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  • 2010-2014  (15)
  • 1975-1979  (3)
  • 1
    Call number: AWI G5-10-0074 ; M 11.0047
    In: Developments in paleoenvironmental research
    Description / Table of Contents: Chapter 1: High-resolution Paleoclimatology - R. Bradley What is high-resolution paleoclimatology? What are its major achievements? What opportunities and challenges does it now face? What should dendroclimatology's role be in this? Chapter 2: Dendroclimatology in high-resolution Paleoclimatology - M. K. Hughes, H. F. Diaz and Th. W. Swetnam An overview of the development of dendroclimatology and an introduction to the questions posed in this book. Scientific bases of dendroclimatology Chapter 3: How well understood are the processes that create tree-ring records? - G. Vaganov Starting at the most basic level of the environmental control of tree-ring formation, do we have the necessary biological and ecophysiological understanding of this to support inferences about climate variability from tree rings? What are the weak points of this understanding and how might they be strengthened? Chapter 4: The state of the art of quantitative methods in dendroclimatology - E. Cook How sound are the quantitative techniques commonly used in dendroclimatology, in chronology building, identification and reconstruction of climate variables and the checking of these reconstructions? Are they appropriate to the material being analyzed and to the climatological problems being addressed? How might they be improved? Chapter 5: Detecting low-frequency change using tree rings - K. Briffa What limits the ability of tree-ring records to faithfully record climate variability at low frequencies (multi-centennial to millennial)? How might those limitations be overcome, if at all? What are the advantages and limitations of older and more novel approaches? What are the implications of these limitations? Reconstruction of climate patterns and values relative to today's climate Chapter 6: Dendroclimatology at regional and continental scales - R. Villalba What have been the major contributions of dendroclimatology to climatology so far? In what regions and for which climate problems is exciting progress now being made? What next? Chapter 7: Dendroclimatology at hemispheric and global scales - M. K. Hughes and M. Mann What are the achievements of dendroclimatology as applied at hemispheric and global scales climate patterns, circulation indices and large-scale means? What are the limitations of this approach? How might they be overcome? How might dendroclimatology contribute to the study of central pressing problems such as "How big is climate sensitivity? How has the last century, and especially recent decades, compared with earlier centuries? How faithful a representation of variability in recent centuries does the 20th century instrumental record give? Particular attention will be given to: a) identifying the most robust findings; and b) the most serious limitations. Chapter 8: Dendroclimatology, dendrohydrology and water resources management - C. Woodhouse and D. Meko How may dendroclimatology contribute to the study of water resources? How may it be used to inform modern public and decision-maker expectations of climate variability? Chapter 9: Dendroclimatology and the ecosystem impacts of climate - Th. W. SwetnamHow has dendroclimatology contributed to disturbance ecology? What is the significance of the recent changes in tree-growth-climate relationships observed in some regions, not only for dendroclimatology, but also for the understanding of the impacts of climate variability and change on ecosystems? Chapter 10: Dendroclimatology and the understanding of the interactions between climate variability and ancient human societies - D. Stahle and J. DeanHow has dendroclimatology contributed to understanding of the relationships between climate variability and societies in ancient times? Chapter 11: Tree rings and climate- sharpening the focus - M. K. Hughes, H. F. Diaz and Th. W. Swetnam What has been learned, using tree rings, about natural climate variability and its environmental and social impacts? What are the most significant strengths and weaknesses of dendroclimatology and the needs of, and opportunities for, future work.
    Description / Table of Contents: This volume presents an overview of the current state of dendroclimatology, its contributions over the last 30 years, and its future potential. The material included is useful not only to those who generate tree-ring records of past climate-dendroclimatologists, but also to users of their results - climatologists, hydrologists, ecologists and archeologists.
    Type of Medium: Monograph available for loan
    Pages: xii, 365 S. : Ill., graph. Darst.
    ISBN: 9781402040108
    Series Statement: Developments in paleoenvironmental research 11
    Classification:
    Historical Geology
    Language: English
    Note: Contents: Part I Introductory Section. - 1 High-Resolution Paleoclimatology / Raymond S. Bradley. - 2 Dendroclimatology in High-Resolution Paleoclimatology / Malcolm K. Hughes. - Part II Scientific Bases of Dendroclimatology. - 3 How Well Understood Are the Processes that Create Dendroclimatic Records? A Mechanistic Model of the Climatic Control on Conifer Tree-Ring Growth Dynamics / Eugene A. Vaganov, Kevin J. Anchukaitis, and Michael N. Evans. - 4 Uncertainty, Emergence, and Statistics in Dendrochronology / Edward R. Cook and Neil Pederson. - 5 A Closer Look at Regional Curve Standardization of Tree-Ring Records: Justification of the Need, a Warning of Some Pitfalls, and Suggested Improvements in Its Application / Keith R. Briffa and Thomas M. Melvin. - 6 Stable Isotopes in Dendroclimatology: Moving Beyond ‘Potential’ / Mary Gagen, Danny McCarroll, Neil J. Loader, and Iain Robertson. - Part III Reconstruction of Climate Patterns and Values Relative to Today’s Climate. - 7 Dendroclimatology from Regional to Continental Scales: Understanding Regional Processes to Reconstruct Large-Scale Climatic Variations Across the Western Americas / Ricardo Villalba, Brian H. Luckman, Jose Boninsegna,Rosanne D. D’Arrigo, Antonio Lara, Jose Villanueva-Diaz, Mariano Masiokas, Jaime Argollo, Claudia Soliz, Carlos LeQuesne, David W. Stahle, Fidel Roig, Juan Carlos Aravena, Malcolm K. Hughes, Gregory Wiles, Gordon Jacoby, Peter Hartsough, Robert J.S. Wilson, Emma Watson, Edward R. Cook, Julian Cerano-Paredes, Matthew Therrell, Malcolm Cleaveland, Mariano S. Morales, Nicholas E. Graham, Jorge Moya, Jeanette Pacajes, Guillermina Massacchesi, Franco Biondi, Rocio Urrutia, and Guillermo Martinez Pastur. - Part IV Applications of Dendroclimatology. - 8 Application of Streamflow Reconstruction to Water Resources Management / David M. Meko and Connie A. Woodhouse. - 9 Climatic Inferences from Dendroecological Reconstructions / Thomas W. Swetnam and Peter M. Brown. - 10 North American Tree Rings, Climatic Extremes, and Social Disasters / David W. Stahle and Jeffrey S. Dean. - Part V Overview. - 11 Tree Rings and Climate: Sharpening the Focus / Malcolm K. Hughes, Henry F. Diaz, and Thomas W. Swetnam. - Index.
    Location: Upper compact magazine
    Branch Library: AWI Library
    Branch Library: GFZ Library
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  • 2
    Publication Date: 2019-07-17
    Description: Past global climate changes had strong regional expression. To elucidate their spatio-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the past one to two millennia. The most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the nineteenth century. At multi-decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between ad 1580 and 1880, punctuated in some regions by warm decades during the eighteenth century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the period ad 1971–2000, the area-weighted average reconstructed temperature was higher than any other time in nearly 1,400 years.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 3
    Publication Date: 2014-11-01
    Print ISSN: 1523-0430
    Electronic ISSN: 1938-4246
    Topics: Geography , Geosciences
    Published by Taylor & Francis
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  • 4
    Publication Date: 2014-11-01
    Print ISSN: 0921-8181
    Electronic ISSN: 1872-6364
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 5
    Publication Date: 2012-03-01
    Print ISSN: 0921-8181
    Electronic ISSN: 1872-6364
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 6
    Publication Date: 2011-05-01
    Print ISSN: 0921-8181
    Electronic ISSN: 1872-6364
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 7
    Publication Date: 2012-12-01
    Print ISSN: 0921-8181
    Electronic ISSN: 1872-6364
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 8
    Publication Date: 2012-03-01
    Print ISSN: 0921-8181
    Electronic ISSN: 1872-6364
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 9
    Publication Date: 2014-02-24
    Description: Diagnosing the sensitivity of the tropical belt provides one framework for understanding how global precipitation patterns may change in a warming world. This paper seeks to understand boreal winter rates of subtropical dry zone expansion since 1979, and explores physical mechanisms. Various reanalysis estimates based on the latitude where zonal mean precipitation P exceeds evaporation E and the zero crossing latitude for the zonal mean meridional streamfunction () yield tropical width expansion rates in each hemisphere ranging from near zero to over 1° latitude decade−1. Comparisons with 30-yr trends computed from unforced climate model simulations indicate that the range among reanalyses is nearly an order of magnitude greater than the standard deviation of internal climate variability. Furthermore, comparisons with forced climate models indicate that this range is an order of magnitude greater than the forced change signal since 1979. Rapid widening rates during 1979–2009 derived from some reanalyses are thus viewed to be unreliable. The intercomparison of models and reanalyses supports the prevailing view of a tropical widening, but the forced component of tropical widening has likely been only about 0.1°–0.2° latitude decade−1, considerably less than has generally been assumed based on inferences drawn from observations and reanalyses. Climate model diagnosis indicates that the principal mechanism for forced tropical widening since 1979 has been atmospheric sensitivity to warming oceans. The magnitude of this widening and its potential detectability has been greater in the Southern Hemisphere than in the Northern Hemisphere during boreal winter, in part owing to Antarctic stratospheric ozone depletion.
    Print ISSN: 0894-8755
    Electronic ISSN: 1520-0442
    Topics: Geography , Geosciences , Physics
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  • 10
    Publication Date: 2012-12-15
    Description: How Great Plains climate will respond under global warming continues to be a key unresolved question. There has been, for instance, considerable speculation that the Great Plains is embarking upon a period of increasing drought frequency and intensity that will lead to a semipermanent Dust Bowl in the coming decades. This view draws on a single line of inference of how climate change may affect surface water balance based on sensitivity of the Palmer drought severity index (PDSI). A different view foresees a more modest climate change impact on Great Plains surface moisture balances. This draws on direct lines of analysis using land surface models to predict runoff and soil moisture, the results of which do not reveal an ominous fate for the Great Plains. The authors’ study presents a parallel diagnosis of projected changes in drought as inferred from PDSI and soil moisture indicators in order to understand causes for such a disparity and to shed light on the uncertainties. PDSI is shown to be an excellent proxy indicator for Great Plains soil moisture in the twentieth century; however, its suitability breaks down in the twenty-first century, with the PDSI severely overstating surface water imbalances and implied agricultural stresses. Several lines of evidence and physical considerations indicate that simplifying assumptions regarding temperature effects on water balances, especially concerning evapotranspiration in Palmer’s formulation, compromise its suitability as drought indicator in a warming climate. The authors conclude that projections of acute and chronic PDSI decline in the twenty-first century are likely an exaggerated indicator for future Great Plains drought severity.
    Print ISSN: 0894-8755
    Electronic ISSN: 1520-0442
    Topics: Geography , Geosciences , Physics
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