Boreal temperature variability inferred from maximum latewood density and tree-ring width data, Wrangell Mountain region, Alaska

LDEO Publication: 
Publication Type  Journal Article
Year of Publication  2003
Authors  Davi, N. K.; Jacoby, G. C.; Wiles, G. C.
Journal Title  Quaternary Research
Volume  60
Issue  3
Pages  252-262
Journal Date  Nov
ISBN Number  0033-5894
Accession Number  ISI:000187180800002
LDEO Publication Number  6509
Key Words  paleoclimate; tree-rings; maximum latewood density; ring width; temperature; boreal; alaska; north-america; air-temperature; time-series; growth; 20th-century; chronologies; centuries; latitudes; climate; ice

Variations in both width and density of annual rings from a network of tree chronologies were used to develop high-resolution proxies to extend the climate record in the Wrangell Mountain region of Alaska. We developed a warm-season (July-September) temperature reconstruction that spans A.D. 1593-1992 based on the first eigenvector from principal component analysis of six maximum latewood density (MXD) chronologies. The climate/tree-growth model accounts for 51% of the temperature variance from 1958 to 1992 and shows cold in the late 1600s-early 1700s followed by a warmer period, cooling in the late 1700s-early 1800s, and warming in the 20th century. The 20th century is the warmest of the past four centuries. Several severely cold warm-seasons coincide with major volcanic eruptions. The first eigenvector from a ring-width (RW) network, based on nine chronologies from the Wrangell Mountain region (A.D. 1550-1970), is correlated positively with both reconstructed and recorded Northern Hemisphere temperatures. RW shows a temporal history similar to that of MXD by increased growth (warmer) and decreased growth (cooler) intervals and trends. After around 1970 the RW series show a decrease in growth, while station data show continued warming, which may be related to increasing moisture stress or other factors. Both the temperature history based on MXD and the growth trends from the RW series are consistent with well-dated glacier fluctuations in the Wrangell Mountains and some of the temperature variations also correspond to variations in solar activity. (C) 2003 University of Washington. Published by Elsevier Inc. All rights reserved.


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URL  <Go to ISI>://000187180800002
DOI  Doi 10.1016/S0033-5894(03)00115-7