Semi-arid regions of the boreal zone as demonstrated in the Yukon Basin

Jätzold, Ralph

doi:10.3112/erdkunde.2000.01.01

Cited by 11 publications

(11 citation statements)

References 13 publications

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“…Similar moisture deficits were also associated with the Yukon-Charley Rivers National Preserve and the Tanana River Valley in central Alaska (see Fig. 2 in Jätzold, 2000).…”

Section: High-latitude Boreal Grasslandssupporting

confidence: 63%

“…The lee position creates a regional rain shadow, but lower elevations allow greater potential for adiabatic warming than at higher elevations; hence, there is a greater potential for evaporation. The effect of these circumstances was represented in a regional potential evaporation analysis conducted by Jätzold (2000), who found that a severe April -June moisture deficit occurred in and around the Yukon River Valley and the lower reaches of its main tributaries. Jätzold (2000) estimated that precipitation compensated for less than 25% of the potential early summer climatic moisture deficit, although this percentage varies with slope orientation and steepness.…”

Section: High-latitude Boreal Grasslandsmentioning

confidence: 99%

“…The effect of these circumstances was represented in a regional potential evaporation analysis conducted by Jätzold (2000), who found that a severe April -June moisture deficit occurred in and around the Yukon River Valley and the lower reaches of its main tributaries. Jätzold (2000) estimated that precipitation compensated for less than 25% of the potential early summer climatic moisture deficit, although this percentage varies with slope orientation and steepness. He equated the severity of deficits on steep south-southwest slopes to that of semi-desert environments in low latitudes.…”

Section: High-latitude Boreal Grasslandsmentioning

confidence: 99%

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High-Latitude Yukon Boreal-Cordilleran Grassland Plant Communities

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2015

ARCTIC

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ABSTRACT. .8˚ N) graminoid plant communities located near the northern limit of boreal forest occurrence in the Carmacks -Pelly Crossing area of Yukon were sampled and classified, and four sociations were recognized: Calamagrostis purpurascens (purple reedgrass), Hesperostipa comata (needle-and-thread grass), Poa glauca -Artemisia frigida (glaucous bluegrass -pasture sagewort), and Pseudoroegneria spicata -Artemisia frigida (bluebunch wheatgrass -pasture sagewort). These plant communities occurred primarily on south-southwest slopes (180˚ -230˚) with 45% -75% gradients. Relative to southern Canada mixedgrass prairie, Yukon grasslands were likely species poor, had less total canopy cover, and produced less than half as much aboveground herb biomass (typically 200 -300 kg/ha). The distribution of the sociations appeared limited to ~60˚ -65˚ N latitude in the Yukon-Alaska region. Calamagrostis was the most abundant and widespread grassland sociation in the study area. The four sociations occupied less than 4% of the Carmacks -Pelly Crossing landscape, although they represented the most extensive high-latitude boreal grassland vegetation in Canada (≥ 2600 ha) and they were among the most northerly in North America.

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“…Similar moisture deficits were also associated with the Yukon-Charley Rivers National Preserve and the Tanana River Valley in central Alaska (see Fig. 2 in Jätzold, 2000).…”

Section: High-latitude Boreal Grasslandssupporting

confidence: 63%

Section: High-latitude Boreal Grasslandsmentioning

confidence: 99%

Section: High-latitude Boreal Grasslandsmentioning

confidence: 99%

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High-Latitude Yukon Boreal-Cordilleran Grassland Plant Communities

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2015

ARCTIC

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“…April is the driest month (Table 1). Regionally, the Takhini Valley is semi-arid (Jätzold, 2000) because it occurs in the rain shadow of the St. Elias Mountains. Regression analysis indicates that between 1943 and 2013, summer and annual temperatures had modest but significant (p < 0.05) patterns of temporal change ( Fig.…”

Section: Study Areamentioning

confidence: 99%

“…From an ecological perspective, continued warming will eventually allow an increase in the abundance of trembling aspen and lodgepole pine in areas where they currently exist and facilitate the western expansion of both species up the Takhini Valley. An increase of more than 10% in total annual precipitation by AD 2100 (IPCC, 2013) coupled with an even greater warming would increase general climatic aridity in an already semi-arid environment (Jätzold, 2000). To approximate the status quo, at least a 9% increase in precipitation would be required to compensate for each 1˚C increase in temperature, according to the Wang et al (2006) annual heat-moisture index.…”

Section: St Century Climate Warmingmentioning

confidence: 99%

Episodic and Systematic Tree Ring-Width Variation (AD 1763–2013) in the Takhini Valley, Southwest Yukon, Canada

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2017

ARCTIC

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A tree-ring analysis of 764 western white spruce (Picea albertiana) in the Takhini Valley of southwest Yukon was conducted to assess short- and long-term variation in growth and local climate. The resulting chronology spanned the period from AD 1763 to 2013. A polynomial regression (R = 0.720, p < 0.001) indicated that the pre-1840 segment of the chronology had below-normal tree ring-width index (RWI) values (average 0.64, with modest variation), but the subsequent segment had greater variation and a steady increase in RWI values (average 0.89) until ~1920. After 1930, RWI values began to increase again (average 1.06) with 51% more variation than had previously occurred. Peak RWI values after 1930 were double those of the early 1800s. RWI values were uncorrelated with air temperature variables (except September minima), but weakly and positively correlated (r < 0.35) with precipitation variables. RWI values were moderately correlated with annual heat-moisture index values (r = −0.415, p < 0.001), although more strongly with RWI values less than 1.1 (R = −0.631, p < 0.001). Therefore, the RWI chronology was interpreted from an ecological moisture-balance perspective, with possible long-term temperature changes estimated from archival sources. The latter suggested a 2.1˚ – 3.1˚C rise since the early 1800s. Extreme RWI values and portions of the chronology were associated with known environmental events.

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Picea (spruce) growth rate (mm year−1) changes in southwest Yukon (Canada) since the mid 19th century

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2019

Veget Hist Archaeobot

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Semi-arid regions of the boreal zone as demonstrated in the Yukon Basin

Cited by 11 publications

References 13 publications

High-Latitude Yukon Boreal-Cordilleran Grassland Plant Communities

High-Latitude Yukon Boreal-Cordilleran Grassland Plant Communities

Episodic and Systematic Tree Ring-Width Variation (AD 1763–2013) in the Takhini Valley, Southwest Yukon, Canada

Picea (spruce) growth rate (mm year−1) changes in southwest Yukon (Canada) since the mid 19th century

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