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constants.py
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constants.py
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"""Constants.py
Class that contains most used atmospheric constant values
Created: 08 August 2013
Modified: Mon Aug 4 16:01:41 EST 2014: Added cv, kappa, L, constants for moist adiabatic lapse rate
Aug 11 2014 => Added secinday. Roman Olson, CCRC, UNSW.
Modified: Sat Mar 7 23:17:43 AEDT 2015: Added earth radius. Daniel Argueso, CCRC, UNSW.
"""
class const:
Rd = 287.04 #gas constant air (dry)
Rv = 461.5 #gas constant vapor
cp = 7.*Rd/2.
cv = 718.
epsilon_gamma = 0.62197
es_base_bolton = 611.2 #Pa
es_Abolton = 17.67 #
es_Bbolton = 243.5 # degC
es_base_tetens = 6.1078
es_Atetens_vapor = 7.5
es_Btetens_vapor = 237.3
es_Atetens_ice = 9.5
es_Btetens_ice = 265.5
g = 9.81
p1000mb = 100000.
rcp = Rd/cp
tkelvin = 273.15
missingval = 1.e+20
kappa = (cp-cv)/cp
L= 2.501e6 # latent heat of vaporization
#Constants used to calcualte moist adiabatic lapse rate
#Formula 3.16 in Rogers&Yau (from Geir Arne Waagboe ;http://code.google.com/p/pywrfplot/)
a = 2./7.
b=epsilon_gamma*L*L/(Rd*cp)
c = a*L/Rd
secinday = 86400 # Number of seconds in a day
earth_radius=6371000 #Earth radius in m