Spatial expression of ENSO, drought, and summer monsoon in seasonal δ13C of ponderosa pine tree rings in southern Arizona and New Mexico

Steven Leavitt, William E. Wright, Austin Long

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Major climatic impacts from ENSO and the North American Monsoon in the U.S. Southwest provide fortuitous circumstances for exploring the suitability of stable-carbon isotope (δ13 C) composition of tree rings to represent and reconstruct interannual climate variability. We sampled ponderosa pine tree rings at eight sites in seven mountain ranges over a 500-km transect in southern Arizona and New Mexico. We developed δ13C chronologies for 1985-1995 by subdividing rings into pre- and post-monsoon-onset segments based on the presence of a false-latewood band in each ring induced by the arid period immediately preceding the summer monsoon, pooling these segments from multiple trees at each site, and analyzing the cellulose component. Chronologies from two subsets of trees from the same site and separate chronologies from two different sites in the same mountain range indicate strong coherence and signal reproducibility. Additionally, the seasonal δ13C patterns showed remarkable coherence across the transect, with the spatially disjunct easternmost chronology tending to be most frequently dissimilar. The δ13 C values of ring subdivisions before the false-latewood band are generally positively correlated with winter Southern Oscillation Indices (SOI), resulting from the ENSO teleconnexion with southwestern winter/early spring precipitation. The 1313C from these sites correlates with monthly Palmer Drought Severity Indices (PDSI), with the strongest correlations occurring in progressively later months from first-formed to last-formed subdivisions. The post-false latewood subdivision 1313C was particularly strongly correlated with summer precipitation amount. These results confirm the strong influence of moisture on tree ring δ13C and support their use in both temporal and spatial modes to infer past climate variability.

Original languageEnglish (US)
JournalJournal of Geophysical Research: Space Physics
Volume107
Issue number18
DOIs
StatePublished - 2002

Fingerprint

drought
monsoons
Drought
Mexico
tree ring
El Nino-Southern Oscillation
summer
chronology
monsoon
Carbon Isotopes
subdivisions
rings
Cellulose
Moisture
transect
mountains
winter
climate
Southern Oscillation
teleconnection

Keywords

  • Carbon isotopes
  • Drought
  • Ponderosa pine
  • Rainfall
  • Southwest
  • Tree rings

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

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title = "Spatial expression of ENSO, drought, and summer monsoon in seasonal δ13C of ponderosa pine tree rings in southern Arizona and New Mexico",
abstract = "Major climatic impacts from ENSO and the North American Monsoon in the U.S. Southwest provide fortuitous circumstances for exploring the suitability of stable-carbon isotope (δ13 C) composition of tree rings to represent and reconstruct interannual climate variability. We sampled ponderosa pine tree rings at eight sites in seven mountain ranges over a 500-km transect in southern Arizona and New Mexico. We developed δ13C chronologies for 1985-1995 by subdividing rings into pre- and post-monsoon-onset segments based on the presence of a false-latewood band in each ring induced by the arid period immediately preceding the summer monsoon, pooling these segments from multiple trees at each site, and analyzing the cellulose component. Chronologies from two subsets of trees from the same site and separate chronologies from two different sites in the same mountain range indicate strong coherence and signal reproducibility. Additionally, the seasonal δ13C patterns showed remarkable coherence across the transect, with the spatially disjunct easternmost chronology tending to be most frequently dissimilar. The δ13 C values of ring subdivisions before the false-latewood band are generally positively correlated with winter Southern Oscillation Indices (SOI), resulting from the ENSO teleconnexion with southwestern winter/early spring precipitation. The 1313C from these sites correlates with monthly Palmer Drought Severity Indices (PDSI), with the strongest correlations occurring in progressively later months from first-formed to last-formed subdivisions. The post-false latewood subdivision 1313C was particularly strongly correlated with summer precipitation amount. These results confirm the strong influence of moisture on tree ring δ13C and support their use in both temporal and spatial modes to infer past climate variability.",
keywords = "Carbon isotopes, Drought, Ponderosa pine, Rainfall, Southwest, Tree rings",
author = "Steven Leavitt and Wright, {William E.} and Austin Long",
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T1 - Spatial expression of ENSO, drought, and summer monsoon in seasonal δ13C of ponderosa pine tree rings in southern Arizona and New Mexico

AU - Leavitt, Steven

AU - Wright, William E.

AU - Long, Austin

PY - 2002

Y1 - 2002

N2 - Major climatic impacts from ENSO and the North American Monsoon in the U.S. Southwest provide fortuitous circumstances for exploring the suitability of stable-carbon isotope (δ13 C) composition of tree rings to represent and reconstruct interannual climate variability. We sampled ponderosa pine tree rings at eight sites in seven mountain ranges over a 500-km transect in southern Arizona and New Mexico. We developed δ13C chronologies for 1985-1995 by subdividing rings into pre- and post-monsoon-onset segments based on the presence of a false-latewood band in each ring induced by the arid period immediately preceding the summer monsoon, pooling these segments from multiple trees at each site, and analyzing the cellulose component. Chronologies from two subsets of trees from the same site and separate chronologies from two different sites in the same mountain range indicate strong coherence and signal reproducibility. Additionally, the seasonal δ13C patterns showed remarkable coherence across the transect, with the spatially disjunct easternmost chronology tending to be most frequently dissimilar. The δ13 C values of ring subdivisions before the false-latewood band are generally positively correlated with winter Southern Oscillation Indices (SOI), resulting from the ENSO teleconnexion with southwestern winter/early spring precipitation. The 1313C from these sites correlates with monthly Palmer Drought Severity Indices (PDSI), with the strongest correlations occurring in progressively later months from first-formed to last-formed subdivisions. The post-false latewood subdivision 1313C was particularly strongly correlated with summer precipitation amount. These results confirm the strong influence of moisture on tree ring δ13C and support their use in both temporal and spatial modes to infer past climate variability.

AB - Major climatic impacts from ENSO and the North American Monsoon in the U.S. Southwest provide fortuitous circumstances for exploring the suitability of stable-carbon isotope (δ13 C) composition of tree rings to represent and reconstruct interannual climate variability. We sampled ponderosa pine tree rings at eight sites in seven mountain ranges over a 500-km transect in southern Arizona and New Mexico. We developed δ13C chronologies for 1985-1995 by subdividing rings into pre- and post-monsoon-onset segments based on the presence of a false-latewood band in each ring induced by the arid period immediately preceding the summer monsoon, pooling these segments from multiple trees at each site, and analyzing the cellulose component. Chronologies from two subsets of trees from the same site and separate chronologies from two different sites in the same mountain range indicate strong coherence and signal reproducibility. Additionally, the seasonal δ13C patterns showed remarkable coherence across the transect, with the spatially disjunct easternmost chronology tending to be most frequently dissimilar. The δ13 C values of ring subdivisions before the false-latewood band are generally positively correlated with winter Southern Oscillation Indices (SOI), resulting from the ENSO teleconnexion with southwestern winter/early spring precipitation. The 1313C from these sites correlates with monthly Palmer Drought Severity Indices (PDSI), with the strongest correlations occurring in progressively later months from first-formed to last-formed subdivisions. The post-false latewood subdivision 1313C was particularly strongly correlated with summer precipitation amount. These results confirm the strong influence of moisture on tree ring δ13C and support their use in both temporal and spatial modes to infer past climate variability.

KW - Carbon isotopes

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KW - Southwest

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