caa a22 4500 60547382X CHVBK 20210128100344.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00382-014-2134-4 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2134-4 Modulation of Aleutian Low and Antarctic Oscillation co-variability by ENSO [Elektronische Daten] [Fei Li, Huijun Wang, Yongqi Gao] We use both the National Centers for Environmental Prediction (NCEP)-National Center for Atmospheric Research (NCAR) reanalysis data (1979-2013) and the Community Atmospheric Model Version 3 to explore the modulation of El Niño-Southern Oscillation (ENSO) on the co-variability of the Aleutian Low (AL) and the Antarctic Oscillation (AAO). The empirical orthogonal function analysis on the NCEP-NCAR reanalysis data indicates that after the late-1990s the global sea level pressure (SLP) and 300-hPa geopotential height (Z300) in boreal January are characterized by the concurrence of the AL and the negative phase of the AAO (−AAO). Associated with this AL-AAO co-variation is a sea surface temperature anomaly that resembles the ENSO cycle. Further analyses reveal that the interdecadal change in ENSO signal (westward extension and more La Niña events) is responsible for the co-variability of AL and AAO after the late-1990s. Correspondingly, the El Niño-related anomalous heating and upward motion over the eastern-central equatorial Pacific can lead to the upper-tropospheric divergence in the western-central Pacific. This upper-tropospheric divergence plays an essential role in coupling the equatorial heat anomalies with the variation of the subtropical westerly jet of both hemispheres, and therefore results in the enhanced meridional circulation of the three cells. It thus implies that ENSO might act as a bridge linking AL and AAO after the late-1990s, causing their consistent co-variability. The numerical experiment also supports this hypothesis. Springer-Verlag Berlin Heidelberg, 2014 Aleutian Low nationallicence Antarctic Oscillation nationallicence El Niño-Southern Oscillation nationallicence Interannual variability nationallicence Li Fei Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut Wang Huijun Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut Gao Yongqi Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut Climate Dynamics Springer Berlin Heidelberg 44/5-6(2015-03-01), 1245-1256 0930-7575 44:5-6<1245 2015 44 382 https://doi.org/10.1007/s00382-014-2134-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2134-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Fei Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut NATIONALLICENCE 700 1- Wang Huijun Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut NATIONALLICENCE 700 1- Gao Yongqi Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/5-6(2015-03-01), 1245-1256 0930-7575 44:5-6<1245 2015 44 382