Open Access Atmos. Chem. Phys., 14, 641–658, 2014 Atmospheric www.atmos-chem-phys.net/14/641/2014/ doi:10.5194/acp-14-641-2014 Chemistry © Author(s) 2014. CC Attribution 3.0 License. and Physics Observation and a numerical study of gravity waves during tropical cyclone Ivan (2008) F. Chane Ming1, C. Ibrahim1, C. Barthe1, S. Jolivet2, P. Keckhut3, Y.-A. Liou4, and Y. Kuleshov5,6 1Université de la Réunion, Laboratoire de l’Atmosphère et des Cyclones, UMR8105, CNRS-Météo France-Université, La Réunion, France 2Singapore Delft Water Alliance, National University of Singapore, Singapore, Singapore 3Laboratoire Atmosphères, Milieux, Observations Spatiales, UMR8190, Institut Pierre-Simon Laplace, Université Versailles-Saint Quentin, Guyancourt, France 4Center for Space and Remote Sensing Research, National Central University, Chung-Li 3200, Taiwan 5National Climate Centre, Bureau of Meteorology, Melbourne, Australia 6School of Mathematical and Geospatial Sciences, Royal Melbourne Institute of Technology (RMIT) University, Melbourne, Australia Correspondence to: F. Chane Ming (
[email protected]) Received: 3 December 2012 – Published in Atmos. Chem. Phys. Discuss.: 24 April 2013 Revised: 21 November 2013 – Accepted: 2 December 2013 – Published: 22 January 2014 Abstract. Gravity waves (GWs) with horizontal wavelengths ber 1 vortex Rossby wave is suggested as a source of domi- of 32–2000 km are investigated during tropical cyclone (TC) nant inertia GW with horizontal wavelengths of 400–800 km, Ivan (2008) in the southwest Indian Ocean in the upper tropo- while shorter scale modes (100–200 km) located at northeast sphere (UT) and the lower stratosphere (LS) using observa- and southeast of the TC could be attributed to strong local- tional data sets, radiosonde and GPS radio occultation data, ized convection in spiral bands resulting from wave number 2 ECMWF analyses and simulations of the French numerical vortex Rossby waves.