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Next: 8.1.2 Hydrographic constraints
Up: 8.1 The ECCO state
Previous: 8.1 The ECCO state
Contents
Subsections
Altimetric SSH contributions from T/P and ERS-1/2 are four-fold:
- an time mean SSH misfit between
model and T/P
- daily SSH anomaly misfits between T/P and model
- daily SSH anomaly misfits between ERS-1/2 and model
- daily absolute SSH misfit between T/P and model,
weighted by the full geoid error covariance.
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field |
file name |
deccription |
unit |
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psbar |
psbarfile |
daily model mean SSH fields |
[m] |
tpmean |
topexmeanfile |
T/P mean |
[cm] |
tpobs |
topexfile |
daily T/P SSH anomalies |
[cm] |
erspobs |
ersfile |
daily ERS-1/2 SSH anomalies |
[cm] |
wp |
geoid_errfile |
diagonal of geoid error covariance |
[m] |
wtp, wers |
ssh_errfile |
rms of SSH anomalies |
[cm] |
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- Compute model mean spatial distribution
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(8.1) |
- Compute global offset between model and T/P mean:
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(8.2) |
- Misfits are computed w.r.t. global .
First spatial distribution:
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(8.3) |
Finally, sum over all spatial entries:
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(8.4) |
Computation is same for T/P and ERS-1/2.
Here we write out computation for T/P.
- Compute difference in anomalies:
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(8.5) |
where denotes time (day) index, and
where it is assumed that mean T/P spatial distribution
has already been removed from data
!
- Sum over all spatial points and all times
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(8.6) |
cost_ssh
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|- < compute nYears model mean >
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|- < read nYears T/P mean >
| CALL COST_READTOPEXMEAN
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|- < compute global T/P vs. model offset >
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|- < compute cost_hmean >
| CALL COST_SSH_MEAN
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|- < ... >
- All data are currently masked to zero where less than 13 depth levels,
mimicing no contribution for depth less than 1000m.
- term in weights is set to 1.
- bad T/P and ERS-1/2 values are flagged
- T/P and ERS-1/2 data
cm are flagged as bad values
- is read from geoid_errfile
and is pre-computed in ecco_cost_weights
is pre-computed in ecco_cost_weights;
is read from geoid_errfile;
, are pre-computed in ecco_cost_weights;
- , are read from single ssh_errfile
- both are converted to meters and halved
- ERS error is set to T/P error + 5cm
- Map out
- Map out
averaged over 1 month, i.e.
- sum over daily entries and plot daily average as function of time. i.e.
Next: 8.1.2 Hydrographic constraints
Up: 8.1 The ECCO state
Previous: 8.1 The ECCO state
Contents
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Massachusetts Institute of Technology |
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