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Heat stress
heat_wbgt_simplified
Simplified WBGT index.
Available in version 6.4.0 and later.
Prototype
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/heat_stress.ncl" ; This library is automatically loaded ; from NCL V6.5.0 onward. ; No need for user to explicitly load. function heat_wbgt_simplified ( t : numeric, vp : numeric, iounit [2] : integer, opt [1] : logical ) return_val [dimsizes(t)] : float or double
Arguments
tScalar or array containing temperature(s) [ units see iounit(0) ].
vpScalar or array containing vapor pressure (Pa).
iounitAn integer array of length 2 which specifies the units of the input t and vp:
- iounit(0)=0 input t (degC)
- iounit(0)=1 input t (degK)
- iounit(0)=2 input t (Farenheit)
- iounit(1)=0 input vp (hPa)
- iounit(1)=1 input vp (Pa)
- iounit(1)=2 input vp (kPa)
Currently not used. Set to False.
Return value
A scalar or an array of the same size and shape as t. The output will be double if t or rh is of type double. This is a unitless quantity.
Description
REFERENCES: Willett, K.M., and S. Sherwood, 2010: Exceedance of heat index thresholds for 15 regions under a warming climate using the wet-bulb globe temperature, Int. J. Climatol. doi:10.1002/joc.2257 Buzan, J.R. et al (2015): Implementation and comparison of a suite of heat stress metrics within the Community Land Model version 4.5 Geosci. Model Dev., 8, 151–170, 2015 www.geosci-model-dev.net/8/151/2015/ doi:10.5194/gmd-8-151-2015
See Also
Examples
Example 1:
ta = 25.0 ; C vp = 150. ; Pa iou = (/0, 1/) ; C, Pa wbgt_s = heat_wbgt_simplified(ta, vp, iou, 0) print(wbgt_s)The output is:
Variable: wbgt_s Type: float Total Size: 4 bytes 1 values Number of Dimensions: 1 Dimensions and sizes: [1] Coordinates: Number Of Attributes: 2 long_name : simplified wet-bulb index NCL : heat_wbgt_simplified (0) 18.7045