Decadal Variability of North Pacific Eastern Subtropical Mode Water

作者：Guo, Yongqing; Lin, Xiaopei^*; Wei, Meng; Liu, Cong; Men, Guang

来源：JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2018, 123(9): 6189-6206.

DOI：10.1029/2018JC013890

• GENERAL-CIRCULATION MODEL
• HIGH-RESOLUTION GCM
• WINTER MIXED-LAYER
• MASS FORMATION
• SUBDUCTION RATE
• OCEAN
• TEMPERATURE
• ANOMALIES
• RATES
• TRANSFORMATION

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 high-resolution 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 degrees-36 degrees N, 160 degrees-120 degrees W) between 1992 and 2016. Results show that NPESTMW is formed through subduction of low potential vorticity (PV) water. This low-PV 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 Oscillation-induced decadal anomaly of air-sea buoyancy flux. This decadal buoyancy flux anomaly drives the decadal anomaly of mixed layer depth change, then causes anomalous subduction, and leads to anomalous low-PV water subduction. The decadal NPESTMW volume anomaly is finally generated by this anomalous low-PV water subduction.

• 出版日期2018-9
• 单位国家海洋局第一海洋研究所; 中国海洋大学; 中国科学院海洋研究所