Why Is Iceland Green and Greenland Icy? Climate, Currents & Viking Marketing

Iceland is greener than its name suggests because the warm North Atlantic Current (an extension of the Gulf Stream) moderates its climate significantly, keeping coastal temperatures above freezing even in winter despite the island's position just below the Arctic Circle. Greenland, despite its promising name, is approximately 80 percent covered by the second-largest ice sheet on Earth, with average temperatures well below freezing.

Introduction

The apparent paradox of these names has a fascinating historical explanation. Viking explorers in the 9th and 10th centuries named these islands, and historical accounts suggest the names were partly strategic: Erik the Red reportedly called the icy island "Greenland" to attract settlers, while Iceland got its name from a disgruntled early visitor who spotted ice in a fjord.

The Short Answer

• Iceland Climate: Warmed by North Atlantic Current, relatively mild for its latitude
• Greenland Ice: 80% covered by an ice sheet up to 3 km thick
• Name Origin: Viking-era naming, possibly strategic or circumstantial

Iceland sits astride the Mid-Atlantic Ridge where the North American and Eurasian plates diverge, and it benefits enormously from the North Atlantic Current. Reykjavik's average January temperature is about -0.5°C, similar to New York City despite being 2,000 km further north. The warm current keeps Iceland's coastlines ice-free year-round and supports lush grass growth in summer.

Greenland, the world's largest island at 2.16 million km², is overwhelmingly dominated by its ice sheet, which averages 2.1 km in thickness and contains enough ice to raise global sea levels by about 7 meters if fully melted. Only a narrow coastal strip, mainly along the southwest coast, is ice-free and habitable, supporting a population of about 56,000.

The Science Behind It

• Gulf Stream Effect: Makes Iceland 10-15°C warmer than expected for 65°N latitude
• Greenland Ice Sheet: 2.85 million km³ of ice, formed over millions of years
• Geothermal Activity: Iceland has abundant geothermal energy from volcanic activity
• Albedo Effect: Greenland's ice reflects sunlight, keeping it cold (positive feedback)

The North Atlantic Current carries warm water from the tropics northward past Iceland. This oceanic heat transfer is so significant that it makes Western Iceland about 10-15°C warmer than other locations at the same latitude in Canada or Siberia. Combined with Iceland's geothermal activity (the island sits on a volcanic hotspot), Iceland has a surprisingly habitable climate.

Greenland's ice sheet creates its own climate through the albedo effect. The white ice reflects up to 80 percent of incoming solar radiation back into space, keeping the surface cold and preventing melting. The ice sheet also creates its own high-pressure weather system, generating cold, dry katabatic winds that flow off the ice cap. This self-reinforcing cold makes the ice sheet remarkably stable, though it is now losing mass at an accelerating rate due to climate change.

Types & Variations

• Iceland's Landscape: Glaciers cover ~11%, but green valleys, geysers, and hot springs
• Greenland's Coast: Ice-free coastal strip with tundra, fjords, and small towns
• Climate Zones: Iceland: maritime subarctic; Greenland: polar ice cap and tundra
• Vegetation: Iceland: grass and moss; Greenland: Arctic tundra plants along coast

Iceland is not uniformly green. About 11 percent of the island is covered by glaciers, including Vatnajokull, Europe's largest glacier by volume. The interior highlands are a barren volcanic desert. However, the lowland coastal areas support surprisingly lush grass growth in summer, earning the country its paradoxically inaccurate reputation.

Greenland's ice-free coastal strip, particularly around the southwestern towns of Nuuk and Narsarsuaq, does support green vegetation in summer. The Vikings established farms in these areas around 985 AD, and the Norse settlements lasted roughly 500 years before being abandoned during the Little Ice Age. Modern Greenlandic agriculture, including sheep farming, continues in these same areas.

Famous Examples

• Erik the Red: Exiled Viking who named Greenland to attract settlers (~985 AD)
• Floki Vilgerdarson: Norse explorer who named Iceland after spotting ice (~868 AD)
• Viking Settlements: Norse farms in Greenland lasted ~500 years before abandonment
• Climate Change: Greenland is losing ~280 billion tons of ice per year

According to the Icelandic sagas, Erik the Red was exiled from Iceland for manslaughter and sailed west, discovering a large island. He explored its southwestern coast during a relatively warm period and named it "Greenland" because, as the saga states, "people would be more eager to go there if the land had a good name." Whether this was deliberate marketing or genuine description of the green coast he saw, the name has puzzled people ever since.

Floki Vilgerdarson, one of the first Norse visitors to Iceland, reportedly climbed a mountain and spotted a fjord full of sea ice. He named the island "Iceland" in frustration, though other early visitors called it "Snowland" and "Butterland" (for the rich grass). The negative name did not prevent Norse settlement; Iceland was colonized extensively from the 870s onward.

Why It Matters

• Climate Change: Greenland's ice loss is a major contributor to sea level rise
• Ocean Currents: If the Gulf Stream weakens, Iceland could become much colder
• Geopolitics: Greenland's melting ice is opening new shipping routes and resource access

Greenland's ice sheet is now losing mass at an accelerating rate, about 280 billion tons per year, making it the single largest contributor to sea level rise. This meltwater also threatens to disrupt the Atlantic thermohaline circulation by reducing the salinity and density of North Atlantic water. If this circulation slows significantly, the Gulf Stream that keeps Iceland (and Europe) warm could weaken, potentially making Iceland live up to its name.

Greenland has become a focus of geopolitical interest as climate change melts its ice. Previously inaccessible mineral deposits, including rare earth elements critical for modern technology, are becoming exposed. The possibility of new Arctic shipping routes and resource extraction has attracted attention from major powers, making this sparsely populated island a significant player in 21st-century geopolitics.

Key Facts

• Iceland is warmed 10-15°C above expected temperatures for its latitude by the North Atlantic Current.
• Greenland's ice sheet covers 80% of the island and is up to 3 km thick.
• Erik the Red named Greenland around 985 AD, reportedly to attract settlers.
• Greenland's ice contains enough water to raise global sea levels by about 7 meters.
• Iceland has about 130 volcanoes, 30 of which are active, providing geothermal energy.

Fun Facts

• Reykjavik, Iceland has a milder winter average temperature (-0.5°C) than New York City, despite being 2,000 km further north.
• Greenland's ice sheet is so heavy it has depressed the bedrock beneath it below sea level.
• Iceland heats 90% of its buildings with geothermal energy from volcanic activity.
• If Greenland's ice sheet melted completely, the island beneath would gradually rise by up to 800 meters as it rebounded from the weight.

Final Thoughts

The names of Iceland and Greenland are one of geography's great ironies, but the explanation lies in ocean currents, geological activity, and Viking-era naming practices. Iceland's relative warmth is a gift of the Gulf Stream, while Greenland's icy mantle is a self-reinforcing climate system millions of years old. As climate change warms the Arctic, these two islands are at the forefront of planetary change: Greenland's melting ice threatens global sea levels, while the ocean currents that keep Iceland green may themselves be at risk.