Details

Autor(en) / Beteiligte

• Lebedev, K V
• Yaremchuk, M
• Mitsudera, H
• Nakano, I
• Yuan, G

Titel

Mesoscale Currents in the Kuroshio Extension Region Obtained Through Dynamically Constrained Synthesis of the Acoustic Tomography, Satellite Altimeter and in Situ Data

Ist Teil von

• Eos (Washington, D.C.), 2001-01, Vol.82

Erscheinungsjahr

2001

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• A quasigeostrophic model of an open ocean region is employed to produce a dynamically constrained synthesis of acoustic tomography and satellite altimetry data with in situ observations. The data assimilation algorithm is based upon the 4D variational data interpolation scheme controlled by the model's initial and boundary conditions. The data sets analyzed include direct and differential travel times measured at the array of five acoustic transceivers, Topex/Poseidon altimetry, CTD soundings, and ADCP velocity profiles. The results of assimilation are compared with the statistical inversion of the same travel time data. It is shown that mesoscale variability can be effectively monitored by five transceivers supported by relatively sparse in situ measurements. Analysis of the energy and enstrophy balances of the optimized model solution shows that the mean currents in the region are baroclinically and barotropically unstable. Energy exchange between the depth-averaged and shear components reveals a weak decay of the barotropic mode due to topographic interaction. Potential enstrophy is transferred from the mean to mesoscale currents.