Important new findings related to the decomposition of soil carbon. This comes as the result of a 26-year experiment that is still ongoing. The researchers wanted to know what changes occur when you heat patches of soil, in this case in a wooded area, compared with similar patches that are not heated. As expected, the heating caused a bump up in CO2 emissions for several years, significant but not a truly large amount, and then stopped. Many other field experiments have had comparable results, but this one was different because the test was continued for many extra years, yielding to a renewed pulse of emissions after a lengthy delay. This was attributed to evolutionary changes in the microbe community, forming a new group that could feed on carbon held in place by bonds of a different type. At this point there is no telling how or when this chain of events might eventually stop. Soils that are extra-rich in carbon, such as those in the permafrost region, are a naturally worrisome target, but even those that are less well-endowed and located in warmer climate zones can also contribute emissions when heated, as this study shows.
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–The lead story in the Climate Letter of two days ago (#1016) also covered information about the diverse behavior of soil microbes, as noted in a different kind of study.
–Today’s story was also covered by a journalist at the Guardian, who gave it a somewhat broader treatment. It includes this comment from a professor who was not involved in the study, Daniel Metcalfe, of Sweden’s Lund University, who said, “If these findings hold more widely across major terrestrial ecosystems, then a much greater portion of the global soil carbon store could be vulnerable to decomposition and release of carbon dioxide under global warming than previously thought.” By implication, different levels of temperature increase need to be tested as well as different ecosystems.
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An interview with a professor who has been researching the Amazon region for three decades. His knowledge of what is happening in the area on many different levels is possibly unmatched. He doesn’t sound too hopeful.
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A report from Joe Romm on various records that were set in September. According to satellite data this was the hottest September on record, in spite of a lack of any kind of boost from El Nino effects. Previous El Nino events have almost always been followed up by much stronger declines than this one for a year or two.
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Miami has just experienced another of its annual king tides. It gives people a taste of what the future will be like under further increases in sea level.
https://slate.com/business/2017/10/massive-october-king-tide-gives-miami-another-taste-of-climate-change.html
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A strange phenomenon that scientists are trying to understand—the average global wind speed has been slowing down in a regular way since 1960.