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  • American Association for the Advancement of Science (AAAS)  (1)
  • Canadian Science Publishing  (1)
  • American Institute of Physics (AIP)
  • Amsterdam : Elsevier
  • Geological Society of America (GSA)
  • 2015-2019
  • 2000-2004  (2)
  • 1995-1999
  • 2003  (2)
Collection
Publisher
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  • 2015-2019
  • 2000-2004  (2)
  • 1995-1999
Year
  • 1
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    Growth rate predicts mortality of Abies concolor in both burned and unburned stands (2003)
    Canadian Science Publishing
    Details
    Publication Date: 2003-06-01
    Description: Tree mortality is often the result of both long-term and short-term stress. Growth rate, an indicator of long-term stress, is often used to estimate probability of death in unburned stands. In contrast, probability of death in burned stands is modeled as a function of short-term disturbance severity. We sought to narrow this conceptual gap by determining (i) whether growth rate, in addition to crown scorch, is a predictor of mortality in burned stands and (ii) whether a single, simple model could predict tree death in both burned and unburned stands. Observations of 2622 unburned and 688 burned Abies concolor (Gord. & Glend.) Lindl. (white fir) in the Sierra Nevada of California, U.S.A., indicated that growth rate was a significant predictor of mortality in the unburned stands, while both crown scorch and radial growth were significant predictors of mortality in the burned stands. Applying the burned stand model to unburned stands resulted in an overestimation of the unburned stand mortality rate. While failing to create a general model of tree death for A. concolor, our findings underscore the idea that similar processes may affect mortality in disturbed and undisturbed stands.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 2
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    Stratospheric memory and skill of extended-range weather forecasts (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-08-02
    Description: We use an empirical statistical model to demonstrate significant skill in making extended-range forecasts of the monthly-mean Arctic Oscillation (AO). Forecast skill derives from persistent circulation anomalies in the lowermost stratosphere and is greatest during boreal winter. A comparison to the Southern Hemisphere provides evidence that both the time scale and predictability of the AO depend on the presence of persistent circulation anomalies just above the tropopause. These circulation anomalies most likely affect the troposphere through changes to waves in the upper troposphere, which induce surface pressure changes that correspond to the AO.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baldwin, Mark P -- Stephenson, David B -- Thompson, David W J -- Dunkerton, Timothy J -- Charlton, Andrew J -- O'Neill, Alan -- New York, N.Y. -- Science. 2003 Aug 1;301(5633):636-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Northwest Research Associates, 14508 NE 20th Street, Bellevue, WA, 98007, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12893941" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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