All for Joomla All for Webmasters

Warning

JUser: :_load: Unable to load user with ID: 976

06 Jun

'Dirty Blizzard' sent 2010 Gulf oil spill pollution to seafloor

By 
(0 votes)

Scientists working in the Gulf of Mexico have found that contaminants from the massive 2010 Deepwater Horizon oil spill lingered in the subsurface water for months after oil on the surface had been swept up or dispersed. In a new study, they also detailed how remnants of the oil, black carbon from burning oil slicks and contaminants from drilling mud combined with microscopic algae and other marine debris to descend in a "dirty blizzard" to the seafloor.

The work, published May 30 in the Proceedings of the National Academy of Sciences, confirms that contaminants found in the water column and on the seafloor were indeed from the Deepwater Horizon spill, and not from the many natural oil seeps in the Gulf. The initial dispersal of materials in the water made pollutants hard to detect, but the eventual accumulation of "marine snow" concentrated the toxins on the seabed, where they can enter the food web, possibly affecting fish and corals in deep waters.

 

The findings suggest that the ecological effects of oil spills could last longer than previously thought. The paper comes on the heels of the most recent spill, detected May 12. About 88,200 gallons of oil were released from an underwater pipeline operated by Shell about 90 miles off the coast of Louisiana, according to news reports. Much of the oil has been recovered, and there are as yet no reported impacts on wildlife. But scientists are just beginning to assess the effects.

"We knew oil pollutants can be carried downward by marine snow, but we didn't expect the pollutants to stay in the water for such a long time," said Beizhan Yan of the Lamont-Doherty Earth Observatory, an environmental chemist who is lead author of the study.

Some researchers have contended that contaminants found on the seafloor could be coming from natural oil seeps. But Yan and colleagues used various "fingerprinting" techniques to demonstrate that the hydrocarbons in the water were derived from crude oil of the kind leaking from the Deepwater Horizon site. The presence of barium and the distribution of olefin compounds, two key components in drilling mud, confirmed the contaminants were associated with the spill.

"It's kind of like a smoking gun for the source of the contaminants," Yan said.

The study also sheds light on why these contaminants can stay so long—five months—in the water column. "The deposition of hydrocarbons was largely controlled by the particle sources, which are available sporadically," Yan said. "Hydrocarbons, especially high molecular weight ones, were adsorbed tightly to fine particles. These fine particles can linger in the water column for weeks." But a bloom of diatoms, microscopic marine plants, acted as a "dust bunny" to accumulate the particles and carry them below after the diatoms died, he said.

"Normally we don't think of oil as sinking," said co-author Uta Passow, a biological oceanographer at the Marine Science Institute at the University of California Santa Barbara. "People in the past have not really ever considered oil coming to the seafloor, especially very, very deep. We now know how the oil gets down there in large amounts and affects the communities that live there."

Though it's tough to measure exactly how much of the spilled oil winds up on the seafloor, Passow said it could be substantial. "I would argue it's probably more than 10 percent, probably even more than 15 percent," she said. That could add up to millions of gallons.

Other studies have documented how the oil and other contaminants dispersed, and have established that petroleum hydrocarbons from the spill have accumulated on the seafloor. Scientists also have known that phytoplankton, microscopic marine plants, play a role in delivering the oil to the seafloor. In the new study, the researchers describe how that happens.

 

Read 43057 times Last modified on Tuesday, 14 June 2016 10:54

Etiam sit amet orci eget eros faucibus tincidunt. Duis leo. Sed fringilla mauris sit amet nibh. Donec sodales sagittis magna. Sed consequat, leo eget bibendum sodales, augue velit cursus nunc, quis gravida magna mi a libero. Fusce vulputate eleifend sapien.

Website: www.bdthemes.com

3690 comments

  • tag heuer replica uhren posted by tag heuer replica uhren Thursday, 19 October 2017 10:55

    It works at the volume of 19,800 vibrations every hour and allows for a 40-hours energy pre-book.
    tag heuer replica uhren http://sporttagheueruhren.soup.io/

    Comment Link
  • 博裕进口流程有限公司 posted by 博裕进口流程有限公司 Thursday, 19 October 2017 10:48

    1、 要严查“黑龙江农民偷种转基因大豆”事件。”不过除了印度,人员来往频繁,元旦春节临近 进口食品中文标签“缺席”现象仍旧普遍 食品产业网 (2015年12月29日09:22) 导读:在走访中发现此外,如同一只被按压的弹簧, 茂名玩具、体育用品、生猪、月饼、罐头等产品相继叩开国际市场大门,"张海民说。按照设计几何参数对齿轮齿面的几何形状偏差进行测量。以前都没听说过。

    Comment Link
  • Itamar Serpa Fernandes posted by Itamar Serpa Fernandes Thursday, 19 October 2017 10:12

    If you are going for best contents like me, only pay a visit this web page daily since it offers feature contents, thanks|

    Comment Link
  • בנייה וקידום אתרים posted by בנייה וקידום אתרים Thursday, 19 October 2017 09:44

    When I originally commented I clicked the -Notify me when new comments are added- checkbox now if a comment is added I buy four emails with similar comment. Could there be that is you are able to eliminate me from that service? Thanks!

    Comment Link
  • 斜械蟹芯锌邪褋薪芯褋褌褜 褋胁邪褉褖懈泻 芯斜褍胁褜 posted by 斜械蟹芯锌邪褋薪芯褋褌褜 褋胁邪褉褖懈泻 芯斜褍胁褜 Thursday, 19 October 2017 09:11

    SPILLCONGO S.A.R.L - 'Dirty Blizzard' sent 2010 Gulf oil spill pollution to seafloor

    Comment Link
  • replica Rolex Day Date posted by replica Rolex Day Date Thursday, 19 October 2017 08:25

    Within the watch small business, Rolex watch bit is the chief of watch produce.
    replica Rolex Day Date http://ameblo.jp/luxreplica/

    Comment Link
  • Grupo Serval escandalo posted by Grupo Serval escandalo Thursday, 19 October 2017 07:42

    My programmer is trying to persuade me to move to .net from PHP. I have always disliked the idea because of the costs. But he's tryiong none the less. I've been using WordPress on a variety of websites for about a year and am worried about switching to another platform. I have heard excellent things about blogengine.net. Is there a way I can transfer all my wordpress posts into it? Any kind of help would be greatly appreciated!|

    Comment Link
  • lampadina del globo posted by lampadina del globo Thursday, 19 October 2017 07:30

    SPILLCONGO S.A.R.L - 'Dirty Blizzard' sent 2010 Gulf oil spill pollution to seafloor

    Comment Link
  • Deanna posted by Deanna Thursday, 19 October 2017 07:11

    Additionally, since our Internet Entry database is frequently upgraded and expanded (old
    engines are removed and also new engines are included), resubmitting your website each
    month implies that your site information will be included in new
    internet search engine as well as directories that weren't consisted
    of in earlier entries.

    Comment Link
  • Lelio Junior posted by Lelio Junior Thursday, 19 October 2017 05:11

    I'm more than happy to find this site. I need to to thank you for ones time due to this wonderful read!! I definitely loved every part of it and I have you book marked to look at new information in your blog.|

    Comment Link

Leave a comment

Make sure you enter the (*) required information where indicated. HTML code is not allowed.

Clients Testimonials

Joomla Module OT Testimonial powered by OmegaTheme.com

Join Newsletter

By subscribing to our mailing list you will always be update with the latest news from.

Don't worry, we hate spam!

Flickr Feed

Visitors Counter

Today17
Total1537365

Visitor Info

  • IP: 23.20.86.177

2017-10-22