Sea ice algae, a major food source for herbivorous plankton and benthos in the eastern Bering Sea.


funded by NSF through award 0732767

Picture gallery

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Working on the Bering Sea ice (spring 2009, image: T. van Pelt)


ice corer

Sea ice corer used for collecting ice samples (spring 2009, image: T. van Pelt)

ice auger

Ice auger is used to get larger holes for e.g. CTD, sediment traps (spring 2009, image: T. van Pelt)

sediment trap

Deployment of sediment trap (spring 2009, image: T. van Pelt)


This CTD measures water temperature, salinity and the light intensity under the ice (spring 2009, image: T. van Pelt)

water sampler



A small water sampler (Kemmerer bottle) is used to collect under-ice water samples (spring 2009, image: T. van Pelt)


Student Jared Weems and technician Heloise Chenelot take a sediment sample from a van Veen grab for stable isotope analysis. (picture: Iken)

Benthic macrofauna sample sieved from a van Veen grab catch. (picture: Iken)

Student Jared Weems works on incubation experiments with Baring Sea invertebrates that are being fed with isotope-enriched food.



Grease ice (a form of new ice) is forming bands in a lead between young sea ice. Note the sea smoke.

(video: Gradinger)


This movie was taken in the Bering Sea in spring 2010 onboard the USCGC Polarsea. It shows the ship passing a refrozen lead, covered by dark nilas (new ice). Video: Gradinger


Nilas ice is a newly formed sea ice that forms a thin elastic crust. The video was taken in the Bering Sea in spring 2010 during a NSF/NPRB funded research expedition onboard the USCG icebreaker Polarsea (for scale: ship length of 122 m). You can see both light (thicker) and dark (thinner) nilas. Information on ice classifications can be found for example in the Manual for Ice. Video: Gradinger

This bowhead whale was seen resting in a lead in the pack ice zone of the Bering Sea on March 13, 2010. Video: Gradinger




The USCGC Polarsea approaches the open sea on April 4, 2010 after working in the sea ice covered Bering Sea for about a month. A light ocean swell moves ship and ice. Vidoe: Gradinger



This video provides impressions from an NSF/NPRB funded expedition onboard the USCGC Healy in March 2009. This cruise started in Kodiak and ended in Dutch Harbor. Most video sequences show the ice covered waters of the Bering Sea south of St. Lawrence Island. Video: Gradinger

page modified February 19, 2013 .