Overview

Summary & Introduction

Field measurements

Ice microstructure

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Field measurements

As part of the project, thermistor arrays have been frozen into the ice cover at two locations (Chukchi Sea fast ice, Elson Lagoon ice) to record temperature variability and derive heat fluxes through the ice in relation to the brine drainage features. The images below show unprocessed temperature records from one of the sites, along with pictures of the ice bottom, drainage features and microalgal inclusions in the ice.

 

Picture of bottom of ice core (left is bottom, the top is towards the right) extracted in April 2000 from the Chukchi Sea fast ice (approximately 1.4 m thick). Note in particular the brownish layer at the very bottom at left, which is indicative of higher concentrations of microalgae present in the ice.

Close-up photograph of the bottom of the ice core (10 cm diameter) shown above. Note in particular the numerous "holes" visible in the core, corresponding to the termination points of individual brine channels. The brownish discolouration (following the orientation of the ice crystals and intracrystalline lamellae, running from left to right) is due to microalgae residing in spaces between crystals and ice lamellae (see an animation of the pore microstructure of the lower ice layers; for more information on sea-ice organisms check our LExEn Project).

Thermal record of a brine drainage event as recorded by three sets of horizontal thermistor arrays frozen into the ice cover. The y-axis at left shows the temperature in degrees Kelvin ([deg C] = [K]-273.15), the x-axis at the bottom indicates the number of the sample (one sample every 10 minutes, the entire time series is approximately 72 hours long).

 


Last update: October 14, 2000

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