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.)

@@ Line 1: / Line 1: @@
+The coefficients for the saturation temperature relation for the condensing gas are now input parameters.
+KRC uses the Clausius-Clapeyron relation:
-define KRC_Cond_Gas(){
-	if($ARGC == 0){
+::ln P = a - b/T
-    printf (" Uses the adequate Clausius Clapeyron Coefficients to predict the frost point \n")
-    printf (" Feeds KRC with SatPrA, SatPrB, FANON, AMW \n")
-    printf (" $1: Body \n")
-    printf (" Currently Supported: \"Mars\" or \"Pluto\" or \"Titan\" \n")
- 	}
-	Body   = $1
-	if(Body == "Mars"){
-  	SatPrB = 3182.48
-	  SatPrA = 27.9546
-	  AMW    = 43.54                                                                      #Sylvain's own calculation
-    FANON  = 0.040                                                                        #Paul R. Mahaffy, Science 2013 (SAM)
-		KPREF  = 1
-	}
-	if(Body == "Pluto"){
+where P is pressure in Pascal and T is temperature in Kelvin.
-  	SatPrB = 9.2338
-	  SatPrA = -724.9720
-	  AMW   = 27.
-	  FANON = 0.1
-		KPREF = 0
-	}
- 	if(Body == "Titan"){
+This should be useful for Mars, Titan, Pluto etc.
-  	SatPrB = 9.2338
-	  SatPrA = -724.9720
- 		AMW   = 28.8
-   	FANON = 0.016
-		KPREF = 0
-	}
-	if(Body != "Mars" && Body != "Titan" && Body != "Pluto") {
+:SatPrA correspond to the Clausius-Clapeyron coefficient 'a'.
-	  printf("Only Mars, Pluto, and Titan currently support Condensable Gas defaults\n")
-		return(-999.)
+:SatPrB corresponds to the Clausius-Clapeyron coeffcient 'b'.
-	} else {
-		out        = {}
+:LVFT = "T"
-		out.SatPrA = SatPrA
-		out.SatPrB = SatPrB
+Values for CO2 are a = 27.9546 and b = 3182.48 (Provided by HHK, most likely from the Mars book).
-		out.AMW    = AMW
+Values for N2 are a = 9.2338 and b = -724.9720 (Derived by SP using this table: [[File:Clausius_Clapeyron.xlsx]]
-		out.FANON  = FANON
-		out.KPREF  = KPREF
+The proper molecular weight should be input AMW. The Mass-fraction of mean atmosphere that is non-condensing should also be specified with FANON.
-		return(out)
-	}
+===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
+[[Image:TFROST_1.png|800px]]
+ 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===
+  SatPrB = 9.2338
+  SatPrA = -724.9720
+  AMW    = 27.
+  FANON  = 0.1
+  KPREF  = 0
+===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.
+[[Image:TFROST_2.png|800px]]
+ out_1 = krc(lat = 75.)
+ out_2 = krc(lat = 75, JBARE = 50.)

Condensable Atmosphere

Latest revision as of 15:37, 14 April 2020

[edit] Mars

[edit] Pluto

[edit] Titan

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