Tundra and Arctic Regions of the World

Table of Contents

1. Introduction: Defining the Tundra Biome 2. Arctic Tundra Geography: Distribution Across the Northern World 3. The Arctic Ocean and North Pole 4. Permafrost: The Frozen Foundation Beneath the Tundra 5. Arctic Flora: Plants of the Treeless Plains 6. Arctic Fauna: Land and Tundra Mammals 7. Marine Mammals of the Arctic 8. Migratory Birds of the Arctic Tundra 9. Alpine Tundra: High-Altitude Deserts of the World 10. Antarctic and Sub-Antarctic Tundra 11. Indigenous Peoples of the Arctic 12. Arctic Exploration History 13. Natural Resources of the Arctic 14. Climate Change and the Arctic Crisis 15. Arctic Governance and Territorial Claims 16. Accuracy Audit 17. Sources

Introduction: Defining the Tundra Biome

The tundra is among the most elemental of the Earth's great biomes — a landscape stripped to essentials, where cold governs all, where the soil itself is locked in perpetual frost, and where life clings to existence with extraordinary tenacity. It is a place of extremes: extreme cold, extreme seasonal light, extreme brevity of the growing season, and extreme vulnerability to the shifts that are now reshaping the planet's climate system. To understand the tundra is to understand one of the most critical and least-appreciated regulatory systems on Earth, a biome that stores more carbon than the world's forests and whose fate will shape global temperatures for centuries to come.

The word "tundra" derives from the Finnish word "tunturi," meaning a treeless plain or barren hill. The term entered scientific usage through Russian explorers and naturalists who encountered the vast, open plains stretching across northern Siberia, where no trees grew and the land lay open to sky and wind in a way that seemed both desolate and profoundly alive. In scientific classification, the tundra is defined primarily by its climate: it is too cold and dry for trees to grow, it is underlain by permafrost — permanently frozen ground — and it experiences a growing season of fewer than sixty days per year. These conditions produce a characteristic landscape of low-growing shrubs, sedges, mosses, lichens, and flowering plants adapted to survive under some of the most demanding conditions on Earth.

Ecologists recognize three distinct types of tundra, each shaped by different geographic and climatic factors. Arctic tundra is the most extensive, encircling the North Pole in a broad band across the northernmost reaches of North America, Europe, and Asia. It is bounded on its northern edge by the Arctic Ocean and polar ice and on its southern edge by the boreal forest, or taiga — the transition zone where the last, struggling trees give way to open, treeless ground. This transitional zone is called the treeline, and it has served as one of the most reliable indicators of climate change: in many parts of the world, the treeline is creeping northward and upward in elevation as temperatures warm, an unmistakable sign that the boundaries of the tundra are shifting in response to human-caused global warming.

Alpine tundra is found not at high latitudes but at high altitudes, on mountain peaks and plateaus above the treeline throughout the world. Alpine tundra exists in the Tibetan Plateau, the Rocky Mountains, the Andes, the Alps, the Pyrenees, the Ethiopian Highlands, and the mountains of Central Asia. It shares many characteristics with Arctic tundra — low temperatures, thin soils, short growing seasons, and dwarf vegetation — but differs in that it is generally better drained, experiences greater solar radiation at altitude, and is not underlain by continuous permafrost in the way that Arctic tundra is. Alpine tundra also has no polar night; it experiences normal day-night cycles even in the coldest months.