[特邀报告]A very likely weakening of Pacific Walker Circulation in constrained near-future projections

A very likely weakening of Pacific Walker Circulation in constrained near-future projections
编号:3315 稿件编号:1008 访问权限:私有 更新:2023-04-26 15:37:33 浏览:326次 特邀报告

报告开始:2023年05月08日 08:15 (Asia/Shanghai)

报告时间:15min

所在会议:[13A] 13A、大气物理与气象气候 » [13A-3] 13A-3 季节内至年代际气候变异

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摘要
The observational records have shown a strengthening of the Pacific Walker circulation (PWC) since 1979. However, whether the observed change is forced by external forcing or
internal variability remains inconclusive, a solid answer to more societal relevantly question of how the PWC will change in the near future is still a challenge. Here we perform a
quantitative estimation on the contributions of external forcing and internal variability to the recent observed PWC strengthening using large ensemble simulations from six state-of-theart Earth system models. We find the phase transition of the Interdecadal Pacific Oscillation (IPO), which is an internal variability mode related to the Pacific, accounts for approximately 63% (~51–72%) of the observed PWC strengthening. Models with sufficient ensemble members can reasonably capture the observed PWC and IPO changes. We further constrain the projection of PWC change by using climate models’ credit in reproducing the historical phase of IPO. The result shows a high probability of a weakened PWC in the near future.
关键字
Walker Cir,IPO,Attrib
报告人
巫明娜
中国地质大学(武汉)

稿件作者
巫明娜 中国地质大学(武汉)
周天军 中国科学院大气物理研究所
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庄艳华(13349889826;zhuang@apm.ac.cn)
李星华(15527964369;lixinghua5540@whu.edu.cn)
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