Covariability of western tropical Pacific-North Pacific atmospheric circulation during summer
- Authors
- Yun, Kyung-Sook; Yeh, Sang-Wook; Ha, Kyung-Ja
- Issue Date
- Nov-2015
- Publisher
- Nature Publishing Group
- Citation
- Scientific Reports, v.5, pp.1 - 7
- Indexed
- SCIE
SCOPUS
- Journal Title
- Scientific Reports
- Volume
- 5
- Start Page
- 1
- End Page
- 7
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/16510
- DOI
- 10.1038/srep16980
- ISSN
- 2045-2322
- Abstract
- North Pacific subtropical high (NPSH) is permanent high-pressure system over the Northern Pacific Ocean and it extends to the western North Pacific during the boreal summer (June-July-August), which is so called the western North Pacific subtropical high (WNPSH). Here, we examine the covariability of the NPSH-WNPSH during summer using both observation and Coupled Model Intercomparison Project phase 5 (CMIP5) model data. The statistical analyses indicate that the NPSH-WNPSH covariability shows significant decadal variability in the observations, in addition, the in-phase relationship of NPSH-WNPSH is enhanced after the mid-to-late 1990s. A dipole-like sea surface temperature (SST) pattern, i.e., a warming in the western Pacific and a cooling in the eastern Pacific, is dominant after the mid-to-late 1990s, which acts to enhance the covariability of NPSH-WNPSH by modulating the atmospheric teleconnections. However, the covariability of NPSH-WNPSH in the future climate is not much influenced by the anthropogenic forcing but it is largely characterized by the natural decadal-to-interdecadal variability, implying that the enhancement of NPSH-WNPSH covariability after the mid-to-late 1990s could be considered as part of decadal-to-interdecadal variability.
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