month_to_season12

Computes three-month seasonal means (DJF, JFM, FMA, MAM, AMJ, MJJ, JJA, JAS, ASO, SON, OND, NDJ).

Prototype

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"  ; This library is automatically loaded
                                                             ; from NCL V6.2.0 onward.
                                                             ; No need for user to explicitly load.

	function month_to_season12 (
		xMon  : numeric   
	)

	return_val  :  typeof(x)

Arguments

A one-, three-, or four-dimensional array [xMon(time) or xMon(time,lat,lon) or xMon(time,lev,lat,lon)] of any numeric type.

xMon must have named dimensions and the time (leftmost) dimension must be divisible by 12. The data are assumed to be monthly mean data and the first record is assumed to be January.

Return value

The return value will be of the same type and dimensionality as xMon. If the input data contains metadata (e.g., coordinate variables and attributes), these will be retained.

In addition, the attribute "season" is returned.

Description

Computes three-month seasonal means (DJF, JFM, FMA, MAM, AMJ, MJJ, JJA, JAS, ASO, SON, OND, NDJ). The first seasonal average (DJF=JF) and the last seasonal average (NDJ=ND) are actually two-month averages.

See Also

month_to_season, month_to_seasonN

Examples

; for xMon(time,lat,lon)

  xSea = month_to_season12 (xMon)

; result: xSea(dimsizes(time),lat,lon)