Summary of Abstract Submission

Abstract Submission No. IO50-02-0011PresentationOral

CHLOROPHYLL-A PROFILES IN THE INDIAN OCEAN - COMPARISON BETWEEN OBSERVATIONS COLLECTED DURING THE IIOE-1 AND IN THE PRESENT DECADE

Shalin S*1, Trevor Platt2, Nandini Menon1, Shubha Sathyendranath2, Annette Samuelsen3, N. R. Menon1

1 Nansen Environmental Research Centre, India
2 Plymouth Marine Laboratory, United Kingdom
3 Nansen Environmental and Remote Sensing Center, Norway

ABSTRACT :

Under climate change, physical conditions in the Indian Ocean are being modified. Here we explore possible consequences for a fundamental biological property, namely the vertical structure of the chlorophyll field. Areas of similar features of the study area were identified by applying Principal Component Analysis (PCA) and Cluster Analysis (CA) using monthly climatologies of chlorophyll-a extracted from data collected by the satellite sensor MODIS-AQUA. Vertical structure of chlorophyll during IIOE-1 and the present decade was compared in each of the areas so identified. Chlorophyll variability (past and present) within these areas was then related to prevailing physical factors such as wind and mixed-layer depth (MLD). Wind data were obtained from National Centres Environmental Prediction / National Centre for Atmospheric Research reanalysis, and MLD was calculated from temperature profiles. Potential implications for primary production are discussed.