Biogeography of lodgepole pine

1982 ◽  
Vol 60 (9) ◽  
pp. 1805-1814 ◽  
Author(s):  
Nicholas C. Wheeler ◽  
Raymond P. Guries
Keyword(s):  
North Pacific ◽  
Pacific Coast ◽  
Lodgepole Pine ◽  
Western United States ◽  
Western North America ◽  
The West ◽  
Glacial Retreat ◽  
The North ◽  
The North Pacific ◽  
Glacial Advance

Lodgepole pine has been a component of the western North America flora throughout recent geological history although its present widespread distribution may be a relatively recent phenomenon (Late Pleistocene). The differentiation of populations within and between subspecies, and the distribution of rare alleles, both suggest that at the time of maximal Wisconsin glacial advance lodgepole pine was restricted to a number of refugia in the western United States, the islands along the north Pacific coast, and in an unglaciated region of the west-central Yukon. Subsequent to glacial retreat, lodgepole pine migrated to its present range with northern and southern interior populations meeting in northern British Columbia, possibly within the last 4000 years.

Notes on Birds Observed at Sea off the North Pacific Coast

The Murrelet ◽  
1933 ◽  
Vol 14 (1) ◽  
pp. 7
Author(s):  
J. E. Guberlet ◽  
R. C. Miller
Keyword(s):  
North Pacific ◽  
Pacific Coast ◽  
The North ◽  
The North Pacific

scholarly journals California Central Valley Summer Heat Waves Form Two Ways*

2016 ◽  
Vol 29 (3) ◽  
pp. 1201-1217 ◽  
Author(s):  
Yun-Young Lee ◽  
Richard Grotjahn
Keyword(s):  
North Pacific ◽  
Heat Waves ◽  
Central Valley ◽  
Maximum Temperature ◽  
Northern California ◽  
Long Distance ◽  
The West ◽  
California Coast ◽  
The North ◽  
The North Pacific

Abstract California Central Valley (CCV) heat waves are grouped into two types based on the temporal and spatial evolution of the large-scale meteorological patterns (LSMPs) prior to onset. The k-means clustering of key features in the anomalous temperature and zonal wind identifies the two groups. Composite analyses show different evolution prior to developing a similar ridge–trough–ridge pattern spanning the North Pacific at the onset of CCV hot spells. Backward trajectories show adiabatic heating of air enhanced by anomalous sinking plus horizontal advection as the main mechanisms to create hot lower-tropospheric air just off the Northern California coast, although the paths differ between clusters. The first cluster develops the ridge at the west coast on the day before onset, consistent with wave activity flux traveling across the North Pacific. Air parcels that arrive at the maximum temperature anomaly (just off the Northern California coast) tend to travel a long distance across the Pacific from the west. The second cluster has the ridge in place for several days prior to extreme CCV heat, but this ridge is located farther north, with heat anomaly over the northwestern United States. This ridge expands south as air parcels at midtropospheric levels descend from the northwest while lower-level parcels over land tend to bring hot air from directions ranging from the hot area to the northeast to the desert areas to the southeast. These two types reveal unexpected dynamical complexity, hint at different remote associations, and expand the assessment needed of climate models’ simulations of these heat waves.

scholarly journals Downstream Development of the Summertime Tropical Cyclone/Submonthly Wave Pattern in the Extratropical North Pacific

2010 ◽  
Vol 23 (8) ◽  
pp. 2223-2229 ◽  
Author(s):  
Ken-Chung Ko ◽  
Huang-Hsiung Hsu
Keyword(s):  
Tropical Cyclone ◽  
North Pacific ◽  
Western North Pacific ◽  
Wave Pattern ◽  
Wave Activity ◽  
Western North America ◽  
Energy Propagation ◽  
The North ◽  
The Impact ◽  
The North Pacific

Abstract The impact of tropical perturbation on the extratropical wave activity in the North Pacific in the submonthly time scale is demonstrated here. Previous studies identified a tropical cyclone (TC)/submonthly wave pattern, which propagated north-northwestward in the Philippine Sea and recurved in the oceanic region between Japan and Taiwan. This study found that, after the arrival of the TC/submonthly wave pattern at the recurving region, the eastward-propagating wave activity in the extratropical North Pacific was significantly enhanced. It is suggested that the TC/submonthly wave pattern, which is originated in the tropical western North Pacific, enhances the eastward energy propagation of Rossby wave–like perturbation in the extratropical North Pacific and may have an impact on the long-range weather predictability in the eastern North Pacific and western North America.

Sign in / Sign up

Export Citation Format

Share Document