Research press release


Nature Geoscience

Volcanic eruptions shake up streamflow around the world



Carley Iles とGabriele Hegerlは、19世紀後半~20世紀に少なくとも2回、最大6回の大規模火山噴火の記録がある世界の50の主要な河川について、流量の体積の観測記録を研究し、これらの噴火後には、アマゾン川をはじめコンゴ川、ナイル川などと、高緯度のアジア等のより広い地域では統計的に有意に流量が減少していることを見つけた。対照的に、アメリカ南西部および南アメリカ南部では大きな噴火が起きた後に一貫して流量が増大していることも分かった。著者たちはまた、地球工学的計画も同様な効果をもたらす可能性があると述べている。

Global patterns of river flow change significantly in the year or two following a volcanic eruption, shows a study published online in Nature Geoscience. The findings suggest that future eruptions could affect water availability in many regions throughout the world.

In regions that are usually wet, reductions in rain and snowfall have previously been documented in the years following volcanic eruptions. However, whether any of these changes in precipitation systematically translate into variability in river flow was unclear.

Carley Iles and Gabriele Hegerl studied observational records of streamflow volume for 50 major world rivers, with each record including at least two and up to six large volcanic eruptions in the twentieth and late nineteenth century. In the years following these eruptions, they find statistically significant reductions in streamflow in some rivers, such as the Amazon, Congo and Nile, and in larger regions such as high-latitude Asia. In contrast, they found that streamflow consistently increased in the southwestern US and the southern part of South America after a large eruption took place. The authors also note that some geoengineering schemes may have a similar effect.

doi: 10.1038/ngeo2545


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