geostrophic current


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geostrophic current

[¦jē·ō¦sträf·ik ′kə·rənt]
(geophysics)
A current defined by assuming the existence of an exact balance between the horizontal pressure gradient force and the Coriolis force.
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(c) Trajectories of four drifting buoys deployed during the cruise, (d) Meridional geostrophic current referenced to 500 dbar, calculated using ship CTD salinity measured at every 25[degrees] longitude along 8[degrees]N during 15-20 Jul 2016.
The parameters used for the evaluation need the inclusion of the tidal force parameter [F.sub.tide] = [rho].sub.0] [Aw.sup.2] sin wt, where A is the tidal excursion; in this case A should be less than the channel width (A = 20 m) [[rho].sub.0] = 1000 kg/[m.sup.3]; v = 0.01 [m.sup.2]/s is kinematic viscosity, tidal frequency (w = [w.sub.M2] = 1.4052 x [10.sup.-4] rad/s), and earth's rotational angle velocity [OMEGA] = 7.29 x [10.sup.-5] and [alpha] = [pi]/3 as the constant geostrophic current velocity.
4) Geostrophic currents: Geostrophic current estimates show that errors due to pure temperature XBT biases, as estimated for tropical Atlantic currents (Goes et al.
It may be appreciated that COSE completely removes the spurious a geostrophic current present in HY COM at 30[degrees]S (Fig.
The time scales of variability for sea level and geostrophic current were computed using the MTM SVD method and are shown in Figure 6.
Figure 3 shows the evolution of the geostrophic current derived from June 2006 to May 2007.
In accordance with Talley, Pickard, Emery, and Swift (2011), altimetry data from the AVISO program (http://www.aviso.ahimetry.fr/en/data.html) were processed to identify sea level anomalies and geostrophic currents (with 1/3[degrees] resolution); both parameters were plotted using [R]MATLAB 8.1.0.604 software.
Horizontal distribution of a) paralarvae abundance [less than or equal to]2.0 mm ML (circles), mean sea surface level anomaly (cm, colors), and vectors of associated geostrophic currents, b) paralarvae abundance [greater than or equal to]2.0 mm ML (diamonds), mean sea surface level anomaly (cm, colors), and vectors of associated geostrophic currents, c) temperature at the mixed layer depth (MLD), d) chlorophyll-a concentration, e) zooplankton volume (ZV).
where u' and v' = the zonal and meridional components of geostrophic currents, respectively.
These gyres are formed by surface currents that are primarily a combination of Ekman currents driven by local wind and geostrophic currents maintained by the balance between sea level gradients and the Coriolis force.
(2004) demonstrated significant effects (among others) of geostrophic currents generated by sea level anomalies (SLA) and lunar day on swordfish catch and catch per unit of effort (CPUE, number of fish per 1000 hooks).