INTRASEASONAL VARIABILITY OF THE EQUATORIAL INDIAN OCEAN CIRCULATION. RETISH SENAN. Centre for Atmospheric and Oceanic Sciences Indian Institute of Science Bangalore. OBSERVATIONS OF INTRASEASONAL VARIABILTY. Gan Island 73 ° E EQ. South of Sri Lanka 80.5 ° E. OBJECTIVES.
EQUATORIAL INDIAN OCEAN CIRCULATION
Centre for Atmospheric and Oceanic Sciences
Indian Institute of Science
Gan Island 73°E EQ
South of Sri Lanka 80.5°E
Masumoto et al., Presented at IOGOOS conference, Mauritius, 2002; GRL (submitted).
T= 4 - 6C
OLR-SST LEAD-LAG REGRESSION ATMOSPHERE
CONCLUSIONS (Contd…) ATMOSPHERE
Sengupta, D., R. Senan and B. N. Goswami (2001): Origin of Intraseasonal variability of circulation in the tropical central Indian Ocean. Geophysical Research Letters, 28, 7, 1267-1270. Sengupta, D., B. N. Goswami and R. Senan (2001): Coherent Intraseasonal oscillations of the ocean and atmosphere during the Asian summer monsoon. Geophysical Research Letters, 28, 21, 4127-4130.
Senan, R., D. Sengupta and B. N. Goswami (2003): Intraseasonal "monsoon jets" in the equatorial Indian Ocean. Geophysical Research Letters, 30, 14, 1750, doi:10.1029/2003GL017583. Sengupta, D., R. Senan, V. S. N. Murty and V. Fernando (2004): A biweekly mode in the equatorial Indian Ocean. Journal ofGeophysical Research (under revision).Sengupta, D., R. Senan and B. N. Goswami (2004): Variability of equatorial Indian Ocean circulation. In preparation.
Current spectra at 80 ATMOSPHERE°E
From Reppin, Schott, Fischer and Quadfasel, JGR, 1999.
MODEL BASIC EQUATIONS ATMOSPHERE
Generation of Equatorial Jets ATMOSPHERE
Why does the eastward jet decelerate in the presence of persistent westerly wind stress?
Why are the jets followed by westward flow in the upper ocean?
Why are the spring and fall jets followed, about three months later, by eastward “undercurrents”?
Amplitude of Seasonal Cycle persistent westerly wind stress?