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Satellite-based detection and monitoring of phytoplankton blooms along the Oregon coast Public Deposited

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  • We have applied a normalized difference algorithm to 8 day composite chlorophyll-a (CHL) and fluorescence line height (FLH) imagery obtained from the Moderate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft in order to detect and monitor phytoplankton blooms in the Oregon coastal region. The resulting bloom products, termed CHL[subscript rel] and FLH[subscript rel], respectively, describe the onset and advection of algal blooms as a function of the percent relative change observed in standard 8 day CHL or FLH imagery over time. Bloom product performance was optimized to consider local time scales of biological variability (days) and cloud cover. Comparison of CHL[subscript rel] and FLH[subscript rel] retrievals to in situ mooring data collected off the central Oregon coast from summer 2009 through winter 2010 shows that the products are a robust means to detect bloom events during the summer upwelling season. Evaluation of winter performance was inconclusive due to persistent cloud cover and limited in situ chl-a records. Pairing the products with coincident in situ physical proxies provides a tool to elucidate the conditions that induce bloom onset and identify the physical mechanisms that affect bloom advection, persistence, and decay. These products offer an excellent foundation for remote bloom detection and monitoring in this region, and the methods developed herein are applicable to any region with sufficient CHL and FLH coverage.
  • KEYWORDS: Oregon coast, phenology, upwelling, satellite remote sensing, California Current, bloom timing
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  • McKibben, S. M., P. G. Strutton, D. G. Foley, T. D. Peterson, and A. E. White (2012), Satellite-based detection and monitoring of phytoplankton blooms along the Oregon coast, Journal of Geophysical Research, 117, C12002, doi:10.1029/2012JC008114.
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  • 117
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  • C12
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  • This study was supported by National Oceanic and Atmospheric Administration (NOAA) grant NA07NOS4780195 from the Monitoring and Event Response for Harmful Algal Blooms (MERHAB) program and NA08NES4400013 to the Cooperative Institute for Oceanographic Satellite Studies. This is MERHAB publication 165. Initial concept of chlorophyll anomaly product development for Oregon was supported by NOAA Oceans and Human Health grant NA04OAR4600202.
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