thrins: Integrated insolation for all days exceeding a threshold
Description
Integrated insolation over the part during which daily-mean insolation
exceeds a threshold, expressed in W/m2
Usage
thrins (lat=65*pi/180,orbit,threshold=400,...)
Arguments
lat
latitude
orbit
Output from a solution, such as ber78, ber90 or la04
threshold
threshold insolation ,in W/m2
...
other arguments to be passed to Insol
Value
Time-integrated insolation in kJ/m2 . The quantity is calculated by brute-force integration
with a 1-degree time-step in true solar longitude and this can be quite slow if long series
are to be calculated.
Details
Algorithm is by M. Crucifix, but the idea of thresholded insolation is due to Huybers and
Tziperman (2008), reference below.
References
P. Huybers and E. Tziperman (2008), Integrated summer insolation forcing and 40,000-year glacial cycles: The perspective from an ice-sheet/energy-balance model, Paleoceanography, 23.