What is IPY
September 21st, 2007 marks the first of quarterly International Polar Days, this time focusing on Sea Ice.
Sea ice, the thin layer of ice that covers most of the Arctic Ocean and surrounds most of the Antarctic continent, represents a distinctive feature of our planet. Sea ice spreads and retreats seasonally. It drifts and packs under the influence of wind and currents. It isolates the atmosphere from the ocean and produces the coldest saltiest ocean waters. It restricts the movement of ships but supports the traverses of bears.