## 1pAO2. Optimization of the inverse estimator for reconstructed temperature and current fields.

### Session: Monday Afternoon, December 2

### Time: 2:25

**Author: Iwao Nakano**

**Location: Ocean Res. Dept., JAMSTEC, 2-15 Nastushima-cho, Yokosuka, 237 Japan**

**Abstract:**

The inverse scheme is not optimized under the formalized condition in
solving an inverse problem of ocean acoustic tomography. But if how the travel
time bias can affect the reconstructed profiles is examined, it is useful to
determine the optimal bias for each inversion. There are two methods to
determine this bias. One is to minimize the variance of the sound-speed anomaly
as a function of travel time bias. The other is to use the formula derived by
the minimization of the variance of the difference of true and estimated
sound-speed anomalies. Even though both results must agree with each other in
principle, they are not always the same. In examining the discrepancy, the
assumption can be made that the inverse scheme is optimal which minimizes the
difference of both biases. Moreover, the travel time bias makes it possible to
treat with barotropic mode of current and temperature separated from baroclinic
modes.

ASA 132nd meeting - Hawaii, December 1996