Navigation Links
Asleep in the deep: Model helps assess ocean-injection strategy for combating greenhouse effect

In searching for ways to counteract the greenhouse effect, some scientists have proposed capturing the culprit---carbon dioxide---as it is emitted from power plants, then liquefying the gas and injecting it into the ocean. But there are pitfalls in that plan.

The carbon dioxide can rise toward the surface, turn into gas bubbles and vent to the atmosphere, defeating the purpose of the whole grand scheme. Even worse, if the liquid-to-gas conversion happens suddenly, the gas can bubble up in a plume and erupt---a potential hazard.

Small-scale ocean experiments have been done to investigate how the carbon dioxide (CO2) actually would behave, but such experiments are too costly and time consuming to carry out under a wide range of ocean conditions. However, a new theoretical model developed by University of Michigan researcher Youxue Zhang can be used to explore the fate of CO2 injected into oceans under various temperature and pressure conditions. Zhang's model shows that liquid CO2 would have to be injected to a depth of at least 800 meters (about a half mile) and possibly as much as 3,000 meters (nearly two miles) to keep it from escaping.

Eruptions from injected CO2 are a serious concern, Zhang said, "because carbon dioxide is known to have driven deadly water eruptions." In 1986, a CO2-driven eruption in Cameroon's Lake Nyos killed some 1,700 people, as well as animals in the area; two years earlier, a smaller release of CO2 from Lake Monoun in the same country resulted in 37 human deaths. The deaths were not directly caused by the explosions, but resulted from carbon dioxide asphyxiation. "Carbon dioxide is denser than air, so it settled down and flowed along the river valley, choking people and animals to death."

The challenge in designing CO2 injection strategies is figuring out how to keep droplets of the liquid from rising to 300 meters---the approximate depth at which, depending upon temperature and pressure, liquid CO2 become s a gas. One solution is to make the droplets smaller.

"Droplets injected to a depth of 800 meters will rise, but if they are small enough they should dissolve completely before reaching the liquid-gas transition depth---assuming everything works perfectly," said Zhang, a professor of geological sciences. However, at a high injection rate, seawater full of CO2 droplets would have an average density smaller than that of surrounding seawater, creating conditions that could lead to a rapidly-rising plume. Problems also could occur if the injection device malfunctioned, producing larger droplets.

"An even safer injection scheme would be to inject into a depth of more than 3,000 meters, where CO2 liquid is denser than seawater and would sink and dissolve," Zhang said.

Calculations based on Zhang's theory closely match observations from experiments in which remotely controlled submersibles tracked and photographed individual droplets of liquid CO2.

"Of course, you cannot do such experiments under all different conditions, at different depths and different temperatures," Zhang said. "That's why you need a theory to be able to calculate the behavior under any conditions."

Injecting CO2 into the ocean may have environmental consequences, which must be addressed before decisions are made on whether such injections are a viable way to reduce carbon dioxide emission into the atmosphere, Zhang added.

Zhang's work was described in a paper in the Oct.1 issue of the journal Environmental Science & Technology. The research was partially supported by the National Science Foundation and the American Chemical Society Petroleum Research Fund.


'"/>

Source:University of Michigan


Related biology news :

1. Study Models Impact Of Anthrax Vaccine
2. Research Using Mouse Models Reveals A Novel Key Player In The Initiation Of Colon Cancer
3. Model identifies genes that induce normal skin cells to become abnormal
4. Jumping gene helps explain immune systems abilities
5. Protein helps regulate the genes of embryonic stem cells
6. Scientists reveal the shape of a protein that helps retroviruses break into cells
7. Thai spice helps cut blood sugar swings
8. Chemists synthesize molecule that helps body battle cancers, malaria
9. Ancient DNA helps clarify the origins of two extinct New World horse species
10. Massey Cancer Center researcher helps to identify a piece of the cancer puzzle
11. Study: Well-known protein helps stem cells become secretory cells
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/15/2016)... -- Yissum Research Development Company of the Hebrew ... Hebrew University, announced today the formation of Neteera ... human biological indicators. Neteera Technologies has completed its first ... ... emissions from sweat ducts, enables reliable and speedy biometric ...
(Date:3/14/2016)... , Allemagne, March 14, 2016 ... http://www.apimages.com ) - --> - Renvoi : ... - --> --> ... solutions biométriques, fournit de nouveaux lecteurs d,empreintes digitales ... LF10 de DERMALOG sera utilisé pour produire des ...
(Date:3/11/2016)... India , March 11, 2016 ... a new market research report "Image Recognition Market by ... Application (Marketing and Advertising), by Deployment Type (On-Premises and ... Forecast To 2022", published by MarketsandMarkets, the global market ... 2015 to USD 29.98 Billion by 2020, at a ...
Breaking Biology News(10 mins):
(Date:5/27/2016)... ... 2016 , ... NeuMedics Inc. is pleased to announce that CEO Iain Duncan ... June 2, 2016. The session begins at 1:10 PM and Iain will present the ... used as a topical agent and a treatment for ophthalmic complications of diabetes. , ...
(Date:5/27/2016)... ... ... Doctors in Italy, Japan, the UK and the US have reached some ... and its link to malignant mesothelioma. Surviving Mesothelioma has just posted the details of ... , The studies analyzed for the new report included more than 3,447 cancer ...
(Date:5/26/2016)... 26, 2016  Agriculture nutrients are in the news ... is running their nitrate removal system on ... and coastal regions nationwide are painting the ... widespread issue. NECi Superior Enzymes, a biotechnology ... developed a new, easy to use device that fits ...
(Date:5/26/2016)... , May 26, 2016 Despite the ... value in this space. Today,s pre-market research on ActiveWallSt.com directs ... Health Inc. (NASDAQ: RDUS ), Cerus Corp. (NASDAQ: ... ARWR ), and Five Prime Therapeutics Inc. (NASDAQ: ... briefings at: http://www.activewallst.com/ On ...
Breaking Biology Technology: