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  • 2020-2022  (2)
  • 1995-1999  (2)
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  • 1
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    Modeling North Pacific temperature and pressure changes from coastal tree-ring chronologies (2021)
    In:  http://aquaticcommons.org/id/eprint/15747 | 8 | 2014-11-25 22:22:18 | 15747
    Details
    Publication Date: 2021-07-10
    Description: Climate modeling using coastal tree-ring chronologies has yielded the first summer temperature reconstructions for coastal stations along the Gulf of Alaska and the Pacific Northwest. These land temperature reconstructions are strongly correlated with nearby sea surface temperatures, indicating large-scale ocean-atmospheric influences. Significant progress has also been made in modeling winter land temperatures and sea surface temperatures from coastal and shipboard stations. In addition to temperature, the pressure variability center over the central North Pacific Ocean (PAC), which is related to the strength and location of the Aleutian Low pressure system, could be extended using coastal tree rings.
    Keywords: Atmospheric Sciences ; Oceanography ; PACLIM ; dendrochronology
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 67-78
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    PAPER (OA)
  • 2
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    Tree-ring records as indicators of air-sea interaction in the northeast Pacific sector (2021)
    In:  http://aquaticcommons.org/id/eprint/15629 | 8 | 2014-11-13 19:41:53 | 15629
    Details
    Publication Date: 2021-07-09
    Description: Climate conditions in land areas of the Pacific Northwest are strongly influenced by atmosphere/ocean variability, including fluctuations in the Aleutian Low, Pacific-North American (PNA) atmospheric circulation modes, and the El Niño-Southern Oscillation (ENSO). It thus seems likely that climatically sensitive tree-ring data from these coastal land areas would likewise reflect such climatic parameters. In this paper, tree-ring width and maximum lakewood density chronologies from northwestern Washington State and near Vancouver Island, British Columbia, are compared to surface air temperature and precipitation from nearby coastal and near-coastal land stations and to monthly sea surface temperature (SST) and sea level pressure (SLP) data from the northeast Pacific sector. Results show much promise for eventual reconstruction of these parameters, potentially extending available instrumental records for the northeastern Pacific by several hundred years or more.
    Keywords: Atmospheric Sciences ; Environment ; Oceanography ; PACLIM ; dendrochronology
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 35-45
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    PAPER (OA)
  • 3
    Electronic Resource
    Electronic Resource
    Northern Hemisphere Temperature Variability for the Past Three Centuries: Tree-Ring and Model Estimates (1999)
    Springer
    Climatic change 42 (1999), S. 663-675 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We compare Northern Hemisphere energy-balance-model temperature calculations to an annual temperature reconstruction based on 20 tree-ring width records from latitudinal and elevational treeline sites in northern North America, Scandinavia, Siberia and Mongolia for the past three centuries. The energy-balance model uses three primary forcings; solar, volcanic, and anthropogenic trace gas and aerosol variations. Several different parameterizations of the forcings are compared. The best agreement (r = 0.8) is found when the annual reconstruction is compared to a version of the model using (1) the Dust Veil Index of Lamb, (2) a solar parameterization which includes the length of the solar cycle, and (3) anthropogenic forcing. The implication is that all three forcings are important in explaining the temperature variations. The general similarity in low-frequency trends between the two independently-derived time series supports the validity of both the model estimates and the tree-ring reconstruction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005471918574
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Northern North American Tree-Ring Evidence for Regional Temperature Changes after Major Volcanic Events (1999)
    Springer
    Climatic change 41 (1999), S. 1-15 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Maximum latewood density data from trees at thirteen temperature-sensitive sites along the northern treeline of North America are used to evaluate the spatial patterns of response to four known volcanic events just prior to the period of modern observations: in 1640, 1783, 1815 and 1835. A previously unknown event is also postulated for 1699. This tree-ring density parameter is used because it shows a stronger and more consistent short-term, temperature-related volcanic signal than ring width. Normalized density departures following these events vary in sign and magnitude from region to region, with the coldest summer conditions inferred for the Northwest Territories in 1641, Alaska in 1783, Quebec and Labrador in 1816 and the Northwest Territories in 1836. For these as well as other events, low density values are often among the most extreme on record at their respective locations. We suggest that these regional variations in tree growth reflect cooling induced by volcanism and the distribution of cooling influenced by atmospheric circulation patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005370210796
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    Paper (German National Licenses)
    Fulltext
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