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8.14 Clouds
field |
unit |
horizontal |
vertical |
temporal |
read time |
liquid water content |
kg water / kg air |
cell |
full levels |
[21,03], [03,09], .. |
21, 03, .. |
ice water content |
kg ice / kg air |
cell |
full levels |
[21,03], [03,09], .. |
21, 03, .. |
cloud cover |
0-1 |
cell |
full levels |
[21,03], [03,09], .. |
21, 03, .. |
cloud cover overhead |
0-1 |
cell |
half levels |
[21,03], [03,09], .. |
21, 03, .. |
cloud cover underfeet |
0-1 |
cell |
half levels |
[21,03], [03,09], .. |
21, 03, .. |
See section on Clouds
in the TMPP manual for how computed from raw data.
Details:
- Cloud fields are constant in intervals [21,03], [03,09], [09,15], and [15,21] .
- Grid cells are optionally combined by mass-average (lwc/iwc/cc)
or area-average (cco).
- Layers are combined by mass-average (lwc/iwc/cc), or bottom (cco).
- Truncation: lwc/iwc is forced to be non-negative, cc is truncated within [0,1] .
To be carefull:
- A cco/ccu computed from cc after combining levels
is different from the cco/ccu stored in the meteo files.
Tthe later are based on all levels and the assumption of
maximum random overlap.
- For photolysis, one should think about what to do with
optical thin clouds with large coverage.
- Instances have been found where there is in a grid box
substantial cloud cover (> 40%) but no associated liquid water content.
If a process depends on wether there is water or not,
please do not use a test on cloud cover but on:
|
(8.1) |
Next: 8.15 Convective fluxes
Up: 8. Meteo input
Previous: 8.13 Geo potential height
Created at IMAU on Tue Mar 3 05:00:05 CET 2009 by a slave chained in the basement