Comparison of MODIS and VIIRS in detecting a harmful algal bloom in the NE Gulf of Mexico Chuanmin Hu 1, Brian B. Barnes 1, Lin Qi 1, Alina A. Corcoran.

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Comparison of MODIS and VIIRS in detecting a harmful algal bloom in the NE Gulf of Mexico Chuanmin Hu 1, Brian B. Barnes 1, Lin Qi 1, Alina A. Corcoran 2 1 University of South Florida 2 Florida Fish and Wildlife Conservation Commission NASA MODIS/VIIRS team meeting, May 18 – 22, 2015

MODIS and VIIRS ocean bands SensorRes. (km)SwathRevisitOcean Bands * Duration MODISA1.1 x km1-2 day9, nm2002 – now VIIRS0.75 x km1 day7, nm2011 – now MODISA has two more bands than VIIRS at 531 and 678 nm

Cross-sensor comparison for Tampa Bay NASA OBPG reprocessing

Cross-sensor comparison for Tampa Bay NASA OBPG reprocessing

Cross-sensor comparison for Tampa Bay NASA OBPG reprocessing

Question: How does VIIRS perform in detecting HABs? One case study in CDOM-rich dark waters

A Karenia brevis bloom in NEGOM

ERGB image series showing dark waters

Similarity and contrast between MODIS and VIIRS

Validation using field measurements MODISA nFLH 7/23/2014

Validation using field measurements

Validation using water sample analysis

nFLH: July 23 K. brevis: July nFLH: July 30 K. brevis: July 24 – Aug 1 Chla: July 23 K. brevis: July Chla: July 30 K. brevis: July 24 – Aug 1 Validation using water sample analysis

nFLH: Aug 8 K. brevis: July 31 – Aug 8 Chla: Aug 8 K. brevis: July 31 – Aug 8 nFLH: Aug 18 K. brevis: Aug Chla: Aug 18 K. brevis: Aug Validation using water sample analysis

Conclusions VIIRS and MODISA show consistent Rrs retrievals in Tampa Bay and NEGOM However, VIIRS shows some deficiency in detecting Karenia brevis HABs in dark waters due to its lack of a fluorescence band New approaches need to be developed to overcome such a deficiency for HAB detection

To be continued… MODIS nFLH VIIRS Chl_OC3 VIIRS HAB index All images taken on 8/27/2014

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