Navigation Links
Scientists find black gold amidst overlooked data

About half of the oil in the ocean bubbles up naturally from the seafloor, with Earth giving it up freely like it was of no value. Likewise, NASA satellites collect thousands of images and 1.5 terrabytes of data every year, but some of it gets passed over because no one thinks there is a use for it.

Scientists recently found black gold bubbling up from an otherwise undistinguished mass of ocean imagery. Chuanmin Hu, an optical oceanographer at the University of South Florida, St. Petersburg, and colleagues from the National Oceanic and Atmospheric Administration (NOAA) and the University of MassachusettsDartmouth (UMass), found that they could detect oil seeping naturally from the seafloor of the Gulf of Mexico by examining streaks amid the reflected sunlight on the ocean's surface.

Most researchers usually discard such "sun glint" data as if they were over-exposed photos from a camera. "Significant sun glint is sometimes thought of as trash, particularly when you are looking for biomass and chlorophyll," said Hu. "But in this case, we found treasure."

The new technique could provide a more timely and cost-effective means to survey the ocean for oil seeps, to monitor oil slicks, and to differentiate human-induced spills from seeps.

Oil decreases the roughness of the ocean surface. Depending on the angles of the camera and of the light reflection, oil creates contrasting swaths that can show up in airborne images as either lighter or darker than the surrounding waters.

The detection and monitoring of oil spills and seeps by satellite is not new. Visible, infrared, microwave, and radar sensors have all been used, with synthetic aperture radar (SAR) being the most popular and reliable method in recent years according to the study authors. SAR imagery can be very expensive, the authors note, and timely, repeat coverage is not always possible, particularly in tropical regions.

Using imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on NASA's Terra and Aqua satellites, Hu and colleagues assert, is far cheaper because the data is collected daily and provided freely by NASA, without the need for special observation requests. And the polar orbits of Terra and Aqua allow images of oil slicks to be collected several times per week in tropical regions and perhaps several times a day at higher latitudes. The description of the new technique was published in January in Geophysical Research Letters.

Hu actually happened upon the oil imagery while looking for signs of harmful algal bloomscommonly referred to as "red tide"in the western Gulf of Mexico. Examining MODIS images, he kept noticing streaks across the sun glint reflections. After conferring with study co-authors Xiaofeng Li and William Pichel of NOAA and Frank Muller-Karger of UMass, Hu became aware that the streaks could be oil from natural seeps on the seafloor.

Hu and colleagues then defined a geographic area of the western Gulf and obtained MODIS images for the month of May for nine consecutive years (2000 to 2008) from NASA's Goddard Space Flight Center, Greenbelt, Md. The team reviewed more than 200 images containing sun glint, and found more than 50 with extensive oil slicks.

Exactly how much oil naturally seeps out of the seafloor is unknown, and most estimates are very crude because there has never been a proper global survey made for the public record. Researchers identified the natural seepage rate as a critical unanswered question when the National Academy of Sciences compiled its third Oil in the Sea report in 2003.

"This capacity for detecting oil in the ocean has great potential, not just for oil seeps but for responding to oil spills," said Chris Reddy, a marine chemist at the Woods Hole Oceanographic Institution in Massachusetts. "Scientists might be able to use this to forensically study old spills, to watch how new ones evolve in real time, and to rule out a spill when there is none. Ultimately, this could lead to a better use of our public resources."

The technique could be useful for detecting and monitoring oil spills from ships and other platforms, though Hu emphasized that the spills must be large enough (at least hundreds of meters or feet) to be visible in the MODIS imagery. If there is suspicion of a large human-caused spill, for instance, researchers would be able to review ocean imagery to see if the slick was present before the alleged spill, indicating a natural seepage. On the other hand, MODIS satellite imagery collected on a regular basis could help coastal managers track and mitigate the effects of large accidental spills.

The new method is not perfect, as cloud cover or a lack of sun glint can limit its use. Hu and colleagues suggest it may be best used as a complement to SAR, which penetrates cloud cover and can be tilted to get the necessary imaging angle.

"If you can get an image on a two- to three-day time frame and anywhere on the globe, that's pretty spectacular," said Reddy. "The first few days are critical to tracking oil in the ocean, so it helps to be able to use technology in real time to make informed decisions about cleanup."


Contact: Sarah DeWitt
NASA/Goddard Space Flight Center

Related biology news :

1. Marine scientists to assess environment before offshore drilling begins in US arctic waters
2. Scientists study full protein content of bakers yeast
3. Gladstone scientists reveal that fat synthesizing enzyme is key to healthy skin and hair
4. New target for medicine to combat Alzheimers: VIB scientists confirm proteins key role
5. Scientists to sequence DNA of British wheat varieties
6. Singapore-US scientists first to develop revolutionary microchip that uses 30 times less energy
7. Scientists deconstruct cell division
8. Scripps scientists create first crystal structure of an intermediate particle in virus assembly
9. Biotech scientists team with curators to stem decay of worlds art, cultural heritage
10. Federal scientists recognized for contributions to knowledge of bird ecology and habitat
11. Scientists can predict nano drug outcome
Post Your Comments:
(Date:9/26/2015)... 26th, 2015  Results of a TactioRPM pilot ... today at the Stanford Medicine X Conference. In ... Dashboards, Connected Health Devices and Pharmacogenomics", Roger ... will explain how senior patients equipped with connected ... pharmacist via the TactioRPM remote patient monitoring platform ...
(Date:9/24/2015)... September 24, 2015 ... 2015 Kerv ( ... lanserar idag världens första kontaktlösa betalningsring på ... 77 000 GBP för massproduktion via crowdfunding.  ... ) , Kerv-bärare kan göra ...
(Date:9/10/2015)... -- Report Details Emerging Biological Drugs ... Revenue Prospects to Help You Stay Ahead ... drug classes? Get the latest technological and commercial ... data and industry knowledge, benefitting your influence. And ... sales predictions. Visiongain,s new study reveals what,s ...
Breaking Biology News(10 mins):
(Date:10/13/2015)... Research and Markets( ) has announced the addition ... Morphogenetic Protein Growth Factor Therapy - 16 Countries (2011-2021)" ... --> Bone morphogenetic proteins (BMPs) are ... a fracture. In nature, these proteins have a critical ... skeleton. There are twenty different BMPs that have been ...
(Date:10/13/2015)... October 13, 2015 " Microbiology Culture ... 2015 - 2023 " , the global microbiology ... anticipated to reach US$7.59 bn by 2023, expanding at a CAGR ... --> " Microbiology Culture Market - Global Industry Analysis, ... , the global microbiology culture market was valued at ...
(Date:10/13/2015)... ... October 13, 2015 , ... AxioMx Inc. ... it has received a Phase I Small Business Innovative Research (SBIR) grant (1R43GM112204-01A1). ... General Medical Sciences (NIGMS), will fund the development of a technique to rapidly ...
(Date:10/13/2015)... 13, 2015      Q BioMed ... has entered into a strategic relationship with Wombat Capital, ... Paris, France based strategic and ... --> This collaborative arrangement gives Q BioMed and ... team as well as long established pharmaceutical industry relationships. ...
Breaking Biology Technology: