The most sensitive initial error modes modulating intensities of CP- and EP- El Niño events

The most sensitive initial error modes modulating intensities of CP- and EP- El Niño events
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最敏感的初始误差模式调节 CP- 和 EP- 厄尔尼诺事件的强度

DOI:
10.1016/j.dynatmoce.2021.101257
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发表时间:
2021-12
影响因子:
1.7
通讯作者:
Hui Xu
Hui Xu
中科院分区:
地球科学4区
文献类型:
--
作者:
Qianqian Qi;Wansuo Duan;Hui Xu

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检查了地球物理流体动力学实验室气候模型版本 2p1 (GFDL CM2p1) 模型模拟的两种类型的厄尔尼诺事件及其“春季可预测性障碍”(SPB) 关联。通过对整个太平洋海温进行集合后报实验,中部型厄尔尼诺和东部型厄尔尼诺的预测均显示出显着的SPB现象,但中部型厄尔尼诺的SPB较东部型厄尔尼诺弱得多。进一步分析表明,对于中部型厄尔尼诺事件,北太平洋的三重形状初始海温误差,即负维多利亚模态(VM),在Niño4区域引起了最大的预测误差,并调节了中部型厄尔尼诺事件的强度。而东部型厄尔尼诺事件中,经向模态的赤道西太平洋次表层和东南太平洋上层(15°S-30°S)初始海温误差对Niño3区域的预测误差最大,并调节了东部型厄尔尼诺事件的强度。显然,结果强调,为了减少最终的预报误差,获得更好的两类厄尔尼诺事件强度预报,不仅要重点关注西赤道太平洋次表层的初始海温精度,还要关注东南太平洋表层和北太平洋类VM模态覆盖区域的初始海温精度。
The two types of El Niño events simulated by the Geophysical Fluid Dynamics Laboratory Climate Model version 2p1 (GFDL CM2p1) model and its “spring predictability barrier” (SPB) associations are examined. By conducting the ensemble hindcast experiments related to the sea temperature on the whole Pacific, both of the predictions for CP- and EP-El Niño show a significant SPB phenomenon, but the CP-El Niño features a much weaker SPB compared to the EP-El Niño. Further analyses revealed that, for CP-El Niño events, the initial sea temperature errors of the North Pacific with triple-like shape, referred to as negative Victoria Mode (VM) induces the largest prediction errors in Niño4 areas and modulates the intensities of CP-El Niño events. While for EP-El Niño events, the initial sea temperature errors in the subsurface layer of the western equatorial Pacific and the upper layer of the Southeast Pacific (15ºS-30ºS) with the meridional mode induce the largest prediction errors in Niño3 areas and modulates the intensities of EP-El Niño events. Obviously, results stress that, in order to reduce final prediction errors and obtain better predictions in terms of intensity on the two types of El Niño events, we should mainly focus on initial sea temperature accuracy in not only the subsurface layer of the west equatorial Pacific but also the surface layer of southeast Pacific and the region covered by the VM-like mode in the North Pacific.
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