Decadal Variability of North Pacific Eastern Subtropical Mode Water


Title: c

Journal: Journal of Geophysical Research: Oceans, 6189-6206, doi: 10.1029/2018JC013890

Authors: GUO Y. -Q., X. -P. Lin*, M. Wei, C. Liu, and G. Men

Abstract: A significant decadal variability of the North Pacific Eastern Subtropical Mode Water (NPESTMW), related to the Pacific Decadal Oscillation, is identified from the gridded Argo and EN4 observational data sets. To investigate the decadal variability of the NPESTMW volume, the highresolution Estimating the Circulation and Climate of the Ocean, Phase II simulation is used to diagnose the volume budget of the NPESTMW density layer in the NPESTMW formation region (20°–36°N, 160°–120°W) between 1992 and 2016. Results show that NPESTMW is formed through subduction of low potential vorticity (PV) water. This lowPV water subduction is mainly determined by mixed layer depth change and lateral induction, which account for approximately 58% and 32%, respectively. The decadal NPESTMW volume anomaly is originated from the Pacific Decadal Oscillationinduced decadal anomaly of airsea buoyancy flux. This decadal buoyancy flux anomaly drives the decadal anomaly of mixed layer depth change, then causes anomalous subduction, and leads to anomalous lowPV water subduction. The decadal NPESTMW volume anomaly is finally generated by this anomalous lowPV water subduction.