More and more of the world’s waters are seriously lacking oxygen.
Could we use pumps to bring oxygen and thus higher life back into these waters? A Danish/Swedish research team says yes. They installed pumps in a Swedish fjord that showed a strong oxygen deficit and now they report that all the right oxygen-loving organisms have come back to the fjord.
Lack of oxygen is a major problem in many of the world’s waters. Both big oceans and small fjords are affected, and climate models predict an increase of this phenomenon in the future. To bring oxygen and thus higher life back to these waters is a huge task. But maybe it is possible – at least judging by a pilot project in a Swedish fjord.
“Our Swedish colleagues got the idea to use a pump to mix oxygen-rich surface water into the deeper parts of the water column in the fjord which was lacking oxygen”, says postdoc Michael Forth and Associate Professor Alexander Treusch from the Nordic Center for Earth Evolution, Institute of Biology at the University of Southern Denmark.
Could also help the Baltic Sea
The Swedish part of the team, Professor Anders Stigebrandt and Dr. Bengt Liljebladh from the Department of Earth Sciences, Oceanography, and Professor Per Hall from the Department of Chemistry and Molecular Biology, Marine Chemistry at the University of Gothenburg, were interested if pumps could support and enhance natural venting events, that bring oxygen-rich water into deeper parts of the water column. Ultimately such an approach could be used to increase water quality in the oxygen-lacking Baltic Sea, they believe.
To test these ideas, a large-scale experiment was conducted in a Swedish fjord called Byfjord, which is located near the town of Uddevalla. Similarly to the Baltic, the four kilometer long and 1.5 km wide fjord has a shallow entrance with a deeper basin that, in the case of the fjord, is 51 m deep. The water in the fjord’s deep basin doesn’t get mixed as oxygen-rich water coming in from the Kattegat Ocean and the river Bävenå exchanges only the surface water. Therefore the bottom waters suffer from a long-term lack of oxygen.
The pump was used during multiple periods between 2010 and 2013 to bring oxygen-rich water from the fjord’s surface down to about 35 meters depth. The surface water then was naturally and instantly replaced with new water from the Kattegat Ocean, creating inflows of oxygen-rich water into the fjord.
Two months of pumping
Did the experiment work? After two months of pumping, higher oxygen concentrations became detectable in the bottom waters.
Forth says “Already while the pumps were working we could see how some oxygen requiring bacteria returned into the deeper water of the fjord and some that don’t like oxygen disappeared.”
Read more: Scientists bring oxygen back to dead fjord
The Latest on: Ocean and fresh water oxygen deficit
via Google News
The Latest on: Ocean and fresh water oxygen deficit
- Photographic evidence of climate change in the Northweston October 14, 2019 at 11:58 am
Changing ocean conditions, which might in part be caused by human-caused climate change, might play a role as well. Climate change is likely to play a bigger role in coming years. Pollution and boat ...
- The oceans are set to boilon October 8, 2019 at 7:32 am
which is also creating a fresh water-sea water imbalance (stratification), causing further damage. And because the oceans are ingesting CO2, they are becoming acidic, killing food and oxygen for ...
- Understanding The UN’s Newest Report On Climate Change And The Oceanson October 2, 2019 at 10:04 am
In short: the ocean is heating up and becoming less oxygen-rich, leading to massive die-offs and direct threats to marine ... In terms of interior cryospheres (such as, say, mountain glaciers that ...
- Will a social movement help save our oceans?on September 26, 2019 at 4:02 pm
All people on Earth depend on the ocean and cryosphere – the frozen regions of our planet. Together they provide vital services to humanity including food, fresh water and energy ... becoming more ...
- How Oceans Rise and Die on a Warming Planeton September 26, 2019 at 8:48 am
in which the freshwater acts as a kind of lid, preventing the ocean from maintaining the oxygen levels that marine life needs to survive. Or how the warming ocean causes more intense storms, and how ...
- Oceans and ice are absorbing the brunt of climate changeon September 26, 2019 at 5:11 am
So the top part of the ocean stagnates slightly, holding less oxygen and less of the critical nutrients ... Glacier melt currently provides fresh water to millions of high-mountain dwellers, as well ...
- Oceans face dire threats from climate change. They also hold answers.on September 25, 2019 at 3:39 pm
critical sources of fresh water for populations around the world, are receding, and widespread permafrost thaw – which could exacerbate warming as methane is released – is predicted for this century.
- Climate Change Is Wreaking Havoc on Our Oceans. Here’s How We Save Them.on September 25, 2019 at 2:02 am
It comes down to conserving marine areas and urgently reducing our emissions. Adam Obaza/WCR PRD, NOAA/Flickr The fate of our oceans and climate are inextricably linked. That’s now clearer than ever ...
- Climate change could turn oceans from friend to foe, UN report warnson September 20, 2019 at 11:33 am
Paris (AFP) - Global warming and pollution caused by humanity's carbon-heavy footprint are ravaging Earth's oceans and icy regions in ways ... then too little to billions who depend on them for fresh ...
- The Ocean Is Running Out of Breath, Scientists Warnon February 25, 2019 at 3:54 am
Escaping predators, digestion and other animal activities—including those of humans—require oxygen. But that essential ingredient is no longer so easy for marine life to obtain, several new studies ...
via Bing News