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Hudson's Bay might have something to do with the lower (farther south) tree line
in eastern Canada.
North western Canada has a much higher (farther north) tree line,
as far north as about 68 degees north in the MacKenzie Delta area near Inuvik,NWT
Russia (Siberia) "benefits" from a larger land mass which helps create a more
extreme continental climate situation than similiar latitudes in north america.
Western Canada north has climates closer to Russian counterparts in Siberia,
MacKenzie Valley in NWT and and parts of Yukon Territory have warmer summers than
farther east, average July high temps in the low 70's F and very cold winter temperatures
in places like Old Crow, Yukon...Dawson City, Yukon.....Norman Wells,NWT ...Inuvik,NWT
Fort Simpson,NWT....even Tuktoyaktuk, NWT near the Arctic Ocean at almost 70 degrees north
has a relatively warm summer, significantly warmer than Barrow, Alaska and Iqaluit, Nunavut
and Iqaluit is much farther south!
My understanding is that the mean temperature of the warmest month has to average
over 50F (10c) in order for trees to grow. The tree line is usually corresponds very closely to the 50F mean isotherm.
Interestingly the "tree line" in the Canadian Rockies in Banff, Alberta area is around
the 7,500 ft (2300m) elevation , on the west coast it is generally much lower,
BC's coast mountains it's about5,000 ft (1700m) ....and as owenc pointed out,
in northern Ireland (and Scotland) the tree line is much lower.
In Colorado the tree line is much higher at about 11,500 ft (3300 m).
That would explain why The Faroe islands have very little trees as the isotherm just about touches there. Interestingly the warmest month here has a mean of 14c here so not too far off. Looking at Whitehorse the mean is the exact same temperature. This really proves your point.
The reason Coastal BC's mountains have a lower tree line is because of the Pacific moderating daily highs in the summer but also making the winter's milder than continental mountainous climates.
Hudson's Bay might have something to do with the lower (farther south) tree line
in eastern Canada.
Interestingly the "tree line" in the Canadian Rockies in Banff, Alberta area is around
the 7,500 ft (2300m) elevation , on the west coast it is generally much lower,
BC's coast mountains it's about5,000 ft (1700m) ....and as owenc pointed out,
in northern Ireland (and Scotland) the tree line is much lower.
In Colorado the tree line is much higher at about 11,500 ft (3300 m).
Northern New England the treeline is 4000-4500 feet. Newfounland around 2000 feet.
Northern New England the treeline is 4000-4500 feet. Newfounland around 2000 feet.
When hiking in New Hampshire's White Mountains I noticed that some the
higher peaks are above the tree line, like Mt. Lafayette, even Mt. Moosilauke,
which is only just over 4,800 ft. Really good hiking around Franconia Notch
The most northerly true sub-tropical climate must surely be the Azores?
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