Impact of ENSO on MJO Pattern Evolution over the Maritime Continent
Impact of ENSO on MJO Pattern Evolution over the Maritime Continent
复制标题
ENSO 对海洋大陆 MJO 模式演化的影响
DOI：
10.1007/s13351-020-0046-2
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发表时间：
2020-12
影响因子：
3.2
通讯作者：
Hu Feng
中科院分区：
文献类型：
--
作者：
Liu Jia;Da Yuqin;Li Tim;Hu Feng
通过观测和数值模拟相结合的方法，研究了厄尔尼诺-南方涛动（ENSO）对海洋大陆（MC）上空MJO型演变的调制作用：在东太平洋（EP）厄尔尼诺冬季，MJO对流分支在MC上空向赤道以南移动，而在拉尼娜冬季，它相对于赤道变得对称。另一方面，中太平洋（CP）厄尔尼诺现象对MJO模式的影响，结果表明，ENSO引起的背景水汽和垂直切变的变化可能是造成MJO型演变的主要原因。结果表明，背景湿度变化起主导作用。柱积分湿静力能的观测诊断结果表明，MJO型的差异是由于EP El Nino和La Nina之间MJO对流前MSE趋势的不对称性造成的，MJO尺度异常纬向风的差异最终受控于与EP El Nino和La Nina相关的背景纬向水汽梯度的变化。
The modulation of Madden–Julian oscillation (MJO) pattern evolution over the Maritime Continent (MC) by El Nino–Southern Oscillation (ENSO) was investigated through a combined observational and modeling study.MJO convective branches shifted south of the equator over the MC during eastern Pacific (EP) El Nino winters,while it became relatively symmetric about the equator during La Nina winters.The impact of central Pacific (CP) El Ninos to MJO pattern,on the other hand,is not statistically significant.The cause of the distinctive MJO pattern evolutions is likely attributed to the ENSO-induced changes of the background moisture and vertical shear over the MC.Idealized numerical experiments with a 2.5-layer model were carried out,and the result revealed that the background moisture change played a dominant role.An observational diagnosis of column-integrated moist static energy (MSE) budgets was further conducted.The result indicated that the MJO pattern difference was attributed to the MSE tendency asymmetry in front of MJO convection between EP El Nino and La Nina,caused by the advection of the mean MSE by anomalous meridional wind.The difference in the MJO-scale anomalous meridional wind was ultimately controlled by the change of the background meridional moisture gradient associated with EP El Nino and La Nina.
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影响因子：
4.9
作者：
Ailan Lin;Tim Li
通讯作者：
Ailan Lin;Tim Li
影响因子：
4.6
作者：
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影响因子：
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作者：
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影响因子：
3.2
作者：
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通讯作者：
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影响因子：
3.1
作者：
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通讯作者：
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