Accession Number : ADP007340

Title :   High-Latitude Tree-Ring Data: Records of Climatic Change and Ecological Response,

Corporate Author : ARIZONA UNIV TUCSON LAB OF TREE-RING RESEARCH

Personal Author(s) : Graumlich, Lisa J.

Report Date : MAR 1992

Pagination or Media Count : 5

Abstract : Tree-ring data provide critical information regarding two fundamental questions as to the role of the polar regions in global change: (1) what is the nature of climatic variability? and (2) what is the response of vegetation to climatic variability? Treering-based climatic reconstructions document the variability of the climate system on time scales of years to centuries. Dendroclimatic reconstructions indicate that the climatic episodes defined on the basis of documentary evidence in western Europe (i.e., Medieval Warm Episode, ca. A.D. 1000-1300; Little Ice Age, ca. A.D. 15501850) can be observed at some high-latitude sites (ex., Polar Urals). Spatial variation in long-term temperature trends (ex., northern Fennoscandia vs. Polar Urals) demonstrates the importance of regional-scale climatic controls. When collated into global networks, proxy-based climatic reconstructions can be used to test hypotheses as to the relative importance of external forcing vs. internal variation in governing climatic variation. Specifically, such a global network would allow the quantification of the climatic response to various permutations of factors thought to be important in governing decadal- to centennial-scale climatic variation (i.e., solar insolation, volcanic activity, trace gas concentrations)

Descriptors :   *CLIMATE, *HIGH LATITUDES, *VARIATIONS, *ECOSYSTEMS, *TREE RING ANALYSIS, DOCUMENTS, EXTERNAL, GLOBAL, HYPOTHESES, ICE, INTERNAL, LATITUDE, NETWORKS, PERMUTATIONS, POLAR REGIONS, REGIONS, RESPONSE, RINGS, SCALE, TEMPERATURE, TEST AND EVALUATION, TIME, TREES, VEGETATION, SYMPOSIA, NORTHERN HEMISPHERE.

Subject Categories : Geography
      Forestry
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE