EOL Seminar: Turbulence characteristics of downslope flows in mountainous terrain

Date: 
Tuesday, August 16, 2016 - 15:30 to 16:30
Location: 
FL2-1001 Small Seminar Room
Contact Name: 
Steve Oncley
Contact Email: 
Contact Phone: 
8757

 

Turbulence characteristics of downslope flows in mountainous terrain
 

Dr. Ivana Stiperski,

Institute of Atmospheric and Cryospheric Sciences

University of Innsbruck


Orography presents a significant forcing to the atmosphere above and around it

spanning a wide range of scales, from large scale to turbulence. In mountainous

terrain turbulence is by definition considered to be heterogeneous inhibiting efforts of

developing a unified similarity theory for complex terrain. This heterogeneity of

turbulence stems from local surface characteristics such as changes in slope angle and

vegetation cover and inhomogeneity in the thermal forcing as well as different type of

dynamic forcing: under low synoptic forcing thermally driven flows develop in

mountain valleys and on the slopes whereas under strong synoptic forcing downslope

windstorm-type flows can develop.

 

In this contribution we will present results from long-term turbulence measurements

from the Inn Valley, Austria, as part of i-Box project, together with short-term

turbulence measurements during the Metcrax II field campaign in Winslow Meteor

Crater in Arizona. We will examine turbulence characteristics in mountainous terrain

of different slope angle and surface characteristics and will focus on the difference

between the turbulence generated by katabatic winds and downslope windstorms and

heterogeneity induced by these flows.

 

Seminar will be webcast at: http://www.fin.ucar.edu/it/mms/fl2-live.htm‚Äč

 

Tuesday, 16 August 2016, 3:30 PM

Refreshments 3:15 PM

NCAR-Foothills Laboratory

3450 Mitchell Lane

Bldg 2 Small Seminar Room (Rm1001)