caa a22 4500 605474311 CHVBK 20210128100347.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00382-014-2133-5 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2133-5 The influence of ENSO on the equatorial Atlantic precipitation through the Walker circulation in a CGCM [Elektronische Daten] [Wataru Sasaki, Takeshi Doi, Kelvin Richards, Yukio Masumoto] The link between El Niño/Southern Oscillation (ENSO) and the equatorial Atlantic precipitation during boreal spring (March-April-May) is explored using a coupled general circulation model (CGCM). Interannual variability of the equatorial Atlantic sea surface temperature (SST) in the CGCM is excluded by nudging the modeled SST toward the climatological monthly mean of observed SST in the equatorial Atlantic, but full air-sea coupling is allowed elsewhere. It is found that the equatorial Atlantic precipitation is reduced (increased) during El Niño (La Niña) in the case where the interannual variability of the equatorial Atlantic SST is disabled. The precipitation anomalies in the equatorial Atlantic during ENSO are not strongly associated with the meridional migration of the Atlantic inter-tropical convergence zone. We find the reduced precipitation in the equatorial Atlantic during El Niño is associated with an enhanced Atlantic Walker circulation characterized by strengthened low-level easterlies and anomalous dry, downward winds over the equatorial Atlantic, while the Pacific Walker circulation is weakened. The upper-level anomalous westerlies over the equatorial Atlantic are consistent with a Matsuno-Gill-type response to heating in the eastern equatorial Pacific. Our results of the CGCM experiments suggest that changes to the Walker circulation induced by ENSO contribute significantly to changes in precipitation over the equatorial Atlantic. Springer-Verlag Berlin Heidelberg, 2014 ITCZ nationallicence ENSO nationallicence Equatorial Atlantic nationallicence Coupled general circulation model nationallicence Sasaki Wataru Center for Earth Information Science and Technology, Japan Agency for Marine Earth Science and Technology, 3173-25 Kanazawa-ku, Showa-machi, Yokohama, Kanagawa, Japan aut Doi Takeshi Application Laboratory, Japan Agency for Marine Earth Science and Technology, Yokohama, Japan aut Richards Kelvin International Pacific Research Center/SOEST, University of Hawaii at Manoa, Honolulu, HI, USA aut Masumoto Yukio Application Laboratory, Japan Agency for Marine Earth Science and Technology, Yokohama, Japan aut Climate Dynamics Springer Berlin Heidelberg 44/1-2(2015-01-01), 191-202 0930-7575 44:1-2<191 2015 44 382 https://doi.org/10.1007/s00382-014-2133-5 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/s00382-014-2133-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sasaki Wataru Center for Earth Information Science and Technology, Japan Agency for Marine Earth Science and Technology, 3173-25 Kanazawa-ku, Showa-machi, Yokohama, Kanagawa, Japan aut NATIONALLICENCE 700 1- Doi Takeshi Application Laboratory, Japan Agency for Marine Earth Science and Technology, Yokohama, Japan aut NATIONALLICENCE 700 1- Richards Kelvin International Pacific Research Center/SOEST, University of Hawaii at Manoa, Honolulu, HI, USA aut NATIONALLICENCE 700 1- Masumoto Yukio Application Laboratory, Japan Agency for Marine Earth Science and Technology, Yokohama, Japan aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/1-2(2015-01-01), 191-202 0930-7575 44:1-2<191 2015 44 382