MINIONS: Small, cheap, Lagrangian floats for measurement of the biological carbon pump
MINIONS: Small, cheap, Lagrangian floats for measurement of the biological carbon pump
Abstract:
We aim to expand the coverage and persistence of oceanic biological carbon pump measurements through the development of low-cost MINature IsOpycNal floatS [MINIONS] to quantify sinking particles in a Lagrangian frame. The floats do not have active buoyancy control, but instead are pre-ballasted to target an isopycnal in the thermocline in the upper mesopelagic (500 m max). Their small size and water-following behavior minimizes the turbulence experienced by marine snow particles that settle on an upward-facing sampling surface, providing a time-lapse series of images of the accumulated particles in addition to temperature, pressure and oxygen concentration. After a prescribed duration, a burn wire drops a ballast weight, the float surfaces and transmits GPS position (for recovery) or data. A single board Linux computer for data management and communication allows easy modification to accommodate future applications. We will present data from MINION pilot testing, lessons learned, and our future research directions.