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Changes in the Relationship between ENSO and Asia-Pacific Midlatitude Winter Atmospheric Circulation.
- Source :
- Journal of Climate; May2013, Vol. 26 Issue 10, p3377-3393, 17p, 9 Graphs, 7 Maps
- Publication Year :
- 2013
-
Abstract
- Interdecadal changes in the relationship between El Niño-Southern Oscillation (ENSO) and midlatitude atmospheric circulation are investigated in this study. Comparison of associations between ENSO and midlatitude atmospheric circulation anomalies between 1958-76 and 1977-2010 suggest that during 1958-76, ENSO exerted a strong impact on the East Asian winter monsoon (EAWM) and the associated atmospheric circulation pattern was similar to the positive North Pacific Oscillation (NPO). In contrast, during 1977-2010, the NPO-like atmospheric pattern disappeared. Instead, ENSO exerted a strong impact on the eastern North Pacific Ocean (NP) and North America, and the associated atmospheric circulation pattern resembled the Pacific-North America (PNA) teleconnection. Also, significant correlations between ENSO and sea surface temperature anomalies (SSTAs) over the western subtropical NP during 1958-76 became insignificant during 1977-2010, whereas negative correlations between ENSO and SSTAs in the central and northeastern subtropical NP became more significant since the mid-1970s. Further analyses suggest that the interdecadal shift of the Aleutian low, which occurred around the mid-1970s, might be responsible for the identified changes. Before the mid-1970s, warm ENSO events generated an anomalous anticyclone over the western NP, which is a key system bridging ENSO and EAWM-related atmospheric circulation. After the mid-1970s, the Aleutian low intensified and shifted eastward, leading to the impact of ENSO prevailing over the eastern NP. In addition, the weakened (strengthened) ENSO-NPO/EAWM (ENSO-PNA) relationship likely contributed to the weakened (strengthened) relationship between ENSO and SSTAs over the western (central and eastern) subtropical NP. [ABSTRACT FROM AUTHOR]
- Subjects :
- SOUTHERN oscillation
ATMOSPHERIC circulation
MONSOONS
OCEAN temperature
Subjects
Details
- Language :
- English
- ISSN :
- 08948755
- Volume :
- 26
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Journal of Climate
- Publication Type :
- Academic Journal
- Accession number :
- 87499346
- Full Text :
- https://doi.org/10.1175/JCLI-D-12-00355.1