Distribution – Northern Hemisphere

• Laurentian type of climate is found only in two regions.
• Only in the northern hemisphere.

Distribution – Not in Southern Hemisphere

• Only a small section of continents extends south of 40°S latitude.
• These small sections come under the rain-shadow region of Andes (Patagonia) – leading to aridity and also Westerlies hardly ever reach these regions.
• In other regions, the oceanic influence is very profound.

Natural Vegetation

• Forest tend to be coniferous north of the 50°N latitude.
• South of 50 degree latitude the coniferous give way to deciduous forest .

Economic Development

• Lumbering – timber, paper and pulp industries.
• Fishing is, however, the most outstanding economic activity.

Westerlies

Rainfall – The North American region

• Precipitation occurs all-round the year due to the influence of Atlantic ocean (summer) and the Great Lakes (winter).
• Westerlies carry moisture from Great Lakes causing wet conditions in winter.
• Warm Gulf Stream increases the moisture of easterly winds.
• Convergence of the warm Gulf Stream and the cold Labrador Current near Newfoundland rise to much precipitation.

Great Lakes

Rainfall – The Asiatic region

• Rainfall regime resembles the tropical monsoon type in India.
• Intense heating of the mountainous interior of China in summer creates a region of extreme low pressure, and moisture-laden winds from the Pacific Ocean and the Sea of Japan blow in as the South-East Monsoon.
• Rainfall distribution of the Asiatic region is far less uniform when compared to North American Region.
• The warm Kuroshio makes the climate of Japan less extreme.
• The climate of Japan is modified by the meeting of warm and cold ocean currents.
• It receives adequate rainfall from both the South-East Monsoon in summer and the North-West Monsoon(Sea of Japan) in winter.

Temperature  – The Asiatic region

• Winters are cold and very dry while summers are very warm and exceptionally wet.

Note – Much of the winter precipitation in northern China, Korea and Hokkaido, Japan, is in the form of snow.

Polar Easterlies

Ocean Currents

 

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