+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Fu, Lee-Lueng  NASA Center > Jet Propulsion Laboratory  Publication Year > 2001-2010 > 2007  Subject > M-O > Oceanography  Availability Options > Online > PDF  Item/Media Type > Journal Article  Note: Start a new navigation search by selecting a link above     + Back to Results   + Printer Friendly Title: Intraseasonal Variability of the Equatorial Indian Ocean Observed from Sea Surface Height, Wind, and Temperature Data Author(s): Fu, Lee-Lueng Abstract: The forcing of the equatorial Indian Ocean by the highly periodic monsoon wind cycle creates many interesting intraseasonal variabilities. The frequency spectrum of the wind stress observations from the European Remote Sensing Satellite scatterometers reveals peaks at the seasonal cycle and its higher harmonics at 180, 120, 90, and 75 days. The observations of sea surface height (SSH) from the Jason and Ocean Topography Experiment (TOPEX)/Poseidon radar altimeters are analyzed to study the ocean's response. The focus of the study is on the intraseasonal periods shorter than the annual period. The semiannual SSH variability is characterized by a basin mode involving Rossby waves and Kelvin waves traveling back and forth in the equatorial Indian Ocean between 10(deg)S and 10(deg)N. However, the interference of these waves with each other masks the appearance of individual Kelvin and Rossby waves, leading to a nodal point (amphidrome) of phase propagation on the equator at the center of the basin. The characteristics of the mode correspond to a resonance of the basin according to theoretical models. The theory also calls for similar modes at 90 and 60 days. NASA Center: Jet Propulsion Laboratory Publication Date: February 27, 2007 Document Source: Other Sources Online Source: Link to Data Provider's Site for Detailed Information   Link to Data Provider's Site for Detailed Information Document ID: 20070032962 Publication Information: Journal of Physical Oceanography, Volume 37, 188-202, Number of Pages = 15 Keywords: INDIAN OCEAN; SHEAR STRESS; REMOTE SENSING; OCEAN SURFACE; WIND SHEAR; SATELLITE OBSERVATION; wind stress observations; sea surface height (SSH); Ocean Topography Experiment (TOPEX)/Poseidon; intraseasonal periods; Indian Ocean; wind forcing; KELVIN WAVES; GROUND WIND; EQUATORS; TOPOGRAPHY; Accessibility: Unclassified; Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2007-11-22 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007