Summary of Abstract Submission

Abstract Submission No. IO50-05-0055PresentationPoster

SPATIAL STRUCTURE OF THE INTRASEASONAL OSCILLATIONS OF SST AND OLR DURING INDIAN SUMMER MONSOON SEASON OVER THE ARABIAN SEA AND BAY OF BENGAL

CHARU SINGH*1, PANINI DASGUPTA2, VIDHI BHARTI1, ABHISEK DAS1

1 Indian Institute of Remote Sensing, ISRO, Dehradun, India
2 IITM, PUNE, India

ABSTRACT :

Prediction of the intraseasoal variability of the Indian summer monsoon (ISM) is much critical owing to its complex and chaotic nature at different temporal scales. Present study is an attempt to study the behaviour of the oceanic and atmospheric intraseasonal oscillations (ISOs) over the oceanic regions of the Indian summer monsoon domain. For this purpose, we make use of the long term TRMM Microwave Imager (TMI) SST and High Resolution Infrared Radiometer Sounder (HIRS) OLR over the Arabian Sea and Bay of Bengal for the past 16 years (1998-2013) of time period during the principal monsoon season (i.e. JJAS). Our analysis reveals that two major frequency bands corresponding to 10-20 days and 30-60 days duration are instrumental in both of the SST and OLR data sets. Out of these two modes, 30-60 days ISOs of OLR and SST demonstrate similar propagation characteristics over both of the Seas during the normal monsoon years whereas this characteristic of ISOs is not observed for 10-20 days mode. Preliminary results of this study are encouraging and supported by the statistically robust tests. Keywords: ISM, ISOs, SST, OLR, JJAS