An update on Australia’s fire season (Phys.org). From all indications the situation is not going to get better anytime soon, and could get worse on some days. January is normally the hottest month of the year in Australia, and the southeastern region where many cities and towns are located is particularly dry right now. This post has a map clearly showing how much area has already been burned over in places we hear the most about.
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Scientists have found a link between losses of Arctic sea ice and the thawing rate of Siberian permafrost (University of Oxford). They have found visible supporting evidence and can further offer a reasonable explanation of how the connection unfolds. The implications suggest a likely effect on the future climate outlook: “Significant decreases of Arctic sea ice have been observed in recent years, and the Arctic is expected to be free of summer sea ice in the coming decades. Such loss of sea ice is likely to lead to an acceleration of thawing of permafrost in Siberia and to consequent release of carbon.”
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A new study explains why many recent climate models are projecting higher levels of warming (AGU100 Research Letter). The significantly large increases are primarily due to processes that would have the potential to reduce extratropical low cloud cover together with its current albedo effect. With respect to concerns over what this means, much uncertainty over the actual outcome remains in place: “Establishing the plausibility of these higher sensitivity models is imperative given their implied societal ramifications.” (There are still no final conclusions about what temperatures will really be like if and when we have doubled the CO2 level—around 560 ppm— and reach a full state of energy equilibrium. It can very well be over the common figure of about 3C.)
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Scientists now have a pretty good handle on what happened during the mid-Miocene warming event (Cardiff University). The event, caused by massive volcanism, is anxiously studied because it has so many climate-related features in common with those which are either present or soon expected in the current warming event. The eruptions took place over a 3-million year period, releasing vast amounts of carbon which nature was able to dispose of fairly quickly along the way, with only moderate damage to marine life and the environment compared to previous such events earlier in history.
–The full study has open access: https://www.nature.com/articles/s41467-019-13792-0
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Science has proven that spending time outdoors and interacting with the natural world is of great benefit to personal well-being (Yale e360). This wonderful article by Jim Robbins summarizes a number of studies that give all the reasons, and are completely convincing.
Carl