Ocean transport and vertical mixing connect Greenland's macroalgae to deep ocean carbon sinks

作者：Daniel F. Carlson, Nobuhiro Suzuki, Ruben Carrasco, Karen Filbee‐Dexter, Laura C. Gillard, Paul G. Myers, Ana M. Queirós, Jorge Assis, Carlos M. Duarte, Mikael K. Sejr, Dorte Krause‐Jensen · 发表于：The Science of The Total Environment · 年份：2025 · DOI：10.1016/j.scitotenv.2025.181247 · 被引用次数：2 · 研究领域：Oceanographic and Atmospheric Processes、Arctic and Antarctic ice dynamics、Methane Hydrates and Related Phenomena

Macroalgal carbon export estimates make assumptions about lateral transport away from the coast and vertical export to deep ocean sinks. Yet, few studies have resolved these pathways. This paper tests lateral surface transport and vertical export assumptions using the Southwest Greenland continental shelf and the Labrador Sea as a testbed. Macroalgae grow on Greenland's rocky shoreline and previous studies have documented oceanographic connectivity between coastal and offshore regions. This study analyzed 1380 Sentinel-2 satellite images to find 7973 patches of floating macroalgae on the SW Greenland shelf and in the Labrador Sea, providing evidence of their presence on the shelf and offshore waters. Since satellite imagery provides a snapshot of macroalgal positions at a given time, 305 surface drifter trajectories and a Lagrangian particle tracking model (LPTM) are used to quantify residence times and transport pathways. The average drifter-derived surface residence times on the SW Greenland shelf and the Labrador Sea are 12.1 days and 63.6 days, respectively. Applying results from studies of macroalgal longevity, the drifter-derived residence times suggest that macroalgae can remain intact during their transit of the shelf, allowing them to sink in deeper water offshore. The LPTM traced the origins and pathways of selected patches in June 2018. To explore vertical export mechanisms, a Large Eddy Simulation revealed that deep convection can transport buoyant macroalgae to d...