A new study has found that turbulent mixing in the deep waters of the Southern Ocean, which has a profound effect on global ocean circulation and climate, varies with the strength of surface eddies – the ocean equivalent of storms in the atmosphere – and possibly also wind speeds.
It is the first study to link eddies at the surface to deep mixing on timescales of months to decades.
This new insight into how the Southern Ocean behaves will allow scientists to build computer models that can better predict how our climate is going to change in the future.
The findings are published in the latest issue of Nature Geoscience.
The Southern Ocean plays a pivotal role in the global overturning circulation, a system of surface and deep currents linking all oceans and one of the fundamental determinants of the planet's climate. The Southern Ocean around Antarctica is the only location where the ocean can circulate freely all the way around the globe without continental barriers.
Because the ocean is made up of many layers of water that are dependent on temperature and salinity, water moves easily along horizontal or 'isopycnal' layers, but mixes only slowly across the layers, known as 'diapycnal' mixing. This combination of diapycnal and isopycnal mixing drives the upwelling of deep waters up to the surface, forming an 'upper' and 'lower' overturning cell. When deep waters rise to the surface, they bring with them the nutrients that plankton need to grow. Conversely, as surface waters sink they take heat and dissolved CO2 from the atmosphere, strongly shaping regional and global climate change.
The researchers took measurements of small-scale temperature and velocity fluctuations, to measure the diapycnal movements in the Antarctic Circumpolar Current (ACC) across the Drake Passage region of the Southern Ocean.
The data revealed that, during the period of their measurements, turbulence in deep waters significantly correlated with surface eddy activity. The mechanism that causes eddies in the surface ocean leads to an intensification of currents in the top and bottom layers of the ocean. When such instability arises, strengthened bottom currents interact with rough bottom topography to generate internal waves that eventually devolve into turbulence. This process provides a source of energy for the mixing of abyssal waters, which, in turn, hastens the global overturning circulation.
The researchers established that deep water eddies are likely energised by strong westerly winds over the Southern Ocean that force the ACC and that abyssal mixing, on time scales of months to decades, reacts to this changing atmospheric climate.
Study co-author Katy Sheen, a Postdoctoral Research Fellow from Ocean and Earth Science at the University of Southampton, says: "These findings will help us to understand the processes that drive the ocean circulation and mixing so that we can better predict how our Earth system will respond to the increased levels of carbon dioxide that we have released into the atmosphere."
The researchers used data from the 'Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean' (DIMES) project, a UK/US field program aimed at measuring diapycnal and isopycnal mixing in the Southern Ocean. DIMES released a chemical dye tracer into the ACC about a mile below the sea surface. Over five years, the horizontal and vertical spread of the tracer was mapped out by measuring its concentration in hundreds of seawater samples, to identify how quickly the Southern Ocean moved water particles around. It also used a mooring cluster of sensors in the Drake Passage to provide detailed time series information on the processes responsible for the mixing of the tracer.
Glenn Harris | Eurek Alert!
NASA eyes Pineapple Express soaking California
24.02.2017 | NASA/Goddard Space Flight Center
'Quartz' crystals at the Earth's core power its magnetic field
23.02.2017 | Tokyo Institute of Technology
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News