Improved Atlantic winter blocking in a climate model
Improved Atlantic winter blocking in a climate model
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DOI：
10.1029/2011gl049573
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发表时间：
2011-12-15
影响因子：
5.2
通讯作者：
Williams, Keith
中科院分区：
文献类型：
--
作者：
Scaife, Adam A.;Copsey, Dan;Williams, Keith
大多数气候模型都低估了大西洋阻塞的频率。水平分辨率通常被认为是主要的罪魁祸首，因为低分辨率的小尺度变异性的高分辨率效应有助于维持块。然而，最近的研究表明，阻塞误差也很大程度上归因于模式的大尺度气候偏差。此外，中等分辨率模型可以包含足够的可变性，如果它们经过校正以考虑时间平均偏差，则可以大大提高阻塞频率。在这里，我们展示了在一个耦合的海洋-大气气候模式中对大西洋冬季阻塞频率的极大改进的模拟。由于改进了对大西洋的模拟，减少了平均偏差，这是改进的一个关键因素。引文：Scaife， A. A. Copsey， C. Gordon， C. Harris， T. Hinton， S. Keeley， A. O'Neill， M. Roberts和K. Williams(2011)，气候模型中改进的大西洋冬季阻塞，地球物理学。卷。科学通报，38,L23703, doi:10.1029/2011GL049573。
Most climate models underestimate the frequency of Atlantic blocking. Horizontal resolution is often cited as the main culprit due to poorly resolved small-scale variability whose upscale effects help to maintain blocks. However, recent studies show that blocking errors are also largely attributable to the large scale climatological bias of the model. Furthermore, modest resolution models can contain enough variability to generate greatly improved blocking frequency if they are corrected to account for time-mean bias. Here we show greatly improved simulations of Atlantic winter blocking frequency in a coupled ocean-atmosphere climate model. A reduction of the mean bias, due to an improved simulation of the Atlantic Ocean, is a key element of the improvement. Citation: Scaife, A. A., D. Copsey, C. Gordon, C. Harris, T. Hinton, S. Keeley, A. O'Neill, M. Roberts, and K. Williams (2011), Improved Atlantic winter blocking in a climate model, Geophys. Res. Lett., 38, L23703, doi:10.1029/2011GL049573.