[特邀报告]Revisiting connection between ENSO and the following spring north tropical Atlantic SST anomalies

Revisiting connection between ENSO and the following spring north tropical Atlantic SST anomalies
编号:1174 稿件编号:52 访问权限:仅限参会人 更新:2024-04-11 12:24:13 浏览:313次 特邀报告

报告开始:2024年05月20日 09:52 (Asia/Shanghai)

报告时间:16min

所在会议:[S12] 主题12、大气物理与气象气候 » [S12-10] 主题12、大气物理与气象气候 专题12.7(20日上午,4F国际会议厅)

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摘要
The north tropical Atlantic (NTA) displays significant sea surface temperature anomalies (SSTA) during the ENSO decaying spring. We find that this is not always true for El Niño with moderate intensity. Nearly half of the moderate El Niño cases are followed by the strong NTA SSTAs, but others are followed by the weak NTA SSTAs, indicating the uncertainty in the connection between the moderate El Niño and the NTA. Further analysis demonstrates that El Niño, which is accompanied by the strong (weak) Aleutian low leads to the strong (weak) NTA SSTAs, suggesting that the role of the Aleutian low must be considered to fully understand the El Niño–NTA connection.
Moreover, the decadal variability in the interannual relationship between ENSO and the NTA SSTA are also examined. We identify a largely weakened impact of ENSO on the SSTA concentrated over the northeast tropical Atlantic (NETA) after the mid-1980s, while the impacts on the SSTA over the northwest tropical Atlantic (NWTA) are stable during the whole period. Further analysis indicates that the decadal changes in the ENSO–NETA connection are due to the westward shift in the ENSO-related convection and teleconnections, resulting from the westward shift of Pacific Walker circulation, induced by the intensified zonal SST gradient over the equatorial Pacific after the mid-1980s.
关键字
ENSO,north tropical Atlantic SST,Interannual variability,interdecadal change
报告人
陈卫
副研究员 中国科学院大气物理研究所

稿件作者
陈卫 中国科学院大气物理研究所
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