A note on the deficiency of NCEP/NCAR reanalysis surface winds over the equatorial Indian Ocean

Details A note on the deficiency of NCEP/NCAR reanalysis surface winds over the equatorial Indian Ocean A note on the deficiency of NCEP/NCAR reanalysis surface winds over the equatorial Indian Ocean

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgrc..108.3124g&link_type=abstract

Journal of Geophysical Research (Oceans), Volume 108, Issue C4, pp. 21-1, CiteID 3124, DOI 10.1029/2002JC001497

Physics

11

Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions (0312, 4504), Meteorology And Atmospheric Dynamics: Tropical Meteorology, Oceanography: General: Equatorial Oceanography, Information Related To Geographic Region: Indian Ocean

Scientific paper

The seasonal cycle and intraseasonal variability of the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP) reanalysis surface winds over the Indian Ocean (IO) are assessed by comparing them with in situ surface observations from two moored buoys and winds from the SeaWinds scatterometer on the QuikSCAT satellite. The buoys are located in the central Bay of Bengal and eastern Arabian Sea. Both QuikSCAT and NCEP wind products reproduce closely the seasonal cycle and intraseasonal variability (10-60 day) in the in situ observations. In the equatorial IO, however, the seasonal mean NCEP wind speeds can be 2-3 m s -1 smaller and the amplitude of intraseasonal variability only about half that of QuikSCAT winds. The systematic errors of NCEP zonal winds are comparable to the annual mean or amplitude of the seasonal cycle in the equatorial IO. It is suggested that the systematic error of mean and intraseasonal variability of reanalysis winds is related to systematic error in the NCEP analysis of precipitation.

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