COSMO General Meeting, Rome, Italy, 5-9 September 2011 Status of the implementation of the tile...
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Transcript of COSMO General Meeting, Rome, Italy, 5-9 September 2011 Status of the implementation of the tile...
![Page 1: COSMO General Meeting, Rome, Italy, 5-9 September 2011 Status of the implementation of the tile approach into the COSMO model COLOBOC meeting 5 September.](https://reader036.fdocuments.in/reader036/viewer/2022070306/551787f65503463e368b53af/html5/thumbnails/1.jpg)
COSMO General Meeting, Rome, Italy, 5-9 September 2011
Status of the implementation of the tile approach
into the COSMO model
COLOBOC meeting5 September 2011
Ekaterina Machulskaya
German Weather Service, Offenbach am Main, Germany
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COSMO General Meeting, Rome, Italy, 5-9 September 2011
Tile and mosaic approaches (recall)
Tiled surface scheme within full-fledged COSMO model: implementation, set up of experiments
Some results
Conclusions and outlook
Outline
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Tile and mosaic approaches
from (Ament, …)
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Tiled Surface Scheme within the 3d COSMO model
Mosaic approach implemented by Felix Ament into the COSMO version 4.7 →
either mosaic or tile approach in the version 4.16, with a user-specified number of tiles or sub-grid mosaic pixels
surface type 1
surface type 2
surface type 3
surface type 4
snow-free
snow-free
snow snow
ns_snow
ns_stat
User-defined parameters:
ns_stat: number of static surface types
ns_snow:number of those static surface typeswhich can have snow as a separate tile
→ derived parameter nsubs(total number of tiles/pixels):nsubs = (ns_stat - ns_snow) · 1 + ns_snow · 2
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Tiled Surface Scheme within the 3d COSMO model
Examples of set up:
Mosaic: without snow tiles with snow tiles
Without sub-grid refinement: ns_stat = 0, ns_snow = 0
ns_stat = N, ns_snow = 0
ns_stat = N, ns_snow = N
Tiles: only two tiles “snow/no snow” general case
ns_stat = 1, ns_snow = 1
ns_stat = N, ns_snow = M ≤ N
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Tiled Surface Scheme within the 3d COSMO model
Details of the realization of the tiles structure should be encapsulated!
TYPE tile {
LOGICAL :: snow_tile ! is it a snow tile?LOGICAL :: snowfree_tile ! is it a snow-free tile (a counterpart to a snow tile)?INTEGER :: conjunct ! = index of the counterpart (if it is a snow or snow-
free tile)}
TYPE (tile), ALLOCATABLE :: ctile(:) ! vector of nsubs tiles
Example of the code:
IF(ctile(n)% snow_tile) THEN …
ELSEIF(ctile(n)% snowfree_tile) THEN …
ELSE …
END IF
Extension of the attribute listis possible and easy
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Tiled Surface Scheme within the 3d COSMO model
• Number of tiles should not be large (computational efficiency!) Surface types with the largest difference of thermal inertia should be chosen,
now: lake/land
• Grid-scale lakes (lake fraction > 0.5) are already treated within the COSMO with FLake model;
there are, however, numerous subgrid-scale water bodies (lake fraction < 0.5) which are ignored:
lake fraction
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Tiled Surface Scheme within the 3d COSMO model: set up
Parallel experiment 8330 is set up (COSMO-EU domain, V4_16, running since 01.04.2011)
(The information about lake fraction is available within the COSMO model – no additional software to generate external parameters is needed, thanks to Uli Schaettler for this idea!)
For sub-grid lakes (lake fraction < 0.5)
• lake depth is set to 10 m• on the zero time step, the cold start is performed: lake surface temperature = MAX( land surface temperature, freezing
point ) lake bottom temperature = +4°C (temperature of maximal water density) mixing depth = 8 m ice depth = 0 m shape factor C_T = 0.5 (default)
with 2 tiles: lake/land (ns_stat = 2, ns_snow = 0)
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Tiled Surface Scheme within the 3d COSMO model: results
Difference in surface temperature between lake tile and land tile
night, 30.04.2011 00 UTC
day, 30.04.2011 12 UTC
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Tiled Surface Scheme within the 3d COSMO model: results
Difference in surface temperature between experiment with tile approach (mean over two tiles) and control experiment
night, 30.04.2011 00 UTC
day, 30.04.2011 12 UTC
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Tiled Surface Scheme within the 3d COSMO model: results
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Tiled Surface Scheme within the 3d COSMO model: results
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COSMO General Meeting, Rome, Italy, 5-9 September 2011.
…
Experiment is set up, results are monitored
Conclusions
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COSMO General Meeting, Rome, Italy, 5-9 September 2011.
Thanks to Jochen Förstner, Thomas Hanisch, Jürgen Helmert, Dmitrii Mironov and Bodo Ritter!
Thank you for your attention!
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Tiled Surface Scheme within the 3d COSMO model: results
Routine COSMO-EU and COSMO-DE
April 2011 May 2011