Detection of Phytoplankton Blooms in the Turbid Coastal Waters Using Satellite-Derived Fluorescence Line Height off Kakinada Coast
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Fluorescence line height (FLH) is a relative measure of the amount of radiance leaving the sea surface in the chlorophyll fluorescence emission band. Satellite-derived FLH images provide information about the surface chlorophyll distribution which in turn can be used for monitoring surface phytoplankton blooms in coastal waters. The present study aims at observing a phytoplankton bloom in the Kakinada coastal waters along the east coast of India using nFLH product of MODIS-A. This quasi-permanent bloom could not be precisely observed using chlorophyll concentration in the turbid coastal waters due to the presence of other optically active constituents; hence, chlorophyll fluoresce is used to study the bloom phenomenon from nFLH product of MODIS. The analysis has been carried out by analysing the spectral variability using both in situ and satellite Rrs spectra over the bloom and non-bloom waters. Comparative study between in situ chlorophyll with satellite-derived FLH showed a good correlation with an R2 of 0.43. The bloom phenomenon observed/assessed from the MODIS nFLH data showed > 0.25 W m−2 sr−1 μm in the bloom-dominated pixels. This proves that the satellite-derived nFLH can also be used as an indicator in detecting the phytoplankton blooms and also as one of the important parameters for the ocean colour applications in case-II waters.
KeywordsMODIS-A nFLH Phytoplankton bloom
The authors would like to thank Dr. Shantanu Choudhury, Director, National Remote Sensing Centre (NRSC), and Dr. M. V. R. Sesha Sai, Deputy Director, Earth and Climate Science Area (ECSA). Thanks are also due to all the participants of the cruise and their respective collaborative support institutions for extending their support to carry out the experiments. This work is supported under NICES programme. We thank the anonymous reviewers for providing comments that helped to improve the quality of the original manuscript.
- Abbott, M. R., & Letelier, R. M. (1999). Algorithm theoretical basis document chlorophyll fluorescence (MODIS product number 20). NASA. http://www.modis.gsfc.nasa.gov/data/atbd. Accessed 7 Aug 2019.
- Gunther, K., Ernst, D., & Maske, H. (1986). Biophysical processes of chlorophyll a fluorescence. In The use of chlorophyll fluorescence measurements from space for separating constituents of sea water (ESA Contract No. RFQ 3-5059/84/NL/MD, Volume II). Geesthacht, F.R. Germany: GKSS-Forschungszentrum Geesthacht.Google Scholar
- Hu, C., Cannizzaro, J., Carder, K., Lee, Z. P., Muller-Karger, F. E., & Soto, I. (2011). Red tide detection in the eastern Gulf of Mexico using MODIS imagery. In Handbook of satellite remote sensing image interpretation: applications for marine living resources conservation and management (pp. 95–110).Google Scholar
- Nagamani, P. V., Latha, T. P., Rao, K. H., Suresh, T., Choudhury, S. B., Dutt, C. B. S., et al. (2015). Setting of cloud albedo in the atmospheric correction procedure to generate the ocean colour data products from OCM-2. Journal of the Indian Society of Remote Sensing, 43(2), 439–444.CrossRefGoogle Scholar
- Pegaue, S., Zaneveld, J. R. V., Mitchell, B. G., Muller, J. L., Kahru, J. M., Wieland, J., et al. (2003). Inherent optical properties: Instruments, characterization, field measurement and data analysis protocols. In J. L. Muller, G. S. Fargion, & C. R. McClain (Eds.), Ocean optics protocols for satellite ocean colour validation, revision 4. Greenbelt, MD, USA: NASA, Goddard Space Flight Center.Google Scholar
- Preethi Latha, T., Nagamani, P. V., Rao, B. S., Amarendra, P., Rao, K. H., Choudhury, S. B., et al. (2013). Particle backscattering variability in the coastal waters of Bay of Bengal: a case study along off Kakinada and Yanam regions. Geoscience and Remote Sensing Letters, 10(6), 1517–1521.CrossRefGoogle Scholar
- Preethi Latha, T., Nagamani, P. V., Rao, K. H., Dash, S. K., Choudhury, S. B., Rehman, A., et al. (2014). Retrieval and validation of chlorophyll-a concentrations in the coastal waters Off Yanam and Kakinada (Godavari) basin along East coast of India. Journal of Indian Society of Remote Sensing, 42, 129–138. https://doi.org/10.1007/s12524-013-0282-3.CrossRefGoogle Scholar
- Rao, T. D. V. P., Latha, T. P., Rao, K. H., Choudhury, S. B., & Nagamani, P. V. (2012). Processing of Oceansat-2 ocean colour monitor data using SeaDAS. NRSC/ECSA/AOSG/OSD/December-2012/TR-488.Google Scholar
- Timmermans, R. K., Vander Woerd, H. J., Wernand, M. R., Sligting, M., Uitz, J., & de Baar, H. (2008a). In situ and remote sensed chlorophyll fluorescence as indicator of the physiological state of phytoplankton near the Isles Kerguelen (Southern Ocean). Polar Biology. https://doi.org/10.1007/s00300-007-0398-4.Google Scholar
- Timmermans, K. R., Van der Woerd, H. J., Wernand, M. R., Sligting, M., Uitz, J., & De baar, H. J. W. (2008b). In situ and remote based chlorophyll fluorescence as indicator of the physiological state of phytoplankton near the Isles Kerguelen (Southern Ocean). Polar Biology, 31, 617–628.CrossRefGoogle Scholar