Summary of Abstract Submission

Abstract Submission No. IO50-04-0043PresentationPoster

UPWELLING TENDENCY OF THE ISOTHERMS ON THE SURFACE LAYER ALONG THE KERALA COAST

N.SRINIVASARAO*1, Krishnapriya M2, Geetha G1

1 INCOIS, INDIA
2 NRSC, INDIA

ABSTRACT :

The concepts of surface cooling and temperature inversions during north east monsoon period are thoroughly studied and reported by many researchers using in-situ and model observations. Researchers justified such phenomena has been formed due to the entrainment of Bay of Bengal waters into Arabian Sea. A case study has been presented in this work with a thrust of cold waters entrainment into Arabian Sea, is not only occurred due to Bay of Bengal cold waters, also, due to the river discharge influenced by NE Winter Monsoon. Satellite observations are considered near the river catchment area of Bharatphapuzha during last week of December 2012. This study has been pursued using SST of AVHRR & TMI and Ocean Color data of Oceansat-II OCM. A cold tongue has been observed during 19th December 2012 to 3rd January 2013 originated from the river mouth of Bharatphapuzha advected towards west with a spatial extent of 23053 Sq. Kms. Normally, river discharge is minimal during December along the Kerala Coast. But still significant river discharge can happen due to the influence of NE Monsoon. Rainfall in the catchment area could be confirmed using Cloud top temperatures (BT4) of AVHRR. The observed internal waves in the cold tongue clearly confirm the thermal inversions. This phenomenon seems to be an upwelling signature but it is not and can be confirmed with non-enhancement in chlorophyll-a concentration. The work is also extended to observe similar patterns during the period of December 2006, 2008 and 2011 over the study area.