EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Analysis of the differences between the North Pacific Victoria and meridional modes

Kai Ji1,2, Hongchao Zuo2, Jianping Li3, and Ruiqiang Ding1
Kai Ji et al.
  • 1Institute of Atmospheric Physics,Chinese Academy of Sciences, State key laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics, China (
  • 2College of Atmospheric Sciences, Lanzhou University, Lanzhou China
  • 3Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao China

The Victoria mode (VM) and Pacific meridional mode (PMM) are the dominant SST modes over the North Pacific. Both are forced by a North Pacific Oscillation (NPO)-like extratropical atmospheric variability, and can act as a bridge (or conduit) through which North Pacific extratropical atmospheric variability influences ENSO. Consequently, the VM shares some resemblance with the PMM. However, the VM and PMM differ in terms of their spatial structure, temporal variations, and impacts on ENSO. In contrast to the local SST mode of the PMM in the subtropical northeast Pacific, the VM, as a basin-scale SST mode of the North Pacific basin, includes large-amplitude SSTAs over the northeast Pacific, the western North Pacific (WNP), and the high-latitude North Pacific. Results indicate that SLP anomalies associated with the VM are generally located west of those associated with the PMM. In addition, the VM has a unique temporal variability, independent of the PMM. Furthermore, the VM is more closely linked to ENSO than is the PMM, possibly because the VM combines the effects of the PMM and SSTAs in the WNP. Thus, the VM represents a more reliable precursor signal than the PMM for ENSO events and may have profound implications for ENSO prediction.

How to cite: Ji, K., Zuo, H., Li, J., and Ding, R.: Analysis of the differences between the North Pacific Victoria and meridional modes, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-3886,, 2020

This abstract will not be presented.