source: NEMO/branches/2020/dev_r12563_ASINTER-06_ABL_improvement/tests/STATION_ASF/README.md

Last change on this file was 13159, checked in by gsamson, 3 months ago

merge trunk@r13136 into ASINTER-06 branch; pass all SETTE tests; results identical to trunk@r13136; ticket #2419

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1
2## WARNING: TOTALLY-ALPHA-STUFF / DOCUMENT IN THE PROCESS OF BEING WRITEN!
3
4NOTE: if working with the trunk of NEMO, you are strongly advised to use the same test-case but on the `NEMO-examples` GitHub depo:
5https://github.com/NEMO-ocean/NEMO-examples/tree/master/STATION_ASF
6
7
8# *Station Air-Sea Fluxes* demonstration case
9
10## Objectives
11
12```STATION_ASF``` is a demonstration case that mimics an in-situ station (buoy, platform) dedicated to the estimation of surface air-sea fluxes by means of the measurement of traditional meteorological surface parameters.
13
14```STATION_ASF``` is based on the merging of the "single column" and the "standalone surface module" configurations of NEMO. In short, it coulb defined as "SAS meets C1D". As such, the spatial domain of ```STATION_ASF``` is punctual (1D, well actually 3 x 3 as in C1D).
15
16```STATION_ASF``` is therefore a versatile tool, and extremely light in terms of computing requirements, to test the different bulk algorithms and cool-skin/warm-layer parameterization options included in NEMO.
17
18As input ```STATION_ASF``` will require the traditional *bulk* sea surface parameters:
19
20- sea surface temperature (SST) at $z_{SST}$ meters below the surface
21- Surface current vector
22- Sea surface salinity
23
24as well as the usual surface atmospheric state:
25
26- air temperature at $z_t$ meters above the surface
27- air humidity  at $z_t$ meters above the surface (specific humidity or relative humidity or dew-point temperature)
28- wind speed vector at $z_u$ meters above the surface
29- Sea level atmospheric pressure (SLP)
30- Downwelling solar radiation
31- Downwelling longwave radiation
32
33
34
35## Physical description
36
37### Important namelist parameters speficic to STATION_ASF
38
39* ```rn_dept1@namusr_def:``` depth (m) at which the prescribed SST is taken (i.e. depth of first T-point); important due to impact on warm-layer estimate, the deeper, the more pronounced!
40
41* ```rn_lat1d,rn_lon1d@namc1d:``` fixed coordinates of the location of the station (buoy, platform, etc).
42
43* ```namsbc_blk:``` to be filled carefully, just as for "C1D", the prescribed surface ATMOSPHERIC state (files) are time series of shape 3x3 in space
44
45* ```namsbc_sas:``` to be filled carefully, just as for "C1D", the prescribed surface OCEAN state (files) are time series of shape 3x3 in space
46
47
48
49## Input files to test STATION ASF
50
51Three full years of processed hourly data from the PAPA station (buoy) can be downloaded here:
52https://drive.google.com/file/d/1MxNvjhRHmMrL54y6RX7WIaM9-LGl--ZP/
53
54These three files are everything you need to play with the set of namelists provided for this test-case.
55
56- ```Station_PAPA_50N-145W_atm_hourly.nc```  → contains hourly surface atmospheric state
57- ```Station_PAPA_50N-145W_precip_daily.nc``` → contains daily precipitation
58- ```Station_PAPA_50N-145W_oce_hourly.nc``` → contains hourly sea surface state
59
60For station PAPA (50.1 N, 144.9 W), air temperature and humidity are measured at 2.5 m, the wind speed at 4 m, and the SST at 1 m below the surface, hence the following namelist parameters are given:
61
62- ```rn_dept1 =    1.  ``` (&namusr_def)
63- ```rn_lat1d =  50.1 ``` (&namc1d)
64- ```rn_lon1d = 215.1``` (&namc1d)
65- ```rn_zqt   =   2.5``` (&namsbc_blk)
66- ```rn_zu    =    4.``` (&namsbc_blk)
67
68
69
70## Playing with STATION_ASF
71
72First compile the test-case as follows (compile with xios-2.5 support → check your ARCH file):
73
74```./makenemo -m <your_arch> -n STATION_ASF -j 4 -a STATION_ASF```
75
76Then you can use the script ``launch_sasf.sh`` found in  ```EXPREF/``` to launch 3 simulations (one for each bulk parameterization available). You need to adapt the following variable to your environment in the script:
77
78- ```NEMO_DIR``` : NEMO root directory where to fetch compiled STATION_ASF ```nemo.exe``` + setup (such as ```${NEMO_DIR}/tests/STATION_ASF```)
79
80- ```WORK_DIR``` :  Directory where to run the simulation
81
82- ```FORC_DIR```  Directory containing sea-surface + atmospheric forcings (get it there https://drive.google.com/file/d/1MxNvjhRHmMrL54y6RX7WIaM9-LGl--ZP/)
83
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