An evaluation of tropical waves and wave forcing of the QBO in the QBOi models

An evaluation of tropical waves and wave forcing of the QBO in the QBOi models
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QBOi 模型中热带波和 QBO 波浪强迫的评估

DOI:
10.1002/qj.3827
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发表时间:
2020
影响因子:
8.9
通讯作者:
K.)
K.)
中科院分区:
地球科学3区
文献类型:
--
作者:
Holt;L.A.;Lott;F.;Garcia;R.R.;Kiladis;G.N.;et al. (13th Kawatani;Y.;25th Yoshida;K.)

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本文分析了参与平流层-对流层过程第1阶段模式的平流层波及其在气候中的作用(SPARC)准双年振荡倡议(QBOi)。所有模式在50 hPa的风和温度下都具有稳健的开尔文和混合罗斯比-重力波模式,并且比大多数耦合模式比较项目第5阶段(CMIP5)模式更好地代表它们。这些模型之间仍然存在一些差异,特别是关于混合罗斯比-重力波的模型。我们将赤道波在QBOi模式中的变化部分归因于水平和垂直分辨率的变化,纬向风的系统偏差,以及对流层对流耦合波在模式中的相当大的变化:只有大约一半的QBOi模式具有真实的对流耦合开尔文波,只有少数模式具有对流耦合混合罗斯比-重力波。强对流耦合波的模式由于QBO区域的分解波,往往产生较大的纬向平均强迫。最后对QBOi模型中解析波的elassen - palm (EP)通量和EP通量散度进行了计算。研究发现,QBO区域的分解波强迫具有较大的扩散性,且分解波强迫与模式垂直分辨率有较强的相关性。
We analyze the stratospheric waves in models participating in phase 1 of the Stratosphere–troposphere Processes And their Role in Climate (SPARC) Quasi‐Biennial Oscillation initiative (QBOi). All models have robust Kelvin and mixed Rossby‐gravity wave modes in winds and temperatures at 50 hPa and represent them better than most of the Coupled Model Intercomparison Project Phase 5 (CMIP5) models. There is still some spread among the models, especially concerning the mixed Rossby‐gravity waves. We attribute the variability in equatorial waves among the QBOi models in part to the varying horizontal and vertical resolutions, to systematic biases in zonal winds, and to the considerable variability in convectively coupled waves in the troposphere among the models: only roughly half of the QBOi models have realistic convectively coupled Kelvin waves and only a few models have convectively coupled mixed Rossby‐gravity waves. The models with stronger convectively coupled waves tend to produce larger zonal mean forcing due to resolved waves in the QBO region. Finally we evaluate the Eliassen–Palm (EP) flux and EP flux divergence of the resolved waves in the QBOi models. We find that there is a large spread in the forcing from resolved waves in the QBO region, and the resolved wave forcing has a robust correlation with model vertical resolution.
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