Condensable Atmosphere

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==Condensable Atmosphere==
 
 
 
The coefficients for the saturation temperature relation for the condensing gas are now input parameters.  
 
The coefficients for the saturation temperature relation for the condensing gas are now input parameters.  
 
KRC uses the Clausius-Clapeyron relation:
 
KRC uses the Clausius-Clapeyron relation:
Line 12: Line 10:
 
This should be useful for Mars, Titan, Pluto etc.
 
This should be useful for Mars, Titan, Pluto etc.
  
 +
:SatPrA correspond to the Clausius-Clapeyron coefficient 'a'.
  
SatPrA correspond to the Clausius-Clapeyron coefficient 'a'.
+
:SatPrB corresponds to the Clausius-Clapeyron coeffcient 'b'.
  
+
:LVFT = "T"
SatPrB corresponds to the Clausius-Clapeyron coeffcient 'b'.
+
  
Values for CO2 are a = 27.9546 and b = 3182.48 .
+
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.
 
The proper molecular weight should be input AMW. The Mass-fraction of mean atmosphere that is non-condensing should also be specified with FANON.
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  SatPrA = 27.9546
 
  SatPrA = 27.9546
 
  AMW    = 43.54            #SP's own calculation
 
  AMW    = 43.54            #SP's own calculation
  FANON  = 0.040           #Paul R. Mahaffy, Science 2013 (SAM)
+
  FANON  = 0.040             #Paul R. Mahaffy, Science 2013 (SAM)
 
  KPREF  = 1
 
  KPREF  = 1
  
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[[Image:TFROST_1.png|800px]]
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 +
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.)
  
 
===Pluto===
 
===Pluto===
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   SatPrB = 9.2338
 
   SatPrB = 9.2338
 
   SatPrA = -724.9720
 
   SatPrA = -724.9720
   AMW   = 27.
+
   AMW   = 27.
   FANON = 0.1
+
   FANON = 0.1
   KPREF = 0
+
   KPREF = 0
  
  
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  SatPrB = 9.2338
 
  SatPrB = 9.2338
 
  SatPrA = -724.9720
 
  SatPrA = -724.9720
  AMW   = 28.8
+
  AMW   = 28.8
  FANON = 0.016
+
  FANON = 0.016
  KPREF = 0
+
  KPREF = 0
  
  
 
KRC function: KRC_Cond_Gas()
 
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.
 +
 +
[[Image:TFROST_2.png|800px]]
 +
 +
out_1 = krc(lat = 75.)
 +
out_2 = krc(lat = 75, JBARE = 50.)

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

TFROST 1.png

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.

TFROST 2.png

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