data sets > ROMS model
 ROMS Model
Data on sea level anomaly (SLA), mixed layer depth (MLD), and temperature, salinity, and current velocity were obtained at 3 different depths (surface, below MLD, and bottom) from a Regional Ocean Modelling System (ROMS) model developed by Al Hermann and colleagues (Hermann et al. 2002; Hermann and Stabeno 1996) for the northern Gulf of Alaska. The model uses a rotated coordinate grid with a nominal resolution of 3x3 km2. The data presented are based on a run for the 2001 calendar year, obtained as NetCDF files.
The data are provided as a series of 28 tables in an MS Access database. Each table is comprised of 230,400 records, each representing a model point. Each record contains its geographic coordinate, and a value for all the variables for the specific time period. The tables contain one column per attribute. The column headers are described below. The variables obtained from the ROMS model (Table 1) were provided as 2-week averages for the year 2001 (Table 2).
Table 1: Date ranges for the 2-week averages obtained from the Hermann circulation model output.
Variable |
Description |
GridID,
id |
GridID:
The link to the study area grid; id: The internal ROMS identifier. |
lon,
lat |
Geographic
coordinates to 2 decimal places. |
mask |
Marine
areas masked as valid (1) or invalid (0) based on flags in the velocity
fields. The delivered file contains only the valid points, and therefore all
values should be 1. |
SLA |
Sea
level anomaly (cm) |
MLD |
Mixed
layer depth as calculated algorithmically by the ROMS model. |
Dmld |
Depth
of model layer below the calculated mixed layer depth. |
Tsurf,
Tbot, Tmld |
Temperature
(°C) at surface, bottom, and depth below MLD. |
Ssurf,
Sbot, Smld |
Salinity
(psu) at surface, bottom, and depth below MLD. |
Usurf,
Vsurf, Wsurf
Ubot, Vbot, Wbot
Uamld, Vamld, Wamld,
Ubmld, Vbmld, Wbmld |
Velocity
components (U, V, W) at surface, bottom, and at levels both above (amld) and
below (bmld) the MLD model level. Velocities are in m/s, but note that
vertical (W) velocities are several orders of magnitude smaller. |
|
|
|
Table 2: Date ranges for the 2-week averages obtained from the Hermann circulation model output.
Period |
Start |
End |
Period |
Start |
End |
1 |
2000-12-14 |
2000-12-27 |
15 |
2001-06-28 |
2001-07-11 |
2 |
2000-12-28 |
2001-01-10 |
16 |
2001-07-12 |
2001-07-25 |
3 |
2001-01-11 |
2001-01-24 |
17 |
2001-07-26 |
2001-08-08 |
4 |
2001-01-25 |
2001-02-07 |
18 |
2001-08-09 |
2001-08-22 |
5 |
2001-02-08 |
2001-02-21 |
19 |
2001-08-23 |
2001-09-05 |
6 |
2001-02-22 |
2001-03-07 |
20 |
2001-09-06 |
2001-09-19 |
7 |
2001-03-08 |
2001-03-21 |
21 |
2001-09-20 |
2001-10-03 |
8 |
2001-03-22 |
2001-04-04 |
22 |
2001-10-04 |
2001-10-17 |
9 |
2001-04-05 |
2001-04-18 |
23 |
2001-10-18 |
2001-10-31 |
10 |
2001-04-19 |
2001-05-02 |
24 |
2001-11-01 |
2001-11-14 |
11 |
2001-05-03 |
2001-05-16 |
25 |
2001-11-15 |
2001-11-28 |
12 |
2001-05-17 |
2001-05-30 |
26 |
2001-11-29 |
2001-12-12 |
13 |
2001-05-31 |
2001-06-13 |
27 |
2001-12-13 |
2001-12-26 |
14 |
2001-06-14 |
2001-06-27 |
28 |
2001-12-27 |
2002-01-09 |
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