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| ===== Radiative Convective Equilibrium ===== | ===== Radiative Convective Equilibrium ===== |
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| //2025 Revision in progress// | Here is the code: {{ :radcon_2025.tar.gz }} {{ :crm_2025.tar.gz |}} |
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| This page describes a series of simulations | This page describes a series of simulations |
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| * **stn**, standard lapse rate of 6.5 K km^-1^ is used for the convective adjustment | * **stn**, standard lapse rate of 6.5 K km<sup>-1</sup> is used for the convective adjustment |
| * **mst**, moist adiabatic lapse rate is used for the convective adjustment | * **mst**, moist adiabatic lapse rate is used for the convective adjustment |
| * **rad**, no convective adjustment, and no sensible heat flux from the surface | * **rad**, no convective adjustment, and no sensible heat flux from the surface |
| * model label: **stn** | * model label: **stn** |
| * Convective adjustment with the standard lapse rate. | * Convective adjustment with the standard lapse rate. |
| * **Note:** the final input file to the CRM, and thus one consistent with radiative convective equilibrium, is offered at [[http://12characters.net/xcrm/crm.cgi | CRM Online]] as '''radconeq.in'''. For your information, that file is also [[RadiativeConvectiveEquilibriumInput | here]], but with the temperature replaced by a ''*'', because those numbers are continually updated by the model. | * **Note:** the final input file to the CRM, and thus one consistent with radiative convective equilibrium, is offered at [[http://12characters.net/xcrm/crm.cgi | CRM Online]] as ''radconeq.in''. |
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| ---- | ---- |
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| ==== Turn off convection ==== | ==== Turn off convection ==== |
| | <WRAP center 50%> |
| | ^ {{ :stn_radw.png }} ^ |
| | |**radw** has specific humidity retained from **stn**. The convective adjustment and the sensible heat flux from the surface is turned off.| |
| | </WRAP> |
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| ---- | ---- |
| ||{{attachment:stn_radw.png}}||'''radw''' has specific humidity retained from '''stn'''. The convective adjustment and the sensible heat flux from the surface is turned off.|| | |
| ---- | ^ {{ :stn_radw_mx.png }} ^ |
| ||{{attachment:stn_radw_mx.png}}|| Specific humidity is invariant. If plotted with respect to pressure levels, these curves would overlap. But, being plotted with respect to z levels, they don't.|| | | Specific humidity is invariant. If plotted with respect to pressure levels, these curves would overlap. But, being plotted with respect to z levels, they don't.| |
| ---- | ---- |
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| == Moist adiabatic adjustment == | ==== Moist adiabatic adjustment ==== |
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| | ^ {{ :mst_mst2xw_mst2x.png }} ^ |
| | |As in the *stn* simulations, but using the moist adiabatic lapse rate. The moist adiabatic lapse rate decreases as temperature increases. This property leads to a negative feedback in global warming forced by radiation. The specific comparison demonstrating the negative feedback is to compare the $\Delta T$ in **mst2x** with **stn2x**.| |
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| ---- | ---- |
| ||{{attachment:mst_mst2xw_mst2x.png}}||As in the '''stn''' simulations, but using the moist adiabatic lapse rate. The moist adiabatic lapse rate decreases as temperature increases. This property leads to a negative feedback in global warming forced by radiation. The specific comparison demonstrating the negative feedback is to compare the ΔT in '''mst2x''' with '''stn2x'''.|| | |
| ---- | <WRAP center 50%> |
| ||{{attachment:mst_mst2xw_mst2x_mx.png}}||The mixing ratio. Notice the red overlies the blue.|| | ^ {{ :mst_mst2xw_mst2x_mx.png }} ^ |
| | | The mixing ratio. Notice the red overlies the blue.| |
| | </WRAP> |
| ---- | ---- |
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| ==== Increase solar radiation ==== | ==== Increase solar radiation ==== |
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| | ^ {{ :stn_stnsolw_stnsol.png }} ^ |
| | |Warming forced by changing the solar constant in the model from 700 W m<sup>-2</sup> to 710 W m<sup>-2</sup>. The model has fixed zenith angle, with cosine=0.5. So the change in incoming solar radiation is 5 W m<sup>-2</sup>. Being cloudless, the model has an albedo of approximately 0.16. So the radiative forcing at the top of the atmosphere is 4.2 W m<sup>-2</sup>, comparable to double CO2.| |
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| ---- | ---- |
| ||{{attachment:stn_stnsolw_stnsol.png}}||Warming forced by changing the solar constant in the model from 700 W m^-2^ to 710 W m^-2^. The model has fixed zenith angle, with cosine=0.5. So the change in incoming solar radiation is 5 W m^-2^. Being cloudless, the model has an albedo of approximately 0.16. So the radiative forcing at the top of the atmosphere is 4.2 W m^-2^, comparable to double CO,,,2,,.|| | |
| ---- | <WRAP center 50%> |
| ||{{attachment:stn_stnsolw_stnsol_mx.png}}||The mixing ratio.|| | ^ {{ :stn_stnsolw_stnsol_mx.png }} ^ |
| | |The mixing ratio.| |
| | </WRAP> |
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