Antarctic sea ice forms in the Southern Ocean surrounding the continent of Antarctica. It typically expands during the winter months and retreats in the summer, playing a crucial role in regulating the Earth's climate. The ice reflects sunlight, helping to keep the planet cool, and provides a habitat for various marine species. The extent of Antarctic sea ice has been observed to fluctuate significantly over the years. Scientists monitor these changes to understand their impact on global sea levels and ocean circulation. The melting of sea ice can also affect weather patterns and ecosystems both locally and globally.