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User group experiments
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Table: User group experiments. Experiment | Scientific content | Group |
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| control | OpenIFS 43r3 experiment at TCo399L137 resolution with 900 s time step using ERA5 as initial condition at 00 on 25 September 2019 (no scaling) | All groups | | rad_0_NA_ | to| top | Scaling to 0 for radiative tendency between 400 and 50 hPa over the North Atlantic | Jake, Leo | | rad_2_NA_top | Doubling the radiative tendency between 400 and 50 hPa over the North Atlantic | Jake, Leo | | rad_0_Karl | Scaling to 0 for radiative tendency between 900 and 100 hPa over Karl | Arnaud, Lorenzo, Miriam, Mokhliss | all_0_Karl | Scaling to 0 for tendencies due to radiation, convection and cloud processes between 900 and 100 hPa over Karl | Arnaud, Lorenzo, Miriam, Mokhliss | | con_0_Karl_48h | Scaling to 0 for convective tendency in a box moving with Karl in the first 48 hours | Irina, Lauri, Mika, Terhi + Joakim | | con_2_Karl_48h | Doubling the convective tendency in a box moving with Karl in the first 48 hours | Irina, Lauri, Mika, Terhi + Joakim | | con_0.5_def_24h | Scaling to 0.5 for convective tendency in the “default” box between 900 and 200 hPa in the first 24 hours | Guokun, Jian-Feng, Jun, Ying + Victoria | | con_1.5_def_24h | Scaling to 1.5 for convective tendency in the “default” box between 900 and 200 hPa in the first 24 hours | Guokun, Jian-Feng, Jun, Ying + Victoria | | con_0.5_Karl_48h | Scaling to 0.5 for convective tendency between 900 and 300 hPa in a box moving with Karl in the first 48 hours | Bethan, Federico, Marvin | | con_1.5_Karl_48h | Scaling to 1.5 for convective tendency between 900 and 300 hPa in a box moving with Karl in the first 48 hours | Bethan, Federico, Marvin | | cloud_0.5_Karl_48h | Scaling to 0.5 for tendency due to cloud microphysics between 900 and 300 hPa in a box moving with Karl in the first 48 hours | Bethan, Federico, Marvin | | cloud_0.5_Karl_48h | Scaling to 1.5 for tendency due to cloud microphysics between 900 and 300 hPa in a box moving with Karl in the first 48 hours | Bethan, Federico, Marvin |
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Experiment
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Experiments modifying the temperature tendency due to radiation
Main conclusions:
- Increasing tendency from radiation (heating at daytime, cooling at night) in the upper levels over the North Atlantic (experiment rad_2_NA_top
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all_0_Karl
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Scaling to 0 for tendencies due to radiation, convection and cloud processes between 900 and 100 hPa over Karl
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Scaling to 0 for convective tendency in a box moving with Karl in the first 48 hours
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Scaling to 0.5 for convective tendency in the “default” box between 900 and 200 hPa in the first 24 hours
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Scaling to 0.5 for convective tendency between 900 and 300 hPa in a box moving with Karl in the first 48 hours
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Scaling to 0.5 for tendency due to cloud microphysics between 900 and 300 hPa in a box moving with Karl in the first 48 hours
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- in Table) leads to higher mean sea level pressure values over the North Atlantic and it is compensated with lower MSLP almost everywhere else (Fig. 1).
- Nullified tendency from radiation over the North Atlantic from 900 to 100 hPa (experiment rad_0_Karl) slightly deepen the cyclone (or shift it eastwards). The output tendency from radiation remains below 1K/day after 48 hours (i.e. at 00 UTC; Fig. 2).
Explanation:
- ?
- The tendency due to radiation is chopped back every time step, so basically the radiation does not have too much contribution to the total tendency. However, it affects the results only slightly due to the magnitude of this sort of tendency.
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 Image Added | | Figure 1: Difference in mean sea level pressure (in hPa) between the experiment with no temperature tendency from radiation (rad_0_NA_top) and the experiment with doubled temperature tendency from radiation (rad_2_NA_top). |
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