PPT-ONR Sea State and Boundary Layer Physics of the Emerging Arctic

Ocean Directed Research Initiative The Sea State DRI will use a combination of modeling in situ observations and remote sensing to address the following science objectives Develop a sea state climatology for the Arctic . Pressure gradient is found from . freestream. (external) velocity . field. Boundary layer equation:. x. z. Effect of Pressure Gradient on the flow in a Boundary Layer. In the accelerating part of the stream,. . non-linear. . vortex. . structures. in the . Blasius. . boundary. . layer. flow. H. . Wedin. , G. Zampogna & A. . Bottaro. . DICCA, . University. of Genova, . Italy. … . including. a . . Drag force. The surrounding fluid exerts pressure forces and viscous forces on an object. .. The components of the resultant force acting on the object immersed in the fluid are the drag force and the lift force. . Convection in the boundary layer occurs to transport heat moisture, and momentum from surface to free atmosphere. Two common scenarios:. 1) Daytime solar heating 2) cold-air outbreaks, lake effect. -phase clouds cause climate model biases in Arctic wintertime temperature inversions. OBJECTIVE. We . show how the formation of Arctic air masses leads to the emergence of a cloudy and a clear state of the Arctic . INTRODUCTION. The Arctic is among the coldest, windiest and most remote places on the planet.. A vast area of . . frozen ice . William Ahue. University of Wisconsin – Madison. Dept. of Atmospheric and Oceanic Sciences. Department Seminar. 28. April 2010. Advisor:. Prof. Ankur Desai. What to Expect. Motivation and Background. NCAR is funded by the National Science Foundation. Richard . Rotunno. NCAR, Boulder CO. http://. www.mmm.ucar.edu/people/rotunno. /. Outline. Rotating Flow / No Boundary . Rotating Flow / Frictional Boundary Layer. Viscous effects confined to within some finite area near the boundary → . boundary layer. In unsteady viscous flows at low . Re. (impulsively started plate) the boundary layer thickness . δ. . grows with time. In a flow, the boundary layer represents a (relatively) thin layer of fluid that is nearest the solid boundary. 87-351 Fluid Mechanics. [ physical interpretation: what are we doing today? ]. The behaviour of the boundary layer is very different from that of the fluid above it. www.pwssc.org. What is the Arctic?. Area north of the Arctic Circle. Area north of the . treeline. Locations at high latitudes where the average daily summer temperature does not get above 10. . C. Sustainable cities and communities’ indicators for city services and quality of life to 46 Arctic cities. Partners: UVA, UNI, MIT, UAA, Moscow State, University of Helsinki and others. Outputs include a new database on Arctic cities and numerous publications examining the data and city case studies. . (4). . . Residual Layer . About a half . -. hour before sunset the thermals cease to form (in the absence of cold air advection), allowing turbulence to decay in the formerly well-mixed layer. The resulting layer of air is sometimes called the residual layer. . Arctic research at the University of Washington is spread across many departments, with hundreds of researchers working in fields that include cryosphere, atmosphere and ocean sciences, ecology and biological sciences, fisheries, policy, social sciences, and technology development..