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GEUS-Glaciology-and-Climate / GC-Net-level-1-data-processing

This repository contains scripts used to flag, adjust and interpolate GC-Net data
GNU General Public License v3.0
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Sensor swap #111

Closed BaptisteVandecrux closed 1 year ago

BaptisteVandecrux commented 1 year ago

RH

TA1 vs TA2

All other station show TA1 colder than TA2 during winter inversion

TA3 vs TA4

Maybe some issue at CP1 image

BaptisteVandecrux commented 1 year ago

RH1 RH2 swaps have been fixed in 9bf2d97: image image image image image image

And TA swap at Saddle was fixed in 41f4d93: image

and at CP1 in commit 64cde6d: image

BaptisteVandecrux commented 1 year ago

The latest commits should have solved most of the sensor swaps. So I am closing this issue.

To spot the swapped instruments I assumed winter atmospheric inversion at all sites and therefore: RH1 higher than RH2 (cold air has a higher relative humidity) and TA1/3 lower than TA2/4 during that time.

For some sites, important shifts appear in the RH1 - RH2 curves. This could be a change in the spacing, new instruments or a drift from the existing sensor. I cannot know at this point even though it is crucial for methods using both levels.

I am hoping that in the future, we could cross-calibrate the RH sensors on the two levels by identifying periods where the two levels should have the same RH value (e.g. cloudy windy days?). By adjusting one sensor to the other, we would make sure that the difference between levels are due to humidity gradients and not to instrument miscalibration.