The 2019 Arctic Report Card has been issued by NOAA, as summarized by Inside Climate News. As in all recent years the message is all about trends and statistics that are troublesome, going well beyond the total impact of gobal warming that is seen in the rest of the world. This year there is a special focus on regions being hit the hardest, where the Bering Sea area stands out. Suffering among many species of wildlife is rampant, causing much concern for indigenous hunters who rely on them for their own sustenance.
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—Reuters has more to say from the NOAA report about America’s fisheries in the Bering Sea:
–A separate study, published by the Royal Society, details research indicating that the loss of oxygen is directly responsible for the deterioration of cod species in the Baltic Sea. (Also, see CL #1569 for a review of a major report that covered deoxygenation of the oceans on a global scale.)
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Greenland is losing ice seven times faster than in the 1990s (University of Leeds). An international team of 96 scientists has done an exhaustive study and come up with that startling result, even after excluding the peak loss years of 2011 and 2019. The current rate of melting that they found will have to affect IPCC estimates for sea level rise by the end of the century. The study did not attempt to predict further increases in the rate of melting, which many of the scientists surely suspect, but maybe not by that same degree, which is pretty extreme over roughly two decades. Interestingly, “The team also used regional climate models to show that half of the ice losses were due to surface melting as air temperatures have risen. The other half has been due to increased glacier flow, triggered by rising ocean temperatures.” Another study published just a week ago (CL #1565) found new reasons to worry about the way surface melting on Greenland was causing unexpected instability via fracturing effects.
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An analysis of sea level acceleration over the last century (Open Mind). A climate scientist who does advanced statistical analysis on his own time, and has a big following, produced this work which I think is really interesting for anyone willing to dig into it a bit. The main conclusion one can draw is that the rate of sea level rise, while always fluctuating, is also accelerating, and has been so in a quite regular way since around 1950. If that same rate of acceleration continues for another half century or more, as suggested by the melting trends recorded elsewhere, the projected curve gets pretty steep when you let your eyeballs trace it upward and off the charts.
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New information about sources of methane, a greenhouse gas which has been steadily rising in the atmosphere since 2007 (European Geosciences Union). Scientists have found the information they have long been looking for, in an unexpected place—wetland regions in tropical Africa. The amount discovered, equal to one-third of the total increase between 2010 and 2016, is extraordinarily large, and must be taken seriously in all future methane studies, but cannot be readily extrapolated at that same rate into other time frames.
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The preservation and restoration of mangrove ecosystems has a vital role in mitigating climate change (University of Gottingen). New research has found physical evidence giving strong support to ideas that have often been suggested but not proven.
Carl