TY - THES T1 - A New Computerized X-ray Densitometric System for Tree-Ring Analysis T2 - Geoscience Y1 - 1984 A1 - McCord, Virgil Alexander Stuart AB -

A new facility for X-ray densitometric analysis is in operation at the Laboratory of Tree-Ring Research. Tree-ring specimens are cute to a uniform thickness of 1.0 mm and contact radiographs are produced. The radiographs are scanned by a modified Joyce-Loebl optical microdesitometer interfaced with an Apple II microcomputer. The film optical densities are sampled at 0.02 mm increments and stored on magnetic disks. A battery of computer programs has been developed to edit and process these data, and to transform them into annual time series of various wood density characteristics for each specimen. Several of the programs employ interactive high-resolution graphics to enable the operator to ensure that the resulting series are accurate and complete. Data produced include maximum latewood density, minimum earlywood density, total ring width, average annual density, and integrated annual density. These parameters can be employed as paleoenvironmental indicators.

JF - Geoscience PB - University of Arizona VL - MS UR - http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=753909891&sid=1&Fmt=1&clientId=43922&RQT=309&VName=PQD ER - TY - BOOK T1 - Tree Ring Chronologies of the Southern Hemisphere 1. Argentina T2 - Tree Ring Chronologies of the Southern Hemisphere Y1 - 1979 A1 - LaMarche, V.C. A1 - Holmes, R.L. A1 - Dunwiddie, P.W. A1 - Drew, L.G. KW - argentina KW - chronology KW - date KW - dendrochronology KW - hemisphere KW - south america KW - southern KW - tree ring JF - Tree Ring Chronologies of the Southern Hemisphere PB - Laboratory of Tree-Ring Research CY - Tucson ER - TY - BOOK T1 - Tree Ring Chronologies of the Southern Hemisphere 2. Chile T2 - Tree Ring Chronologies of the Southern Hemisphere Y1 - 1979 A1 - LaMarche, V.C. A1 - Holmes, R.L. A1 - Dunwiddie, P.W. A1 - Drew, L.G. KW - chile KW - chronology KW - date KW - dendrochronology KW - south america KW - southern hemisphere KW - tree ring JF - Tree Ring Chronologies of the Southern Hemisphere ER - TY - BOOK T1 - Tree Ring Chronologies of the Southern Hemisphere 3. New Zealand T2 - Tree Ring Chronologies of the Southern Hemisphere Y1 - 1979 A1 - LaMarche, V.C. A1 - Holmes, R.L. A1 - Dunwiddie, P.W. A1 - Drew, L.G. KW - chronologies KW - date KW - dendrochronology KW - new zealand KW - southern hemisphere JF - Tree Ring Chronologies of the Southern Hemisphere PB - The Tree Ring Laboratory CY - Tucson ER - TY - BOOK T1 - Tree Ring Chronologies of the Southern Hemisphere 5. South Africa T2 - Tree Ring Chronologies of the Southern Hemisphere Y1 - 1979 A1 - LaMarche, V.C. A1 - Holmes, R.L. A1 - Dunwiddie, P.W. A1 - Drew, L.G. KW - africa KW - chronology KW - date KW - dendrochronology KW - south africa KW - southern hemisphere KW - tree ring JF - Tree Ring Chronologies of the Southern Hemisphere PB - Laboratory of Tree Ring Research CY - Tucson ER - TY - JOUR T1 - Tree-ring evidence of past climatic variability JF - Nature Y1 - 1978 A1 - LaMarche, V.C. KW - ancient KW - climate KW - environment KW - paleoclimatology KW - past KW - record KW - tree ring VL - 276 IS - No. 5686 N1 -

Copies of this are available through the Tree Ring Laboratory. Please contact the lab for more information.

ER - TY - JOUR T1 - Tree Rings, Glacial Advance, And Climate in The Alps JF - Zeitschrift fur Gletscherkunde und Glazialgeologie Y1 - 1971 A1 - LaMarche, V.C. A1 - Fritts, H. KW - alps KW - austria KW - climatology KW - environment KW - glacial advance KW - glaciers KW - Switzerland KW - tree ring AB -

Ring-width variations in stone pine near upper treeline in the Alps show a high negative correlation with the percentage of advancing glaciers in Austria and Switzerland. The relationship is due to the similarity of climatic models for tree growth and the glacial mass budget. Tree-ring fluctuations during the period 1800-1889, prior to the compilation of glacial statistics show good agreement with historical glacial advances and periods of low summer temperatures, especially around 1820-1855. Tree-ring studies could assist in reconstructing the glacial and climatic history of the Alps, possibly for a period of 1,000 years or more.

VL - VII N1 -

Copies of this are available through the Tree Ring Laboratory; please contact the lab for more information.

ER - TY - BOOK T1 - Climate from Tree Rings Y1 - 0 A1 - Hughes, M.K. A1 - LaMarche, V.C. A1 - Pilcher, J.R. A1 - Kelly, P.M. KW - climate KW - dendrochronology KW - paleoclimatology KW - tree rings PB - Cambridge University Press N1 -

Copies of this are available in the Tree Ring Laboratory. Please contact the curator for more information. pcreasman@ltrr.arizona.edu

ER -