Manganini Kevin

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Manganini
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Kevin
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Tracking Sargassum in the Caribbean: the deployment and validation of a low-cost surface drifter

2023-04-26 , Pixa, Chase , Manganini, Kevin , Michel, Anna P. M.

Sargassum blooms have been causing significant ecological and economic damage to coastal regions in the Northern Equatorial Atlantic since 2011. To better understand the movement and effects of this macroalgae, there is a need to track its transport. In this study, a low-cost drifter was deployed, designed to entangle with Sargassum and aid in its tracking. The design was based on the results of twenty-seven drifter designs and five days of field trials. The tracking data was validated using gridded wind and current products, as well as high resolution satellite imagery. The successful entanglement and tracking with the Sargassum demonstrated in this study can provide in situ movement data to ground-truth models and supplement gaps in satellite imaging. The results can guide future studies and further our understanding of its movement in the great Atlantic Sargassum belt (GASB).

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River Inflow Dominates Methane Emissions in an Arctic Coastal System

2020-04-23 , Manning, Cara C. , Preston, Victoria Lynn , Jones, Samantha F. , Michel, Anna P. M. , Nicholson, David P. , Duke, Patrick J. , Ahmed, Mohamed M. M. , Manganini, Kevin , Else, Brent G. T. , Tortell, Philippe D.

We present a year‐round time series of dissolved methane (CH4), along with targeted observations during ice melt of CH4 and carbon dioxide (CO2) in a river and estuary adjacent to Cambridge Bay, Nunavut, Canada. During the freshet, CH4 concentrations in the river and ice‐covered estuary were up to 240,000% saturation and 19,000% saturation, respectively, but quickly dropped by >100‐fold following ice melt. Observations with a robotic kayak revealed that river‐derived CH4 and CO2 were transported to the estuary and rapidly ventilated to the atmosphere once ice cover retreated. We estimate that river discharge accounts for >95% of annual CH4 sea‐to‐air emissions from the estuary. These results demonstrate the importance of resolving seasonal dynamics in order to estimate greenhouse gas emissions from polar systems.