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The analysis system uses a climatological reference
both in the standardisation step and in the objective analysis step. An annual
climatology is used in the pre-processing step to convert pressure in depth if
needed and the objective analysis is performed on temperature and salinity
anomalies relatively to a monthly climatology.
The vertical grid for the GLOBAL05 V1.0
configuration is:
0:5:400 / 410:10:2000 / 2020:20:2200 /
2300:100:5800.
The horizontal grid has a resolution of 1/2 of
degree (with Mercator projection). The resolution in latitude is shown on the
figure below.
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| Resolution in latitude
(GLOBAL05 grid) |
The references have been construted from the
monthly global climatology Levitus (NODC (Levitus) Word Ocean Atlas 1998). More
precisely, we used the climatologies prepared for the global 1/4 of degree
configuration of the MERCATOR model (1) to prepare our references on the
horizontal grid and the vertical grid. The parameters of our reference are
summerized below:
| |
parameters |
grid |
| annual climatology |
pressure, density |
GLOBAL05: 1/2°x1/2°
287 levels from 0 o 5800 m |
| monthly climatology |
temperature, salinity, depth |
GLOBAL05: 1/2°x1/2°
287 levels from 0 to 5800 m |
(1) The Levitus98 initial fieds cames from LODYC (1°x1°
on 33 vertical levels), interpolated on the ORCA025 grid, some corrections
on salinity profiles has been done in the Red sea and Levitus-PHC data have been
replaced by Medatlas data (interpolated on ORCA025) in the Mediterranean sea.
The monthly temperature and salinity climatologies are available on the horizontal
grid ORCA025 and on a vertical grid of 46 levels from 3 to 5800 m.
The figure below shows the bathymetry for the GLOBAL05
configuration (constructed from Smith & Sandwel bathymetry, 1997).
The figure below shows the Rossby radius
calculated on a 2°x2° grid with the annual climatology.
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