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A very productive rain-fed forest occurs along the British Columbia coast from Haida Gwaii and Stewart south to Metchosin on Vancouver Island. [15] It also extends inland along river valleys from coastal parts of Alaska, crossing into British Columbia as far north as the Chilkat River. [16] Western hemlock is a dominant climax species throughout.
Biogeoclimatic ecosystem classification (BEC) [1] [2] is an ecological classification framework used in British Columbia to define, describe, and map ecosystem-based units at various scales, from broad, ecologically-based climatic regions down to local ecosystems or sites.
The five main latitude regions of Earth's surface comprise geographical zones, [1] divided by the major circles of latitude. The differences between them relate to climate. They are as follows: The North Frigid Zone, between the North Pole at 90° N and the Arctic Circle at 66°33′50.3″ N, covers 4.12% of Earth's surface.
The humid subtropical zone of the US South according to Trewartha is coloured yellow-green on this map: If using the Köppen climate classification with the 0 °C coldest-month isotherm, the subtropics extend from Martha's Vineyard, extreme SW Rhode Island, and most of Long Island to central Florida in the eastern states, include the southern ...
The climate and ecology of different locations on the globe naturally separate into life zones, depending on elevation, latitude, and location. The generally strong dependency on elevation is known as altitudinal zonation: the average temperature of a location decreases as the elevation increases.
The differences in climate from south to north create several major forest zones, characterized by different species. At the southern limit in northern California is the "coast redwood zone". Beginning at the California/Oregon border, and extending through the north end of Vancouver Island is the "seasonal rain forest zone".
All of these cold deserts experience about 100–300 mm of precipitation in a year indicating a semi-arid climate. The warm deserts of North America include The Mojave Basin and Range, the Sonoran desert, and the Chihuahuan desert. These areas have a tropical desert climate, and are known as the hottest and driest place on the continent.
Dfb climates are immediately poleward of hot summer continental climates, generally in the high 40s and low 50s latitudes in North America and Asia, and also extending to higher latitudes into the high 50s and low 60s latitudes in central and eastern Europe, between the maritime temperate and continental subarctic climates. [10]