Antarctic sea ice suffered a massive decline in December, leading to a record low on January 1. Unlike the Arctic, a high melt-rate for sea ice has been unusual for Antarctic summers until just the last several years. “Although it is too soon for us to isolate what caused the rapid December decline and recent record low extents, it is likely that unusual atmospheric conditions and high sea surface temperatures are playing a role.” The decline is perceived as a clear new signal of global warming.
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The lush Monteverde cloud forest in Costa Rica is drying out (The Guardian).. This unique ecosystem, along with sea ice and coral reefs, is one of the world’s three most sensitive indicators of global warming.
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Jellyfish populations are booming around the world, and causing mayhem. These creatures thrive in waters that have grown warmer and more polluted, and they don’t require much oxygen. This story from ABC News includes an amazing photo of a two-ton Nomura jelly with a human diver swimming nearby.
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Soot and smoke from North American wildfires are contributing to the meltdown of mountain glaciers. Surface darkening that allows greater absorption of sunlight has been observed in recent years over broadly extended areas.
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Haiti leads the world in present-day deforestation. According to satellite imagery, only about one percent of primary virgin forest now remains in place. “And because of the deforestation, they estimate more than half Haiti’s species will be wiped out by the year 2035.”
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Some scientists have revised their forecast for abrupt sea level rise from glacial collapse in West Antarctica. Their previous work attracted headlines because of dramatic projections seen as possible for later in this century. Those effects, in the form of a specific type of progressive ice sheet collapse, have now been postponed for up to two centuries. New ideas and further debate are likely to be forthcoming, so stay tuned.
Carl