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General Session 1: Physical oceanic processes: Dynamics and physical-biological-biogeochemical interactions |
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A Phaeocystis bloom captured by an UAV
Monday 9th @ 1115-1130
Conference Hall
Shaoling Shang* , Xiamen University
Presenter Email: slshang@xmu.edu.cn
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| In nearshore waters, red tide often occurs. Yet it is not easy, if not impossible, for satellites to capture these blooms due to low resolution, clouds, and difficulties with atmospheric correction. The extent of the blooms is in fact hard to be deduced either from satellites or from ship sampling. An unmanned aerial vehicle (UAV) loaded with a spectrometer recently successfully captured a Phaeocystis bloom event (up to 100-200 gel matrix/L) in a bay off southeastern China (118.4”ćE/24.5”ćN-118.6”ćE/24.6”ćN) at high spectral and spatial resolution. A novel approach was adopted for the atmospheric correction of remote sensing reflectance (Rrs) obtained from the UAV. Estimated surface chlorophyll concentration based on Rrs from the UAV was found within 25% from corresponding in situ measurements. Highest Chl was detected in the northeastern area of the bay (> 30 mg/m3). This effort highlights the advantage of UAV for harmful algae bloom in nearshore waters, which is an issue of high concern. |
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