Sunday, 13 September 2009

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Transactions: WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT
Transactions ID Number: 29-689
Full Name: Costas Helmis
Position: Professor
Age: ON
Sex: Male
Address: Dep. of Physics, University of Athens, University Campus, Building Phys.-5, 15784, Athens
Country: GREECE
Tel: 210 7276927
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E-mail address: chelmis@phys.uoa.gr
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Title of the Paper: On the temporal evolution of the vertical momentum fluxes within the Marine Atmospheric Boundary Layer
Authors as they appear in the Paper: Costas Helmis
Email addresses of all the authors: chelmis@phys.uoa.gr
Number of paper pages: 10
Abstract: In the frame of the CBLAST-Low project, the vertical structure of the Marine Atmospheric Boundary Layer (MABL) was studied using remote and in situ sensing instrumentation at the southern coast of the Nantucket Island, MA, USA, during 2003. Since a Low-Level Jet (LLJ) was frequently observed at low heights, it is of interest to examine the modification of the vertical transport of momentum fluxes and the possible influence on the vertical structure of the Turbulent Kinetic Energy (TKE). Thus two cases of a LLJ development (the 3rd and the 7th of August 2003) were examined, regarding the momentum transport and the standard deviation of the vertical component of the wind profiles which is related with the TKE. According to this study an intense modification of the vertical profiles of momentum fluxes and TKE was evident mainly above the LLJ core, following the temporal evolution of the developed LLJ. This fact modifies the vertical turbulent structure of the marine A!
tmospheric Boundary Layer as well as the expected levels of TKE values
Keywords: Momentum flux, Marine atmospheric boundary layer, Turbulent kinetic energy, Sodar, Low level jet
EXTENSION of the file: .doc
Special (Invited) Session: Momentum fluxes estimation within the Marine Atmospheric Boundary Layer
Organizer of the Session: 626-323.doc
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