University of Cambridge > Talks.cam > British Antarctic Survey - Polar Oceans seminar series > Seasonal changes in Circumpolar Deep Water in the Amundsen Sea, Antarctica, using seal-borne tags

Seasonal changes in Circumpolar Deep Water in the Amundsen Sea, Antarctica, using seal-borne tags

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In the Amundsen Sea, Antarctica, warm salty Circumpolar Deep Water (CDW) is increasingly crossing the continental shelf toward the Pine Island Glacier (PIG) via three bathymetric troughs, accelerating the melting of the ice sheet there. Due to the difficulty of collecting data in the harsh conditions in the Amundsen Sea, little is known about the spatial and temporal variability of CDW , particularly on the seasonal scale. Using a ground-breaking new dataset of 10838 seal-tag profiles, collected throughout the undersampled winter season, we find a thicker layer of CDW in winter (June to October) than in summer (February to May) in the eastern trough, the reverse seasonality of that seen in the western trough. CDW is warmer in summer than winter, for a given density. The warmest water was observed in the eastern trough, at 1.64°C. In Pine Island Bay, the warmest water is at 1.10°C.

This talk is part of the British Antarctic Survey - Polar Oceans seminar series series.

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