Filters: Tags: P2-Changes in Plant and Animal Species Due to Climate Change (X) > Types: Map Service (X)
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Tags: P2-Changes in Plant and Animal Species Due to Climate Change
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Tags: P2-Changes in Plant and Animal Species Due to Climate Change
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Tags: Monitoring 5-Physical Science,
P2-Changes in Plant and Animal Species Due to Climate Change
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Tags: P2-Changes in Plant and Animal Species Due to Climate Change
Pattern and extent of treeline change using sequential vertical aerial photography in the northern section of the Kluane Ranges of southwest Yukon are examined. One of the most common predictions is that continued global temperature increases will cause the tree-line to advance in elevation and latitude. Comparison of aerial photographs of southwest Yukon indicates significant changes in the spruce forest-shrub tundra transition. Many areas exhibit increased growth of individual spruce without an increase in stand density or an advance in spruce distribution. Increase in the elevational distribution of spruce is observed in comparatively fewer areas, typically in combination with other two types of change.
Experiments have been conducted with a regional climate model to indicate the conditions required to generate preferred regions of frontal activity in the Alaskan region. Several objective methods of frontal identification were first investigated. It was found that· the vertical component of relative vorticity,· a thermal front parameter -&nablaB;|&nablaB;Tsub 850] | · n, where Tsub 850] is the 850-hPa temperature and n is a unit vector in the direction of the 850-hPa temperature gradient, and· a parameter derived from the Q vector as a measure of vertical motionwere useful in combination to determine the occurrence of fronts. The preferred locations for frontal activity were located to the southern side of the...
A selective review of lichenometry as used to date Holocenemoraines in five diverse regions of Alaska and in southeastern Kamchatka suggests that growth curves for this North Pacific areamay be improved by attention to several factors. These includedlichen identification, control point number and distribution,radiocarbon calibration, alternative curve models, andcompatibility of lichen growth rate with climate. Support forcontrol points presented for Kamchatka and published for Alaska areas will benefit from supplementary control at and beyond thebreak from the great growth curve segments of the last centuries.With regard to alternative-linear, logarithmic, and compositecurve-models drawn for the published lichenometric...
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Tags: P2-Changes in Plant and Animal Species Due to Climate Change
Recent studies have shown that ice duration in lakes and rivers over the Northern Hemisphere has decreased over the 19th and 20th centuries in response to global warming. However, lake ice trends have not been well documented in Canada. Because of its size, considerable variability may exist in both freeze-up and break-up dates across the country. In this paper, results of the analysis of recent trends (1951-2000) in freeze-up and break-up dates across Canada are presented. Trends toward earlier break-up dates are observed for most lakes during the time periods of analysis which encompass the 1990s. Freeze-up dates, on the other hand, show few significant trends and a low degree of temporal coherence when compared...
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Tags: P2-Changes in Plant and Animal Species Due to Climate Change
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Tags: P2-Changes in Plant and Animal Species Due to Climate Change
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Tags: A1-Forestry,
P2-Changes in Plant and Animal Species Due to Climate Change
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Tags: P2-Changes in Plant and Animal Species Due to Climate Change,
Paleo and Holocene
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Tags: P2-Changes in Plant and Animal Species Due to Climate Change
High-latitude northern ecosystems are experiencing rapid climate changes, and represent a large potential climate feedback because of their high soil carbon densities and shifting disturbance regimes. A significant carbon flow from these ecosystems is soil respiration (RS, the flow of carbon dioxide, generated by plant roots and soil fauna, from the soil surface to atmosphere), and any change in the high-latitude carbon cycle might thus be reflected in RS observed in the field. This study used two variants of a machine-learning algorithm and least squares regression to examine how remotely-sensed canopy greenness (NDVI), climate, and other variables are coupled to annual RS based on 105 observations from 64 circumpolar...
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