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Scientific impacts of wind direction errors

Show simple item record Liu, W. Timothy Kim, Seung-Bum Lee, Tong Song, Y. Tony Tang, Wenqing Atlas, Robert 2005-08-30T14:58:17Z 2005-08-30T14:58:17Z 2004-05
dc.identifier.clearanceno JPL-PUB-04-08
dc.description.abstract An assessment on the scientific impact of random errors in wind direction (< 45°) retrieved from space-based observations under weak wind (< 7 m/s) conditions was made. Half of the winds over global oceans are below 7 m/s, in their long-term averages, and these weak winds cover most of the tropical, sub-tropical, and coastal oceans. Introduction of these errors in the semi-daily winds causes, on average, 5% changes of the yearly mean Ekman and Sverdrup volume transports computed directly from the winds, respectively. These poleward movements of water are the main mechanisms to redistribute heat from the warmer tropical region to the colder highlatitude regions, and they are the major manifestations of the ocean’s function in modifying Earth’s climate. Simulation by an ocean general circulation model shows that the wind errors introduce a 5% error in the meridional heat transport at tropical latitudes. The simulation also shows that the erroneous winds cause a pile-up of warm surface water in the eastern tropical Pacific, similar to the conditions during El Niño episode. Similar wind directional errors cause significant change in sea-surface temperature and sea-level patterns in coastal oceans in a coastal model simulation. Previous studies have shown that assimilation of scatterometer winds improves 3–5 day weather forecasts in the Southern Hemisphere. When directional information below 7 m/s was withheld, approximately 40% of the improvement was lost. en
dc.description.sponsorship JPL/NASA en
dc.format.extent 2638169 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004 en
dc.relation.ispartofseries JPL Publication en
dc.relation.ispartofseries 04-08 en
dc.subject remote sensing en
dc.subject winds en
dc.title Scientific impacts of wind direction errors en
dc.type Technical Report en

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