Verwitterungsprozesse an der Erdoberfläche neutralisieren CO2 offenbar doch schneller als gedacht

Gute Nachrichten von der Florida State University am 1. August 2017. Das CO2 der Atmosphäre könnte sich durch Verwitterungsprozesse an der Erdoberfläche nun doch schneller zersetzen und neutralisieren als vormals angenommen:

Chemical weathering could alleviate some climate change effects

There could be some good news on the horizon as scientists try to understand the effects and processes related to climate change. A team of Florida State University scientists has discovered that chemical weathering, a process in which carbon dioxide breaks down rocks and then gets trapped in sediment, can happen at a much faster rate than scientists previously assumed and could potentially counteract some of the current and future climate change caused by humans. The findings were published in the journal Scientific Reports.

Scientists have generally thought that this process takes hundreds of thousands to millions of years to occur, helping to alleviate warming trends at an exceptionally slow rate. Rather than potentially millions of years, FSU researchers now suggest it can take several tens of thousands of years. It’s not a quick fix though. “Increased chemical weathering is one of Earth’s natural responses to carbon dioxide increases,” said Theodore Them, the lead researcher on the paper and a postdoctoral researcher at Florida State and the National High Magnetic Field Laboratory. “The good news is that this process can help balance the effects of fossil fuel combustion, deforestation and agricultural practices. The bad news is that it will not begin to counteract the excessive amounts of atmospheric carbon dioxide that humans are emitting for at least several thousand years.”

As atmospheric carbon dioxide concentrations increase, the climate gets warmer. The warmer climate speeds up chemical weathering, which consumes carbon dioxide from the atmosphere and mitigates the greenhouse effect, thus leading to climate cooling. To conduct the study, the research team determined the rate at which rocks were chemically broken down over a period of rapid warming in the Early Jurassic Epoch called the Toarcian Oceanic Anoxic Event, an interval where a major extinction event occurred about 183 million years ago. Working with colleagues at Durham University in the United Kingdom and using state-of-the-art analytical instrumentation within the National MagLab’s Geochemistry Group, the researchers processed and measured the trace elements of their rock samples.

“We noticed that although chemical weathering increased significantly during this time interval, it was not as large as previously hypothesized for this event,” Them said. “What’s really striking, however, is the planet’s ability to respond to these environmental changes on such short timescales.” This increased chemical weathering process could have another downside. The researchers’ findings suggest that widespread oxygen-deficient oceans occurred because an excess of nutrients from the breakdown of rocks flowed into the oceans during the Early Jurassic Period. The researchers predict that future changes in climate and weather patterns due to a warming planet will create more precipitation and increase the amount of river water and nutrients transported to coastal regions. This is expected to increase both the size and duration of future coastal ocean deoxygenation, negatively impacting sea life in those areas.

“Understanding ancient climatic change like this helps us anticipate the timing, implications, and environmental response to better predict future climate scenarios,” said FSU Assistant Professor of Geology Jeremy Owens, a co-author on the paper. Other authors on the paper include Benjamin Gill from Virginia Tech, David Selby and Darren Gröcke from Durham University and Richard Friedman from University of British Columbia.


In Australien gab es nun einen mysteriösen Temperaturdaten-Unfall. Offenbar sind mehrere kühle Temperaturmessungen einfach aus den Archiven verschwunden. Der Fall wird jetzt untersucht.


In Indien hat es 2016/17 eine neue Getreide-Rekordernte gegeben. Wie passt dies zu den Klimaalarmszenarien, die die Landwirtschaft und Nahrungsmittelversorgung in den Subtropen als stark gefährdet darstellen?


Bericht in der Zambia Daily Mail Limited am 24. August 2017:

Germany pumps €4 million in climate change research
The German government has pumped about €4 million in a project to conduct research in climate change and sustainable land management use in Zambia.

Weiterlesen in der Zambia Daily Mail Limited

Vielleicht ein ganz gutes Projekt. Musste der Klimawandel wirklich mit in den Titel? Vielleicht wäre ein Blick in die Klimageschichte der letzten 1000 Jahre zunächst hilfreich. Auf unserer Kartierprojekt-Online-Karte zur Mittelalterlichen Wärmeperiode (MWP) erkennen wir eine große Wissenslücke in Sambia. Mit Ausnahme einer Torfkernstudie im Westen des Landes, wurden bisher keine Fallstudien zur klimatischen Entwicklung des Landes durchgeführt. Wäre dies nicht eine wichtige Grundlage, um den modernen klimatischen Wandel besser in den Langfristkontext einordnen zu können?