positive axis

In tropical synoptic analysis, a locus of maximum streamline curvature in an easterly wave; used primarily in the analysis of waves that span the equatorial trough (equatorial waves); a positive axis corresponds to a trough line in the Northern Hemisphere and a ridge line in the Southern Hemisphere.

Related terms:

• axis
• austral axis pole
• positive area
• positive element
• synclinal axis
• c axis
• anticlinal axis
• trade-wind
• positive estuary
• intertropical convergence zone