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Plot and as with

Best fit to data (blue line). Reference gradient (red lines):-8.6ms/day/mbar.
Going varies with pressure because of drag, added mass and buoyancy. Barometric compensator fitted 28 March 2010 should fix this.

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04 Jan 2012 [04:31]
Barometric compensator: Why does the compensator appear to be working for rapid changes in pressure (ie over a few hours) eg [link] [link] but not for slow changes in pressure (over a few days) eg [link] [link] A real mystery. Perhaps there is a link between pressure and temperature, or maybe updraughts?
03 Jan 2012 [17:25]
Thanks to Alexander Hunt for helping with a wind - just in time!

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Interval between data points: seconds [either 3 seconds (weather data is duplicated) or multiples of 60 seconds (all data is averaged)].

Contact:, Trinity College, Cambridge