>
 
FishingBoating-World.com
 
 
News Home Newsletters Photo Gallery Powerboat-World Australian Cruising World Cruising MarineBusiness-World Animated Knots
MarineBusiness-World Animated Knots Video Gallery MarineBusiness-World
Sail-World.com : Scientist help to reveal deep-sea wave secrets
Scientist help to reveal deep-sea wave secrets


'Leif Thomas and Dan Whitt on board the R/V Knorr transiting the Gulf Stream'    Eric D'Asaro
Waves deep below the ocean surface assist in explaining how global currents work, and may improve climate predictions, according to scientists including a Stanford Woods Institute-affiliated researcher.

Stanford researchers Leif Thomas and Dan Whitt have discovered an undersea surf zone, where wind-spawned waves traveling as much as 500 meters below the sea surface break as they hit the boundaries between currents of differing density, such as cool subpolar and warm subtropical currents, causing the water carried by the currents to mix.

Their finding has ramifications for understanding how heat, salinity, and nutrients are transferred between currents and, by extension, globally. The new data should also aid in improving the physics behind computer models used to predict climate.

The ocean is multi-layered, with denser waters down deep and lighter waters near the surface. Cooler temperature and higher salinity both increase the density of water The density of a layer depends primarily on temperature and salinity. Internal waves – some extending laterally as much as several hundred kilometers – travel along the horizontal boundaries between layers of differing densities in an analogous way to how surface waves move on the air-sea boundary.

Thomas, a Stanford Woods Institute-affiliated assistant professor in the Department of Environmental Earth System Science (EESS), and Whitt, a doctoral candidate, developed a mathematical model analyzing how internal waves propagate in the ocean and interact with currents. Whitt is lead author of a paper describing their research that was published online by the American Meteorological Society’s Journal of Physical Oceanography.

Their model showed that when internal waves hit a current with a different density, they slow down and break, just as surface waves break when their progress is slowed by shallows, and mixing results.

'Strong ocean currents such as the Gulf Stream present ideal conditions for internal wave breaking,' Thomas said. 'We basically discovered a surf zone for these wind-driven internal waves.'

Last year on a research voyage funded by the Office of Naval Research, Thomas and Whitt observed preferential breaking of internal waves and enhanced turbulence along the Gulf Stream, where subpolar currents and subtropical currents meet, just as their theory predicted. They amassed ample data on internal waves and also on small scale, lateral, near-surface mixing in the upper 100 meters of the Gulf Stream. The next step in their research will be delving deeper into analyzing both forms of mixing and their impact on the large-scale ocean circulation and, by extension, climate. They are conducting their mathematical analyses of the data at the Center for Computational Earth and Environmental Science (CEES) in the School of Earth Sciences.

Stanford Woods website


by Stanford Woods Institute for the Environment

  

Click on the FB Like link to post this story to your FB wall

http://www.fishingboating-world.com/index.cfm?nid=108595

2:31 PM Fri 19 Apr 2013GMT


Click here for printer friendly version
Click here to send us feedback or comments about this story.







FishingBoating-World











































From Penguins to Polar Bears by Cherie Winner,






Polar research: Six priorities for Antarctic science by Mahlon C. Kennicutt II and colleagues,


















John Hemingway joins anglers for upcoming Wahoo Smackdown V
Dangerous conditions for boaters from this evening
Pacific Boating membership offers hassle-free boating *Feature
Marine15 expands trade, networking and B2B opportunities *Feature
2014 Auckland on the Water Boatshow - Huge prize packs up for grabs
Sustainable Seafood - How to purchase with confidence
4X4 Outdoors Show and Fishing and Boating Expo wows water lovers
Fishers encouraged to refresh knowledge of size and possession limits
Newly discovered Juvenile Whale Shark Aggregation in the Red Sea
Risks to penguin populations continues
Dangerous conditions for boaters from this afternoon
NSW Environment Minister awards 'Fish Friendly' Marina Accreditations
Gold Coast International Marine Expo - High-Diver Steve Black is back
Discover science of maritime exploration at National Maritime Museum
4x4 Outdoors Show, Fishing and Boating Expo - Campfire cooking corner
More than 1,000 jungle perch fingerlings reared
Don’t get in a tangle using illegal nets
See the heat with FLIR ONE *Feature
John Temple to retire, Will Sangster appointed General Manager
Multihull Central launches Aquila range at SIBS *Feature
Dredging link to WA coral disease   
Erin Loscocco, the foiling fisherman   
Sydney International Boat Show - Days 3 & 4 *Feature   
Endangered species are like Movie Stars - Charlie Sheens and Tom Hanks   
Shellfish reefs in Port Phillip Bay to be rejuvenated   
2014 Brisbane Boat Show - What's your trailer boat worth?   
Operation GrindStop 2014   
Big Dog Fat Cat Fishing Tournament - Big catches hauled in   
Sydney International Boat Show - Day 2 *Feature   
Marine Rescue volunteers celebrate new unit and $120,000 vessel   
Inspections increased by QBFP to safeguard fishing industry   
Sydney International Boat Show - images from Day 1 *Feature   
Pantaenius Insurance - being seen in yellow, green and orange *Feature   
Sydney International Boat Show begins!   
Sydney International Boat Show - Changed conditions on Sydney Harbour   
Fraser Island annual fishing closure starts August 1   
Gold Coast Broadwater no closer to welcoming supermaxis *Feature   
Sydney International Boat Show - all systems go!   
EOMAP modelling shows what's under our water   
Great Barrier Reef in a bad state, and getting worse   


For this week's complete news stories select    Last 7 Days
   Search All News
For last month's complete news stories select    Last 30 Days
   Archive News







Sail-World.com  


















Switch Default Region to:

Social Media

Asia

Australia

Canada

Europe

New Zealand

United Kingdom


http://www.sail-world.com/event_images/image/Twitter_logo_small.png http://www.sail-world.com/event_images/image/FaceBook-icon.png  http://www.sail-world.com/event_images/image/RSS-Icon.png

United States

Cruising Northern

Cruising Southern

MarineBusiness World

PowerBoat World

FishingBoating World

 

Contact

Commercial

News

Search

Contact Us

Advertisers Information

Submit news/events

Search Stories/Text

Feedback

Advertisers Directory

Newsletter Archive

Photo Gallery

 

Banner Advertising Details

Newsletter Subscribe

Video Gallery

Policies

 

 

 

Privacy Policy

 

 


Cookie Policy

 

 



This site and its contents are © Copyright TetraMedia and/or the original author, photographer etc. All Rights Reserved.  Photographs are copyright by law.  If you wish to use or buy a photograph contact the photographer directly.
XLXL NEW FBW
LocalAds   DE  ES  FR  IT