Arctic - Wikipedia
Another definition of the Arctic, which is popular with ecologists, is the region in the Northern Hemisphere where the average temperature for the warmest month (July) is below 10 °C (50 °F); the northernmost tree line roughly follows the isotherm at the boundary of this region.
Arctic tundra becoming a source of carbon dioxide emissions, …
10 小时之前 · The Arctic tundra has historically helped reduce global emissions. But rising temperatures and wildfires in the region are changing that, scientists say.
Arctic | Definition, Climate, People, & Facts | Britannica
3 天之前 · Arctic, northernmost region of Earth, centered on the North Pole and characterized by distinctively polar conditions of climate, plant and animal life, and other physical features. The term is derived from the Greek word arktos (‘bear’), referring to …
Report Card 2024 - NOAA Arctic
16 小时之前 · Arctic Ocean regions that are ice-free in August have been warming at a rate of 0.5°F (0.3°C) per decade since 1982. In most of the shallow seas that ring the Arctic Ocean, August mean sea surface temperatures were 3.6-7.2°F (2-4°C) warmer than 1991-2020 averages, though the Chukchi Sea was 1.8-7.2°F (1-4°C) cooler than average. ...
Arctic Tundra Has Long Helped Cool Earth. Now, It’s Fueling …
12 小时之前 · It’s one of many signs of rapid change in the National Oceanic and Atmospheric Administration’s Arctic Report Card, the agency’s yearly checkup on the polar region. The 2024 report card was ...
Arctic - Education | National Geographic Society
2023年10月19日 · The Arctic is the northernmost region of Earth. Most scientists define the Arctic as the area within the Arctic Circle , a line of latitude about 66.5° north of the Equator . Within this circle are the Arctic ocean basin and the northern parts of Scandinavia , Russia, Canada, Greenland, and the U.S. state of Alaska.
Arctic - Polar, Tundra, Climate | Britannica
6 天之前 · Arctic - Polar, Tundra, Climate: The climates of polar lands vary greatly depending on their latitude, proximity of the sea, elevation, and topography, but, even so, they all share certain “polar” characteristics.
Where is the Arctic? What is its Boundary? - Geology.com
The Arctic is the polar region of Earth that surrounds the North Pole. It includes the Arctic Ocean , numerous islands, and the northernmost portions of several countries. These include: Canada , Finland , Greenland , Norway , Russia , Sweden , and the United States .
The Arctic Map: Regions, Geography, Facts & Figures
The Arctic region, also known as the Arctic Circle, is a vast and unique area that is located in the northernmost part of the Earth. It is a polar zone that covers a wide range of landmasses, including parts of Canada, Russia, Greenland, Norway, and the United States.
Arctic - Simple English Wikipedia, the free encyclopedia
The red line shows the Arctic region border. The Arctic is the area around the Earth's North Pole. It includes parts of Russia, Alaska, Canada, Greenland, Iceland, Lapland, and Svalbard. It is an ocean, mostly covered with ice. The word 'Arctic' comes …