Water level recorder

 

A Paroscientific pressure sensor was installed on a rigid 3-m-long wooden 2x4. The instrument was lowered through a hole in the ice and placed about 2 m below the ice bottom at Quebec 2 and frozen into place. The instrument was used to measure the hydrostatic equilibrium of the floe. These readings are valuable since changes in hydrostatic equilibrium represent integrated changes in the mass of the entire floe. For example, snow accumulation would cause a decrease in freeboard and snow melt an increase. 

An additional water level recorder was placed at the Doghouse site. Measurements were made using a Global Water Level Logger, Model WL14. The sensor was installed on June 15 and water level data were recorded every hour through September 8. The sensor was mounted in a hydrohole approximately 90 cm below the surface of the water.The hole was checked on a regular basis throughout the summer to ensure it was ice-free so that the proper freeboard level was being measured. The absolute accuracy of the readings was approximately 10 mm, but the relative accuracy was better than 0.3 mm. Results from the Doghouse site were consistent with those measured at the Quebec site, except that the Quebec readings showed enhanced surface melting in the last 5 days prior to floebreakup. The data plotted are raw and need to be adjusted for changes in the density of the ocean water.  

 

 

 
                                          

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