States)
  3. Univ. of Wyoming, Laramie, WY (United States)

Recent droughts have highlighted concerns of how rising summer temperatures will increase tree mortality rates across the western United States. We analyzed subfossil wood samples from Colorado dating to the last interglacial to assess the response of two common conifers to a previous warm period. The trees experienced comparable growth rates and water use efficiency during the interglacial relative to modern despite evidence from model simulations of a ~30% increase in evaporative demand during the peak of the growing season. High-resolution isotopic analysis of the wood samples show an enrichment in the late season cellulosic δ18O relative to modern samples, which we find was associated with increased reliance on summer rain. The data are consistent with model simulations showing the interglacial was associated with wetter summers across the western US. Here, we propose enhanced summer rain during this period compensated for drought stress imposed by higher evaporative demand.

Research Organization:
Univ. of Illinois, Chicago, IL (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0019210
OSTI ID:
1826746
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 18 Vol. 48; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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