Numerical simulation of the circulation within the Perth Submarine Canyon,Western Australia |
| |
| Authors: | Susan J Rennie Charitha B Pattiaratchi Robert D McCauley |
| |
| Institution: | 1. Oregon State University, College of Earth, Ocean and Atmospheric Sciences, 104 Ocean Admin. Bldg., Corvallis, OR 97331, USA;2. Camosun College, Department of Chemistry and Geoscience, Lansdowne Campus, 3100 Foul Bay Rd., Victoria, British Columbia V8P 5J2, Canada;3. Instituto Andaluz de Ciencias de la Tierra, Av. de las Palmeras, 418100 Granada, Spain;1. Université de Bordeaux, UMR 5805 EPOC, Allée Geoffroy Saint-Hilaire, 33615 Pessac Cedex, France;2. IFREMER, Centre de Brest, Plouzané, France;3. SHOM, Service Hydrographique et Océanographique de la Marine, 13 rue du Chatellier, 29200 Brest, France;4. BRGM Aquitaine, Parc Technologique Europarc, 24 Avenue Léonard de Vinci, Pessac 33600, France |
| |
| Abstract: | Surface and sub-surface currents along the ocean boundary of Western Australia were simulated using Regional Ocean Modelling System (ROMS) to examine the circulation within the Perth Canyon. Two major current systems influenced the circulation within the canyon: (1) The Leeuwin current interacted weakly with the canyon as the majority of the canyon was below the depth of the Leeuwin current and (2) Leeuwin undercurrent interacted strongly with the canyon, forming eddies within the canyon at depths of 400–800 m. The results indicated that within the canyon, the current patterns changed continuously although there were some repeated patterns. Recurrent eddies produced regions where upwelling or downwelling dominated during the model runs. Deep upwelling was stronger within the canyon than elsewhere on the shelf, but vertical transport in the upper ocean was strong everywhere when wind forcing was applied. Upwelling alone appeared to be insufficient to transport nutrients to the euphotic zone because the canyon rims were deep. Increased upwelling, combined with entrapment within eddies and strong upwelling-favourable winds, which could assist mixing, may account for the high productivity attributed to the canyon. The Leeuwin current is otherwise a strong barrier to the upwelling of nutrients. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
