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Continuous winter oceanic profiling in the Cape Darnley Polynya, East Antarctica
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Continuous winter oceanic profiling in the Cape Darnley Polynya, East Antarctica
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Journal Article
Continuous winter oceanic profiling in the Cape Darnley Polynya, East Antarctica
2020
Overview
Antarctic coastal polynyas provide extremely dense water to the global abyss, but the dense water formation process has been poorly monitored in winter. This study developed a new tethered profiler to realize time-series observations of the water column in the Cape Darnley Polynya, East Antarctica. The system successfully obtained temperature and salinity profiles at 10-day intervals from March to November 2017. From March to April, significant cooling and vertical mixing started, while stratification collapsed. Salinity increased rapidly from April to late-May and then gradually increased until October. Salinity development was largely consistent with the cumulative salt increase due to sea-ice production at the initial stage, but not at latter stages, indicating the influence of cross-shelf exchange. These results highlighted the potential of the measurement platform to fill the remaining gap in the global ocean monitoring network.
