| 1 | This directory contains "ecrad_meridian.nc", a pole-to-pole slice of |
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| 2 | low-resolution IFS model data in a form to use as input to the offline |
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| 3 | version of ecRad. It includes aerosols extracted from the CAMS |
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| 4 | climatology used operationally in IFS Cycle 43R3. |
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| 5 | |
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| 6 | Up to ecRad version 1.1.6, the file included a modification for Earth |
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| 7 | curvature effects within the IFS such that the online radiation scheme |
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| 8 | never sees a solar zenith angle greater than 90 degrees. However, it |
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| 9 | is important to test the offline ecRad for such conditions, so from |
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| 10 | version 1.1.7, the cos_solar_zenith_angle variable has been modified |
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| 11 | to allow the sun to go below the horizon. |
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| 12 | |
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| 13 | Typing "make" in this directory runs various configurations of ECRAD - |
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| 14 | see the Makefile for details. |
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| 15 | |
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| 16 | To run with a configuration similar to older cycle 43R3, type |
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| 17 | |
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| 18 | make CONFIG=configCY43R3.nam |
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| 19 | |
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| 20 | The Matlab script plot_ifs.m and Python script plot_ifs.py can be used |
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| 21 | to visualize the results. The file |
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| 22 | "ecrad_meridian_default_out_REFERENCE.nc" contains a reference version |
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| 23 | of the output file "ecrad_meridian_default_out.nc" (case "a" above), |
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| 24 | which you can compare to be sure your compilation is working as |
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| 25 | expected. Sometimes this file lags intermediate versions of ecRad, |
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| 26 | especially git snapshots. It is always generated using gfortran in |
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| 27 | double precision. |
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| 28 | |
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| 29 | Note that the shortwave diagnosed cloud cover will be set to -1 when |
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| 30 | the sun is below the horizon. |
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