The variability of the large-amplitude internal wave field on the Australian North West Shelf |
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| Authors: | Paul Van Gastel Gregory N Ivey Michael J Meuleners Jason P Antenucci Oliver Fringer |
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| Institution: | 1. School of Environmental Systems Engineering, University of Western Australia, Crawley, Western Australia 6009, Australia;2. Centre for Water Research, University of Western Australia, Crawley, Western Australia 6009, Australia;3. Department of Civil and Environmental Engineering, Stanford University, Palo Alto, CA, USA;1. Department of Marine Environment and Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, ROC;2. Honorary Research Fellow, School of Civil and Resource Engineering, University of Western Australia, Crawley, WA 6009, Australia;1. Arctic and Antarctic Research Institute, St. Petersburg, Russia;2. Centre for Earth Observation Science at the University of Manitoba, Winnipeg, Canada;3. Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany;4. Helmholtz Centre for Ocean Research, Kiel, Germany;1. Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, 310 Allée des Ursulines, Rimouski, QC, Canada G5L 3A1;2. Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via G. Saragat 1, 44100 Ferrara, Italy;3. Woods Hole Oceanographic Institution, 266 Woods Hole Rd, MS# 21, Woods Hole, MA 02543-1050, USA;4. Dalhousie University, Department of Oceanography, 1355 Oxford Street PO BOX 15000, Halifax, NS, Canada B3H 4R2 |
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| Abstract: | Observations are presented of large-amplitude internal waves (LAIWs) generated by the steepening of the internal tide on the Australian North West Shelf (NWS) over a 4-month period extending from strongly stratified summer conditions to weakly stratified winter conditions. The observations are from a site in water depth of 124 m where current and temperature measurements were made from a fixed vertical mooring and a benthic L-shaped spatial array. The observations show the LAIWs at this site to be characterized by strong seasonal variability, with energetic LAIWs of depression being dominant during summer and weaker LAIWs of elevation being dominant during the winter months as the stratification weakens, the upper mixed layer deepens, and the thermocline is close to the bottom. Waves were also seen to propagate from a range of directions towards the observation site. Modeling using the Regional Ocean Modeling System (ROMS v2.1) revealed that internal tide generation in the area occurred at water depths of between 400 and 600 m along an arc of approximately 120 km in length, some 70 km to the northwest of our experimental site. The results demonstrate both the 3D nature as well as the seasonal variation of the LAIW field. |
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