Is the Stationary Wave Bias in CMIP5 Simulations Driven by Latent Heating Biases?
Is the Stationary Wave Bias in CMIP5 Simulations Driven by Latent Heating Biases?
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DOI：
10.1029/2020gl091678
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发表时间：
2021-02
影响因子：
5.2
通讯作者：
Min-Cheoi Park;Sukyoung Lee
中科院分区：
文献类型：
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作者：
Min-Cheoi Park;Sukyoung Lee
大气驻波在区域气候中起着重要作用。在耦合模式比对项目（CMIP5）第5阶段，已有研究发现，静止涡旋经向风偏置引起的北极水汽入侵存在系统偏置。本研究利用初始值模式计算表明，CMIP5在热带和中纬度地区的潜在加热偏倚在产生向极50°N方向的系统经向风偏倚中发挥了重要作用。进一步表明，中纬度加热偏倚部分是由热带和亚热带加热偏倚引起的环流驱动的。这些结果表明，向极地50°N方向的系统平稳经向风偏倚可以追溯到热带和温带潜热的系统模式偏倚。因此，可靠的区域气候预测很可能取决于所关注区域上游和热带潮湿过程的准确表示。
Atmospheric stationary waves play an important role in regional climate. In phase 5 of the Coupled Model Intercomparison Project (CMIP5), a prior study found that there are systematic biases in Arctic moisture intrusions caused by stationary eddy meridional wind biases. In this study, using initial‐value model calculations, it is shown that CMIP5 latent heating biases in the tropics and midlatitudes play a substantial role in generating the systematic meridional wind bias poleward of 50°N. It is further shown that the midlatitude heating biases are in part driven by the circulation caused by the tropical and subtropical heating biases. These results indicate that the systematic stationary meridional wind biases poleward of 50°N can be traced to systematic model biases in tropical and extratropical latent heating. Therefore, reliable regional climate projections likely hinge on accurate representations of moist processes upstream of the region of interest and in the tropics.