OHP–APT 2002 gravity wave campaign: waves,turbulence and forecasts |
| |
Authors: | George Y Jumper Edmund A Murphy Frank H Ruggiero John R Roadcap Anthony J Ratkowski Jean Vernin Hervé Trinquet |
| |
Institution: | (1) AFRL/VSBYA, Hanscom AFB, MA 01731-3010, USA;(2) Hanscom AFB, MA 01731-3010, USA;(3) L.U.A.N., Université de Nice-Sophia Antipolis, UMR 6525, F-06108 Nice Cedex 2, France |
| |
Abstract: | In July 2002, a multi-sensor campaign was conducted in southern France to investigate the hypothesized connection between
gravity waves and optical turbulence. A generalized scidar (GS) was mounted on the 1.93 m diameter telescope at l’Observatoire
de Haute-Provence (OHP). The GS provides continuous profiles of optical turbulence with 300 m vertical resolution from telescope
altitude up to 25 km. Thermosondes, which provide in situ measurement of optical turbulence by measuring temperature variance,
were launched at the OHP site and at a site approximately 20 km west-northwest of OHP. Gravity wave activity was deduced from
temperature and wind velocity measured by radiosondes, which are part of the thermosonde system. In this paper, gravity waves
were analyzed using techniques for simple two-dimensional mountain waves, with only fair results. Mesoscale models were run
at moderately high resolution for the period. The forecasts were analyzed for wave activity, and a post processor model was
used to diagnose the optical turbulence. Mountain waves were evident in the forecast, but quantitative comparison showed the
forecast to be inadequate in predicting wave strength. The forecast optical turbulence was in fair agreement with measurements
with notable exceptions.
This paper is declared a work of the U.S. Government and is not subject to copyright protection in the United States. The
U.S. Government’s right to retain a non-exclusive, royalty-free license in and to any copyright is acknowledged.
Presented at the Turbulence and Waves in Stably Stratified Atmospheric Shear Flows: Measurements, High Resolution Simulations
and Numerical Prediction Challenges Conference, 13–15 September 2004, Lighthill Institute of Mathematical Sciences, University
College London, London, UK. |
| |
Keywords: | Atmospheric turbulence Thermosonde Generalized scidar Gravity waves |
本文献已被 SpringerLink 等数据库收录! |
|