Addition of Ligtenberg (2011) Dry Firn Densification Method #62
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Added Ligtenberg densification
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Addition of an alternative method to calculate the dry firn densification of sub-surface layers.
Arthern, 2010 (https://doi.org/10.1029/2009JF001306)
Ligtenberg, 2011 (https://doi.org/10.5167/uzh-136702)
The method requires the average annual temperature of each sub-surface layer (T_AVG) - something a bit troublesome to calculate. My current solution is to estimate it by assuming a thermal profile with the form of a trumpet curve (see image) and interpolating between the base and the depth of zero-annual amplitude (ZAA). But it could certainly be improved!
Note: the other methods could be vectorised, removing the existing Python loops to possibly improve computational efficiency.
(Code modifications contained within 'Ligtenberg Densification' branch)