key term - Arctic sea ice

Definition

Arctic sea ice refers to the frozen seawater that forms and melts in the Arctic Ocean and surrounding seas. This ice plays a crucial role in regulating the Earth's climate by reflecting sunlight, maintaining ocean circulation, and influencing weather patterns, thus connecting it to tipping points and abrupt changes in Earth systems.

5 Must Know Facts For Your Next Test

1. Arctic sea ice extent has been declining significantly over the past few decades due to climate change, with September 2020 recording one of the lowest extents since satellite observations began in 1979.
2. The melting of Arctic sea ice contributes to rising sea levels as it alters oceanic heat distribution and increases absorption of sunlight by darker ocean waters, enhancing global warming.
3. As Arctic sea ice decreases, it can trigger feedback loops that further accelerate climate change, such as increased methane emissions from thawing permafrost.
4. The loss of sea ice affects local ecosystems, including species like polar bears and seals that rely on ice for hunting and breeding, creating risks for biodiversity.
5. Changes in Arctic sea ice are linked to extreme weather events in other regions, as they can disrupt normal atmospheric patterns, leading to unusual weather conditions far from the Arctic.

Review Questions

• How does the decline in Arctic sea ice impact global climate systems?
  • The decline in Arctic sea ice affects global climate systems by reducing the Earth's albedo, leading to increased solar absorption by the ocean. This creates a feedback loop where warmer waters cause more ice to melt, further exacerbating climate change. Additionally, changes in Arctic sea ice can disrupt ocean circulation patterns, which are crucial for regulating temperatures and weather globally.
• Discuss the ecological consequences of declining Arctic sea ice for local wildlife and ecosystems.
  • Declining Arctic sea ice has profound ecological consequences for local wildlife such as polar bears, seals, and seabirds that depend on the ice for hunting, breeding, and resting. As the ice diminishes, these species face challenges in finding food and suitable habitats, leading to decreased populations and potential extinction risks. The loss of ice also impacts other aspects of the ecosystem, such as nutrient cycling and habitat availability for marine life.
• Evaluate the potential long-term effects of continued Arctic sea ice loss on global weather patterns and climate stability.
  • Continued loss of Arctic sea ice could lead to significant long-term effects on global weather patterns and climate stability. As the ice melts, it alters atmospheric circulation systems, potentially causing more frequent extreme weather events like heatwaves or heavy precipitation in various parts of the world. Additionally, this loss may contribute to shifts in ocean currents that affect marine ecosystems and fisheries globally. The implications of these changes highlight the interconnectedness of Earth's systems and underscore the urgency for climate action.

Related terms

Albedo effect: The albedo effect is the measure of how much sunlight is reflected by a surface. Sea ice has a high albedo, meaning it reflects most of the sunlight, which helps to keep the Arctic region cooler.

Permafrost: Permafrost is permanently frozen ground that can release greenhouse gases like methane when it thaws, contributing to global warming and further impacting Arctic sea ice.

Ocean circulation: Ocean circulation refers to the large-scale movement of water within the oceans, which is influenced by sea ice formation and melting, affecting global climate patterns.