The effect of global drought on the annual carbon sink can now be measured directly by satellite. The effect has been demonstrated to be quite powerful, roughly enough to explain the wide swings in the gains in atmospheric CO2 content from one year to the next, even when emissions due to human activity are little changed. Major El Nino years like 2015 feature unusual levels of drought in some rain forest areas, causing vegetation growth to suffer greatly. The study helps to evaluate short-term changes, which is useful for climate models, but makes no attempt to evaluate long term trends of drought conditions.
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Arctic sea ice is threatened by an unusual mass of warm water lying at depth in the ocean. A new study reports that the heat content of this layer has doubled in the past 30 years, and gives reasons for why this is happening. “That heat isn’t going to go away…..Eventually it’s going have to come up to the surface and it’s going to impact the ice…..a ticking time bomb.” Currently, a thick layer of cool fresh water on top keeps this warm but salty layer from rising.
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A group of three scientists, writing for The Conversation, explains the way melting sea ice and changing ocean currents in the Barents Sea area north of Europe are causing dramatic climate changes over land. As in the previous story, a layer of cool fresh water is involved, but in this case (a different location) it is being weakened by strong warm flows from the Atlantic. The end result contributes to a rising frequency of extreme weather events in Europe and northern Asia.
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Like California, British Columbia is having its worst fire season on record. The previous record was set just last year. A total of 534 fires are still active.
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David Roberts, at Vox, has an impressive review of the current state of solar energy technology and where it is heading. Silicon panels have gotten so cheap that current innovation is now more focused on lowering the cost of modules and inverters and improving their function, as well as everyday efficiency. For example, maintenance is getting a remarkable boost from robots that perform a daily cleaning automatically, without water. There is much more. “Ten years ago, no one expected this. I wonder what we’ll fail to anticipate in the next 10 years.”
Carl