Summary of Abstract Submission

Abstract Submission No. IO50-08-0006PresentationPoster

INTRASEASONAL AND INTERANNUAL VARIABILITY OF SATELLITE DERIVED OCEAN SURFACE CURRENTS IN THE INDIAN OCEAN

Rajesh Sikhakolli*1, Rashmi Sharma1, R. M. Gairola1, Raj Kumar1

1 Space Applications Centre, ISRO, Ahmedabad, INDIA

ABSTRACT :

Monitoring the variations of ocean surface currents globally is extremely important for various operational applications such as naval applications, ship routing and oil spill monitoring apart from their significant contribution in climate studies due to their heat and salt transportation capacity. At present there is no demonstrated satellite technology that can provide this information operationally on a global scale. Nevertheless, various researchers have demonstrated that the ocean surface current information can be generated using other satellite derived parameters such as, sea level (SLA) data from altimeters, wind data from scatterometers/microwave radiometers and sea surface temperature (SST) data from radiometers by combining the geostrophic component from altimeter data and the ageostrophic component from scatterometer and radiometer data. Motivated by the recently available daily SLA data from AVISO and merged scatterometer/radiometer wind product by CCMP project we have developed an algorithm in similar lines to OSCAR for daily ocean surface current generation using AVISO SLA, CCMP vector wind and Reynolds SST data for the last two decades (1993-2013). In this study the evaluation of this product using RAMA buoy data is presented. These comparisons with RAMA buoy data have shown that the generated current product is able to capture the high frequency variability of currents in the Indian Ocean with a reasonable accuracy (Correlation > 0.7 away from equator). Moreover, results of intraseasonal and interannual variability major current systems in the Indian Ocean is also presented.