Summary of Abstract Submission

Abstract Submission No. IO50-09-0078PresentationPoster

SPACE BASED OBSERVATION OF CHLOROPHYLL, SEA SURFACE TEMPERATURE, NITRATE AND SEA SURFACE HEIGHT ANOMALY OVER THE BAY OF BENGAL AND ARABIAN SEA

Dr.R.K.Sarangi*1, Dr.K.Nanthini Devi1

1 SAC,ISRO, India

ABSTRACT :

Monthly chlorophyll and sea surface temperature (SST) images have been generated using MODIS-Aqua datasets during 2014 for the Bay of Bengal and Arabian Sea water. The in situ data based modelled annual scale nitrate algorithm has been applied to generate nitrate images during 2014, using the satellite derived chlorophyll and SST images. To link ocean productivity with the sea surface features and sea level anomaly, the Indo-French altimeter mission SARAL-Altika derived sea surface height (SSH) anomaly datasets have been processed and maps generated. The monthly averaged chlorophyll concentration ranged 0.001-3.0 mg m-3, SST ranged 24-32C, nitrate ranged 0.01-6.0 μM and SSH anomaly ranged -52 to +40cm. Nitrate was observed to be high (3-5 μM) during December and January months possibly due to convective eddies and winter cooling effects. The nitrate concentration observed to be linked more to the chlorophyll than the SST, as nitrate inherently enhancing the ocean chlorophyll and productivity acting as proxy. The SSH anomaly has shown irregular features and depicting few eddies, upwelling and ocean circulation features. The low SSH anomaly has mostly been linked to high chlorophyll concentration over the Bay of Bengal and Arabian Sea. The low SST ~24-26C is observed to be related to high chlorophyll concentration (1.5-3.0 mg m-3) over the study area. The SSH anomaly has shown seasonal trend over the study area during monsoon period with observation of negative anomaly. The Arabian Sea has depicted with more negative SSH anomaly monthly mean values as compared to Bay of Bengal data.