Nearshore mixing and nutrient delivery along the western Antarctic Peninsula

• Published in: Antarctic Science
• Main Authors: Corbett, D. Reide, Crenshaw, Jared, Null, Kimberly, Peterson, Richard N., Peterson, Leigha E., Lyons, W. Berry
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 2017
• Subjects: Geology; Ecology, Evolution, Behavior and Systematics; Oceanography; Antarctic; Southern Ocean; Antarctic Peninsula; Anvers; Anvers Island; Antarc*; Antarctic Science
• Online Access: http://dx.doi.org/10.1017/s095410201700013x; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201700013X

Abstract The surface waters of the Southern Ocean play a key role in the global climate and carbon cycles by promoting growth of some of the world’s largest phytoplankton blooms. Several studies have emphasized the importance of glacial and sediment inputs of Fe that fuel the primary production of the Fe-limited Southern Ocean. Although the fertile surface waters along the shelf of the western Antarctic Peninsula (WAP) are influenced by large inputs of freshwater, this freshwater may take multiple pathways (e.g. calving, streams, groundwater discharge) with different degrees of water-rock interactions leading to variable Fe flux to coastal waters. During the summers of 2012–13 and 2013–14, seawater samples were collected along the WAP, near Anvers Island, to observe water column dynamics in nearshore and offshore waters. Tracers ( 223,224 Ra, 222 Rn, 18 O, 2 H) were used to evaluate the source and transport of water and nutrients in coastal fjords and across the shelf. Coastal waters are compared across two field seasons, with increased freshwater observed during 2014. Horizontal mixing rates of water masses along the WAP ranged from 110–3600 m 2 s -1 . These mixing rates suggest a rapid transport mechanism for moving meltwater offshore.