Seasonal variability of sea-surface temperature fronts associated with large marine ecosystems in the north Indian Ocean
We use 14 years of satellite-derived sea-surface temperature (SST) data to compute a monthly frontal probability index (FPI) to determine the existence of a front in a pixel. A persistent SST front is deemed to exist if the FPI in a narrow region exceeds that in the surrounding ocean. We describe the seasonal variability of 17 persistent SST fronts (eight associated with the shelf-slope boundary and five with the mixing between different water masses) in the north Indian Ocean. Only weak fronts exist during a few months in the strong upwelling regimes off Somalia and Oman.
KeywordsSST fronts frontal systems Arabian Sea Bay of Bengal potential fishing zones
Kankan Sarkar and Shrikant Dora acknowledge the Academy of Scientific and Innovative Research (AcSIR) and the financial support from the Council of Scientific and Industrial Research (CSIR), India. This research was supported by funds from CSIR under the OCEAN FINDER programme during 2012–2017 and TRIMFish from April 2017 onwards. MODIS Aqua SST data were downloaded from OceanColor group website; we are grateful to the OceanColor group for providing these data. The figures have been plotted using Ferret. This is CSIR–NIO contribution no. 6296.
- Belkin I M and Cornillon P 2007 Fronts in the world ocean’s large marine ecosystems; In: ICES CM 2007/D:21 (Comparative marine ecosystem structure and function: Descriptors and characteristics), International Council for the Exploration of the Sea (ICES).Google Scholar
- Böhm E, Morrison J M, Manghnani V, Kim H S and Flagg C N 1999 The Ras al Hadd Jet: Remotely sensed and acoustic Doppler current profiler observations in 1994–1995; Deep-Sea Res. II 46 1531–1549.Google Scholar
- Bruce J G 1968 Comparison of near surface dynamic topography during the two monsoons in the western Indian Ocean; Deep-Sea Res. 15 665–677.Google Scholar
- Evans R H and Brown O B 1981 Propagation of thermal fronts in the Somali current system; Deep-Sea Res. 28 521–527.Google Scholar
- Maul G A, Williams F, Roffer M and Sousa F M 1984 Remotely sensed oceanographic patterns and variability of bluefin tuna catch in the Gulf of Mexico; Oceanol. Acta 7 469–479.Google Scholar
- Sarkar K, Aparna S G and Shankar D 2015 Sea surface temperature fronts in the NIO; In: National conference on exploring advances in mathematics, Department of Mathematics, University of Gour Banga, West Bengal, India.Google Scholar
- Vipin P, Sarkar K, Aparna S G, Shankar D, Sarma V V S S, Gracias D G, Krishna M S, Srikanth G, Mandal R, Rao E P R and Rao N S 2015 Evolution and sub-surface characteristics of a sea-surface temperature filament and front in the northeastern Arabian Sea during November–December 2012; J. Mar. Syst. 150 1–11; https://doi.org/10.1016/j.jmarsys.2015.05.003.CrossRefGoogle Scholar