39.9.9 Overturning streamfunction in the $(\phi ,\rho ^{neutral})$ plane

Another vertical coordinate which is quite useful is the neutral density coordinate of Jackett and McDougall (1997). The paper by Hirst, McDougall, and Jackett (1996) illustrates the utility of this coordinate for globally diagnosing mechanisms of water mass transformation. The $(\phi ,\rho ^{neutral})$ plane streamfunction requires the software of Jackett and McDougall (1997), which is not provided with MOM.