Figure 7: Isopycnal PV on the core layer of STMW in March for climate model and gridded and ungridded raw data of Argo.
From: Observing mesoscale eddy effects on mode-water subduction and transport in the North Pacific
(a) A randomly selected CMIP5 climate model (HadGEM2-CC), where eddies are parameterized. (b) Gridded observations based on Argo-profiling floats; the streamlines (acceleration potential, CI=0.5 m2 s−2) are superimposed as black contours, and the winter MLD front (MLD=150 m contour) in thick magenta line. (c) The ungridded raw data of Argo, along with the mean dynamical topography (CI=10 cm). (d) PDF (%) of March isopycnal PV based on the Argo data for 2004–2014. Region for the calculation is denoted by the thick dashed rectangle in c. If we define the STMW using the critical PV value of 2.5 × 10−10m−1s−1, ∼49% of Argo-profiling floats do not contain STMW in its formation region in March (grey shading in d).
