4. Title and Subtitle. 5. Funding Numbers. Turbulent Transport from an Arctic Lead: A Large-Eddy Simulation Contract Program Element No. 0601153N

• Main Authors: Pu Ad-a, Tion Pageft O, John W. Glendening, Stephen D. Burk Task No, Wok Unt No. A
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Arctic
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.469.6980; http://www.dtic.mil/dtic/tr/fulltext/u2/a254396.pdf

Approved for public release; distribution is unlimited. 13. Abstract (Maximum 200 words). The upward transfer of heat from ocean to atmosphere is examined for an Arctic "lead, " a break in the Arctic ice which allows contact between the cold atmosphere and the relatively warm ocean. We employ a large-eddy modelto compute explicitly the three-dimensional turbulent response of the atmosphere to a lead of 200 m width. The surface heat flux creates a turbulent "plume " of individual quasi-random eddies, not a continuous updraft, which penetrate into the stable atmosphere and transport heat upward. Maximum updraft velocities and turbulence occur downwind of the lead rather than over the lead itself, because the development time of an individual thermal eddy is longer than its transit time across the lead. The affected vertical region, while shallow over the lead itself, grows to a height of 65 m at 600 m downwind of the lead; beyond that, the depth of the turbulent region decreases as