Condensable Atmosphere

Latest revision as of 15:37, 14 April 2020

The coefficients for the saturation temperature relation for the condensing gas are now input parameters. KRC uses the Clausius-Clapeyron relation:

ln P = a - b/T

where P is pressure in Pascal and T is temperature in Kelvin.

This should be useful for Mars, Titan, Pluto etc.

SatPrA correspond to the Clausius-Clapeyron coefficient 'a'.

SatPrB corresponds to the Clausius-Clapeyron coeffcient 'b'.

LVFT = "T"

Values for CO2 are a = 27.9546 and b = 3182.48 (Provided by HHK, most likely from the Mars book). Values for N2 are a = 9.2338 and b = -724.9720 (Derived by SP using this table: File:Clausius Clapeyron.xlsx

The proper molecular weight should be input AMW. The Mass-fraction of mean atmosphere that is non-condensing should also be specified with FANON.

[edit] Mars

SatPrB = 3182.48
SatPrA = 27.9546
AMW    = 43.54             #SP's own calculation
FANON  = 0.040             #Paul R. Mahaffy, Science 2013 (SAM)
KPREF  = 1

out_1 = krc(lat=72.,SatPrA=27.9546,SatPrB=3182.48,AMW=43.54,FANON=0.040,KPREF=1,LVFT="T" )
out_2 = krc(lat=72.,TFROST=151.)

[edit] Pluto

 SatPrB = 9.2338
 SatPrA = -724.9720
 AMW    = 27.
 FANON  = 0.1
 KPREF  = 0

[edit] Titan

SatPrB = 9.2338
SatPrA = -724.9720
AMW    = 28.8
FANON  = 0.016
KPREF  = 0

KRC function: KRC_Cond_Gas()

JBARE forces frost free at specified season. Default JBARE=0. (no forcing when = 0.)

JBARE corresponds to a CROCUS date, in Ls.

Note: the interface facilitates the use of JBARE so that JBARE ~ CROCUS date (Ls), but KRC has a more complex definition.

out_1 = krc(lat = 75.)
out_2 = krc(lat = 75, JBARE = 50.)