NDLI: Indian Ocean surface winds from NCMRWF analysis as compared to QuikSCAT and moored buoy winds

Content Provider	Springer Nature Link
Author	Goswami, B. N. Rajagopal, E. N.
Copyright Year	2003
Abstract	The quality of the surface wind analysis at the National Centre for Medium Range Weather Forecasts (NCMRWF), New Delhi over the tropical Indian Ocean and its improvement in 2001 are examined by comparing it within situ buoy measurements and satellite derived surface winds from NASA QuikSCAT satellite (QSCT) during 1999, 2000 and 2001. The NCMRWF surface winds suffered from easterly bias of 1.0–1.5 ms$^{-1}$ in the equatorial Indian Ocean (IO) and northerly bias of 2.0–3.0 ms$^{-1}$ in the south equatorial IO during 1999 and 2000 compared to QSCT winds. The amplitude of daily variability was also underestimated compared to that in QSCT. In particular, the amplitude of daily variability of NCMRWF winds in the eastern equatorial IO was only about 60% of that of QSCT during 1999 and 2000. The NCMRWF surface winds during 2001 have significantly improved with the bias of the mean analyzed winds considerably reduced everywhere bringing it to within 0.5 ms$^{-1}$ of QSCT winds in the equatorial IO. The amplitude and phase of daily and intraseasonal variability are very close to that in QSCT almost everywhere during 2001. It is shown that the weakness in the surface wind analysis during 1999 and 2000 and its improvement in 2001 are related to the weakness in simulation of precipitation by the forecast model in the equatorial IO and its improvement in 2001.
Starting Page	61
Ending Page	77
Page Count	17
File Format	PDF
ISSN	02534126
Journal	Journal of Earth System Science
Volume Number	112
Issue Number	1
e-ISSN	0973774X
Language	English
Publisher	Springer India
Publisher Date	2003-01-01
Publisher Institution	Indian Academy of Sciences
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Equatorial Indian Ocean ocean surface forcing NCMRWF analysed winds scatterometer winds Geosciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	1900/1901

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