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LETTER TO THE EDITOR: Antarctic ice-cap changes are natural, cyclical
Question of the Day
Alarmists see a man-made calamity in every change in the Antarctic ice cap. However, there is nothing unusual about ice caps melting, ice sheets splitting, icebergs calving or glaciers advancing or retreating. This has been happening naturally for eons.
In 1513, a Turkish sea captain, Piri Reis, using ancient maps, produced an accurate chart of the coastline of Antarctica, which is now covered by a kilometer of ice. Geological evidence suggests it was ice-free just 6,000 years ago. Several past eras of icing and melting follow the natural cycles of the solar system, totally ignoring man’s puny activities.
It is not surprising that most glaciers and ice sheets show melting and calving while snow is being added at their source. If this did not occur, much of Earth’s water would eventually become tied up in the ever-growing ice sheets, as happened during the ice ages. And when land-based ice caps melt during periodic warm eras, the sea level inevitably rises and all life forms must adapt to the new shoreline.
Sea levels rose swiftly by some 130 meters as ice sheets melted at the end of the latest ice age just 13,000 years ago. This made islands out of many coastal hills. We are all descendants of a long line of survivors who had the sense to adapt to these dramatic sea-level changes without needing edicts from climate witch-doctors prohibiting campfires and ordering villagers to abandon their seaside settlements.
There is no evidence that man’s production of carbon dioxide is having any effect in Antarctica. Despite rising levels of atmospheric carbon dioxide, global surface temperatures are steady, global sea levels are rising very gently, and the Antarctic Ocean is cold because the sea ice surrounding Antarctica has increased to record levels.
Examination of ice cores suggests that it takes several hundred years for Earth’s vast oceans to fully adjust to cycles of global warming and cooling. Thus, today’s oceans may be still warming, expanding and degassing in gradual adjustment to the medieval warm era, which peaked about 700 years ago.
Ice caps grow and shrink naturally, depending mainly on the relative temperatures of the atmosphere and the surrounding oceans. A warm ocean with a cold atmosphere is a recipe for rapid accumulation of snow and ice on adjacent land. Moisture evaporates rapidly from the warm ocean, and then the cold air over the land triggers precipitation. A warm atmosphere and a cool ocean will reverse that process and see the ice caps return to the ocean. It is all about the ratio of precipitation to outflow and melting.
Someday, the huge Antarctic ice cap may melt, or large slabs of ice may slip off the continent into the sea. When that happens, the seaside homes of Al Gore and Australian global-warming activist Tim Flannery will be submerged, and other shore-dwelling humans must evacuate or drown.
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