Condensable Atmosphere
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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: | ||
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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'. | ||
| − | + | :SatPrB corresponds to the Clausius-Clapeyron coeffcient 'b'. | |
| − | + | :LVFT = "T" | |
| − | + | ||
| − | 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 | + | FANON = 0.040 #Paul R. Mahaffy, Science 2013 (SAM) |
KPREF = 1 | KPREF = 1 | ||
| + | [[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 | + | 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 | + | AMW = 28.8 |
| − | FANON = 0.016 | + | FANON = 0.016 |
| − | KPREF = 0 | + | KPREF = 0 |
KRC function: KRC_Cond_Gas() | KRC function: KRC_Cond_Gas() | ||
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| + | |||
| + | |||
| + | 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
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.)
