netsw_fao56

Compute net shortwave radiation as described in FAO 56.

Available in version 6.4.0 and later.

Prototype

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/crop.ncl"  ; This library is automatically loaded
                                                      ; from NCL V6.5.0 onward.
                                                      ; No need for user to explicitly load.

	function netsw_fao56 (
		radsol  : numeric, albedo:numeric   
	)

Arguments

A scalar or an array of any dimensionality containing solar radiation (see radsol_fao56).

Return value

An array of the same size, shape and units as radsol.

Description

Compute net solar radiation as described in the Food and Agriculture Organization (FAO) Irrigation and Drainage Paper 56 entitled: Crop evapotranspiration - Guidelines for computing crop water requirement . Specifically, see equation 38 of Chapter 3.

See Also

Crop & Evapotranspiration functions

Examples

Example 1: Replicate example 12 in Chapter 3.

  radsol = 14.4561    ; MJ/(m2-day)  ; see radsol_fao56 
  albedo = 0.23       ; default value
  netsw = netsw_fao56(radsol, albedo)   ;  11.13 MJ/(m2-day)
  print(netsw)

     Variable: netsw
     Type: float
     Total Size: 4 bytes
                 1 values
     Number of Dimensions: 1
     Dimensions and sizes:	[1]
     Coordinates: 
     Number Of Attributes: 4
       long_name :	net solar (shortwave) radiation
       units :	MJ/(m2-day)
       url :	http://www.fao.org/docrep/X0490E/x0490e07.htm
       info :	FAQ 56: EQN 38
     (0)	11.1312