Gyre models

Figure 4 Tracer results from a two-dimensional gyre model. The model represents the circulation on a constant density surface (isopycnal) in the main thermocline that outcrops along the northern boundary (shaded region). Thermocline ventilation is indicated by the gradual increase of tritium- He ages around the clockwise flowing gyre circulation. TU, tritium unit (1 TU = 1 atom/10 H...

Fig. 12. Asymmetry of the DNA phosphodiester backbone trace as seen in the Oak Ridge NCP structural model (PDB access code lEQZ). No attempt has been made to regularize the geometry of the DNA positions of phosphates are based solely on the experimental electron density. Here the two DNA gyres are overlaid, with the 72 bp ventral gyre in red and the 73 bp dorsal gyre in blue. The minor groove positions facing the histone core are numbered sequentially from the dyad axis. The most pronounced asymmetry is seen in position 2 (10 o clock).

Fig. 15. Temperature factors (B values) for DNA showtrrg areas of structure indetermirracy are represented in a pseudo-color model. Blue represents the lowest temperature factors and red the highest. Each gyre of the DNA is shown, ventral left, dorsal right. The temperature factor is one means of describing the atomic disorder. Sites indicated in red correlate with the holes shown in the previous figure and could be positions of HMGNl binding.

Demonstration in a model simulation that eddy transport is required to transport South Indian subtropical gyre waters across the equator along the western boundary. 

Two dimensional gyre-scale tracer models have been fruitfully applied to observed isopycnal tri-tium- He and chlorofluorocarbon patterns. As shown in Figure 4, recently ventilated water (nearzero tracer age) enters the thermocline on the pole-ward side of the gyre and is swept around the clockwise circulation of the gyre (for a Northern Hemisphere case). Comparisons of model tracer patterns and property-property relationships constrain the absolute ventilation rate and the relative effects of isopycnal advection versus turbulent mixing by depth and region. 

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