Debasis Sengupta & Retish Senan -...
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A biweekly mode in the equatorial Indian Ocean
Debasis Sengupta & Retish SenanCenter for Atmospheric and Oceanic Sciences
Indian Institute of Science, Bangalore
V. S. N. Murty & V. FernandoNational Institute of Oceanography, Goa
IOM, 1 Dec 2004
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Kuroda, 2000
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10-60 day current is strong in the equatorial waveguide; it is mostly wind forced
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ZONAL VELOCITY 0° 90°E
OBS (MASUMOTO, 2004)
MODEL
2001 2002
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ZONAL VELOCITY 0° 90°EOBS
MODEL
2002 2003
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JASON
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Kuroda 2000
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Schott et al., 1994, JGR
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Off-eq. u
Eq. v
Reppin et al., 1996; Schott & McCreary, 2001
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v variability: mainly 14-day Yanai waves at all depths + 30-60 day ?? below ~150m
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93°E NIO Obs and ModelTop subsurface marker float at 70m
Glass floats
RCM 7, 106m
RCM 7, 264m
RCM 8, 462m
RCM 8, 966m
Glass floats
RCM 8, 1962m
RCM 11, 3968m
Glass floats
Dual MORS Acoustic release
Anchor 1250 Kgs, 4482m
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From NIO Observations
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~3,300 km
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~4 m/s
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10-18 day Model v 1oS-1oN
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SPACE-TIME SPECTRUM τy
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QBO: Chatterjee & Goswami, 2004 QJRMS
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SPACE-TIME SPECTRUM
v 50m
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SPACE-TIME SPECTRUM
v 500m
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Rossby wave dispersion curve c=15 ms-1
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Yanai wave dispersion curve c=2.1 ms-1
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VSN Murty NIO
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Chavez et al., 1999
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CONCLUSIONS
! Accurate winds give good model currents – currents are deterministic away from the western boundary.
! Observed currents have distinct biweekly variability. The model simulates this, but not the 30-60 day v variability.
! The biweekly mode is a westward propagating Yanai wave with ~14 day period and 3000-4500 km wavelength, resonantly forced by the atmospheric quasi-biweekly mode.
! The biweekly wave is associated with intermittent, off-equator upwelling/downwelling (1-8 metres per day) throughout the year.
! Upwelling followed by mixing is an irreversible process. The biweekly mode might influence subsurface temperature and biology.
Subseasonal variability might influence seasonal and longer time scale changes in Indian Ocean currents, SST and Climate
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Accelerations ~10-8 g
u variability: Eq. Jets + Rossby & Kelvin waves from boundaries
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Meridional Current (cm/s)
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rms diff = 0.68
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MODEL BASIC EQUATIONS
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MODEL DOMAIN AND GRID
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CONCLUSIONS
! Climate in our region is made of 10-60 day intraseasonal events
! These climate events probably involve air-sea-land interaction
! Intraseasonal events are likely to be predictable 15-25 days
ahead (Waliser, Goswami, Webster, Hendon, Wheeler … )
! Understanding of intraseasonal air-sea-land interaction will improve in the next few years