In-situ observations of marine aggregates using imaging devices

Date: 
Thursday 21 October 2021 - 14:00 to 15:00
Location: 
NOC Southampton - Node Room (074/02) (Waterfront Campus).
Speaker: 
Dr Marika Takeuchi (NOCS)

Marine aggregates are formed through the coagulation of small biogenic and non-biogenic components. Visible aggregates, known as marine snow, are typically in the 0.5 to few mm size range. Aggregates are well recognized as hotspots of microbial and planktonic activities. In addition, aggregates formation is an important pathway for transferring organic matter from surface to the deep ocean, hence the impacts of aggregates in carbon flux is significant. Since carbon mass content and chlorophyll-a concentration is size dependent, aggregate size distribution is fundamental to better understand the contribution of aggregate in the ecosystems and future environmental changes. Numerous studies have been conducted at laboratories and theoretical ways to demonstrate size distribution of aggregate through aggregation and destruction of cultured aggregate or idealized particles, however, the size distribution of naturally occurring aggregate has not fully investigated in observational studies. In this talk, I will present the relationships between size distribution of aggregate and i) turbulence and ii) chlorophyll-a using a microstructure profiler and an imaging device. Furthermore, I will explore the seasonal variation of aggregate from long term monitoring.

 

Seminar category: 
POETS Corner
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