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Solar modulation of the El‐Niño/Southern Oscillation impact on the Northern Hemisphere annular mode
Author(s) -
Kryjov Vladimir N.,
Park ChungKyu
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl028015
Subject(s) - stratosphere , extratropical cyclone , northern hemisphere , geopotential height , southern hemisphere , climatology , el niño southern oscillation , oscillation (cell signaling) , solar cycle , atmospheric sciences , mode (computer interface) , arctic oscillation , environmental science , geology , physics , meteorology , precipitation , magnetic field , computer science , solar wind , genetics , operating system , quantum mechanics , biology
A statistical study reveals that the stratospheric circulation response to the El‐Niño/Southern Oscillation (ENSO) significantly alters between opposite phases of the 11‐year solar cycle. During solar cycle maxima, the ENSO impact is insignificant throughout the whole extratropical lower stratosphere. During solar cycle minima, the ENSO strongly impacts the lower stratosphere, with the response resembling the Northern Hemisphere annular mode (NAM) pattern in geopotential height fields and in zonal mean zonal flow. It explains the low statistical significance of the relationships between the NAM and ENSO when the data are not stratified according to solar cycle maximum and minimum.