Abstract
Coral reefs are fragile and endangered ecosystems in the tropical marine and coastal environment. Thermal stress due to marine heat waves (MHW) could cause significantly negative impacts on the health conditions, i.e., bleaching of the coral ecosystem. The current study is an attempt to quantify the intensity of coral bleaching in the Andaman region in recent decades using the intensity of marine heat wave (IMHW) estimated from satellite measured sea surface temperature (SST). A linear regression model was developed between IMHW and in situ observations of percent coral bleaching (PCB) which has the slope 7.767 (of IMHW unit) and intercept (− 141.7). Further, an attempt was also made to establish the relationship between PCB and the ratio between the remote sensing reflectance (Rrs) at 443 and 531 nm to upscale the percentage of coral bleaching at synoptic scales. A significant positive correlation between the PCB and band ratio index was found (R2 = 0.72). This approach can be used for the operational monitoring of coral reef beaching in this region.
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Data availability
The data that support the findings of this study are available on request from the corresponding author.
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Acknowledgements
The authors would like to thank the NASA Jet Propulsion Laboratory for providing the AVHRR Oceans Pathfinder SST data through the Physical Oceanography Distributed Active Archive Center (PODAAC) and MODISA for providing open source Rrs data. Thanks to the Director of INCOIS for his encouragement. We also thank the Pacific Marine Environmental Laboratory for making FERRET Software available and Python on open source domain for data process, visualization and analysis. Sincere thanks to anonymous reviewers whose comments/suggestions helped improve and clarify this manuscript.
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Highlights
• This study is establishing an empirical relation between percentage of coral bleaching with Intensity Marine Heat Wave (IMHW) and spectral signature of bleached coral environs. This relation is enhancing the capability of detecting the intensity thermal induced coral bleaching on spatio-temporal scales. This approach can be adopted routine coral bleaching monitoring program required for the coastal zone management.
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Mohanty, P.C., Kushabaha, A., Mahendra, R.S. et al. Persistence of marine heat waves for coral bleaching and their spectral characteristics around Andaman coral reef. Environ Monit Assess 193, 491 (2021). https://doi.org/10.1007/s10661-021-09264-y
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DOI: https://doi.org/10.1007/s10661-021-09264-y