NaoStationIndex: station-based NAO index (Hurrell 1995).
Co2CurveFit: polynomial trend plus annual harmonics (Thoning et al.
1989). Identical to the Python arm morie.fn.climfit.
Usage
NaoStationIndex(slp_south, slp_north, months = NULL, base = NULL)
Co2CurveFit(t, co2, n_poly = 3, n_harm = 4)
Arguments
- slp_south, slp_north
Sea-level pressure series.
- months
Optional calendar month of each value.
- base
Optional logical mask of the base period.
- t
Decimal years.
- co2
Concentrations.
- n_poly
Number of polynomial terms.
- n_harm
Number of harmonics.
References
Hurrell, J. W. (1995). Decadal trends in the North Atlantic
Oscillation. Science 269, 676-679.
Thoning, K. W., Tans, P. P. and Komhyr, W. D. (1989). Atmospheric carbon
dioxide at Mauna Loa Observatory 2. Journal of Geophysical Research 94,
8549-8565.
Examples
NaoStationIndex(c(1020, 1024, 1018), c(1000, 996, 1004))
#> [1] -0.2182179 2.0910895 -1.8728716
