Research press release


Nature Geoscience

Vigorous ocean bottom current discovered

南極の大陸棚海からの密度が大きく冷たい水は、深さ3,000メートル以深で発見された最強の平均流として北向きに流れる。Nature Geoscience(電子版)に掲載される研究は、南極近傍のケルゲルン海台に沿った強い流れは全球海洋深層水循環の重要な一部分となっていることを明らかにしている。


News & ViewsでA Orsiは、「深町らがケルゲルン海台で報告しているような強力な海洋学的測定は、今後も気候学の研究者に大きな利益をもたらすだろう」と述べている。

Dense, cold water from the shelf seas off Antarctica flows northwards in the strongest mean current discovered at depths greater than 3,000 metres. Published online in Nature Geoscience, the observations of the vigorous flow along the Kerguelen Plateau near Antarctica reveal a significant branch of the global oceans' deep overturning circulation.

Yasushi Fukamachi and colleagues used an array of current meters in the deep water just east of the Kerguelen Plateau for two years, to monitor the northward flow at depth. They estimate that, on average, about eight million cubic metres of water colder than 0.2℃ are transported towards lower latitudes each second, roughly four times as much as previously documented in a different branch of deep Antarctic outflow. The so-called Antarctic Bottom Water forms the densest and deepest water mass involved in the global ocean circulation, which in turn is an important component of the climate system.

In an accompanying News and Views article, Alejandro Orsi says: "Vital oceanographic measurements, such as those reported by Fukamachi and co-authors from the Kerguelen Plateau, will continue to benefit climate scientists".

doi: 10.1038/ngeo842


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