Climate Letter #1413

Posted on April 26, 2019 by Carl Campbell
There are a large number of new studies that need reporting today:

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Antarctic glaciers should slide toward the sea less rapidly than feared (Phys.org).  New research explains why it could take a few hundred extra years, which is good news, but the end result remains the same.  “One of the main things we learned was that as grounded ice retreats inland, the bedrock under it lifts up elastically…..It’s like a truck traveling downhill that encounters speed bumps in the road…..The truck will slow down a bit but will ultimately continue down the hill…..just as the ice sheet will continue to melt and sea level will continue to rise.”
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Extreme ocean winds and waves have become more common over the past three decades (Newsweek).  Scientists believe climate change is the cause, making the upward trend likely to continue.  Among other things, this is likely to enhance the damage done by coastal flooding during major storm events.
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Global warming is doing more harm to life in the oceans than to species living on land (Inside Climate News).  “Sea creatures, especially those that live in shallower water near the coasts, are much more vulnerable to global warming than land animals, new research shows. The scientists found that local populations of marine animals are disappearing at double the rate of land-based species.”  The reasons and the consequences are frightening.
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Scientists have evidence of the impact of ocean acidification on marine life (Phys.org).  Human societies are also endangered in many ways.  “The chemistry of this rapid change in surface waters is understood, yet there is uncertainty about its effects on society which is what we are trying to overcome in this study.”
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New information about the way carbon is pumped down to ocean depths, and why the process may be weakening (EurekAlert).  The role of small fish, which are endangered, is much more important than thought, enough to change climate models covering this important sink.
–A different study tells of the discovery that tiny microbes also have a role in sequestering carbon in the ocean, moving it to deep subduction zones and eventual permanent burial in Earth’s mantle.  The effect helps to cool the climate, but only on geological timescales.
Carl

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