On the Vertical Structure and Spectral Characteristics of the Marine Low-Level Jet

  • C. G. Helmis
  • G. Sgouros
  • Q. Wang
Conference paper
Part of the Springer Atmospheric Sciences book series (SPRINGERATMO)


The aim of this work is the study of the vertical turbulent structure and the spectral characteristics of the marine Low Level Jet (LLJ). The analyzed data are based on SODAR and in-situ instrumentation measurements, performed during summer 2003, in the frame of the Coupled Boundary Layers Air-Sea Transfer Experiment in Low Winds (CBLAST-Low), at Nantucket Island, MA, USA. The study of vertical profiles of the wind speed and temperature reveal the frequent development of marine LLJs, a modification of thermal stratification of the vertical structure of the marine Atmospheric Boundary Layer (MABL) and strengthening of LLJs depending on the meteorological conditions. In order to reveal the distribution of the intensity of wind variations in time scales corresponding to different physical processes, the Hilbert-Huang Transform (HHT) was applied to time series of the wind data from ground observations and SODAR data at different levels. Results are presented and discussed for a case study where the observed LLJ was formed on the top of the temperature inversion. It was persistent for several hours and the analysis of the wind speed data showed high amplitudes corresponding to contributions from the inertial motions but also from processes with a variety of time-scales.


Intrinsic Mode Function Inertial Motion Inertial Oscillation Marine Atmospheric Boundary Layer Intrinsic Mode Function Component 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Department of Environmental Physics and MeteorologyUniversity of AthensAthensGreece
  2. 2.Department of MeteorologyNaval Postgraduate SchoolMontereyUSA

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