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Scientific Impacts of Wind Direction ErrorsAn assessment on the scientific impact of random errors in wind direction (less than 45 deg) retrieved from space-based observations under weak wind (less than 7 m/s ) conditions was made. 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 high- latitude 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 Nino 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
Document ID
20050185098
Document Type
Other
Authors
Liu, W. Timothy (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kim, Seung-Bum (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lee, Tong (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Song, Y. Tony (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Tang, Wen-Qing (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Atlas, Robert (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 7, 2013
Publication Date
May 5, 2004
Subject Category
Meteorology and Climatology
Report/Patent Number
JPL-04-08
Funding Number(s)
PROJECT: JPL Proj. 100929
CONTRACT_GRANT: NAS7-03001
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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