On the Temporal Distribution of Bursts and Events in the Stable Marine Atmospheric Surface Layer |
| |
| Authors: | George D Katsouvas Costas G Helmis |
| |
| Institution: | (1) Department of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, University Campus, Building Phys.-5, 15784 Athens, Greece |
| |
| Abstract: | A methodology for tracing the bursting phenomenon occurring in the turbulent boundary-layer is applied to stable marine atmospheric
boundary-layer (MABL) data, collected within the framework of the Coupled Boundary Layer Air-Sea Transfer, Low wind component
experiment at Nantucket Island, 2003, Massachusetts, USA. For the definition of the events contributing to the bursting phenomenon,
the quadrant analysis of the momentum flux with varying threshold value is utilized. The present work aims at the better understanding
of the time scales of the microstructures in the MABL, by providing the number of the events and the groups and their mean
duration and the time difference of all quadrants of the quadrant analysis, for different thresholds and under different meteorological
conditions. The interrelation of the different time scales as well as the correlation between the quadrants are investigated
and discussed. Also, it is demonstrated that the procedure of grouping events leads to bursts with a mean duration that is
independent of the threshold value, for the most important quadrants of the momentum transfer (2 and 4). It is found that
the combination of near-neutral conditions with low wind speed permits the development of larger duration events within the
stable MABL. Finally, it is shown that the groups of events maintain adequate time and flux coherence only for quadrants 2
and 4. |
| |
| Keywords: | Bursts Events Marine atmospheric boundary layer Momentum flux Quadrant analysis |
| 本文献已被 SpringerLink 等数据库收录！ |
|
